L67 problems

[jpratt]

Last week entering the hwy the car started to stumble and miss pretty bad. Under cruise or easy pedal pressure the car runs great. I have swapped all three coil and the ignition module. It really feels like there is spark loss. Even when the car is missing is still pulls hard under heavy throttle. I am getting no knock and there is no smoke.


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[gn_steve]

I had the exact same problem ended up being injector from cylinder number 2 was dead! Changed my injector abd the car ran great!


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[fast86gn]

Check your plugs and wires. do you have a scan gauge?

 

[jpratt]

I have a scanmaster but no real clue what all the parameters are, there are no DTC stored.

 

[jpratt]

Found it! #5 plug wire would get warm and start to droop and ground out against the header. Installed and old wire I had laying around and zip tied her off and away from the header.
Got out on the on ramp and was at 100 before merging on. Very zippy for a little 3.8 V6. Man I love boost wether turbo or supercharged.


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