RPM fluctuation at WOT
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RPM fluctuation at WOT Not sure if this belongs to this section, but I thought of posting it here since I have a FI car. Anyway, whenever I go WOT, the RPM increases with about 200 rpm fluctuations. It does that in all gears & continues to do that until the rev limiter. I verified this visually by looking at the gauges & via HP Tuner scan log. Speedometer looks to be working fine
I recently had my diff. & tranny oil replaced, along with new plug wires & new spark plugs. Could any of those changes be some how related to the problem?
I recently had my diff. & tranny oil replaced, along with new plug wires & new spark plugs. Could any of those changes be some how related to the problem?
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There was no change to the tune. I verified that wideband A/F ratio & timing are okay. I went from MSD plug wires to Magnacore. I also went from NGK TR6 gapped at 0.026 to another set of TR6 gapped at 0.030
It could be a tranny/converter problem, because I do feel some slight vibration in the drivetrain. Part throttle is still okay though and the car shift & converter locks just fine
Is there anyway we can isolate this problem into either a converter or transmission? Could a tranny/converter low on oil cause such symptoms?
It could be a tranny/converter problem, because I do feel some slight vibration in the drivetrain. Part throttle is still okay though and the car shift & converter locks just fine
Is there anyway we can isolate this problem into either a converter or transmission? Could a tranny/converter low on oil cause such symptoms?
Last edited by xxxhp; Jan 4, 2008 at 05:32 AM.
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Well, I went back from 0.030 TR6 to 0.026 TR6. I also switched from Magnecore wires back to MSD wires. There was no change & the problem is still there 
Here is a sample log, Iam sorry I don't know how to make more read-able
Engine RPM Vehicle Speed Throttle Position Ignition Timing Knock Retard Trans Current Gear Wide Band O2 - LM1 afr
3002 61 100 15 0 3 14.53
3368 61 100 15 0 3 11.4
3735 61 100 13.5 0 3 11.84
4012 63 100 11 0 3 11.38
4166 63 100 11 0 3 11.01
4316 64 100 11 0 3 11.03
4506 65 100 12.5 0 3 10.86
4683 66 100 12.5 0 3 10.38
4848 68 100 12.5 0 3 10.1
4739 69 100 12.5 0 3 10.64
4958 71 100 13 0 3 11.51
5158 73 100 13 0 3 11.75
5338 76 100 13.5 0 3 11.85
5219 75 100 13.5 0 3 12.5
5384 76 100 13.5 0 3 11.88
5219 78 100 13.5 0 3 12.17
5442 81 100 13.5 0 3 11.89
5312 85 100 14 0 3 11.94
5456 82 100 13.5 0 3 11.87
5296 83 100 13.5 0 3 11.76
5446 85 100 13.5 0 3 11.7
5384 86 100 14 0 3 11.75
5538 88 100 14 0 3 11.81
5430 89 99 14 0 3 11.97
5586 89 100 14 0 3 11.58
5534 91 100 14.5 0 3 12.02
5482 92 100 14.5 0 3 11.71
5638 93 100 14.5 0 3 11.53
5655 94 100 15 0 3 11.76
5536 96 100 15 0 3 12.06
5560 97 100 15 0 3 12.03
5713 98 100 15.5 0 3 11.53
5730 99 100 15.5 0 3 11.46
5632 99 100 15.5 0 3 11.78
5790 101 100 15.5 0 3 11.8
5815 102 100 15 0 3 11.84
5794 103 99 15 0 3 11.95
5670 104 100 15 0 3 11.98
5746 104 99 15.5 0 3 11.6
5851 106 100 15.5 0 3 11.46
5895 106 99 15.5 0 3 11.56
5906 108 100 15.5 0 3 11.63
5842 108 100 15.5 0 3 11.59
5865 109 67 15.5 0 3 11.31
5023 108 33 14 0 4 10.7
5126 108 12 36.5 0 4 11.36
Here is a sample log, Iam sorry I don't know how to make more read-able
Engine RPM Vehicle Speed Throttle Position Ignition Timing Knock Retard Trans Current Gear Wide Band O2 - LM1 afr
3002 61 100 15 0 3 14.53
3368 61 100 15 0 3 11.4
3735 61 100 13.5 0 3 11.84
4012 63 100 11 0 3 11.38
4166 63 100 11 0 3 11.01
4316 64 100 11 0 3 11.03
4506 65 100 12.5 0 3 10.86
4683 66 100 12.5 0 3 10.38
4848 68 100 12.5 0 3 10.1
4739 69 100 12.5 0 3 10.64
4958 71 100 13 0 3 11.51
5158 73 100 13 0 3 11.75
5338 76 100 13.5 0 3 11.85
5219 75 100 13.5 0 3 12.5
5384 76 100 13.5 0 3 11.88
5219 78 100 13.5 0 3 12.17
5442 81 100 13.5 0 3 11.89
5312 85 100 14 0 3 11.94
5456 82 100 13.5 0 3 11.87
5296 83 100 13.5 0 3 11.76
5446 85 100 13.5 0 3 11.7
5384 86 100 14 0 3 11.75
5538 88 100 14 0 3 11.81
5430 89 99 14 0 3 11.97
5586 89 100 14 0 3 11.58
5534 91 100 14.5 0 3 12.02
5482 92 100 14.5 0 3 11.71
5638 93 100 14.5 0 3 11.53
5655 94 100 15 0 3 11.76
5536 96 100 15 0 3 12.06
5560 97 100 15 0 3 12.03
5713 98 100 15.5 0 3 11.53
5730 99 100 15.5 0 3 11.46
5632 99 100 15.5 0 3 11.78
5790 101 100 15.5 0 3 11.8
5815 102 100 15 0 3 11.84
5794 103 99 15 0 3 11.95
5670 104 100 15 0 3 11.98
5746 104 99 15.5 0 3 11.6
5851 106 100 15.5 0 3 11.46
5895 106 99 15.5 0 3 11.56
5906 108 100 15.5 0 3 11.63
5842 108 100 15.5 0 3 11.59
5865 109 67 15.5 0 3 11.31
5023 108 33 14 0 4 10.7
5126 108 12 36.5 0 4 11.36
