07 I have a miss and spark knock I can't get rid of.. need some help!!
08-20-2014, 01:13 AM
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07 I have a miss and spark knock I can't get rid of.. need some help!!
I have an 07 4.2L 5 speed. With NO cel codes.
I have a miss at idle and my rpms on my codes scanners shows the RPMS are anywhere varying back and forth in this range 690 to 850 at idle after the engine is warm.
I also have spark knocking when accelerating.
I have changed air filter, plugs, wires and fuel filter. I have also cleaned the MAF sensor and everything is still just like it was before I changed anything.
Pressure at fuel rail is 40psi
Any suggestion?
Thanks
I have a miss at idle and my rpms on my codes scanners shows the RPMS are anywhere varying back and forth in this range 690 to 850 at idle after the engine is warm.
I also have spark knocking when accelerating.
I have changed air filter, plugs, wires and fuel filter. I have also cleaned the MAF sensor and everything is still just like it was before I changed anything.
Pressure at fuel rail is 40psi
Any suggestion?
Thanks
