I'm reaching my wits' end here, so I'm tossing this out to the big guns. Maybe something will be obvious to somebody out there.
The rig:
- 1978 FJ40
- Original 2F, rebuilt, de-smog'd
- Chevy TBI (AFI)
- OEM dizzy
The issue(s):
Starts up mostly fine when cold - it runs rough for the first block or so, but gets up and going just fine after that. Once warm, it idles rough. But if you give it the gas, it smooths out nicely. Then, once I've been driving it around a while, and it's nice and warm, if I turn it off and come back to it somewhere between 10-60 minutes later (and usually nowhere close to my house), it won't start. Or if it does start, it will stumble a little as it catches. But mostly it doesn't start. It acts like it's carb'd and flooded or has no spark - just cranks and cranks but never starts.
Things I know/have tried:
- No obvious vacuum leaks (though it's entirely possible I just haven't found it yet)
- Spark is good (coil is delivering spark to the dizzy, and it's making it to the plugs)
- Fuel pressure is good (12 PSI, new fuel pump and new pressure regulator diaphragm)
- Injectors are spraying fuel (under all conditions where they should)
- Fresh ECT
- Fresh IAC
- No codes from the ECM
- Fresh coil
- Fresh distributor cap
- Fresh plugs and wires
The rig:
- 1978 FJ40
- Original 2F, rebuilt, de-smog'd
- Chevy TBI (AFI)
- OEM dizzy
The issue(s):
Starts up mostly fine when cold - it runs rough for the first block or so, but gets up and going just fine after that. Once warm, it idles rough. But if you give it the gas, it smooths out nicely. Then, once I've been driving it around a while, and it's nice and warm, if I turn it off and come back to it somewhere between 10-60 minutes later (and usually nowhere close to my house), it won't start. Or if it does start, it will stumble a little as it catches. But mostly it doesn't start. It acts like it's carb'd and flooded or has no spark - just cranks and cranks but never starts.
Things I know/have tried:
- No obvious vacuum leaks (though it's entirely possible I just haven't found it yet)
- Spark is good (coil is delivering spark to the dizzy, and it's making it to the plugs)
- Fuel pressure is good (12 PSI, new fuel pump and new pressure regulator diaphragm)
- Injectors are spraying fuel (under all conditions where they should)
- Fresh ECT
- Fresh IAC
- No codes from the ECM
- Fresh coil
- Fresh distributor cap
- Fresh plugs and wires