nor Indy or dealership could fix it I need you guys help!!!
04-26-2017, 03:32 PM
#61
Rennlist Member
06-21-2017, 10:31 AM
#62
Racer
Thread Starter
well is back so far the car has been to a total of 3 indys and 2 certifies Porsche dealerships and still nothing, everything that everyone has said its been done, coils, injectors, sparkplugs, leak check, compression test... etc etc im going crazy!!!!!!
06-21-2017, 11:53 AM
#66
Rennlist Member
Intermittent electric issues in cars are most often caused by bad grounds. I'd guess this injectors ground wire isn't all that great. I'd check the injector harness really well and engine grounds, and injector control module or ECU grounds depending on where the injector module is located. Seat heater could be a ground too.
European cars just tend to have more ground issues than US built autos too. I thought only Europeans put modules in weird places too then I bought my first Corvette.... My Corvette that is 26 years old is having lots of electrical gremlins too. I've rebuild the instrument display, now I'm going to rebuild the A/C control module and replace the IC chip for the tachometer soon too. As cars age wiring and grounds become less effective through weathering, wear and vibration.
European cars just tend to have more ground issues than US built autos too. I thought only Europeans put modules in weird places too then I bought my first Corvette.... My Corvette that is 26 years old is having lots of electrical gremlins too. I've rebuild the instrument display, now I'm going to rebuild the A/C control module and replace the IC chip for the tachometer soon too. As cars age wiring and grounds become less effective through weathering, wear and vibration.
06-22-2017, 12:27 PM
#68
Rennlist Member
Ok so here is the story on my 911. I have a 2004 Jahre 40th Ae with 152k miles. The car is great the problems are as follow. Sometimes the car will run PERFECTO no issues at all, pulls hard and drives great,. other times it will only throw a 0302 check engine light, which is a misfire #2 cyl. I have changed the coil and sparkplug, the Indy and the Porsche dealership have both tried to fix this problem, they have done a leak test, compression test, smoke test, im sure they have done every test and nothing, The car will go days, weeks and sometimes months without any issues no CEL's at all. But when The car gets a wild hair in the tail pipe, I will get a CEL 0302 about 5 to 10 times a day but it only happens when im on a dead stop. the car will shake and the CEL light will blink and eventually go solid, if I rev the car pass 2k RPM and leave it there while is blinking the CEL will go away with in 5 seconds. around the same time this issue started my drivers side seat doesn't heat up, the cruise control only works when it feels like, I know those might not have anything to do with it but is worth a shot, If anyone has this issue please I need help. the car have been doing this for 2 yrs now.
Thank you all in advance.
Thank you all in advance.
Let me me see if I can guess your symptoms. The CEL is seemingly random. It will occur as you come back down to idle after going over 3000rpm. The CEL will seemingly clear itself at times and run fine. The dip in the alternator is probably due to momentary loss in RPMs. Also the compression test will come back fine if the lifter is not locked in the high lift position. May even come back ok in the high lift position as well as it will still seal. The problem is that at low RPM in high lift mode the velocity of the intake charge is not ideal and leads to a misfire, computer shuts down the cylinder.
Let it us know if we're right.
06-22-2017, 03:26 PM
#69
Rennlist Member
i am just getting into this thread, but believe AHSAI is on to it. I also had this happen to me. The problem with most Indy's and even dealers is they have not poked their heads into these engines. I had to explain to the Indy how the lifters in these cars work because they are actually counter intuitive, the outer lifter body moves past the inner at low lift and locks together at high lift. I would bet a steak dinner that is your issue.
Let me me see if I can guess your symptoms. The CEL is seemingly random. It will occur as you come back down to idle after going over 3000rpm. The CEL will seemingly clear itself at times and run fine. The dip in the alternator is probably due to momentary loss in RPMs. Also the compression test will come back fine if the lifter is not locked in the high lift position. May even come back ok in the high lift position as well as it will still seal. The problem is that at low RPM in high lift mode the velocity of the intake charge is not ideal and leads to a misfire, computer shuts down the cylinder.
Let it us know if we're right.
Let me me see if I can guess your symptoms. The CEL is seemingly random. It will occur as you come back down to idle after going over 3000rpm. The CEL will seemingly clear itself at times and run fine. The dip in the alternator is probably due to momentary loss in RPMs. Also the compression test will come back fine if the lifter is not locked in the high lift position. May even come back ok in the high lift position as well as it will still seal. The problem is that at low RPM in high lift mode the velocity of the intake charge is not ideal and leads to a misfire, computer shuts down the cylinder.
Let it us know if we're right.
06-23-2017, 10:38 AM
#70
Racer
Thread Starter
I was reading on another thread and someone had the same issue as I did and mentioned about draining 2 qts of oil and replacing them with ATF to loosen up any junk that might be causing this. someone did it and the car has been 400 + miles w/o any symptoms.
06-23-2017, 12:28 PM
#71
Rennlist Member
Do not do that, changing a lifter is relatively simple. Relatively for someone who knows what they are doing. In my case my lifter had mechanically scored and slightly mushroomed to where it mechanically stuck in a high lift position. No snake oil would have fixed it.
06-23-2017, 01:58 PM
#74
Shameful Thread Killer
Rennlist Member
Rennlist Member
No. You haven't put a scope on the offending injector pulse wire and compared to other cyl.
06-26-2017, 10:24 AM
#75
Racer
Thread Starter
