Hi,
A couple of weeks ago my 1991 Eagle Talon ESI (no turbo) developed a pretty bad stumble across the RPM range. So far I haven't had any luck trying to troubleshoot it...
Here is what I have tried so far:
- New plugs (old ones were pretty "worn")
- New fuel filter (had been a few years)
- Compression looks great (180 Psi on all cylinders)
- Checked the impedence of the plug wires and tried moving them around
- they appear to be fine (no change to the car's stumbling while moving the wires and impedence was good)
- Checked the impedence of the throttle position sensor (TPS) across its range - nice and smooth, no jumps
- Idle switch works (didn't expect that it was bad but it was easy to check)
- Refilled the car with premium gas and added a bottle of injection cleaner (in case of bad gas).
- Timing appears to be fine (around 5 deg BTDC) and no sign of erratic flashing
- Checked the intake hose for cracks, looked for loose vacuum lines (none found)
- Timing belt appeared to be in good condition (no missing teeth) and cams appeared to be aligned
- I tugged and reseated quite a few of the engine bay connectors in case of a loose connection, however there was no change.
What else should I check?
The car had been driving fine up until the day before this problem occured, however I had noticed that it has become reluctant to start in the morning, often stumbling and dying on the first attempt, but normally ok on the 2nd attempt. The only strange thing I observed on the day before was that the car would stumble probably once at around
2,000 RPM, but be fine over it. The following day it stumbled across the entire RPM range.When I changed the fuel filter I expected to get sprayed since I hadn't released the fuel pressure, however there was only a couple of drops that came out when I removed the outlet hose. Could this be an indication that my fuel pressure regulator is bad or is it more likely to be something else? (injector stuck open?)
I thought the apparent lack of fuel pressure might be why the car is now reluctanct to start...
Any advice in troubleshooting this problem would be greatly appreciated!
Thanks,
Greg