2019 Pathfinder SV. I have spent over 9k in 12 months and it is still not fixed!!! New fuel pump, gas pedal, pedal sensor, new MAF sensor, new throttle body, new air filter, plugs, coils, fuel injector 3, timing chain, cam sensors, not sure what else I’m missing.
It runs rough, engine light comes and goes, flashes and car goes into protect mode, ABS light, traction control light, all come and go. It may run ok for a day or two, or just a few hours, but then barely goes. It always idles rough.
All the codes are for air/fuel mixture, cylinder 3 misfire, multiple cylinder misfire, camshaft position actuator current/temp high.
Im at a complete loss at this point, and going broke. I’m about to change cam/crank sensors again, and have a person going to do a compression check on cylinder 3. Please help, and advice?!?!?!
A compression check is not a bad idea to make sure you're not dealing with an internal engine problem. As far as all the other parts that were replaced, did the old parts test as being bad? Or was this the parts cannon approach? (The parts cannon rarely produces a good result. It wouldn't be a good idea to simply replace more parts without performing diagnostics first.) Were they at least OEM parts purchased from a trusted source (not Amazon or eBay)?
What were the codes? You can look up the manufacturer's diagnostic procedures at the link below:
If there are codes there is likely freeze-frame data. Has that been checked? What about live data while the problem is occurring?
@chucktobias well, it’s been in to two Nissan dealers, a GMC dealer, a local mechanic, and now I’m YouTubing it myself!
Most of the parts are aftermarket bought on car parts.com. The fuel pump and MAF sensor are OEM, I just bought OEM cam sensors. As far as everything else, I can’t stomach $1,000 for OEM throttle body when aftermarket is $200.
I had a mobile mechanic here with his computer, but all he could say was cylinder 3 was running very lean. I replaced the fuel injector as it looked terrible on the tip. The car seemed better a few days, then it started acting up again.
A friend/mechanic is coming in a week to do the compression check on cylinder 3, but he also mentioned this car is notorious for intake manifold leaks??? I’m thinking of ordering a new gasket for the heck of it. It’s been off and on a dozen times, maybe it’s damaged?
I’ve also seen videos saying ERG valve? And vacuum line leaks or rips? It’s very frustrating at this point 12 months in.
Could it be computer related?
Most of the parts are aftermarket bought on car parts.com. T
That's a problem, particularly with sensors, injectors, and coils. Aftermarket parts frequently don't work properly.
I had a mobile mechanic here with his computer, but all he could say was cylinder 3 was running very lean.
If you're depending on mechanics you need to find one that will properly diagnose the problem instead of throwing parts at it. We still don't know what codes you're seeing but the link I provided will have the factory procedures for diagnosis.
he also mentioned this car is notorious for intake manifold leaks???
Why not test for that as well as vacuum hose leaks and find out if it's a problem? (If none of your mechanics has checked this, which is a very easy thing to do, they're not doing their jobs.)
I’ve also seen videos saying ERG valve?
Most modern cars will throw a code for improper EGR valve operation. If the EGR valve were diverting too much exhaust into the intake I would expect that it would affect all cylinders, not just one. A good mechanic should be able to use a bidirectional scan tool to command the EGR valve to open and close, and check the results.
Could it be computer related?
Is there any reason to believe the ECM or other module is bad?
Overall it just seems that there has been a lot of guessing and parts throwing with little actual diagnosis.
@chucktobias P0300 Random multiple cylinder misfires
P219E cylinder 3 air/fuel ratio
P34C5 A camshaft voltage/temp
It keeps giving the first two, third one is intermittent.
@qcmicrobiology What are the misfire counts for each cylinder? (That would be in live data or possibly freeze-frame data.)
The step-by-step diagnostic procedures for those codes are as follows:
(It appears that lemon-manuals.la is currently experiencing connectivity problems so you may need to try those links again later. I looked up the procedures using my own local copy.)