Popping sound @ Idle when engine cold, any ideas??

[green94droptop]

unit5303:

You've brought up some interesting question I have now since you say my o/r hpipe is causing problems.

Could you explain what open loop and closed loop mean when you were talking about, "Your O2 sensor's don't work when your car is cold, you run in open loop, but my guess is your computer is taking closed loop info and adjusting your open loop cycle."

When I first bought my car, I took it to Moble to get this FISK (fuel injection service cleaner)put into the vacuum lines. I don't know if that did anything. Had an oil change done a 1000 miles ago. Just ran an injector cleaner thought the gas lines at empty tank.

Also still getting poor gas mileage. (225 to the tank). Was it a smart choice to go with a o/r hpipe?

Thanks

P.S. Sorry for steeling the topic jetuomi!

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Green '94 GT conv. -- K&N filter charger, FMS 9mm wires, Accel hipo cap/rotor, 180* thermo, 14* timing, off road H-pipe in front of 2 chamber flow's, and still workin' on the rest!