Misfire and car won't down shift
10-04-2009, 03:47 PM
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Misfire and car won't down shift I have a 99 Z28. The car ran fine until I put headers on it now it won't down shift around the 70 mph mark like it used to. The guy that installed them took the coils and plugs off when he put them on. I have a diablo tuner and it says that I have misfires on all cylinders. Could this just be plugs, plug wires, coils, or something else?
10-04-2009, 03:54 PM
#2
I have a 99 Z28. The car ran fine until I put headers on it now it won't down shift around the 70 mph mark like it used to. The guy that installed them took the coils and plugs off when he put them on. I have a diablo tuner and it says that I have misfires on all cylinders. Could this just be plugs, plug wires, coils, or something else?
Pull the plug wires off completely and reinstall them. You should get one "snap" when you put the plug wire on the spark plug, and two "clicks" when you put the wires on the coils. If they only click onto the coils once, they aren't all the way on.
