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09-23-2024, 05:17 PM | #1 |
driving is in my blood
Join Date: Dec 1999
Location: Mesa AZ
Posts: 5,748
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What would you check next? Missfire on my 98
I'm having a problem with a cylinder 7 missfire. It only happens when I've been accelerating mildly for a long time, like an uphill freeway ramp to 80mph. Eventually #7 starts missfiring, which gets worse the longer you accelerate. Let off the gas, missfire is gone.
-I started by swapping the plug and wire from another cylinder. -Tested compression. -Then I changed the cap+rotor -Then I replaced the fuel injector. -Finally I plugged in an OBD2 and watched fuel trims while spraying around the intake to cylinder head surface area with carb cleaner. I've eliminated everything that's cylinder 7 specific. Driving around with the OBD plugged in, I can see its only cylinder 7 having any miss fires. I'm at a loss of what to check
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-78 c10 short/step: 388cid, M20, 5/5 drop, lots more. Playtoy and first vehicle. -98 c1500 x-cab: 5.7L, 17" rims, 5/6 drop, flowmaster, helper bags,NBS rear disk brakes. -02 Suburban 4x4: leveled front -CBR600F4i, CBR600RR, CBR1000RR, and standup skis DISCLAIMER: I cant spell for the life of me. |
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