Backfire in the Exhaust System. 350 300 hp 4bbl stock Engine has less than 250 miles on rebuild. Restored vehicle sits for a while between runs. Runs well when its running but backfire in the exhaust is a problem I continually fight with after its set for a while. I'm putting Sta-bil in the fuel at the recommended dosage.
Starts, Runs up, then tries to cut off followed by explosion in the exhaust system. Think maybe its the fuel pump? Somewhere else to look? This has been a problem since I bought the car and finished the restoration I've installed a Crane Fireball XP-7000 Ign System, New Wires, New Cap, Cleaned the fuel system, replaced the Carb (with a stock rebuild). At wits end. Condensation in the fuel system?
I've had this issue before and usually after you run a bit and the condensate is pulled through with a good fuel addative like Techron Concentrate Plus and a little bit of rough running it will recover and be OK but not this one.
No probelm with the Corviar Spyder that sits next to it in the garage and gets run at about the same frequency.
Saturday, October 27th, 2012 AT 3:43 PM