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iTrader: (33)

Cause thats the problem i am having.

The car starts and idles perfectly. No smoke and actually drives straight.

The problem happens when you step on the gas rapidly. The car will not recognize its position in the revs and it will just die out.

If you stay on the throttle, it will rev fine, it just stalls when you step on the gas repeatedly.

Like you know when you're coming off a stop and you blip the throttle a couple of times? Yeah when you do that, the car will just stall out, like it cant find its place in the rpm fast enough and just stall out.

My first assumption was the TPS and i checked the settings but i only checked closed and WOT and they were both in spec. I didnt check the "closed to open". Could this be the cause if thats not in spec? It makes sense because closed to open, thats what im doing when im blipping the throttle. But can it really make the car stall like this??

BTW, i have a new fuel pump, new fuel filter, new spark plugs, coils and wires and fuel pressure is fine so i know its not that.

clayne

You need to check every sensor that the ECU cares to look at.

I suggest you also check the 1st/2nd gear switch and/or clutch switch. In addition, get a PFC and a commander or find someone to let you borrow one.

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iTrader: (33)

Clutch switch checks out ok. Will look into the 1st/2nd gear switch although the problem occurs whether in gear or neutral, does that matter?

Im getting a PFC soon but i prefer the car to be running straight before then.

Maybe its a bad ECU?? Is it worth it swapping another ECU just for the hell of it?

clayne

Highly doubtful it's a bad ECU. In fact, extremely doubtful.

The reason the PFC + Commander is good for you is because it has the sensor mode where it will indicate which sensors are triggered at any given moment.

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iTrader: (33)

Thanks, PFC was dead next on what to get so i might as well wait til i actually get the PFC. Cant drive the car legally anyway cause im still undergoing the interior conversion.

Thanks for the advice.

magnus.rx7

I had the same problem happen to a car I tested with a PFC. He told me his car was tuned rich (for track use mainly). I don't know if this could be one of the reasons, but I'm sure it could be quite easily fixed by proper tuning.

seanbrowning

My car is the same way and I am just chalking it up to running rich. Now it doesn't die, but if you touch the throttle and let off quickly it will rev then drop to low RPMs and slowly climbs its way back up. I'll let you know whether or not its the tune when I get it tuned soon.

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iTrader: (33)

So maybe my car is running rich, i have a supra TT fuel pump now.

I need to get that damn PFC so i know what the hell is going on.

seanbrowning

Yah, I have 1300cc secondaries, a cosmo fuel pump and a PFC without a commander, I believe running the base map and I have no doubt its running rich(I have a Knock/Retard + A/F Ratio guage as well). I can't wait to get it tuned, it should smooth that out along with problems when starting after a warmup. :/

mad_7tist

tps issue , dead spot, would show up in normal driving not just in a neutral rev

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iTrader: (33)

So it is a TPS problem?

FYI, the problem occurs whenever i blip the throttle repeatedly. Whether if im in neutral, in gear with the clutch in, switching gears etc.

The car even stalled when i shifted from 1st to 2nd. I revved carefully out of 1st, eased to about 2k rpm, then soft shifted to 2nd right away and gave it gas and the car stalled while moving.

I will triple check all TPS settings my next day off and adjust it if necessary. Kinda hard to do all that with only one person.

mad_7tist

for me it has been easier to just back probe the ecu where the tps wires come in, use the fsm. then sit in driver's seat and slowly push the pedal down watch for any opens or jumps

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iTrader: (33)

Yeah ill figure it out. At least i ruled down the TPS being the possible cause to the problem. I really cant think of anything else that could be wrong. I changed everything, nothing else was touched, just the TPS. IT has to be it.

I will update if anything.

Thanks