CEL: Engine stumbling stuttering and wanting to shut-off
06-25-2019, 03:52 PM
#31
Rennlist Member
Does anyone read between the lines anymore?
06-25-2019, 06:46 PM
#32
Racer
Thread Starter
Unplug the MAF sensor on the airbox and see if the idle changes. Also might consider disconnecting the battery neg terminal for 30 minutes and that will reset the DME/ECU to default base values. When was the last time the TB was cleaned,...and the Idle Control Valve (if you have cable throttle)? Check the clamps on the main air box hose...make sure they are tight.
The TB is pretty clean. However, I can see a film of fuel/oil in the manifold.
I'll take a look at the idle control valve.
All the hoses and clamps are pretty tight.
I was going to suggest unplugging the MAFS. That will help you determine if the MAFS is bad or if the air intake tubes have holes in them.
Then check the Idle Air Control Valve (just had this issue on my BMW 330i)
Then check to see if the alternator might be bad or the belt might have broken.
Then check the coil packs and the connectors.
I hope your timing chain didn't break.
Then check the Idle Air Control Valve (just had this issue on my BMW 330i)
Then check to see if the alternator might be bad or the belt might have broken.
Then check the coil packs and the connectors.
I hope your timing chain didn't break.
I'll follow up regarding the MAF and IAC.
Man, I hope the timing chain didn't break either...
Mike
06-25-2019, 10:25 PM
#33
Racer
Thread Starter
I reset the DME/ECU and started the car. It idled poorly for about 30 seconds and disconnecting the MAF made no difference. I could smell un-burned fuel.
Could these symptoms be a sign of an AOS going bad?
Mike
Could these symptoms be a sign of an AOS going bad?
Mike
06-26-2019, 01:14 PM
#35
Racer
Thread Starter
^^^^
Thank you for the pictures!
I'm somewhat familiar with the vacuum lines after performing the starter, alternator and the starter/alternator cable replacement a couple years ago. I did have the vacuum lines and rubber replaced about a year ago by a local Porsche repair facility.
As suggested I've taken a look at the vacuum lines...not extensively, however, as I haven't removed any parts yet...but they all look attached and in good condition.
Mike
Thank you for the pictures!
I'm somewhat familiar with the vacuum lines after performing the starter, alternator and the starter/alternator cable replacement a couple years ago. I did have the vacuum lines and rubber replaced about a year ago by a local Porsche repair facility.
As suggested I've taken a look at the vacuum lines...not extensively, however, as I haven't removed any parts yet...but they all look attached and in good condition.
Mike
06-26-2019, 04:33 PM
#36
Rennlist Member
Smoke test it.
06-26-2019, 07:32 PM
#38
Rennlist Member
Then you're in good hands, best of luck!
06-26-2019, 08:29 PM
#39
Racer
Thread Starter
^^^^
I'm fast approaching my limits of skill and means to further diagnose the issues I'm experiencing. I think this is the best option, albeit, more expensive.
Regardless, I'll report back with the diagnosis and results.
Mike
I'm fast approaching my limits of skill and means to further diagnose the issues I'm experiencing. I think this is the best option, albeit, more expensive.
Regardless, I'll report back with the diagnosis and results.
Mike
06-30-2019, 05:37 PM
#41
Rennlist Member
I know you want a positive diagnosis of the problem before any major steps are taken, but sometimes a failure just doesn't cooperate with the easy normal diagnostic routines. From reading through the posts I think you have an injector spraying/leaking when it is not suppose to..
06-30-2019, 06:26 PM
#42
Racer
Thread Starter
No, I don't.
I know you want a positive diagnosis of the problem before any major steps are taken, but sometimes a failure just doesn't cooperate with the easy normal diagnostic routines. From reading through the posts I think you have an injector spraying/leaking when it is not suppose to..
I know you want a positive diagnosis of the problem before any major steps are taken, but sometimes a failure just doesn't cooperate with the easy normal diagnostic routines. From reading through the posts I think you have an injector spraying/leaking when it is not suppose to..
Yes, I definitely want a positive diagnosis before proceeding to fix the problem.
I do have an appointment for diagnosis/repair but, I don't take the car in for another week, so it's going to continue to bother me until the car is in the shop, lol.
If it is injectors...do you recommend replacing all six?
Mike
07-01-2019, 01:58 AM
#43
Rennlist Member
Yes, all 6!
07-01-2019, 09:55 AM
#44
Nordschleife Master
With 100% new NOT remans. It has beed talked in depth and even though the remans r tested they may not perform the same under load and these cars need good fuel delivery.
07-01-2019, 11:45 AM
#45
Injectors
I'm all for replacing with new. Want to find out if there is a supplier that offers new injectors for less than $78.03 each. That price doesn't include
O-rings.
Appreciate any replies..
O-rings.
Appreciate any replies..