Question about GMC Sonoma
Numerous Parts replaced already as in: Throttle Positioning sensor, thermostat, fuel pump, fuel pump relay, fuel filter, spark plugs, ignition control module, downstream 02 sensor, a vacuum leak was found and repaired, the air filter is good and the catylic converter is good. It was throwing out the code po179 (low circuit imput) and we replaced the flex fuel sensor and I still have the same issue. I am about at a loss.
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Posted on Jan 02, 2017
SOURCE: 1999 Yukon cold start problems.
1999 Yukon Start Issue - I have replaced the octopuse, battery, fuel filter, fuel pump, still having problems starting in cold weather, sometimes after a heavy rain.
Posted on Dec 08, 2008
Have you checked for spark on all 8 plugs? Unplug the exhaust side coil pack and run the engine. Does it run on all 4 cylinders?
Posted on May 27, 2009
Have you checked the coolant temp sensor. They also have something called a MAP(manifold absolute pressure) sensor that could be causing this issue. This sensor will have a 4 pin connector and 1 vacuum line going to it. Should be on the firewall, just behind the engine.
Posted on Feb 22, 2010
Fuel Pressure Regulator?
Are there any codes/check engine light?
Just off the top of my head.
Posted on Mar 11, 2010
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