|
|
|
|
| Author |
|
|
Registered
Join Date: Feb 2006
Location: Gaithersburg, MD
Posts: 23
|
Help with diagnosing high revving engine on start.
I turned the key to start the engine on my 1984 911 Targa early this morning and the engine revved as if I had the accelerator pedal floored. I wasn’t expecting that result, so it took me a close to a second before I turned the engine off. I then reached down to the gas pedal to see if there was a problem I could solve by pulling on the cable and then started the engine again but this time I was ready to turn the engine off immediately. There was the same high revving issue, so I shut it down ASAP and went to plan B – taking the other car.
Any suggestions as to what to look at this evening?
__________________
Chip 1984 911 Targa |
||
09-10-2010, 05:34 AM
|
|
|
Get off my lawn!
|
The throttle return spring & cruise control cable. With the engine off, see if they have a range of motion and return to normal.
__________________
Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
||
|
09-10-2010, 05:54 AM
|
|
|
Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,335
|
does it have a "real" idle control valve, as opposed to the cis cars. if so, it may be either stuck open or bad or not getting a signal. some ICV's default to the wide open position, not sure about yours. look for a big air leak too.
__________________
86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
||
|
09-10-2010, 09:43 AM
|
|
|
abides.
|
I'd check the cruise control cable, like Glen said. A bad ICV or a vacuum leak won't make it rev like that.
__________________
Graham 1984 Carrera Targa |
||
|
09-10-2010, 10:48 AM
|
|
Carrera
1984 Porsche Carrera Targa
