Idling at an AFR of 20-21, what's the cause?
#1
Idling at an AFR of 20-21, what's the cause?
Recently I've been getting AFRs of 20-21 at idle. It slowly works its way up from about 15 or so and stops and alternates between 20 and 21. Before I would idle at around 14-15. I'm running a boost setup with the voodoo box but as far as I know that only comes in under boost. Also when I'm driving under cruising conditions I'm getting a pretty steady 14.5-15 AFR and a good 12 under boost. So it just seems my idle AFRs are messed up. What could cause this?
#18
Got some new developments if anyone can make heads or tales of it. Well, after driving for about 20 minutes the AFR will read ~15 at idle pretty consistently. On start up that's different, though, it will hold 15 for a good minute before it starts to climb up to 20.
When driving I've noticed some new sounds coming from the exhaust/engine. It's sort of a grumbling or gargling sound and muffled popping when I let off the gas. It sounds similar to the sounds heavily modified turbo cars make on deceleration with all the backfiring and whatnot. Granted it sounds kind of cool, it's really worrying me. Otherwise the car feels completely normal. The idle MAY sound a little different but that could be me being paranoid.
Also now my boost numbers are around 14 opposed to the desired ~12. Sometimes I can see 12 for a second and it will hold at 10.18 for about 5 seconds then go back to normal reading.
When I get the chance I'm going to check my timing, plugs, wires, and injectors. Not sure where else to look. Could a faulty AFM cause this problem?
When driving I've noticed some new sounds coming from the exhaust/engine. It's sort of a grumbling or gargling sound and muffled popping when I let off the gas. It sounds similar to the sounds heavily modified turbo cars make on deceleration with all the backfiring and whatnot. Granted it sounds kind of cool, it's really worrying me. Otherwise the car feels completely normal. The idle MAY sound a little different but that could be me being paranoid.
Also now my boost numbers are around 14 opposed to the desired ~12. Sometimes I can see 12 for a second and it will hold at 10.18 for about 5 seconds then go back to normal reading.
When I get the chance I'm going to check my timing, plugs, wires, and injectors. Not sure where else to look. Could a faulty AFM cause this problem?