Ratty_81
Veteran Member
- Nov 13, 2020
- 378
I was thinking of putting a pertronix module in it with rev limiter.
Random Poor Running/Stalling
- Thread starter Ratty_81
- Start date
Take the carb apart again, blow out the needles and seats good, also here's a little tip I found, that little o-ring on the needle and seat can go bad and cause problems. Also make sure all the bleeds on the main body are free of crud. Seen that many a time, it's it's flooding or running bad from the fuel lever being too high you will see raw fuel coming out of the boosters.
Ratty_81
Veteran Member
- Nov 13, 2020
- 378
That’s the thing though, it runs and idles fine normally. I think I could cruise 2 lane roads for days and never have an issue. Gonna check float level. If that’s ok, I’ll put in my spare GM module and retest.
Ratty_81
Veteran Member
- Nov 13, 2020
- 378
Set float heights, rear a bit high, front a bit low. Same result.
Genuine GM HEI module. Same result.
I can absolutely hammer the car with no problem, then during a spirited freeway on ramp it falls on its face going into third gear.
Next I will replace the coil, but I’m thinking it might be the “smart” fuel pump controller I installed. When it runs like crap and dies, it starts running fine immediately after I refire it. This to me means it’s not heat or carb related. Something is getting re-booted, and that just leaves the fuel pump controller. Nothing else in the car has any brains.
I need to come up with remote fuel pressure gauge to confirm.
Genuine GM HEI module. Same result.
I can absolutely hammer the car with no problem, then during a spirited freeway on ramp it falls on its face going into third gear.
Next I will replace the coil, but I’m thinking it might be the “smart” fuel pump controller I installed. When it runs like crap and dies, it starts running fine immediately after I refire it. This to me means it’s not heat or carb related. Something is getting re-booted, and that just leaves the fuel pump controller. Nothing else in the car has any brains.
I need to come up with remote fuel pressure gauge to confirm.
Is your car an automatic? Perhaps when it goes into third, the vacuum signal changes? (Just throwing darts here)
Ratty_81
Veteran Member
- Nov 13, 2020
- 378
No, manual.
When it starts running bad, it continues to run bad until I restart the engine. Then runs perfectly fine until it doesn’t. I’m thinking electrical. I still need to swap coils then if no change, I’m gonna hot wire the distributor, then go after the fuel pump controller.
When it starts running bad, it continues to run bad until I restart the engine. Then runs perfectly fine until it doesn’t. I’m thinking electrical. I still need to swap coils then if no change, I’m gonna hot wire the distributor, then go after the fuel pump controller.
Anyone nearby that you can try another carburetor?
Ratty_81
Veteran Member
- Nov 13, 2020
- 378
Nope, lone wolf.
To bad you are not close to me....I have carbs for you try...many of them.
Question, what does your fuel pressure or AFR gauge do when you have this problem??
Ratty_81
Veteran Member
- Nov 13, 2020
- 378
Appreciate that. No AFR. I need to get a hose and fittings to temporarily mount my FP gage where I can see it.
Guy I bought the car from said he was having the same trouble, but when I got the car the fuel pressure was set to 4psi. Under hard acceleration it was draining the fuel bowls. I’m at 6psi now and it can run great for one WOT run, then stumble and die while steady state cruising or 3/4 WOT runs so I don’t think it’s a fuel pressure setting issue. Maybe the pump is cutting out due to the controller. Just restarting the engine ”clears the fault“ and it runs fine again.
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