Car is a 94.. It had run fine, and on my last run at the track , while stalling the converter it started to backfire....
The car idles the same as it did befor. It cruises fine, It can rev up in P or N fine..Stall it against the converter and it breaks up and backfires.
what I'v checked:
cam sensor was changed less then a week befor the track day.
I changed my plugs ( which were like 3 days old ) to new ones gapped @ .035
Ohmed out plug wires and they have the same resistance as a new wire.
I thought maybe because i used leaded gas it may have killed my o2's, so i replaced them.. they were old anyways... - reset battery
changed tune to one with knock sensor off
Held rpms at 3000 in N and then gassed it hard and no backfires which i think would tell me its not a fuel delivery problem.. Pressure is at 42ish lbs at idle..
No detectable movement in the balancer..
the only idea i have left is to drop the exhaust and run it to see if the cats are shot..
The car idles the same as it did befor. It cruises fine, It can rev up in P or N fine..Stall it against the converter and it breaks up and backfires.
what I'v checked:
cam sensor was changed less then a week befor the track day.
I changed my plugs ( which were like 3 days old ) to new ones gapped @ .035
Ohmed out plug wires and they have the same resistance as a new wire.
I thought maybe because i used leaded gas it may have killed my o2's, so i replaced them.. they were old anyways... - reset battery
changed tune to one with knock sensor off
Held rpms at 3000 in N and then gassed it hard and no backfires which i think would tell me its not a fuel delivery problem.. Pressure is at 42ish lbs at idle..
No detectable movement in the balancer..
the only idea i have left is to drop the exhaust and run it to see if the cats are shot..