LQ4 with a misfire - HELP!
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LQ4 with a misfire - HELP!
I have a 2001 Chevy 2500 ECSB that has a bad miss. Hooked it up to the computer and it says misfire on number 5 cylinder.
So this is what I've done so far:
Installed new spark plug and spark plug wire
Switched coil pack with number 4 cylinder (good spark also)
Switched fuel injector with number 2 cylinder
Compression check - 150 psi all cylinders
Noid light - flashes
Any guesses on what's going on or what to do next?
So this is what I've done so far:
Installed new spark plug and spark plug wire
Switched coil pack with number 4 cylinder (good spark also)
Switched fuel injector with number 2 cylinder
Compression check - 150 psi all cylinders
Noid light - flashes
Any guesses on what's going on or what to do next?
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It doesn't have a broken valve spring.
The truck has 140,000 on the engine.
The cat is interesting. Relatively new exhaust and headers (2 months) on the truck. Kept factory cats.
How do I check backpressure?
The truck has 140,000 on the engine.
The cat is interesting. Relatively new exhaust and headers (2 months) on the truck. Kept factory cats.
How do I check backpressure?
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#9
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run that joker with open headers and see if it fixes it (only long tubes.. dont do this if you have shortys) but if you have shortys.. there pointless...
O2 sensor could be jacked up but usually it will throw a o2 sensor code... i would take the cats out and see if that works...
what about a leaking intake gasket?? could be getting air from there instead of threw the intake....
O2 sensor could be jacked up but usually it will throw a o2 sensor code... i would take the cats out and see if that works...
what about a leaking intake gasket?? could be getting air from there instead of threw the intake....