What Is An IVA, What Is A VVA, and How To Fix Cat IVA Codes.

[@ainsleyrussell167]

Clear, concise and precise. You are a teacher by nature.

[@bensatterfield367]

Army mechanic here, thank god your video was on youtube, this really helped me understand ehat was going wrong with one of our bigger trucks!

[@lynntyler8682]

Just wandering what type of truck 977a4 cutting ass

[@iwishtobetexan6060]

I thought government doesn't have to follow emissions?

[@shaneshane1379]

Go Army ! 😊

[@blackmarkettrucking5821]

Thanks!

[@AdeptApe]

Thank you so much.

[@tsumacity]

I switched from automotive to truck and coach after a decade on the bench. I'm Dealing with flash code 92 today. You know 3x more than all the guys in my shop put together. I'm gonna look like the champ when I crush this tomorrow. Thanks!

[@anthonyscott7223]

I love these videos I have decided that I want to be a diesel mechanic and your videos make me wanna work for cat

[@AdeptApe]

+Anthony Scott Thank you, it's a fun job most of the time and you can make good money doing it.

[@casimirobuenabista]

@@AdeptApe do recommend going to school for diesel mechanic or just start as a lube technician?

[@peglor]

Very interesting - never heard of doing this to reduce NOx before. The high combustion temperature of CI engines is the other part of the reason NOx is a problem with diesel as gasoline engines don't burn as hot (Which is why they have lower efficiency). Plenty of modern gasoline engines are using delayed closing of the intake valves to give a higher expansion ratio than the compression ratio as a means of increasing efficiency, mostly in hybrid cars. It's known as the Atkinson cycle or the Miller cycle (If forced induction) in this context. Being able to turn it on and off on demand allows the engine to make full power when needed (At the expense of higher emissions) but cruise more efficiently, which is where the engine will run for most of its life in a truck.

[@ralphphillips6422]

Your the best I have had some issues with my C-13 and your videos have saved me time and $$$$ Thanks for making this video and presenting it.

[@bucketsamson8314]

Just when I start to think I know something about something you make a video about something I've never heard of in my life haha, good stuff man.

[@AdeptApe]

+Bucketsamson Thank you, just give engineers metal and space and they will find a way to complicate an engine to comply with the EPA regulations.

[@tlucza09]

Great video! Keep it going! Thank you !thank you ! But I have a ongoing flash “ghost” code no one can figure out.Code 95 which I have already replaced! But it’s doing the same low voltage! When truck is shut off, ECM resets! ECM will not retain code so cat can’t find anything wrong!I was hoping maybe you can shed some light on things!

[@SUPATRUKA]

I need you to work on my truck. Many shops I've learned can't be trusted.

[@riosmark458]

YOU sir are the fkn man. Thank you for sharing knowledge

[@cecilmayers3429]

Yes the plug connector tips open up especially the injectors as they have alot of voltage i just squeeze they back close for a tight fit and the engine stops missing

[@SenseiDanX]

ok i just asked about this on the other video, i thought it was an IDA not IVA. I,m a mid level diesel mechanic whos fixed quite a lot of of low to mid level issues but im getting more into breaking apart the engines and getting deeper into the systems

[@cl7510]

Caterpillar is good for having multiple terms for the same thing. Makes learning about and troubleshooting unfamiliar engines more difficult than it needs to be.

[@cecilmayers3429]

As an electrician I realise they do this alot with things so as to confuse ppl ...and so they ensure that only they dealers know these things and bring it to them

[@DoRC]

Oxides of nitrogen. Nitrous oxide is a different thing.

[@richardprofio9549]

Hi I was wondering why no one talks about the up dated iva housings with thicker castings were they bolt to the head to prevent the from breaking and the rocket shafts destroying the head

[@rebelwraith8138]

Oil pressure seems to be low and we have done a lot of checking. When we have the valve covers off there is oil shooting about 15 feet out of the iva housing oil ports.

[@dhillonsavee]

Did you find any solution, I have changed those port orfice.

[@stickrod100]

I have the similar problem how do u fix this

[@joellagpacan9340]

Another very informative video. I will use it when I do an overhead on my JEP and KRA C15s. Since were in this subject, How many miles intervals should I do a overhead? I am doing it every 100,000 miles. Thanks again for all you do.

[@AdeptApe]

+Joel Lagpacan I would say that is a good interval. The first service after major work is done is a good idea too, just to check it. I'll check the Cat interval though. I should do a service interval video with services and everything.

[@richardfish6156]

Can you disable the Iva's? Would there be any advantage in doing so on a LEE C13?

[@edgardoguardado1444]

Thank you so much I'm going to start with the Iva oil pressure sensor. Went to my Peterbilt dealer and they said it was the whole actuator assembly.

[@AdeptApe]

+Edgardo Guardado It is possible to have a leak in the assembly causing that code, but did they troubleshoot it or just try to sell you the part?

[@coaddog]

Great explanation, thanks for the video. My only comment is your reference at the beginning to "Twin Turbos", these are actually Sequential or Series turbos. The other wrong reference that people use is "Compound Turbos" which is something else completely.

[@jesusbenitez1233]

Thank you for answering fast......and then the nex step is checking wiring right.?

[@AdeptApe]

+Jesus Benitez Yep, check the wiring and the connector.

[@esequielmonzon6705]

Great information. Thank you. What can be causing code 2955-5? At start and idle, no codes active. Once I drive, code gets active.

[@christophergonzales8042]

dude you're the shit thanks for the knowledge

[@tomneron2135]

Great video! Is there more than one IVA oil pressure sensor?

[@davidoulton5623]

Glad you said Cat sells soleblnoids separately...i have a 93 for 3 n 4 .this has happened brfore ...going to check plug ends..

[@acdcfanforever3]

Hey Adept, I don't know if you'll be able to answer this on a future video, but I have a 1994 Navistar DT466 engine in my work truck. When I was put in this truck, it ran slow. But the engine was just rebuilt about 1-2 years prior. it still has paint on everything. After awhile the truck would barely make it up hills, so the mechanic at my dairy replaced the fuel filter and it ran great afterwards. It was all full of grease. That was about 2 months ago. Now in the past 3 weeks it has been lacking substantial power. Truck does not want to go from a stop. It has no giddy up. Clutch is good, injectors seem fine, engine runs fine but its just low on power, trucks . Now, it does fly down the highway still at about 75 MPH. I understand you only work on CAT engine but I figured the same principle would apply to about a majority of mechanical diesels. Thanks.

[@AdeptApe]

+acdcfanforever3 I am mostly a Cat guy, but the first thing to check is the fuel pressure. Find out what the spec would be for that engine and get a gauge on the fuel pressure and see what it is doing when it is low on power.

[@acdcfanforever3]

Thank you, l'll check in with one of the mechanics to see if thats what's causing it.

[@cwj9202]

Did you replace the fuel filter again? Seems the fuel tank may require cleaning.

[@acdcfanforever3]

Yeah. Hasn't acted up since. It was full of grease for some reason again. Maybe the driver who had the truck last was fed up with the truck and wanted it off his route so he tried "killing" it. That's really the only way we can get another truck around here. But it's been great for the past several months. Best running truck I've had in my 6 years here.

[@cwj9202]

I think you are on to something about the previous driver.

[@keithparker9027]

Can the Iva/vva be deleted

[@cottonpreppinpoor2709]

3rd trip to the dealership for code 93/94 and it's been the plug every time.

[@dylangoodman558]

I have a iva oil pressure code going off derates power... I've replaced wiring harness from ecm iva oil pressure sense iva solenoid and it's still throwing the same code

[@nealk6387]

kick ass video. thanks for taking the time to make your videos .

[@AdeptApe]

+Neil Neil Thank you.

[@zeke1eod]

Good job as usual, great content and the intro is great dont change a thing!

[@AdeptApe]

+zeke1eod I like the new intro and I'm probably not going to change it for awhile.

[@megalegendario]

hi my name is oscarin ia m from mexico i have problem why cause smock blue we change 6 inyector and seind problem another problen we have hard started we replace twice started ..and continuos smock white

[@2ndMomentumGarage]

What scanner/software do you use or is CAT ET basically the only option to read the computers on the newer CATs?

[@adrianromero4181]

Got any videos on installing a valve cover harness?

[@znafultz1990]

i was wondering how often these go out i have a 06 c15 and have replaced 4 out of 6 in the last year in a half and my truck had a inframe done a year in a half ago 3 said not responding and the 4th said current high wasnt sure if i need to be looking into something other than just replacing the actuators if it might be a bigger problem

[@AdeptApe]

+Zack Fultz Unfortunately they fail somewhat often and are usually the actuator solenoids themselves and not indicative of something else.

[@rickyj2013]

Josh, I have an MXS engine that breaks up/stumbles/white smokes when in cold mode under load when boost pressure is high. No fault codes, IVA system test passed, runs great once warmed up. To me it sounds and feels like either the IVA’s or jakes are activating on their own without being commanded by the ECM…have you seen this? How the heck do I troubleshoot this?

[@Mr.Rebel1776]

I’ve heard of people deleting the iva’s. How would this be accomplished and why? More power?

[@alexpina05]

Adept ape Is there a way to delete or tune out the Iva system ?

[@jaimegarcia4435]

Yes that was going to be my next step.i did see you can put an Allen or her tool.housing don't look crack is there any seals on this ports or are there used for adjustments?

[@AdeptApe]

+Jaime Garcia I'm not exactly sure the port you are talking about as there are a bunch on those housings. I would try to remove the plug and see what is behind it.

[@jamsatsolutions4479]

‼️…. Is it the same One Harness that Controls tue Iva/Fuel Injector⁉️

[@skwlogistics3698]

I'm having an issue with my 2004 BXS c-15 acert. When engine is idle it has a rough idle that comes and goes. Watching the cat id that's on my dashboard, I can go to the screen and watch, when it is running smoothly it shows around 1.1 gallons per hour and when it start running rough it drops to 0.6 gallons per hour. Any ideas?

[@chavinda773]

While changing it out I dropped one of the “shipping” screws inside didn’t see where it went what do you recommend I do

[@turboyamaha9]

c15 getting compression back through the air cleaners is this possible 1 of the iva stuck open aloughing the valve to stay open. have you seen this before. had one of my dump truck go down and taring into it tomorrow

[@JS-sc8nr]

I had similar problem. I had a broken rocker arm

[@roy1531]

I have a 2006 MSX in a Freightliner Columbia with code 92 on cylinder 2. I thought I was just going to change the VVA and harness and my problem would be solved, until I watched your video. How would you suggest checking oil flow and the oil pressure sensor? If the oil pressure sensor is bad would that show up as a different code or can I still have just one actuator not responding?

[@alexsiliv5768]

Hi, you doing great job to make this video thancks. can you tell me the what's the torque on this bolt and the nut on the top of this bolts?

[@XFactor-we5cg]

Great content and detailed as usual!!! Thanks !!!!!

[@mattmoore2463]

I have a code coming up 385-1 coming up cat checked for o ring leaks and put a new solenoid and Iva oil pressure valve and the oil pressure sensor and still has the coed come back

[@jamesh7554]

I think you have it a little wrong on the reason Cat put IVAs on their ACERT engines. Have you ever asked yourself why there is always so much soot in the intake of IVA engines? After all they don't have EGR, so the intake should be clean, right? Well...I have gotten unofficial confirmation that Cat all along have had EGR on their engines via the IVA system. They open the intake valves on the exhaust stroke, which pushs the exhaust gas thru the intake side of the head to another cylinder on the intake stroke. It turns out Cat has had EGR all along, they just refused to admit it. The EGR all happens inside the head via the IVAs.

[@zainpakistan1797]

In stop conditions what is tbe ohms of elecronic fuel injector solenoid coil

[@roywynter9983]

Adept Ape were these engines called 'clean-burn engines'.

[@NoName-tq9fi]

Nitrous Oxide is N2O. The emissions gases at issue are Nitric Oxide, (NO), and Nitrous Dioxide (NO2). Not Nitrous Oxide.

[@jackhuckeba6763]

I have a C13. Happened to notice air bubbles coming up the studs at the top of the IVA housings. Would i have to be getting air in the oil from the pickup tube or is this normal?

[@kohltonadomaitis8718]

If one of these IVA’s stops working will it prevent the engine brakes from working

[@bradcain7059]

Can a bad IVA oil pressure sensor cause the engine to shut down?

[@diegopulecio3795]

What paint markers you use?

[@tsumacity]

orange ones

[@Davidsontransport1226]

385-1 code... Previously had overhead and #1 injector replaced. Immediately after leaving shop I topped full boost and got check engine light so with ET was able to get direct PMI code above. I’ve replaced IVA oil sensor first, checked control valve and seems to be in good working condition. Replaced external wiring harness and internal as well. Only thing that stands out after all this is when removing both sensor and control valve, the oil that comes from housing. It doesn’t continue to pour out before replacing either part but has me wondering if check valve is staying open not allowing pressure to be regulated properly. Wondering if next move should be replace IVA housing or solenoids.... With valve covers off and engine running I’m not noticing unusual oil leaks within the system. Just odd how this happened after replacing a faulty injector and overhead ran. Any thoughts? Thanks!

[@greenmax96]

I have same similar issue. Did you ever find out?

[@Rg-cm3vm]

Hey I just wanna first say your videos are awesome I have a question when I turn the truck on the purge valve intake oil pressure when I turn the truck on it sends oil out of the bridge then stops turns on about three times and then goes off is this normal or should that be sending oil non stop thank you.

[@brooksiechung1686]

Would you recommend changing my twin turbo to a single turbo

[@Hitman-ds1ei]

Is there a delete for IVAs for off highway use with out getting codes

[@TheDeal187]

Is oil supposed to shoot out of that Iva base thing?

[@ivankirsanov5927]

hello sir, is there any chance you can share information about the shop you working in ? thank you for informative videos

[@texasfortruthnomsm7279]

I have a question about a c15 that's been Frankensteined sdp lower with a 6nz upper end keeps overheating after about a 1000 miles last person that worked on it cleaned the oil cooler I've been looking for ways to clean it on here but nothing so far

[@jeffderus1668]

Use cooler thermostats

[@jesusbenitez1233]

I have a problem with a c15 twin turbo , the computer show me the problem is actuator no.1......I replace and the problem persist and the check engine light is back. .....I replace cam sensor and crank sensor and nothing. ....can you recommend me something??its a w900 2008

[@AdeptApe]

+Jesus Benitez It could be the wiring to the actuator itself and not necessarily the actuator solenoid. Is the code an electrical fault or a not responding properly code? If it's a not responding you could have a mechanical problem like the IVA setting.

[@brianschoel5041]

I have an 06C15 It has kind of a miss or a flutter on startup for about the 1st 20 minutes not showing any codes what could that be and then it comes out of it and runs fine the rest of the day

[@mikeshultz1007]

Is it possible to remove the entire iva system from a engine and what all is involved?

[@xpkbrz]

Question for you: I bought a Cummins 6.7 RAM Laramie 2500 and what kind of break in was it done at the factory, if so. What can I do?

[@jalielalrekabi3488]

Hello, I have a question for you. Well more of wanted to pick your brain about something. I have a 1998 freight-liner that won’t turn on easily in the morning. I asked around and people told me to change the filters and the check valve and fuel pump and it’s the same problem. If you have anything that can help me out it would be greatly appreciated

[@haiderk3246]

You R great teacher 🙏

[@disgruntledgreasemonkeyy]

What are complaints from a driver when those solenoids cause issues? My driver is saying he has a rough running truck when it's under a load and he's afraid to drive it. The codes I get are for solenoids 1 and 6. 6 has been replaced already.

[@ludoviclebeau2487]

It is possible to remove the vva? Or cancel them?

[@steppefarm3601]

What is the part number for that sensor?

[@heathjude50]

I’m getting “not responding” on 4 5 & 6. It being those 3 cylinders together I was thinking electrical but now you make me think it probably mechanical. Of course it’s gonna be the most expensive fix with this thing 🤦‍♂️

[@jeffderus1668]

Did you find anything I have one with low pressure codes in conjunction with 5 and 6 most often and sometimes 4. Nearly everything new and goes over except ecm

[@delgadoabdel]

Hey Adept Ape, what would happen when a C15 is concerted to single turbo and I get a 385-03 code? Should I just replace the Sensor or does the code come on due to not having the twin turbos?

[@greenmax96]

Keep getting pid285 and spn-2950. Replace both solenoids and problem still there. What should I do next?

[@megan6228]

Okay so how much does it cost to fix the ivy a on the C13I asked a guy in the shop today and he said not too expensive but he didn't give me an answer and your opinion what should I be expecting

[@chromediesel444]

The 379 I drive has bxs c15. My max normal boost pressure is 48 psi (all rpms). For some reason, Im not max at 48, but 35 instead when ever I drive 1700 rp. Normal rpm, it would blow 27 psi. And no codes popping out. Could IVA done this?

[@CarbonPoweredLife]

Did you ever figure this out? What was it?

[@darlenealonzo5564]

Can you remove the IVAs from a C-13? I would love for you to do it on mines

[@MrFastcarmike]

Hey ape I have a funny idle from time to time on my 06 C-15 ACERT, it kinda feels like the engine is rocking the whole truck but it doesn’t do it all the time, what do you think it could be? I changed all the iva actuators, next I’ll be a overhead done….

[@skrapenpennies9947]

Can anybody help please. I have c15 accert with tapping noise. Changed injectors. Ran over head nothing looks broke everything looks perfect. But one of my iva housings has a spray of oil coming out of the little screw that looks like a ball is inside it. The others just weep out but the middle one sprays will this cause a tapping noise.

[@gilsmith3738]

Why do shops charge you for doing an over head when they replace injectors. They have to do this any way right. You remove the rocker shaft and rockers before getting to the injectors.

[@dastan1267]

So, if you have a twin turbo. You will have more problems than a single turbo?

[@Rickasurus_rex]

Hey man, I juts bought a truck with a C15 and the IVA oil feed is capped off and the iva's are backed off have you seen the before??

[@AdeptApe]

+Rickasurus Rex Someone has programmed the ECM to be an engine with no IVAs and has ran it like that. It shouldn't hurt anything running it like that, but it is technically illegal because the IVAs are emissions components.

[@vespachopper]

We do those, except on c13s. Back off screws, cap oil lines and put in reprogrammed c12 ecm. No more issues.

[@jessereed8283]

I'll trade with you any day Rex

[@teejay9944]

That’s what they call a “ De-Cert” to your engine

[@christopherpeters8707]

Let us know how long your head gasket lasted ...need to change to 16:1 ratio to help reduce pressure in head since ivas no longer do it

[@gabryelagowez]

mi estimado amigo quisiera saber si tienes alguna pagina en facebook para poder seguirte conversar veo algunos caterpillar aca

[@rs9230]

Will the IVAs reduce engine power I just changed #2 actuator solenoid and truck was running and pulling find Now check engine light on and it's not getting boost at 20psi on cat15 acert twin turbos

[@AdeptApe]

+Robert Squall An IVA code can cause a derate, which will reduce power and boost. The IVA itself isn't causing it, just the check engine light. Assuming you don't have a miss caused by an IVA sticking open.

[@rs9230]

Adept Ape OK Kool I just change the #2 once again it Rane fine all morning until I just stop now it's back on low boost psi it's always the #2 actuator not sure what going on with it

[@rs9230]

It's running good but no boost it's stay at 20 psi before check engine light flash I was getting 40 to 45 boost psi

[@rs9230]

Would u think I need a overhead adjustment

[@johnwebber7358]

hey thank you for this video I had the bolts break on me and a Jake that broke to just lucky I got it in time and that's all it broke just hope I got it all back together right lol I been running it for 2days now what's the part number for the valve cover housing the one that the the valve cover sit on I need the bottom gasket to it if u would be so kind to help me out with that sir and again thank you

[@AdeptApe]

+john webber You need to part number for the gasket? What is your serial number sir?

[@johnwebber7358]

msx60937

[@justinwhite7326]

Have a C-15 Acert. MXS 45475. It was overhauled roughly 400,000 miles ago. Boost and fuel pressures are great. Runs fine on flat ground hit any kind of hill even empty and it loses speed. I deal with Cummins and Detroit’s. Kinda out of my league when it comes to cat. Any idea’s?

[@justinwhite7326]

Also was told the actuators have been bypassed.

[@joebaeza86]

Im having the same problem , did you ever figure out what it was ?

[@justinwhite7326]

@@joebaeza86 nope. Took it to local cat dealer and all they could find wrong with the engines entire operation were jakes out of adjustment. Still runs like garbage as far as power.

[@thedisneytribe8687]

What to check when this 520193-4 happened and everything else say Voltage below normal

[@donaldregalado9753]

What is difference of gp valve and valve actuator?

[@erichz-rod6539]

Hi Adept Ape, I recently worked on a 2006 C13 that is showing code 283-7 for oil pressure. In your experience what have you seen that usually causes this? Thank you in advance:)

[@rafaelcarmenate7762]

Erich Z-Rod I have the same problem

[@hernancortez1713]

Hi I have a 08 cat c15 and I have this problem intake valve actuator #3 #4 #5 #6 can you help me

[@WhSpRz_366]

Hernan Cortez Did you ever looked into your IVA issues. I'm having a problem with my #5 one

[@jaimegarcia4435]

Question I removed valve cover to check for any leaks on the housing and I do see oil coming from top and bottom port about 3/8 diameter looks like un Allen wrench.is this normal ?.I do get a 93 flash code. C-15 engine

[@AdeptApe]

+Jaime Garcia Without seeing it its hard to say. Check the other housings to compare, if one is leaking and the other isn't, then you have a problem.

[@miguelgomora7296]

I have a code for iva #1 does it hurt engine if i keep running it

[@tm06jre97]

Your videos are great and your passion its well appreciated thru the drivers and mechanics , thank-you for that ! I also have a question if you can help me ...i have a C-15 MXS ,do you know base on your testings how much is the resistivity for the fuel temp sensor (cold and hot engine) ? THX

[@AdeptApe]

+Dan Bulzan Hmmmmm, the ohm reading of the fuel temp sensor, can I have your serial number and I'll try to find out.

[@tm06jre97]

Great, thanks ! MXS42205

[@AdeptApe]

+Dan Bulzan I'll try to look tomorrow, but if I don't reply by Wednesday send me a new comment and I'll remember.

[@AdeptApe]

+Dan Bulzan So I looked it up on Sis and Cat doesn't list the temperatures and ohm readings, it just does the voltage readings when it's disconnected and connected. So I ohmed out the sensor on a C15 we have here and the shop temp was 72 degrees Fahrenheit and it was at 1987 ohms. That is the best I can do.

[@tm06jre97]

Thank-you for looking into it, i did the same reading 1.9k and i notice a big drop in resistivity with temperature increase. Tomorrow im planning to test a step grade switch with different values in resistivity ...hopefully ill get my turbo boost back. I'll let u know. Thank-you again...

[@sagar81399]

Variable valve actuation is used to increase air flow is cylinder not to decrease...and (i kind of feel) the explanation is also wrong (the explanation about working of iva/vva), valve is kept open to allow more air into cylinder (its because of inertia) the pressure inside cylinder will still be negetive even while piston starts moving up due to high rpm (strictly my opinion though)

[@dalestrieter6809]

My check engine light came on and the flash code was My oil pressure sensor voltage high or low. I just got the sensor and will be changing it when I get home in a couple days. This afternoon my engine brake lost cylinders. Can the two things be related?

[@israelruiz8731]

was code a 95? did you get a fix?

[@jacetransport6662]

What happens to your motor when the sensor goes out?on a c15

[@TheFisnikbojku]

Sir what was the part number for the IVA wire replacement

[@TolaTrucking]

pershendetje Fisnik..numri eshte: CAT 366-9748

[@robertsolomone5357]

Hi Adept Just wanted to clarify something. When the IVA keeps the air intake valve open during the time the piston starts moving upwards, which place or port does the nitro oxide gas escapes out of? The exhaust valve would have closed before the intake process started. Thanks Really enjoy watching your videos.

[@bjzq8]

The IVA allows the piston to push some of the air back into the intake manifold. It effectively lowers the compression ratio of the engine, making the mixture burn at a lower temperate and reducing NOX at certain points in the load curve. The NOX itself isn't generated until the mixture burns, and it's pushed out the exhaust. NOX is the biggest emissions problem for almost any diesel, and the hardest to fix.

[@gordolobovelos]

can the iva be deleted ?? by a tune

[@jimmysmith8803]

Have 07 Pete 379 c13 getting code 92 changed both actuators for number 1 and 2 actuators how do I clear code in system unhooked batterys over night hooked up scan truck without starting and code still there any help is appreciated