In article <28707-43E90A36-923@storefull-3118.bay.webtv.net>,
bobbyswift@webtv.net (bobby swift) wrote:
> May someone here can tell me why my truck backfires when I let off
> quickly on the gas pedal?I'm on my second muffler,it splits them wide
> open.Around town it doesn't do it.It seem to only be when I'm going
> around 55-60mph and let off the gas fast.I replaced the anti backfire
> valve & the smog pump.It doesn't do it with the air pump belt off.Maybe
> somebody can help me figure this out.Thanks! Bobby
The anti-backfire valve operates off of engine vacuum, have you
checked the vacuum lines and solenoids for leaks, correctly
hooked up, proper operation?
If this truck has a juice can vacuum reservoir, that's the first
place I'd look.
