Little bit worried about my 89 Bonneville LE, engine stutter - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-09-2004, 05:25 PM   #1
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Default Little bit worried about my 89 Bonneville LE, engine stutter

Hey guys,

I'm a little bit worried about my 1989 Bonneville LE engine... I've had it for two days, it'* got 134k miles on it... I notice that when I switch gears, say from Park to Reverse, Neutral to Drive, etc... my RPM'* drop to about 450, makes somewhat of a stuttering noise, and then about 1 second later the RPM'* go back up to about 600-650... What'* going on with my engine? :(
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Old 05-09-2004, 07:07 PM   #2
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It doesn't sound bad to me. I think your "new" car just needs some TLC. Start with a basic "tune-up". It probably hasn't been done in awhile. So go out and get a new set of regular AC-Delco plugs, Air Filter, and Gas Filter. A new set if ignition wires at this time would also be a good idea along with a new O2 sensor. Come back to us after that tell us if that improved your "stuttering" any. Good Luck.
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Old 05-09-2004, 07:40 PM   #3
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Sounds like a gummed up IAC (Idle Air Control) to me. This is the device that controls the idle speed in response to command from the ECM and a dirty one responds slower than a clean one - when really bad can even cause the engine to stall when you come to a stop.

Should be several posts on where to find (essentially under the big hose from the air cleaner box to the throttle plate) and how to clean the IAC, just be sure to put a rag underneath to keep one of the little unobtainable screws from rolling under the manifold when you drop it.
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Old 05-10-2004, 01:02 AM   #4
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Quote:
Originally Posted by padgett
Sounds like a gummed up IAC (Idle Air Control) to me. This is the device that controls the idle speed in response to command from the ECM and a dirty one responds slower than a clean one - when really bad can even cause the engine to stall when you come to a stop.

Should be several posts on where to find (essentially under the big hose from the air cleaner box to the throttle plate) and how to clean the IAC, just be sure to put a rag underneath to keep one of the little unobtainable screws from rolling under the manifold when you drop it.
Agreed.
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Old 05-10-2004, 03:04 AM   #5
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A rag? I had to chase one of those screws LOL. I got wise and used a piece of cardboard but I never thought of a rag
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Old 05-10-2004, 09:32 AM   #6
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Hehe, well regarding the tune up, looks like I'm going to have to be waiting awhile... appears I'm going to be broke for the next month or so.

And regarding the IAC, hopefully that'* something my friend can fix... see I'm going to be honest here... I don't all that much about cars internally... the most technical I can get with them is wiring a stereo... not too hard now isn't it... :/
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Old 05-10-2004, 10:20 AM   #7
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Well if you have some carb cleaner, cleaning the IAC is free. You remove the big air hose, one connector, and two screws (putting a rag under to catch the screw you drop) and it is out.(best on a cold engine).

Clean the IAC gently (do not try to move pintle in or out) and use a rag to clean the black gunk out of the hole in the throttle body the IAC came out of.

If the gasket fragments, I have made one out of a piece of brown paper (grocery bag) before.

Not as easy as an oil filter but a lot less mess.

Reassembe and there you are.
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Old 05-10-2004, 02:12 PM   #8
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I would use throttle body cleaner instead of carb cleaner so that you don't affect any of the sensitive components.
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Old 05-10-2004, 08:16 PM   #9
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How about this ?
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