rich spikes
06-27-10, 11:11 PM
#1
rich spikes
I am driving an 89 GXL converted to Turbo with JDM engine. Just rebuilt and streetported with Pineapple porting template. Ported wastegate and running stock turbo. I have a FMIC and a Supra Twin Turbo fuel pump. Monitoring with LC1 for AFR.
Onto the problem...
I have had three times recently under boost, hard on throttle, where I backfired and had what felt like a miss All three times very quick, backfire with hesitation and then immediately back to normal. While cruising home today, AFR was about 14.7 and cruising nicely. I had a quick stutter where the AFR went down to about 11.3 and then right back to high 14s. This was very quick (about as quick as snapping a finger). Not sure what would cause this but it is pretty disconcerting. Any ideas.
Onto the problem...
I have had three times recently under boost, hard on throttle, where I backfired and had what felt like a miss All three times very quick, backfire with hesitation and then immediately back to normal. While cruising home today, AFR was about 14.7 and cruising nicely. I had a quick stutter where the AFR went down to about 11.3 and then right back to high 14s. This was very quick (about as quick as snapping a finger). Not sure what would cause this but it is pretty disconcerting. Any ideas.
06-28-10, 01:21 AM
#2
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Ideas:
Dropout in the air flow meter (AFM)
Intermittent grounded circuit to AFM, one or more injectors, or ?
Intermittent open in the O2 sensor circuit (ECU would interpret as a lean condition, and richen the mixture to 'correct')
Dropout in the air flow meter (AFM)
Intermittent grounded circuit to AFM, one or more injectors, or ?
Intermittent open in the O2 sensor circuit (ECU would interpret as a lean condition, and richen the mixture to 'correct')
Last edited by calpatriot; 06-28-10 at 01:23 AM.
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