Idling at an AFR of 20-21, what's the cause?
09-24-2008, 08:47 AM
#21
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?
Reply
0
0
09-24-2008, 08:34 PM
#22
I figured it could have been unburnt fuel, I'm suspecting a faulty injector but I'm sure how to identify which one. The best I could do is swap back in my 1.6 injectors and see if that makes a difference. It's pretty confusing because it runs and sounds completely normal under acceleration and cruise. But I did notice that the idle sound is in fact different now.
Reply
0
0
Thread
Thread Starter
Forum
Replies
Last Post
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
JesseTheNoob
DIY Turbo Discussion
15
09-30-2015 02:44 PM
