misfires on 2 cylinders after swap to stock cam
08-28-2005, 12:55 AM
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misfires on 2 cylinders after swap to stock cam Help me!!!!!! Heres what happened. I put a stock cam out of an 02 vette in my 99 TA. Now im getting a misfire in #5 and #7 cylinders. the car is rough as hell!!! ive checked the PR's, springs, rockers....all that and can figure out why its doing that!!!! 
is it the tune? its a full bolt on m6 that used to have a f10 114.
is it the tune? its a full bolt on m6 that used to have a f10 114. 
08-28-2005, 01:03 AM
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You've ensured the connectors to the coils are secure?
How about plug and wire condition?
Test for spark to rule out the plug and wire.
Work back from there.
If that all checks out, you might want to try a compressoin test.
If only 2/8 cylnders are acting up, I'd say it's not the tune.
How about plug and wire condition?
Test for spark to rule out the plug and wire.
Work back from there.
If that all checks out, you might want to try a compressoin test.
If only 2/8 cylnders are acting up, I'd say it's not the tune.
08-28-2005, 01:09 AM
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i changed the plugs and wires and its still doing it. i even pulled everything off after i checked and it missfired again. My guess is its just the cam and my lifters not mating up since ive been running a bigger cam for some time now..but im sure im wrong. Its not a dropped lifter, or a collapsed valve or the timing chain not being lined up. what else could it be?
08-28-2005, 02:25 AM
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Don't know?
Check the pre-load on those cylinders.
Also swap coils, wires, plugs with a known good clyinder.
See if the misfire moves around.
That will tell you whether it's electrical or mechanical
How do you know which cylinders are misfiring? Are you scanning the diag port?
Check the pre-load on those cylinders.
Also swap coils, wires, plugs with a known good clyinder.
See if the misfire moves around.
That will tell you whether it's electrical or mechanical
How do you know which cylinders are misfiring? Are you scanning the diag port?
08-28-2005, 12:29 PM
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i set up my efi to monitor for misfires. i did also swap coil packs. could it be casue of the springs and the fact that they were set to my old cam and not the stock one?
