Conversions & Hybrids - LS1 swap in Porsche backfire need help
01-23-2010, 11:30 PM
I am wrapping up my LS1 swap into a Porsche 944 Turbo. On the dyno today we are having a backfire at 4500 rpm's.
The car idles & runs well but at 4500 we get the backfire. On the dyno o2 was 12 to 1 at WOT so it shouldn’t be a tuning issue. I was told to check for bad grounds. Any ideas?
01-24-2010, 12:34 AM
Ignition coil breaking down, spark plug wire.
I bet its not a bad distributor cap! :D
01-24-2010, 11:50 AM
Backfire through the exhaust or intake?
01-24-2010, 12:30 PM
What about a bad valve spring? If it is broken near the bottom end it might not present itself until higher rpms.
01-24-2010, 05:30 PM
We installed brand new wires & valve springs.
01-24-2010, 05:38 PM
Maybe you have a bad fuel injector? What about your fuel and timing tables. Something could be goofed up there?
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