Engine will not start when the temp. drops below 30 degrees. Replaced the IAC and the Coolant Temp Sensor. Also have repalced the fuel filter, plugs & ign. wires.
Is it getting fuel then? Is it not firing the plugs? You must eliminate what is working to move on to repair.Is it getting fuel then? Is it not firing the plugs? You must eliminate what is working to move on to repair.
My problem is definitely not related to my battery. However, I agree that it could be fuel supply related (fuel presure = bad fuel punp)My problem is definitely not related to my battery. However, I agree that it could be fuel supply related (fuel presure = bad fuel punp)
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None of this have anything to do with cold start . If plugged fuel filter it would be a problem hot or cold , IAC problem would cause an erratic idle . You need to have your vehicle hooked up to a scan tool that reads sensor data ! A engine coolant temp sensor could be a problem , mass air flow sensor , Solving Cold Start Problems 1999 GMC Jimmy EricTheCarGuy Doesn't matter this is a chevy an you have a kia , internal combustion engine all run on same principle, so rather then just replacing parts take it an have it diagnosed .
how many miles on the engine?
When was the last time the spark plugs where replaced?
what does the coolant temp sensor read when it does not start?
what does the IAT sensor read when it does not start?
does it have spark when it does not start?
what is the fuel pressure at when it does not start?
The difficulty factor of not being there coupled with the absence of a trouble code is high...One possible cause is a defective coolant temperature sensor which is falsely telling the PCM that the temperature is too high...See diagram below location of CTS (coolant temperature sensor) disconnect connector...set ohm meter on X10 scale (you are looking to read 6000 ohms)...place probes on sensor leads not connector...At outdoor temp of 70-80 degrees meter must read about 5400 ohms...If it reads 1100 ohms or less sensor is defective...test two; measure from top of negative battery terminal, with meter set the same, place other lead first on bare metal of fender;READ...Then on bare metal of engine; READ...Both readings must be less than 50 ohms...If meter reads high (1000-2000) ohms you have found the fault...Install braided ground straps from - batt to chassis and block...Let me know the results of these two basic tests...
I don't know anything about these models, but my first guess would be to check the ECT(engine coolant temp) sensor and wiring. Sounds like the ECM thinks the engine is cold all the time. High resistance in the temp sensor circuit will cause a colder then normal reading at the ECM.
IT IS POSSIBLE THAT THE TEMP SENDING UNIT FOR THE ECM IS NOT READING PROPERLY AND NOT TELLING THE ECM ENGINE TEMP CORRECTLEY SO THE ECM IS NOT ENRICHING THE FUEL MIXTURE FOR COLD STARTS
It could be the temp sensor switch. Fuel injected engines (most GM models) use the temp sensor as the choke sensor as well. I had a Buick that did the same thing and replaced temp sensor and worked fine thereafter.
your battery too weak.engine oil viscosity to heavy or thick.water could be in fuel.bad ignition components like plugs + wires rotor and cap if your van has distributor. if you have a 3.3L engine it dont have distributor. stop up fuel filter.leaking fuel injectors .
Chrysler has a bulletin out for a simular condititon that involves replacing the pcm. Heres the bulletin number 18-005-04. This is only 1 possible cause , Fuel pressure, coolant temp sensor, thottle position sensor all can cause like problems. Seeing sensor values and fuel adaptives with a scan tool helps pin point problems.
Is it getting fuel then? Is it not firing the plugs? You must eliminate what is working to move on to repair.
My problem is definitely not related to my battery. However, I agree that it could be fuel supply related (fuel presure = bad fuel punp)
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