Okay, I'm baffled! I need help.
Here's what happens: When lifting off the accelerator, the TR7 backfires, seemingly through the carbs. The higher up the RPM range I let-off, the louder the backfire. (Going full throttle up to 5000RPMs lets off a good old pop!)
Here's what I know or have found-out.
-The spark plugs look perfect: just a little tan on half the plug...no white deposits or charring.
So it doesn't appear to be a lean condition.
-The temp gauge reads dead in the middle.
-Both Stromberg carbs are new as of '99, which was only 1500 miles ago. They still look new, with clean pistons which move up and down perfectly. I have ATF in the dashpots.
- The hot air return hose (exhaust manifold to carb air box) has totally disintegrated, but all other hoses and emissions parts are seemingly intact and not leaking.
- I tried to reset the bypass valves. removed advance from distributor and plugged it, and idle only went to about 1300RPMS. In following the procedure in the manual for resetting, turning either adjusting screw in couldn't bring the idle past 2000RPMS.
- After adjusting the bypass valves, it seems there's an intermittent pop/backfire at idle. So I must have done something stupid!
- The previous owner filled the gas tank the day I bought the car (10 days ago.) So the gas is new. I have not changed the fuel filter.
Any ideas? Where should I look.
Feel free to ask questions or give suggestions.
Thanks!!!!!
Sam
Here's what happens: When lifting off the accelerator, the TR7 backfires, seemingly through the carbs. The higher up the RPM range I let-off, the louder the backfire. (Going full throttle up to 5000RPMs lets off a good old pop!)
Here's what I know or have found-out.
-The spark plugs look perfect: just a little tan on half the plug...no white deposits or charring.
So it doesn't appear to be a lean condition.
-The temp gauge reads dead in the middle.
-Both Stromberg carbs are new as of '99, which was only 1500 miles ago. They still look new, with clean pistons which move up and down perfectly. I have ATF in the dashpots.
- The hot air return hose (exhaust manifold to carb air box) has totally disintegrated, but all other hoses and emissions parts are seemingly intact and not leaking.
- I tried to reset the bypass valves. removed advance from distributor and plugged it, and idle only went to about 1300RPMS. In following the procedure in the manual for resetting, turning either adjusting screw in couldn't bring the idle past 2000RPMS.
- After adjusting the bypass valves, it seems there's an intermittent pop/backfire at idle. So I must have done something stupid!
- The previous owner filled the gas tank the day I bought the car (10 days ago.) So the gas is new. I have not changed the fuel filter.
Any ideas? Where should I look.
Feel free to ask questions or give suggestions.
Thanks!!!!!
Sam