Alright, we've been chatting it up in the gas mileage thread about my weirdo fuel delivery problems, so I figured I'd start a new thread to kinda keep the other post on topic. Here are my symptoms thus far:
- Car runs awesome cold. The power I'd expect from the 307 is there and it's pretty responsive for a 200k (I think, the odo says 98k and it's probably rolled once before) mile old ass car.
- Once the car warms up, I get knock when slightly on the throttle.
- Once warm, but not every time it's warm, the car has no power past 1/8 push on the accelerator. If open more than 1/8, the car will actually slow down. It feels like it's choking out on A/F mix, but I can't tell if it's rich or lean.
- At idle, when warm, I hear a slight, fast-pased chirping from the engine compartment somewhere. Possibly a vaccum line or maybe bad EGR?
- Last tank my mileage was around 14.5 MPG. Definitely low for a FWB, right?
- The car seems to run hot. I don't know if that's just 80's emissions and a 195 t-stat doing it or if there's actually a problem. I know the modern cars run hot for fuel efficiency, so I'm probably used to my cold-running 60's and 70's engines.
Now for diagnosis/troubleshooting:
- Replaced the O2 sensor. According to the service manual procedure, the original one from 1987 in my car was dead. I figured it's probably worth the $15 to replace something that should be serviced every 15-30k.
- Checked the EGR. I can press the valve freely with my hands and it will stumble and stall the engine.
- Timing is set, with the diag grounded, to 20* BTDC per the under-hood instructions.
- Idle is set per the under-hood instructions.
- Rebuilt the carb with a kit from Advance auto. I'm no carb master, but I'm pretty sure I got all the parts back where they belong (Q-Jets are complicated when compared to motorcycle carbs!). The plugs are still out since I've been playing with the adjustment screws.
- Set the dwell to run at 30* +/- 5 with the idle air ajustment screw.
- Fiddled with the float stop screw, probably bollocks'd it all up.
- A/F idle mix screws set at default per the rebuild kit directions.
I love driving this car when it's cold, but sometimes when it's warm, I can't even maintain 65mph on the interstate. Forget about trying to go when the A/C is on too, the compressor just pulls the engine to a halt. Sometimes I gotta stand on the pedal just to get the car out of its own way. Help!
- Car runs awesome cold. The power I'd expect from the 307 is there and it's pretty responsive for a 200k (I think, the odo says 98k and it's probably rolled once before) mile old ass car.
- Once the car warms up, I get knock when slightly on the throttle.
- Once warm, but not every time it's warm, the car has no power past 1/8 push on the accelerator. If open more than 1/8, the car will actually slow down. It feels like it's choking out on A/F mix, but I can't tell if it's rich or lean.
- At idle, when warm, I hear a slight, fast-pased chirping from the engine compartment somewhere. Possibly a vaccum line or maybe bad EGR?
- Last tank my mileage was around 14.5 MPG. Definitely low for a FWB, right?
- The car seems to run hot. I don't know if that's just 80's emissions and a 195 t-stat doing it or if there's actually a problem. I know the modern cars run hot for fuel efficiency, so I'm probably used to my cold-running 60's and 70's engines.
Now for diagnosis/troubleshooting:
- Replaced the O2 sensor. According to the service manual procedure, the original one from 1987 in my car was dead. I figured it's probably worth the $15 to replace something that should be serviced every 15-30k.
- Checked the EGR. I can press the valve freely with my hands and it will stumble and stall the engine.
- Timing is set, with the diag grounded, to 20* BTDC per the under-hood instructions.
- Idle is set per the under-hood instructions.
- Rebuilt the carb with a kit from Advance auto. I'm no carb master, but I'm pretty sure I got all the parts back where they belong (Q-Jets are complicated when compared to motorcycle carbs!). The plugs are still out since I've been playing with the adjustment screws.
- Set the dwell to run at 30* +/- 5 with the idle air ajustment screw.
- Fiddled with the float stop screw, probably bollocks'd it all up.
- A/F idle mix screws set at default per the rebuild kit directions.
I love driving this car when it's cold, but sometimes when it's warm, I can't even maintain 65mph on the interstate. Forget about trying to go when the A/C is on too, the compressor just pulls the engine to a halt. Sometimes I gotta stand on the pedal just to get the car out of its own way. Help!