hard cold start runns ruff need help

SERIOUS JUJU

Registered User
I have a 91 S/C has a bad cold start problem, i have changed the idle air controler and it starts now but wont stay running and wants to " hunt" for fuel.

It seems to be over fueling also

Any Ideas

Thanks
:confused:
 
Not sure what overfueling is referring to but I would look at changing the ECT sensor. If it is not sensing correctly the cold temps you may not be into cold start strategy on the EEC (essentially an electronic choke). If it is essentially not reacting to temperature changes correctly it can affect what fuel table is selected for use in the computer and mess up your expected mileage. The sensor is a semiconductor thermister and unless it opens entirely may not set a hard code and give you a Check Engine light.
 
The cars check engine light now comes on with the new idle air controler
where is the cold air sensor located I wil try and change that
 
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