Question about 2003 Pontiac Montana
Change the spark plugs, then clean out the throttle body and IAC passage (after you removed IAC). Clean the tip of IAC being careful not to get any throttle body spray on anything, except the black tip or you ruined the IAC! By the way, do you have any codes?
Posted on Jan 26, 2015
Hi p0300 is misfire and p0506 is idle control system low check the idle speed sensor take it out and clean it install and try if works P0506 could bring out P0300 do this and check if you don't have to replace the Idle speed sensor good luck
Posted on Sep 04, 2009
These are the definitions for the codes you've listed.
P0300 Random/multiple cylinder misfire detected.
P0506 idle control system rpm lower than expected. I am assuming that the P0506 is happening due to the P0300. If this P0300 was P0301-302-303 etc it would be easier to detect the actual problem. This misfire could be caused by any number of things- bad coils, bad injectors, bad fuel rail, plug wires, ecm...
Posted on Sep 04, 2009
I don't have a solution but I can tell my story on code P0300. What I have replaced so far that did not fix the misfire problems are 1. EGR valve, 2. throttle position sensor, 3. Idol air control valve, 4. The rear crank position sensor, 5. the control module under the coil packs, and 6. the fuel filter. So far it seems to run a little better when I unplug the EGR valve but that is only temporary. I still have the stumbling random misfire but not all the time. It comes and goes. Currently it will run smooth and strong for a while, maybe 10 miles or so, then it just looses power. When I back off the gas it smooths out a bit then as I accelerate again it misfires all over the place with the tach jumping up and down. It will do this sometimes for a few seconds to a few minutes then smooth out and run strong and smooth again. The a mile or so down the road it will misfire again all over again. Sometimes it goes for 30 miles without a misfire at all. I have to question how the cat could cause this issue as mentioned in the list of possible causes.
Posted on Apr 24, 2012
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Posted on Jan 02, 2017
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