4 Attachment(s)
Unknown Misfire 2013 ZL1 408 LSA
Hello all,
My ZL1 appears to misfire / cut fuel consistently, but randomly.
Driving around, throttle at about 30-40%, car will misfire in the range of 2.5k-3k RPMS in 2nd or 3rd gear, AFR spikes to about 20.0, if I hold TPS at the same position, it will continue to misfire if I move it a tiny bit, it goes away, also happens right when letting off clutch and going on gas if throttle is at 30-40%. O2's reading flat, happens at the same RPM in 6th gear too. Fuel pressure seems fine, cannot figure out for the life of me what it is. Been chasing this down for 2 years. Any help is appreciated. See the attached tune file & logs.
Total specs are as follows:
Texas Speed 408
Ported LSA Blower, 2.55/9.06
"In Tank Walbro 450", Keene Bell BAP, SMG Aux Pump, other parts of fuel system are stock
FIC 1300s
Tuned by me
Attachment 144481
Attachment 144482
Attachment 144483
"zl1misfire" see 50 seconds in
"misfire 6th gear 1215" see 12 min 05 seconds in
"zl1 lots of misfires" see 8 min 47 seconds in
Attachment 144487
See attached tune file, happened while tuned on either MAF or SD