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timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

My car has been parked for some time now and it idles too high.

there is barely any gas in the tank reads zero and it idles close to 2000 rpm or over 2000 rpm

it used to idle around 1100-1200 rpm still high but now its way too high.

could it be due to the car not been driven for so long and barely any gas in the tank?
_________________
78 924 sold.
85.5 944

chris24 · Posted: Sat Apr 09, 2005 10:41 pm Post subject:

You could have a look to see if your auxillary air valve is getting power when the engine is on and hence closing, or you could put 12 across it and see if it closes if you took it out i guess. I wonder if the cold start valve could cause it if it was always on, it should only have voltage across it with ignition in 'start' position. I doubt it is going to be due to low fuel.
Chris
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1983 - 924 (185K miles) - not mint
1985 - 924 (148K miles) - mint
1990 - 944S2 cab (52K miles)

timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

can't I just adjust the idle speed. hanyes says you turn the screw on the throtle body to adjust it. I'm not really sure which screw.
_________________
78 924 sold.
85.5 944

Lizard · Posted: Sun Apr 10, 2005 3:49 pm Post subject:

we will discuss this tomorrow tim
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3 928s,

chris24 · Posted: Mon Apr 11, 2005 2:11 am Post subject:

I really doubt it, that should not be the reason it is idling high, there must be something else for it to change from 1100 to 3000. I think you may find out tomorrow!
_________________
1983 - 924 (185K miles) - not mint
1985 - 924 (148K miles) - mint
1990 - 944S2 cab (52K miles)

Lizard · Posted: Mon Apr 11, 2005 6:15 am Post subject:

tim had stated that his CO mix was high and JUST under the limit for aircare, so when I went there today I leaned the mix by about 1/4 turn and that should fix the problem, I forgot how nice the flowmaster sounded on these cars.
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3 928s,

augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

Lizard · Posted: Mon Apr 11, 2005 10:30 am Post subject:

nope it was a 40 series,
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3 928s,

Porscheaddiction · Posted: Sat Apr 16, 2005 3:46 am Post subject:

I now have developed this high idle about 2000 rpm...what could cause this and whts the best way to go about correcting it?
Thanks Chris.
_________________
1981 924 NA (Restoring mode)
1984 928S (Enjoying the driving season)

timstar92404 · Joined: 22 Sep 2004 Posts: 2075 Location: richmond BC

my idle was at 2000 also I think you just adjust the screw on the throttle body.
_________________
78 924 sold.
85.5 944

Porscheaddiction · Posted: Sun Apr 17, 2005 12:05 pm Post subject:

ok I made a mistake, I observed the following...when I 1st start my car it idles at about a 1000rpm after the car warms up my idle increase to about 1500rpm. I tried that throttle body screw its all the way in ...if I back it out it increases the idle. .. All this began when I replaced all my vaccum lines ..any corelation with this perhaps? Is there another way to adjust the idle speed? I saw something about disconecting the idle controll plug and bridging it. then adjusting the idle then plugging in the idle controll plug back in....The idle adjust is that the screw on the throttle body as ur facing the engine?
Thanks.
Chris
_________________
1981 924 NA (Restoring mode)
1984 928S (Enjoying the driving season)

augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey

Porscheaddiction · Posted: Sun Apr 17, 2005 12:23 pm Post subject:

Your talking about the ignition timing right ? via the rotor/distriibutor?..ok I have the specs for the timing..to check/adjust this is a timing light mandatory?
Thanks Chris.
_________________
1981 924 NA (Restoring mode)
1984 928S (Enjoying the driving season)

Porscheaddiction · Posted: Tue Apr 19, 2005 12:33 am Post subject:

Ok everything I have read says the idle has to be adjusted before checking the timing? How is the idle adjusted ?? haynes is kind of vague What I can make out is the EIS module has to be unpluged then the idle speed can be adjusted...Where is the idle speed adjustment? is that the bypass screw on the throttle body itself?

Thanks.
_________________
1981 924 NA (Restoring mode)
1984 928S (Enjoying the driving season)

augidog · Joined: 03 Mar 2003 Posts: 1360 Location: New Jersey