Question about Cars & Trucks
Runs perfect till it warms up then cuts out
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Posted on Jan 02, 2017
Does the Check Engine light come ON when this happens? Whenever the "Check Engine" light comes on, there is always a DTC (Diagnostic Trouble Code) stored in the ECM (Engine Control Module). You'll need an OBDII (On-Board-Diagnostics) scanner to retrieve any codes recorded/set in ECM. Otherwise, guesswork. I have MANY ideas that could send you on a wild goose chase. I strongly suspect EMS (Engine Management System) sensor beginning to malfunction as it warms up. First strong suspicion is the crank position sensor (CKP) - however,usually always sets a DTC (i.e., P0335, P0336). The next suspicion is the Engine Coolant Temperature sensor. The ECM uses this sensor's signal to adjust fuel, timing, engine RPM, etc based on engine temp. If malfunctioning at a particuar point during engine warm up, it could be telling the ECM the temperature is LOWER or HIGHER than it ACTUALLY is, resulting in the ECM to increase fuel (flood it) or give it LESS fuel (starve it). If this malfunction lasts long enough, the ECM will usually set a DTC for that sensor circuit, either a Range/Performance code, or a "LOW Input" or "HIGH Input" code.
Posted on Jun 07, 2009
SOURCE: erratic idoling when warm
sounds like the air idle valve , if you can get hold of valve to test, try this find valve on inlet manifold and pull hose off going to throttle body,reconect hose to new valve so valves are i line to each other, start car and let it idle for a few moments till the fast idle slows down, then disconnect the wirering goint to the original aiv and connect to the new one , hopefully the original one would have been diconnected in the open position , reconnect wirering to the new valve and turn engine off. disconnect battery for 20 seconds . recon battery and turn ignition on, pump gas pedel 5 times to reset . start engine and let it idle for a few moments ,then try to turn steering wheel , engine speed should rise slightly due to load from power steering pump and then settle back down 875 1075 rpm.this is what the air idle valve should do. if it doesen't look at wiring goig to aiv might have scuffed through.
Posted on Aug 13, 2009
could be number of problems but often this is caused by valve on the inlet manifold which is electricaly operated and then it allows the gas in but it is also vacumn sensitive so a perished rubber pipe could cause it not to sense the vacumn .best advice without seeing it is to visit a mechanic that is conversant with LPG conversion
Posted on Apr 12, 2010
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