Misfires at higher RPMs
#1
08-14-2014, 08:54 PM
Misfires at higher RPMs
Any troubleshooting ideas?
Fuel pressure is fine. Replaced the usual suspects (distributor cap and rotor, spark plugs, wires, etc.). Cleaned MAF/MAP/IAT etc. sensors.
Still getting some roughness at 1500+ RPM - seems to idle fine.
Hooked up my scantool and everything looks to be within range, except I'm not sure about SPARKADV. It is 14-16 degrees at idle and jumps to 40-44 degrees under load. I am not sure what the normal range should be.
Any thoughts? Anything else I should be checking?
Fuel pressure is fine. Replaced the usual suspects (distributor cap and rotor, spark plugs, wires, etc.). Cleaned MAF/MAP/IAT etc. sensors.
Still getting some roughness at 1500+ RPM - seems to idle fine.
Hooked up my scantool and everything looks to be within range, except I'm not sure about SPARKADV. It is 14-16 degrees at idle and jumps to 40-44 degrees under load. I am not sure what the normal range should be.
Any thoughts? Anything else I should be checking?
#3
08-15-2014, 11:54 AM
Just because you cleaned the MAF doesn't mean it's good. It might be worthwhile to try finding another MAF sensor at a junkyard to swap it out. Or if you know anyone with another blazer or S10, see if they'd let you try theirs just to eliminate it for sure.
I cleaned my MAF too but it didn't help, swapped it out with a different one and runs fine now.
I cleaned my MAF too but it didn't help, swapped it out with a different one and runs fine now.
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