I've been reading the forums for a while, but this is my first post. First off, a little background:
1977 FJ40 - I've had it for about 3 months in my buddy's garage
Since I bought this thing, it's been having trouble idling without choking and backfires or "front fires" in the carb (nice fireworks).
Repairs done:
Checked and replaced vacuum hoses.
Replaced distributor and coil/ignitor (w/ reman 1978 models)
Cleaned out Aisan carb and replaced gaskets/acc. plunger
re-adjusted timing
Okay - Now to the latest repair. This weekend, we got on a whole new exhaust (headers to tailpipe - bolt on from Man-a-Fre). With the carb and old manifold off, we once again cleaned out the carb after it looked like one of barrels wasn't getting any gas.
We put the headers, manifold, and carb on and started it w/o the muffler or tailpipe. Loud as hell, but it ran well. Idled smoothly at around 700 and accelerated and decelearted nicely w/o backfire. Excited, we put the rest of the exhaust on. Now it's back to it's old ways: Backfiring and not idling.
My buddy thinks it could be the fuel pump since the bowl doesn't seem to stay full and the only thing (he was told) that exhaust backpressure would affect would be fuel/air mixture. Or does it just need a carb rebuild? I also noticed there is no return fuel line, but the gas cap seems to hold pressure.
Any help would be appreciated?
Please help a newbie. Thanks - Matt
1977 FJ40 - I've had it for about 3 months in my buddy's garage
Since I bought this thing, it's been having trouble idling without choking and backfires or "front fires" in the carb (nice fireworks).
Repairs done:
Checked and replaced vacuum hoses.
Replaced distributor and coil/ignitor (w/ reman 1978 models)
Cleaned out Aisan carb and replaced gaskets/acc. plunger
re-adjusted timing
Okay - Now to the latest repair. This weekend, we got on a whole new exhaust (headers to tailpipe - bolt on from Man-a-Fre). With the carb and old manifold off, we once again cleaned out the carb after it looked like one of barrels wasn't getting any gas.
We put the headers, manifold, and carb on and started it w/o the muffler or tailpipe. Loud as hell, but it ran well. Idled smoothly at around 700 and accelerated and decelearted nicely w/o backfire. Excited, we put the rest of the exhaust on. Now it's back to it's old ways: Backfiring and not idling.
My buddy thinks it could be the fuel pump since the bowl doesn't seem to stay full and the only thing (he was told) that exhaust backpressure would affect would be fuel/air mixture. Or does it just need a carb rebuild? I also noticed there is no return fuel line, but the gas cap seems to hold pressure.
Any help would be appreciated?
Please help a newbie. Thanks - Matt