I searched around for a similar issue with no luck so heres the problem. Whenever I build boost and let off the throttle im getting excessive backfiring never physically heard it this bad before. Then when i continue to drive normal it will do it whenever I let off boost or no boost.I adjusted my AFPR to lean it out a bit since I was getting system to rich code but still nothing. Any advice would be appreciated thanks.
When I completely let off it should read 22.4 and when it does it wont back fire, but when its backfiring its reading like 20, 21
your wideband reads 22:1 AFR?
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
When im fully off the gas yeah..
When cruising than letting off the throttle theres a lean curve so it should go that lean breifly. check your plugs?
How rich are you in boost? If you're spewing raw fuel past the turbo, that's proably your backfiring when you let off the gas.
About high 10s, havent had the time to adjust that yet ill do it today and try that. That sounds like the issue.
When I drove it this morning it immediately backfired when letting off no boost at all, so unless there's still fuel past the turbo which I can see that's possible then im not sure.
Mine did this real bad for a time frame. I also had spark blow out at high boost. I gaped my plugs down to hardley anything and put them all in so that the little curve park on all 4 faces the intake. Seem to fix both my blow out and my loud poping. What is your gap?
my gap is 37 i think, i fixed the problem though, my turbo was being held on by 1 bolt and it was loose.. so i guess that will cause serve backfire lol thanks guys
