On Aug 1, 2:57 pm, Axel Griese <axel-dot-griese-at-yahoo-dot-com>
wrote:
> My '86 with the 2.8 multipoint fuel injection is very unstable for about
> the first 30 seconds or so after startup - The idle pendulums wildly
> between almost stalling and 2000+ RPM. Then after anywhere from 30
seconds
> to a minute or so, it settles down. During this instability, the exhaust
> reeks of partially burned gas.
>
> Only happens when I start the car after it has been sitting for at least
4
> hours. No codes on the OBD-I.
>
> I'm no "expert", but my own best guess is that I probably have one or
more
> fuel injectors and/or cold start valve that are leaking after I shut
off,
> and after 4 hours enough fuel has built up in the cylinder(s) to drive
the
> ECM wild when I start.
>
> Is this a plausible theory ? Or is there something else I should
consider
> before I replace all the injectors and the cold start valve ?
More likely is the IAC, (Idle Air Control), on the throttle body.
Is the seal on the adjusting screw intact or removed?
You might also want to check the ground wires on your engine.
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