Nissan K21engine Intermittent Stalling and No Starts

[@charliehustle2579]

Very technical! I figured it out 10 seconds into the video lol. I work for a former TCM dealer and now a Unicarriers dealer we work on the k21 and k25s all day. Those plastic sensors are the old sensors we usually replace them with the metal barrel type when they go bad.

[@scoto1976]

Do you know the ignition timing in degrees for the k21 engine. Any info would be very much appreciated. Thanks

[@charliehustle2579]

@@scoto1976 I can find out for you tomorrow. One thing to know though is you can't adjust it because there's no distributor in place it's all ignition coils on plug.

[@brayangarcia9605]

@@charliehustle2579 hey bro I need help with a tcm engine is a Nissan h20 but I don't know is it out of time it doesn't start but cranks

[@soptea]

I would nt worry not for a split of a second about compression or timing when an intermittent start occur . Also I must admit that I would miss this deep analysis of camshaft sensor waveform .Excellent video !

[@chuckvoss9344]

Thanks for posting again. Always interesting to watch.

[@luismelero6198]

Very good ! Checking signals with the oscilloscope is very usefull. I have to practice more . Thanks for sharing your videos.

[@АлексейГончар-к5й]

Hello. What kind of oscilloscope do you use when checking the signal from the sensor.

[@forkliftgeek10]

Picoscope

[@АлексейГончар-к5й]

we have a nissan forklift motor k 21. Error E 23 E 31 is constantly displayed on the display. maybe you have encountered this problem, tell me where to start troubleshooting.

[@forkliftgeek10]

Check your electronic throttle control

[@АлексейГончар-к5й]

@@forkliftgeek10 Thanks, figured it out. The problem was in the old wires. If you are interested I can send a photo

[@Shadow-fb4xj]

Great video, learned alot from watching

[@oscardeaquino2374]

Gracias x sus information

[@philippetagara2380]

Tnx for sharing ideas the bad sensor.

[@doosanengineer7659]

Great engine. These will run on just 1 cylinder, I know this to be true as I've done it myself.

[@Blue-Collar-Bible]

You are an excellent technician! I’m hoping you can help. I have a Nissan with the k21 engine. It stalled out one day and wouldn’t start. Next day it started and ran fine. Next day no start and hasn’t started since. We replaced both cam and crank sensors, replaced the vaporizer, and fuel injector. Still won’t start, cranks even and strong but won’t start. Checked for spark and has no spark to all cylinders. Coils have power going to them. Even tried a new coil and no spark. The fuel injector only pulses once so it’s not constantly injecting. We have good compression in all four cylinders. Replace the ECM and still won’t start. What should I check next? Thanks for any help!!! Also, coolant and oil levels are full. Power and ground to the ECM are good. Wire harness to the cam and crank sensors is good.

[@forkliftgeek10]

If you don't have spark then it would be the cam sensor signal. I know you said you replaced the cam sensor but make sure it is OEM (metal case) and not the after market (plastic case).

[@Blue-Collar-Bible]

@@forkliftgeek10Thanks for your reply, we did replace with the metal case OEM cam and crank sensors. Still no spark and no fuel. Fuel pressure to the injector is 5psi, but the injector only pulses one time while cranking. I can’t for the life of me figure out why the ECM is not sending spark to the coils or fuel to the injector?

[@Blue-Collar-Bible]

@@forkliftgeek10 All the fuses and relays are good as well.

[@Blue-Collar-Bible]

@@forkliftgeek10 Do you think it’s possible that the new sensor is bad? You ever had that happen?

[@forkliftgeek10]

@@Blue-Collar-Bible it is a possibility but I always check the signal if it reaching the ECM. Before condemning the sensors.

[@jimfrankzd5510]

Tengo un problema igual

[@walterrueda1950]

Can you give some info on you laptop software or equipment you're using??

[@forkliftgeek10]

Its a picoscope oscilloscope hardware and software

[@Gazavich]

Didn't it bring up a fault code?

[@forkliftgeek10]

No it did not.

[@lifeofderv]

Hey I've recently done a head gasket job on an old nissan h25 engine was previously running but was rough and sputtered sorted the head gasket out I skimmed the head and did the valves and seats new seals the lot come to put it all back together runs and idles lovely gets to about 3/4 revs and starts to die out like it's got no fuel or its missing ive gone back and checked everything the spark plugs are working the plug lines are working the dizzy is doing its thing one thing i have noticed tho is the lpg regulator i assume gets instantly cold which i assume is normal i work on diesel engines I can't get my head around it any ideas just found your KZbin channel

[@forkliftgeek10]

The regulator should not.get cold. Make sure that the coolant lines to the regulator are connected properly.

[@lifeofderv]

@forkliftgeek10 yes all connected as I had them but just gets freezing cold as you can see it freeze the water going into it from the head side is red hot but the regulator is freezing cold is it all run through the engines coolant does the regulator help cool the engine coolant ? When I'm back Monday I'm going to have a look as I suspect either the thermostat has failed and not letting the coolant into the bottom hose of the radiator and isn't letting it rev up high or the regulator pipe is sluged up and not giving enough gas to the carb maybe ?

[@forkliftgeek10]

The coolant actually keeps the lpg from freezing. The lpg is kept liquid inside the tank because it is pressurized. The regulator drops it to about 2 psi in the primary chamber. Because of the sudden drop in pressure the temperature also drops. If coolant is at the correct level in the radiator, and all connections are.correct. then the regulator is probably faulty.

[@lifeofderv]

Could it be an issue of low coolant or a blocked thermostat when it ran it got hot fairly quick fan was running hose at the top was hot but the bottom hose felt cold almost like it had no coolant in the bottom hose would this cause an issue with the running as I say it runs and drives lovely until you get to the top end of the revs and just dies off it won't cut out its just almost goes back to idling speed

[@forkliftgeek10]

That sound like coolant not circulating. The lpg regulator coolant circuit does not wait for the thermostat to open though. It sounds like you have air in the system. Did you bleed the system?

[@workwillfreeyou]

Do forklifts have O.B.2 ?

[@forkliftgeek10]

The nissan K21 with the hitachi controller can be accessed with an OBD2 scanner ( Not all pids are avaialble) manufactured 2007 and above.

[@markkaras3809]

Hey! I've been watching your videos trying to figure out a problem with my K21 Nissan Forklift to no avail. It was used a day prior to it not starting again. I changed out the fuel injector and changed out the crankshaft sensor and it started for 5 seconds and I turned it off. Next time I tried to start it and now it is not starting at all. I changed out the vaporizer as well. Do you know what else it could be? I've seen that you have a video on it possibly being the timing tensioner being worn and skipping the timing. Any help will be appreciated! @forkliftgeek10

[@forkliftgeek10]

A faulty MAF sensor signal could also produce a no start and a faulty cam sensor signal would also produce a no start.

[@markkaras3809]

@@forkliftgeek10 Thank you, just got those two sensors changed out with brand new ones and still nothing! I'm about to be pulling my hair out soon. Now its a New Camshaft Sensor, MAF sensor, Crankshaft Sensor, Fuel Injector, sparkplugs, and vaporizer. It's not throwing any codes either on the dash for whatever reason.

[@forkliftgeek10]

@markkaras3809 ok. Let's start with the basics, does it have spark? Spaek must be able to jump out of coil 3/4 of an inch. If not I'm chasing ignition. Turn off tank, does it start with brake clean into the intake? Does it have an even cranking sound? What is the vacuum when cranking? Must be at least 3 to 5 inches of Hg. Higher that that means there is an intake restriction. Close to 0 vacuum might suggest a vacuum leak or throttle is wide open.