ECM fault?

[David Cooley]

Could need the Throttle body bore and butterflies cleaned...  Seen carbon 
and gunk build up and give an unsteady idle...  If it was port injection, 
I'd say clean the idle air control motor.


At 12:12 PM 11/8/1999 -0500, you wrote:
>Unfortunately no one answered my first post regarding what I think is ECM
>related problem in 5.7 TBI in my 1993 Cadillac Fleetwood.
>The problem is erratic or I would say unstable idle. Looks like ECM is
>leaning the mixture (don't know for sure) causing idle to go below
>comfortable level for 2..3 seconds followed by 2..3 seconds of smooth
>operation.
>I've gone trough repeated sensors and parameters check on the engine during
>the last two years. I am confident that all the sensors working within spec
>and I scoped the output from all of them. Mechanical condition of the engine
>is also good - no noices or knocks, compression tests like new, ignition
>system checked repeatedly and spark plugs replaced, no vaacum leaks. Another
>words the mechanical condition is not at fault. However the output of O2
>sensor at idle is somewhat slow with a period of 2 seconds. I don't know if
>this is normal for that engine.
>Could anyone tell me if you have experienced similar behavior of the engine
>at idle and if you got it corrected. Can it be ECM induced?
>Please, share with me what you can, I have exausted all other sources.

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David Cooley N5XMT Internet: N5XMT at bellsouth.net
Packet: N5XMT at KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
We are Borg... Prepare to be assimilated!
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