|
|
|
|
| Author |
|
|
On Tour
Join Date: Apr 2010
Location: New Mexico
Posts: 1,505
|
88 3.2 stumbling .... Your feed back please
My 88 has picked up a stumble again. Last time it ended up being on the high end of the revs and was a failed TPS unit causing the problem. Now it is stumbling right off throttle. Starts easy idles ok but struggles once you get going. I have started checking some of the usual suspects Head Sensor, AFM, vacuume leaks....
During my exploring looking for the problem I discovered the T shaped fuel line that you can see at the back of the fan is leaking. Im happy to have discovered it now in the safety of my garage although pissed because last year I paid a local shop to put new lines on it for all the warned reasons. A conversation I will need to take up with them... Anyway my question is can this leaking fuel line also be the source of my stumble? It is a small drip at this time and of course has move to the very top of my fix list before anything else. Regards Mike
__________________
- 2018 Cayenne S 958.2 - 1988 Carrera 3.2 Coupe Marine Blue (SOLD) |
||
12-24-2012, 01:22 PM
|
|
|
Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
|
Disconnect the plug on the right side of the throttle body that is suspended by a sheetmetal bracket while the engine is running. Idle should raise. If it doesn't, the ECU thinks the engine is at idle.
|
||
|
12-24-2012, 06:57 PM
|
|
|
On Tour
Join Date: Apr 2010
Location: New Mexico
Posts: 1,505
|
^^^ Thank you will check that. I may have already as I think that was a test I read in the Bentley. Best I remember the idle did not change. Will double check.
Also meant to state that the car is also running lean. Plugs are white.. Mike.
__________________
- 2018 Cayenne S 958.2 - 1988 Carrera 3.2 Coupe Marine Blue (SOLD) |
||
|
12-25-2012, 06:25 AM
|
|
|
Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,141
|
Idle should go to 1800 RPM IIRC when you disconnect. Next is with engine off, you barely crack open throttle back and forth listening for the idle microswitch click.
If it clicks by just barely moving throttle open but doesn't raise idle when plug disconnected, the idle switch must be dead. A simple continuity test on the pins of the switch can determine if faulty too. Last edited by Tippy; 12-25-2012 at 10:32 AM.. |
||
|
12-25-2012, 08:34 AM
|
|
|
Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
|
Quote:
Cheers, Joe |
||
|
12-25-2012, 01:06 PM
|
|
|
On Tour
Join Date: Apr 2010
Location: New Mexico
Posts: 1,505
|
Quote:
regards, Mike
__________________
- 2018 Cayenne S 958.2 - 1988 Carrera 3.2 Coupe Marine Blue (SOLD) |
||
|
12-27-2012, 04:53 AM
|
|
|
