Rx8 low compression cold start hunting stalling.

[@freddyrx8]

the same happened to me I replaced the throttle body and three vacuum solenoids and now it runs perfectly fine

[@jaredpukrop9797]

This one was due to low compression. The engine was replaced and the core was sent in, the engine builder sent pictures and explanations of what was going on with it.

[@BarnsB_23]

There’s a lot to keeping a rotary running good The start up of your Rx8 is like mine but Mine idles just fine I’m at 152k miles I pray my motor keeps going

[@revan2814]

me too! i hit 100000 yesterday and the starts sound scary

[@ShogunAutoworks]

How's it doin. 2 rules. Don't park em up and don't park em cold. And if you're really worried f it throw 2 stroke oil in the gas and do a cat converter delete cause burning oil absolutely will cook catalytic converters.

[@anonymousa2999]

My Mazda Rx8 Has 94k Miles On It. It's A 04 And It Runs Perfectly. If Floods Alot But That's It.

[@revan2814]

Is she still fine? mine does flood too since 100000 kilometers

[@FireicerCooper]

Hu? No this is not low compression symptom. You may have low compression but this is not a symptom of that. This the ECU being unable to to control the AFM, faulty MAF, Lambda sensor, dirty throttle body and or throttle position sensor or even throttle reset. Once the ECU gets a correct armed up reading of the lambda sensor it will attempt to adjust the AFM if something stops that from happening such as a stuck open throttle butterfly it will be struggling to adjust idle. Drop some 2 stroke into your fuel tank, this is after all a puddled 2 stroke rotary engine. This Rotary engine may eat its own engine oil instead of stroke oil but it is just a 2 stroke in a rotary action rather than a piston. Oh and clean the throttle body etc etc...

[@jaredpuk]

Yup did all that. also got a reman engine that fixed it

[@FireicerCooper]

Then it was the SSV dirty or the leaver had too much play on it and when the vacuum pulled up the leaver did not open the valve fully. You have two on this engine, upper and lower, usually it cokes up with dirt and oil which binds and damages the bush at the end of the actuators bar.

[@jaredpuk]

+Fireicer Cooper (f1r31c3r) I cleaned that before installing the reman engine last year, it wasn't very dirty as I steam cleaned the engine a bunch of times before pulling the trigger on a reman. I'm not sure why I have to convince you that is was bad, I exhausted every option before dropping 3,000 on a car I paid 2,500 for. I have pictures somewhere of the engine that came out of this car, it was bad apex seals.

[@FireicerCooper]

Hey i am not saying you are wrong and by no means am i saying that you had other issues. Every engine after 20K miles has compression loss. I am just saying what the ECU is doing to compensate for a fuelling issue hence the hunting. I seen 13b engines with 130k+ miles on them without a rebuild running but my point is that reduced compression is not the only cause of hunting like shown in your video. Stuck or failed apex seals will cause it to sound like a German tank which by all fairness is what you had as a symptom as well. I think what you were experiencing from what you have further added is the unburnt fuel enriching the next rotors combustion cycle if it was an apex seal which cause a rich condition on the later rotors combustion cycle causing the ECU to lean out the mixture making the further cycles needing a richer mixture. My point is that just the point of hunting is not enough of an analysis to call the apex seals. It could be fuelling issue elsewhere for these symptoms as well.

[@jaredpuk]

Here is what the engine builder said about this engine after he bought it back as a core. "core 2 that was probably yours. 1 rotor housing is significantly chrome flaked and also has a mean crack at the L plug hole, so really it is below my standard for reuse although you could build a race/hellraising motor out of it and it would run. the other rotor housing was in slightly better shape with only mild chrome flaking and still some cracking at the L plug hole...I consider that one to be about the lowest condition housing I would consider using in a budget street rebuild. Irons, shaft, and rotors look very nice. In fact the rotors look super clean of carbon so I wonder if you ever did the water injection treatment, seafoam/decarb etc. in the history of the engine? This engine would have been fully rebuildable with just a seal set, main bearings, and rotor housings."

[@dennisgarrett144]

look at your temp gauge is still cold bro so no its not low compression....idle it to 3000 for 20 sec & see what she does

[@TheLemonArmy]

The problem is you're using doritos instead of petrol.

[@jaredpuk]

+Thomas Bate (LemonTom) I don't see any problem with that. LOL

[@TheLemonArmy]

:D

[@silasmcgee3647]

Jared P same

[@RyanDeClue]

Run Marvel Mystery Oil and Lucas or Idemitsu premix. There's a very good chance one of your Apex seals is simply stuck. Get it warm, and redline it several times after the additives are in. Then get it out to drive for a few hours.

[@jaredpuk]

Ryan DeClue I have ran seafoam through this engine after this video and premixed Idemitsu .5 an ounce per gallon of premium It seems to be better just not right. I am coming to the all to common conclusion that the housings/apex seals are bad. Here is the video after kzbin.info/www/bejne/fmGnhHyHi818qc0

[@RyanDeClue]

Jared P Seafoam doesn't do anything. It's been proven on countless videos, with spanking brand new 0 mile engines. That white smoke is ONLY the Seafoam burning. What it WILL do is screw your engine up bad. There is a very very very good chance that the ignition coils are bad. Get the newest "C" code coils from Mazda, or the BHR coils. New plugs and wires too. Go with a full ounce per gallon with the Idimitsu. Major difference. The Marvel Mystery Oil will not only lubricate, but will legitimately clean out carbon and sludge. Cleans your injectors too, almost instantly. I was told the apex seals in my 06 GT were bad. I ran the Idimistsu and Marvel mix through a full tank of V-Power, and did a compression test. Perfect all across the board. Checked your air filter yet? Catalytic converter clogged?

[@RyanDeClue]

Jared P I watched the video. You're starting wayyyy too easily for it to be bad seals.

[@jaredpuk]

Ryan DeClue I've got off the shelf new coils plugs and wires. New air filter and a gutted cat. How much marvel oil do you recommend? I will up the mix of Idimitsu. for sure. Thanks for the reply.

[@jaredpuk]

Ryan DeClue Lets hope so. I'm awaiting your response on the amount to mix I'll try that tonight.

[@chrispaci7006]

I have an RX8 as well, less than 62,000 miles, still runs good but I know its only a matter of time this happens to me as well :(

[@marshalmcbride2753]

Theres a guy who got 300,000 miles on his 2005 mazda manual trans on original engine. Compression the same. Its all about getting the flash, and doing everything possible to keep those seals lubricated.

[@jaredpuk]

What flash?

[@marshalmcbride2753]

Jared P ECM flash.

[@jaredpuk]

Ok, what does the ecu flash change?

[@OTechnology]

More oil into the combustion chamber

[@mariosk3255]

Mine works fine cold and hot start! My problem is that mine car will cut off when high rpm,and then will maybe shut down suddenly,most of the times will start at 1st try but sometimes it wont start if i dont let it for 1-2 min to 'rest'... Im loosing years after i bought it 😰😰🤯 (has not a problem at hot start,only if that thing happens that cut the gas down on 7k rpm+engine check:off)Mine will be 950rpm standar on N even if u let it there gas out! I know bad english,sorry 🤷

[@jaredpukrop9797]

I'd check the fuel pump out. High rpm will be the highest load on the fuel system and fuel pumps can come back to life after sitting for a little.

[@rx4mandude]

Seals seem ok have you compression tested it ?

[@jaredpukrop9797]

A reman engine corrected this issue. I drove the car for years then sold it.

[@sharkhansk9340]

My car when cool is starting problem after that 7 self that's start you now any problem?? I,m in tenshion plzzz reply

[@chrisjoshua5463]

Because I see everyone going through a tough time with these cars,so I'm kinda scared to get one now lol

[@Cupat1]

Don't blame you they're shit that nobody wants because of the engines

[@BarnsB_23]

Just get one bro rotary engines are very fun Don’t bridge port it, Get it semi P Ported better idle better sound less ware on the corner and side seals, You’ll turn peoples head they’ll be like oh woow look a Mazda !:) if it’s your passion rotary engines Go after it don’t be a swapper lmao

[@CloudyMinds1]

Dont trust me dont get one....

[@EtsMeJago]

Great video. Many thanks.

[@chinchy111]

were you going full throttle and bringing it to redline every once in a while?

[@jaredpuk]

+chinchy111 Yes however I bought the car this way so I can not say for the previous owner.

[@nickyfox2977]

ok i have 2 mazda rx8's and my silver 1 does the exact same thing when i fitted the new gear box in my silver 1 i diddnt connect the neutral position sensor on the gear box 2 white conectors and now its does that exact same thing i just havnt got round to dropping the gear box again to reconnect it when u first start the car cold it wont do it coz your engine is injecting extra fuel for the cold start if you push the clutch in does it stop if so i would defintly say neutral sensor if nt then yes its a worse issue lol.

[@jaredpuk]

Nicky Fox I tried depressing the clutch without any change in engine performance. I do not have a CEL. Wouldn't the gearbox sensor throw a code?

[@jefmagnum160]

i just got myself a rotary 04 and it needed a clutch car is doing what you just mentioned i took a look wher the tranny is and i noticed who ever fuck with the clutch already didnt plug nun of those 2 selonoids down there thanks ill make sure ill get that together asap

[@davidclark8131]

coolant sensor sounds like it could be send wrong info try disconnect or put new one in

[@jaredpuk]

Coolant level sensor is a common problem, it does not effect driveablity only an annyoning light on. Mine comes on sometimes then goes away. I have the correct amount of coolant. I check oil and coolant every time I fill the tank, witch is almost three times ever two weeks LOL. TLDR, coolant sensor no biggie.

[@tjadeintyo6221]

Someone’s selling a 2004 same model as you in my town for 1,400 and says it has low compression and won’t start. Pls help me out. Should I buy it???

[@benemeney7336]

Tjadeintyo no way!!

[@benemeney7336]

Tjadeintyo I bought a running rx8 for 500 pounds

[@jpatt1000]

Hey fellow Wisconsinite! I just got my RX-8 last week and I'm having a similar low compression issue. Will yours not start when warm? Mine runs and drives great, but when I shut down I have to wait until I'm three dots or less above the double hashes on the temp gauge before it will restart. (It will also stall at the light if I don't keep about 1000rpms on it.) Does yours do that yet? I just plan on pulling the motor and redoing all the seals. Not too bad of a job, but I have to get a 54 mm socket for the flywheel nut and a torque wrench that goes up to 300 ft lbs to tighten said nut. I knew it was a problem when I bought it, but the price was too low to resist (and it's a lot of fun to drive!)

[@jaredpuk]

+jpatt1000 I ended up swapping the engine for a reman unit from rotary resurrection.

[@jpatt1000]

+Jared P Just curious if he found any damage to the hard parts or if the seals were just carboned up and sticking or just worn. That's really the only thing I nervous about as housings and rotors are expensive! Pulling the motor doesn't seem too difficult as there is plenty of space to work once the air cleaner, battery tray and air pump and bracket are out of the way. The only things that look like they might be tricky are the oil cooler lines. How long did it take you to get it out? (I guess I should ask if you went out the top leaving the gearbox in place, or are you lucky enough to have a lift and just dropped it out the bottom with the gearbox attached?)

[@jaredpuk]

+jpatt1000 Sorry for the very late reply. I don't get on KZbin much. I dropped the trans out the bottom then pulled the engine out the top. I don't think the engine comes out the bottom. It was a slow pace I think it took like 6 hours. I don't remember anymore. Rotary Resurrection has a nice how to on the fourms.

[@Blueturbo6port]

Exact same issue here. Did you ever verify there was a loss of compression and what kind of numbers did you pull from the tester? Was the problem bad enough that you wouldnt drive it conservatively in that state?

[@jaredpuk]

Blueturbo6port I did do a poor man's test it was at 75 pounds on both rotors. I am not driving it now. As it will stall at low RMP's so stop signs are tricky.

[@wilfredogonzalez9091]

Guy use Amsoil signature serie 5/30 my Mazda have 200000k mileage I never blow out never give problem

[@asm101999]

So what's the fix for this, other than replacing the engine?

[@SteveyzTunez]

Low compression can also arise from an excess buildup of carbon in the engine. So the saying a 'Red-line a day keeps the doctor away' Redline your car more often then not, to clear the buildup of carbon.

[@bkfmoto2359]

Turbo

[@jordonregan6430]

Check your idle air control sensor bud it could be caked in carbon. And a 8 dollar bottle of carb cleaner will fix it right up

[@jaredpukrop9797]

I did all the cleaners and tests like that before swapping in a reman engine. In this case it was the engine not a sensor of any type.

[@Dubsakk666]

Did yours surge on cold start up? Misfire at cold start?

[@jaredpuk]

nope ran fine at cold start

[@smartwatcherss5718]

Nice car Bad engine😂

[@edmusick7794]

Motor replacement time.

[@tilemahosberetis4417]

Hey mate, just a question. My bike, cbr 600 rr 2004, is lately stalling in neutral at stops even clutched in and also while riding will lose power for a second or two or will jerk forward sometimes as I deccelerate. Do you have any idea what the issue might be? Thanks

[@Dylant38]

do you still have your old engine, ill pay for shipping if you wont to sell it?

[@krisrhebergen]

This is exactly what my vehicle did with a bad throttle position sensor.

[@isaiah7617]

Hey man. Did you get a code for that?

[@mahammadshahbazjr9808]

check fuel and air metering sensor. why is check engine light on???

[@jaredpuk]

it was low compression, replaced engine, it's all good now.

[@StormchaserNickGorman]

How much did it cost for a new engine??

[@jaredpukrop5650]

$3,229.00 before core credit.

[@chrisjoshua5463]

Hey man what's up how's the car? I'm actually about to buy one in two weeks please let me know if it's a good idea because I would be terrified if the same problems occur.. Thanks

[@jaredpuk]

It's an awesome car. I really enjoy driving it. Just get a compression test done on it. I have a rotary specific tester I rent out.

[@jaredpuk]

What is your friend using for fuel management? How is he keeping the ecu happy for the rest of the cars functions? There are so many things to consider when swapping engines in the RX8. I am sure the 2jz swap is much more expensive than replacing with oem. Your comment is not helpful. There are many options out there for engine swaps and just blindly suggesting one is not the best way to do it.

[@jaredpuk]

Alright, we'll skip the engine swap debate. Saying weak suspension is very vague. The rx8 suspension is very good. It is very adjustable right from the factory. It has a very good balance between on track performance and on road comfort. I recently had a blown out shock on my rx8 and swapped in a coil over system for very little money. themazdazoomzoomstore.com/tein-street-basis-coilover-system-mazda-rx-8-se3p-04-11/

[@gunfighterdrummer]

Goodnight Wisconsin!

[@AhmadGalalYT]

Check in your head gasket, it might be blown...Low compression is caused by blown head gasket or a crack in the...whatever they call but, your car is going to start misfiring soon

[@jaredpuk]

+Ahmad Galal Guy this is powered by doritos no head gaskets...

[@AhmadGalalYT]

Jared P Aw, doritos. I'm already eating one lol

[@jaredpuk]

+Hemi Power no need for name calling. It's all cleared up a few comments above.

[@AhmadGalalYT]

Hemi Power Who's the idiot? Would you fuck off?

[@AhmadGalalYT]

Hemi Power Is it all about ISIS? You wanna start talking about gods and prophets? No problem, keep going ahead barking

[@85funnyguy]

Did you get an engine?

[@jaredpuk]

Yes I did . From Rotary Resurrection.

[@brennantria1200]

How much was that ?

[@wza360]

Thanks super useful

[@RedLine_Renesis]

Just don't smack gum man

[@mpclove2]

change your ignition coils

[@jaredpukrop9797]

Reman engine fixed the issue. Later I did upgrade to LS type coils and new spark plugs.

[@dennisgarrett144]

not low compression bro....your rpms are to high to show that.....its your maf or throttle sensor or some other sensor.....its not low compression because your rpms are to high for that

[@edmusick7794]

LMFAO, obviously you know nothing about how a rotary engine works. Worn apex seals operate great at high rpms moron, idling and starting when hot not so much.

[@jaredpukrop9797]

I replaced the engine with a reman unit. It fixed the issue.

[@luismontemayor5713]

I had the same problem and It was the alternator and starter ... and they told me that I had low compression

[@julienh4283]

air leak!

[@Dubsakk666]

It smoked tho huh,

[@jaredpuk]

it does with the fresh motor it smokes. it's the oil injection

[@grahamrees87]

that's why i hate rotary engines. they sound good, rev high, and have a lot of power but they loose compression all the time. that car doesn't even have 80k on it and it needs a new engine. my v8 has 220k and still runs like its brand new

[@jaredpuk]

Graham Rees Cool story.

[@villeinonen]

+Graham Rees My friends RX8 has 210k with the original motor :D He says that he would buy a new one if the current want falls apart, you just don't get the same experience with non-rotaries. E: 130,5k in miles but still

[@JonahLongworth]

I agree they don't last long

[@jaredpuk]

+Jonah Longworth Like a box of chocolates. Never know if your gonna binge eat or not.

[@eduardomontes8456]

I know this post is old but actually rotary scan last very long if you take proper care of them so in reality it's not the engine it's the people that don't know how to take care of them mine has a 125k on the original engine

[@Phanton-Racing]

Bad TPS symptom

[@jaredpukrop9797]

It was a low compression engine. Nothing more

[@CJ-wc6lf]

Once upon a time. Don't buy a Mazda RX8. The End!

[@markflint2629]

Neutral switch

[@jaredpukrop9797]

A rebuilt engine corrected this issue