Quote:
Originally Posted by cawith
I have had the same issue and I'd also done the IPW changes.
Don't know what the popping is, but it doesn't sound very good. Found out that if I revved it to 2500-3000 rpm just once immediately after the engine had turned on, then the popping would not happen. Have you tried that?
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It's just misfire - fuel doesn't ignite consistently at first when everything is cold. Fuel buildup can cause it to ignite back into the intake manifold. In your case it's pretty harmless, it should last only a short while and backfires are minimal, just let it idle it out. In other cases it can be a problem - first thing that comes to mind is the early 80's porsche 911 SC with the CIS fuel injection systems. Intake backfire would split open the airbox!