Th3DooM
10+ Year Contributor
- 301
- 3
- Jan 5, 2011
-
Dresden,
Europe
Hey there,
I have trouble with running lean and misfire for a while now. The car seems to be a bit slower than usual, it feels like something robs power. Stock n/a 420A with Header.
The inspection 2 weeks ago showed me that I`m running lean,Air/Fuel is 16-17.5 @ idle and @ about 2500rpm when warmed up. I had a couple of exhaust leaks BEHIND the catalytic converter that I fixed, the A/F went down to 16.5.
When I push the accelerator hard the car starts to bog for a sec, than accelerates. When I release the accelerator at higher rpms in gear I think I can hear the exhaust stutter. Yesterday it was pretty warm, the coolant gauge was a bit higher than usual. When I backed up I could hear a louder misfire/detonation from the exhaust.
When the car is cold the idle is between 700 and 1000, rising and falling. When it's about 700, the car shakes a little bit, then it goes back to 1000. When warmed up the idle is rock solid at 800.
I changed the fuel filter about 5000 miles ago, checked the ignition system (coils and wires) both visually and with a volt meter and checked the vakuum lines with flammable spray. There seems to be no problem. Unfortunately I can't get my hands on a fuel pressure tester. I have no CEL or other light in the cluster that's illuminated.
I don't know know where I should start fixing the mess.
I have trouble with running lean and misfire for a while now. The car seems to be a bit slower than usual, it feels like something robs power. Stock n/a 420A with Header.
The inspection 2 weeks ago showed me that I`m running lean,Air/Fuel is 16-17.5 @ idle and @ about 2500rpm when warmed up. I had a couple of exhaust leaks BEHIND the catalytic converter that I fixed, the A/F went down to 16.5.
When I push the accelerator hard the car starts to bog for a sec, than accelerates. When I release the accelerator at higher rpms in gear I think I can hear the exhaust stutter. Yesterday it was pretty warm, the coolant gauge was a bit higher than usual. When I backed up I could hear a louder misfire/detonation from the exhaust.
When the car is cold the idle is between 700 and 1000, rising and falling. When it's about 700, the car shakes a little bit, then it goes back to 1000. When warmed up the idle is rock solid at 800.
I changed the fuel filter about 5000 miles ago, checked the ignition system (coils and wires) both visually and with a volt meter and checked the vakuum lines with flammable spray. There seems to be no problem. Unfortunately I can't get my hands on a fuel pressure tester. I have no CEL or other light in the cluster that's illuminated.
I don't know know where I should start fixing the mess.