Rich fuel mixture help needed
Thread Starter
Instructor
Joined: Jul 2002
Posts: 122
Likes: 0
From: Camp Hill Pennsylvania
Rich fuel mixture help needed
Please check my mods.
Having a problem with rich fuel mixture that is causing car to backfire thru exhaust. Car runs good above 55 mph. Sometimes on startup idle is rough; other times idles ok. Started car yesterday and ran ok for about first 3 miles at 40-45 mph. Stopped for traffic light and then notice rough idle. Backfires and pops until I can cruise at 50-55 mph and then cleans itself out and runs fine.
Have replaced both power valves and installed rebuild kit; replaced dist., cap, rotor and replaced with 50,000 volt coil; replaced spark plug wires, am using hot spark plugs.
One other note - replaced ignition module several weeks ago (seems like poroblem began after replacing.)
Any advice would be appreciated)
Having a problem with rich fuel mixture that is causing car to backfire thru exhaust. Car runs good above 55 mph. Sometimes on startup idle is rough; other times idles ok. Started car yesterday and ran ok for about first 3 miles at 40-45 mph. Stopped for traffic light and then notice rough idle. Backfires and pops until I can cruise at 50-55 mph and then cleans itself out and runs fine.
Have replaced both power valves and installed rebuild kit; replaced dist., cap, rotor and replaced with 50,000 volt coil; replaced spark plug wires, am using hot spark plugs.
One other note - replaced ignition module several weeks ago (seems like poroblem began after replacing.)
Any advice would be appreciated)
Drifting
Joined: Jan 2002
Posts: 1,645
Likes: 11
From: Schaumburg IL
Re: Rich fuel mixture help needed (IGTMYKX)
Hook up a vacuum gauge inside the car with a long hose to manifold vac. Then at the speeds where it loads up, what is your cruise vacuum? Maybe the power valves are not correct for what kind of vacuum you are pulling at idle and acceleration to 50, causing them to pore it in. The other is are you over carbed for the engine? Get some other opinions.
