Constantly missing changed plugs and wires, crankshaft position sensor, coil packs, fuel regulator, pcm, fuel pump, fuel injectors. Did a compression test and were good. Number 2 always misses. All other plugs clean and firing. Tons of gas in cylinder 2. Changed fuel injector and plug and still missing/ not firing at all.
If the plug is firing and the compression is good and injector is good I would have to agree on the running compression test
A running compression test needs to be done to see if it has a valve sealing issue . Most garages do a basic cranking compression test . Cranking compression shows good rings sealing but not valve issues .
Possibly wiring harness fault,sesor wheel installed backwards or an even fire/odd fire engine mismatched components
SOURCE: 1999 S10 Pickup miss fire
Your throttle position sensor should be located on the throttle body opposite of where the throttle cable hooks on too. Look for a small black box on the other side with wires leading into a connector. get your codes read and re post them it could be a simple fix.
SOURCE: 1998 Chevy s10 4 cylinder running rough
1- check there is spark come from spark wires
2- check the fire timing by looking for every wire in the right place
3- check there is injector signl
4- check for any vacuom leak
5- try to clean the MAF by brake and parts cleaner
6- try to reset all the code and see what will come after that
SOURCE: 89 Corsica: no power, hesitates in drive, idles
Check your fuel pressure, and or injectors. You may have too much fuel getting into the engine causing it to burn rich and overheat the converters.
SOURCE: 2003 Chevy Venture misfiring
The injector is a good possibility, although you should check for spark in the wire first, as the electrical is the weakest link in the system. Put a spare plug in the end of the wire with the plug resting on metal, then have someone crank the van to see if you have spark that far, test and replace spark plug, (do not get shocked!) then look into a new injector or a good cleaning.
SOURCE: 5.3 L Missing and Rough Idle Intermittently
i have a 2001 chevy z-71 5.3L. I keep getting a random/multiple misfire code for cylinder 1 . I have replaced plugs, wires, coil pack(only on #1 cylinder)., and fuel pump. I still keep getting the cylinder 1 misfire code. I put truck on a scanner and watched the cylinders. # 1 misfires at idle but quickly stops misfiring at around 1000 rpms. you can here the engine miss at idle but truck runs great on road . anyone else ever had this problem?
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