assassin10000

Well.... long long story short. Fixed it. Found that somehow the anti-lag was on, even though I remember setting it to 'off'. :oops: :evil: Happens to the best of us. I'm definitely not that good. But the tuner I went to didn't catch it either, and he's pretty good. Neither did the guy at the shop I purchased the ECU from. Andrew

1. Yes, this TPS was originally used on cars with DBW. I checked scale and it was all good. But as a just in case measure I've since swapped to a non-DBW TPS that has the standard idle switch instead of a reverse scale output for the 2nd output pin. Also brand new. 2. Checked TPS, does not stop at 80% scale. 3. TPS voltage keeps increasing right up until throttle is fully opened. 4. My engine has no IAC/Idle valve. It's the butterfly's and idle screws only. 5. Throttle cable is good, not too tight and not too loose. 6. TPS reads .54v at fully closed, ignition on and not running. 7. Calibrated TPS, both running and not running. 8. Checked run-time valvues, no pauses/dips/etc. Voltage climbs smoothly all the way until WOT, and all the way back down to closed. 9. Fault is still present. When fault occurs A/F appears to be all over the place. I've taken a log if anyone wants to look at it. Unfortunately I only have an LC1 currently and I'm not too sold on it's accuracy. 10. I tried playing with the timing with no change where this occurs.

No one has any ideas? I do know the newer style TPS on the throttles doesn't use an idle pin like the older TPS did. Instead the second output pin puts out a voltage just like the first, but its in reverse scale as the throttle opens it drops from 4-5v down to 0v. Where the normal pin goes up from 0-5v as the throttle opens. This 2nd TPS output is not wired to anything so it shouldn't matter. But I'm wondering if maybe it has a fluctuation or something that's causing the ECU to flip out. The TPS voltage looks steady when I watch the screen which is why I've not really done much thinking about this, that and even though I rotated & repositioned the TPS a few times the stumble/pause/hesitation stayed at the same 2k rpms. Andrew

Powered as in key on/engine OFF or as in Key on/engine ON(running) ? When I do a TPS set with key on/engine off it shows the same 0% as it does when the engine is running. DFCO is turned off currently. I also tried setting the TPS while a battery charger was hooked up so it was seeing the same/similar voltages as when the engine is running. I agree, somewhat strange advice. But the shop had come across a similar situation and this is what they found kinda 'worked'. Right back to the original problem. That was one of the first things I tried. Yes, I hit 100% on the TPS axis when the throttle is actually only open about 84%. Not a huge deal on a multi-throttle engine... from what I understand. Andrew