Breaking up at 5k+, scratching my head.
#1
Breaking up at 5k+, scratching my head.
Hi all,
Currently messing with my brother's 98 GSX. We are running an EVO 8 ecu with 9653 Rom. We have an issue where hitting 5k+ will start to breakup/miss. On or off boost, doesn't matter. I can vary the fuel from 11.1-12.4 with no change.
I have noticed one thing that helps, going lean. Running a 13+ AFR (E85) causes the break up to disappear. Obviously this is too lean to run normally, Is this simply the fuel overpowering the spark?
25PSI on an FP Green, aiming for 30PSI plus.
We have tried:
93 or E85
No Boost leaks
New plug wires,
New plugs (BR8ES @ .022)
New PTU
More timing,
Less timing
Less boost
More boost
Tested the Coil pack
Added Grounds
Changed Cam Sensor
Any ideas are appreciated. I don't have logs on this PC, however they don't show anything abnormal. TPS at WOT is 93%, 10.8% at idle. AFR and Injector cycle stays steady.
Currently messing with my brother's 98 GSX. We are running an EVO 8 ecu with 9653 Rom. We have an issue where hitting 5k+ will start to breakup/miss. On or off boost, doesn't matter. I can vary the fuel from 11.1-12.4 with no change.
I have noticed one thing that helps, going lean. Running a 13+ AFR (E85) causes the break up to disappear. Obviously this is too lean to run normally, Is this simply the fuel overpowering the spark?
25PSI on an FP Green, aiming for 30PSI plus.
We have tried:
93 or E85
No Boost leaks
New plug wires,
New plugs (BR8ES @ .022)
New PTU
More timing,
Less timing
Less boost
More boost
Tested the Coil pack
Added Grounds
Changed Cam Sensor
Any ideas are appreciated. I don't have logs on this PC, however they don't show anything abnormal. TPS at WOT is 93%, 10.8% at idle. AFR and Injector cycle stays steady.
Last edited by Project_Broke; Aug 22, 2018 at 05:55 AM.
#7
Cam sensor has been replaced with known good. Fuel injectors are new. No CELs, timing checks out with a light.
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