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Surging Idle....(Cold)
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 1,024
Likes: 0
From: Long Island New York
Surging Idle....(Cold)
Hey guys, my 1988 just recently started suffering from a surging idle when cold. It is most pronounced in Park and Neutral, but does still exist when in gear; just harder to feel. It usually idles right at 700-800, but now while cold it will bounce from 800 up to 1100. It is almost non-existant once warmed up, but it can still feel it slightly once warm, just much more pronounced when cold. Any thoughts on where i should look first? The plugs all look good and in about the same condition. Perhaps they haven't been affected yet since this just started happening...I'm also thinking IAC maybe? I also cleaned the throttle blades to no avail; visually checked MAF. Thanks for your time guys!
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 1,024
Likes: 0
From: Long Island New York
Originally Posted by bogus
I tend to think it's the IAC...
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 1,024
Likes: 0
From: Long Island New York
Originally Posted by mikey whipreck
That seems more like a warm Idle issue... When your car is warm does the idle smooth out at all or does it stay the same?
If it smooths out, I would think maybe somethings up with the cold start injector...
If it smooths out, I would think maybe somethings up with the cold start injector...
It does smooth out quite a bit when warm
Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
Originally Posted by Jloshotz
It does smooth out quite a bit when warm
On my '85, it idled steady when it was cold- then when it warmed up I had an idle surge from 600-900rpm's. I replaced the IAC (new one from autozone for 30 bucks), and it cured that problem...
You're problem just doesn't sound like an IAC...
I've been wrong before, so just take this as my opinion...
I wouldn't know how to check a cold start injector anyway...
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Safety Car
Joined: Aug 1999
Posts: 4,931
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From: Fort Lauderdale FL
Originally Posted by Jloshotz
It does smooth out quite a bit when warm
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 1,024
Likes: 0
From: Long Island New York
Originally Posted by 87vette
I've got the same problem as you do. I put in a new IAC and got all new gaskets for the TB and yet the problem is still there.
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Melting Slicks
Joined: Jun 2004
Posts: 3,032
Likes: 4
Originally Posted by 87vette
I've got the same problem as you do. I put in a new IAC and got all new gaskets for the TB and yet the problem is still there.
Do you have a manual? Or can you get a look at one?
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 1,024
Likes: 0
From: Long Island New York
Originally Posted by mikey whipreck
Like I said, I dont think the IAC is your problem...
Do you have a manual? Or can you get a look at one?
Do you have a manual? Or can you get a look at one?
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
I think the cold start injector is right on the plenum. I have a manual for an 87... upon referring to it, the cold start injector is on one of the intake runners, on the back passengers side. At least that's how it kinda looks in the horrible pics!
Thread Starter
Burning Brakes
Joined: Feb 2004
Posts: 1,024
Likes: 0
From: Long Island New York
Bogus,
not sure right now, (car isn't near me) But i think it is located on the left side runner. Does the manual give any troubleshooting tips for the cold start? Maintainance schedule? Thanks for your help!
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not sure right now, (car isn't near me) But i think it is located on the left side runner. Does the manual give any troubleshooting tips for the cold start? Maintainance schedule? Thanks for your help!
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