Havoch
Proven Member
- 48
- 5
- Apr 15, 2019
-
Mission,
BC_Canada
Hey ya'll, I may have an issue with engine management rather than anything else but could use some help narrowing it down.
Running a 6 bolt block with black top CAS in 1998 spyder. Tuning with ECUFlash and EvoScan. Currently the turbo is upgraded to a big 16g (or is it an Evo3) cant remember haha. Front mount FMIC, 3" exhaust with no CAT. AEM FUel pump with Aeromotive AFPR. Just added FIC 650cc. Running with stock boost and no boost controller, puts me right at 10 PSI. I think that is all the relavent info.
So without fail the engine missfires after 5000-5200 RPM.
I have done the usual
- boost leak check and repair, (still a small leak at TB shaft seals)
- coil pack was suspect so i swapped that.
- Plugs and wires, check! (NGK wires, NGK BPR6EK)
- Connections and vacuum lines, all good there.
- Power transistor, swapped with good one, no results so swapped back
- swapped in the 650 injectors and retuned, same F'n problem
- tried raising timing, lowering timing, leaning out as well as enrichening fuel, no noticeable effect.
Going to do a compression test but don't expect anything out of the ordinary there.
-AFR's are aprox. 10.2 right before the misfire, injector duty cycle is around 50%
and yes.... I have done a search and read old threads. Lots of ideas but not many results.
Thanks.
This is not fuel cut.
Running a 6 bolt block with black top CAS in 1998 spyder. Tuning with ECUFlash and EvoScan. Currently the turbo is upgraded to a big 16g (or is it an Evo3) cant remember haha. Front mount FMIC, 3" exhaust with no CAT. AEM FUel pump with Aeromotive AFPR. Just added FIC 650cc. Running with stock boost and no boost controller, puts me right at 10 PSI. I think that is all the relavent info.
So without fail the engine missfires after 5000-5200 RPM.
I have done the usual
- boost leak check and repair, (still a small leak at TB shaft seals)
- coil pack was suspect so i swapped that.
- Plugs and wires, check! (NGK wires, NGK BPR6EK)
- Connections and vacuum lines, all good there.
- Power transistor, swapped with good one, no results so swapped back
- swapped in the 650 injectors and retuned, same F'n problem
- tried raising timing, lowering timing, leaning out as well as enrichening fuel, no noticeable effect.
Going to do a compression test but don't expect anything out of the ordinary there.
-AFR's are aprox. 10.2 right before the misfire, injector duty cycle is around 50%
and yes.... I have done a search and read old threads. Lots of ideas but not many results.
Thanks.
This is not fuel cut.