Having problems with your Chevrolet Caprice ?

My 1993 chevy caprice wont stay started changed pluges wires fuel pump distributer cap and cleaned injectors

Posted / edited by AnonymousUser on : 16-07-2018

Answers :

For the engine to stay running the ECM will need to know how much Air is need,You engine is speed density, There is only 2 places of concern IAC (idle air control) and Map (manifold air pressure). The idle air control is a 4 wire stepper motor, The ECM make changes to maintain desired idle, When this IAC fails the engine management can no longer maintane desired idle and engine stalls. Your going to have inspect the pintle to see if it has the ability to extend to raise RPM and if it can retract to lower RPM. As for the MAP sensor just inspect to see it any of the vacuum hose has fell out or is cut or if you hear a hissing noise, If anything the IAC has failed
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