4 Days Ago | #1 |
Join Date: Oct 2018
Location: Indiana
Posts: 58
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Bringing the Champ back to fighting condition
Ok. I have been driving my 90 Z VIN1965 and it has not been a driven car for 24 years. Not sure the history and why it wasn't driven but for all signs (oil tags, and condition) it not been a sports car for 24 years.
I have a miss that is weird. It only misses when the secondary are on. It seems to only miss when warm. Still trying to confirm warm only miss. Thoughts on what I am chasing. I don't have a scope for LT5 waste space, so I can't tell if it is a cylinder or a bank that is missing. I have not pulled the plugs yet. But it is very intriguing that it does not miss with secondary off. Thoughts? I am a big one for diagnosing then fixing vs just changing plugs and wires especially pulling the intake. Thanks to all my LT5 friends! |
3 Days Ago | #2 |
Join Date: Sep 2008
Location: Speedway, IN
Posts: 131
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Re: Bringing the Champ back to fighting condition
You probably have one or more bad secondary injectors. There is a way detailed in this forum to check them at the ECM harness. If bad, replace them all. The original injectors are not ethanol resistant and short out. About 93 on did not have this problem.
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3 Days Ago | #3 |
Join Date: Sep 2008
Location: Speedway, IN
Posts: 131
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Re: Bringing the Champ back to fighting condition
As I recall you are looking for around 14 ohms resistance.
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1 Day Ago | #4 |
Join Date: Jan 2010
Location: Mystic CT
Posts: 2,625
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Re: Bringing the Champ back to fighting condition
Replace the coils while you're in there....
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5 Hours Ago | #5 |
Join Date: Oct 2018
Location: Indiana
Posts: 58
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Re: Bringing the Champ back to fighting condition
The buyer I purchased it from said injectors had been replaced, but I have no documentation. It really feels like ignition, but it is strange that it will only miss on the secondaries. Just curious if the fuel mixture could be such that it would not miss on primary but miss under a load on secondaries with a full cycle charge needing more voltage. I am thinking maybe wires when the motor get heat soaked. I really like the OEM coils and have run them for a long time with no issues. I have had problems with MSD etc Chinese coils that were new.
Thoughts on wires being the problem? I will replace unless someone scope suggestions. Other injector problems I have had on previous car would have bad misses at idle. This feels like ignition, but so weird it only on secondaries. Anyone have a scope for wasted spark they like for LT5? |
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