89 Low Idle

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Jan 8, 2008 | 09:57 PM

jfreak

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Racer

Joined: Sep 2007

Posts: 292

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From: OR

89 Low Idle

My 89 usually idles between 1000 and 800 RMP, but just a few months ago it started to drop down to 400 RPM, load up and die. It doesn't do it all the time just now and then.

Jan 8, 2008 | 10:06 PM

pkazsr

Le Mans Master

Joined: Jul 2007

Posts: 5,356

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From: No HOA, New Hampshire

Cruise-In X Veteran

St. Jude Donor '09

Fuel pressure then injectors.

Jan 8, 2008 | 10:19 PM

jfreak

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Racer

Joined: Sep 2007

Posts: 292

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From: OR

I don't think it's either one of those because you can really put you foot in it and it doesn't bog down. It usually drops when at a stop sign or while parked.

Jan 8, 2008 | 11:38 PM

SunCr

Le Mans Master

Joined: Dec 2000

Posts: 7,839

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From: San Diego, Ca

Ok - the ECM is commanding a certain # for idle RPM and it isn't keeping up with that (unless someone has reprogrammed it to think that 400 rpms is that number - doubt it!). You might start by scanning it though and if this is happening with the a/c on - turn it off and see if it goes away. Then post whatever scan data you get - it will be far easier to think up something that might fix it with that info.

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