Engine Running Ruff - Help
Thread Starter
Pro
Joined: Sep 2005
Posts: 700
Likes: 0
From: Casa Grande AZ
Engine Running Ruff - Help
My z06 has been running really ruff for awhile and the check engine light came on. Ran the code and it was an intermittent misfire. Mechanic changed the plugs and plug wires and check engine like went out but the exhaust just didn’t sound right. Check engine light came back on, but this time it a was flashing light. Put it back on the scope and ran the code which said that there was not enough air flow on the right bank. The air pump is working and the air flow is fine. The coils are working and the fuel injectors all check out and are working. The left exhaust is dark in color and the right is white. So it seems that the exhaust is restricted on the left side in some way maybe the catalytic converter is blocked? What do you think????? Guess I'll run this in the Tech section as well.
Pro
Joined: Feb 2004
Posts: 657
Likes: 1
From: michigan
My z06 has been running really ruff for awhile and the check engine light came on. Ran the code and it was an intermittent misfire. Mechanic changed the plugs and plug wires and check engine like went out but the exhaust just didn’t sound right. Check engine light came back on, but this time it a was flashing light. Put it back on the scope and ran the code which said that there was not enough air flow on the right bank. The air pump is working and the air flow is fine. The coils are working and the fuel injectors all check out and are working. The left exhaust is dark in color and the right is white. So it seems that the exhaust is restricted on the left side in some way maybe the catalytic converter is blocked? What do you think????? Guess I'll run this in the Tech section as well.
Advanced
Joined: Sep 2006
Posts: 80
Likes: 0
From: Nassau NY
misfire
Had the same problem with my 2000FRC. Replaced the coils (all eight), plug wires, plugs and even the pcm. Finally had it diagnosed and all the electrical was fine. They told me it was mechanical. Removed the left rocker box and noticed the #1 and #7 intake pushrods were MISSING. They were actually broke in half. Was able to fish out the broken halfs and continued to pull all remaining 14 pushrods (both sides). Found another 4 pushrods that were bent. I used VHP pushrods from Ecklers (they are actually Crane 7.400). The write-up in Ecklers even states " cures the problem of misdiagnosed misfireing" and states "stock LS1 pushrods are the weak link". Put all back together and ran my fastest time at the track. My car is back and stronger than ever. Email me if you need more info.
