Turk82

iTrader: (17)

Ok, for those that didnt read my thread last week, I was having stating issues, that has been solved. It ran fine, drove it around the block and parked it for a week.

Flash forward, I went back out to the car yesterday and adjusted the TPS because it was out of spec and the car would buck at low speeds, also brought my fuel pressure to normal levels, 40psi. Got TPS within spec, (.47-4.23V and 1.11-4.97V) dont quote me on the numbers but they are in spec. Started the car, backed it out and then it started an idle surge but really low. I gave it the benefit of the doubt that the PFC was learning to idle again. Car then died and now dies anytime after you start it up and it settle to idle. If I keep my foot on the gas, say 1.5k rpm it is fine.

Now to get to the TPS bolts I had to unbolt the UIM and unplug the MAP sensor. other than the TPS and fuel pressure nothing has changed.

I found this thread on a very similar issue but there is no final answer to the problem. https://www.rx7club.com/3rd-generati...nning-1003139/

Specs on the car. 0 mile streetported motor, 850cc primaries 1600 sec (should mention that the car would only run well on 725cc setting last week, seller assures me that they are 850s though), AEM FPR, rx7.com Denso pump, emissions delete(only have IAC IAT TPS left on harness), single turbo.

could use your input greatly, really need to start breaking this motor in.
Thanks,
Ryan

DriftDreamzSS

iTrader: (4)

Did you try to re initialize the pfc and do idle learn again yet?

Turk82

iTrader: (17)

Did not try, because I was unaware that would be necessary. How exactly do I initialize he PFC? I have disconnected the negative and pressed the brakes to reset sensors.

MazdaSpeedDan

iTrader: (4)

**** im going to be in the same boat, I forgot to disconnect my ECU before I pulled my motor, and Ive been pulling the car in and out of the garage using the brakes. ****.

Turk82

iTrader: (17)

so doing some reading on the PFC forum i came up with this. I should be able to reset my PFC from my commander. Now I am unaware what exactly this would do. Would it reset my maps and put the basemap for the twins back on there?

I am not very concerned about what is will be trying to do with boost settings because I am only trying to break the motor in but if it does reset it to a twins map can I just change my injector settings and be safe to drive on the car?

Turk82

iTrader: (17)

Update. started the car today and it iled perfect for about 1 min. then began its surge but was not shutting off like yesterday. I then thought maybe a vacuum leak from UIM to LIM because I had to take that off to get to the TPS. so I removed that gasket, cleaned it, and resealed it. started the car up and didnt solve anything, car might not surge as low as before(maybe 50rpm higher.

I then let it do its thing for a while , thinking let the PFC fix itself if it was learning, so 10 min passed and nothing really happened, turned the defrosters on, 10 min later the car dies. so I restart it and pull it in the garage accepting that this might be beyond me.

My only other thought is that something is haywire in my engine harness. I did a single turbo conversion to it recently but that wouldnt explain the fact that it was idling perfectly last week. my speedo now sits at 20 and revs with the tach, a problem I fixed last week.

DriftDreamzSS

iTrader: (4)

Yes, when you re initialize the pfc you will lose all your settings and the base map will be loaded, you need to make sure you have your current map saved so you can re load it.

From what you describe (0 miles on motor, only driven around the block once after other problems, adjusted tps and fuel pressure) I would basically just start from scratch. Check your baseline throttle body adjustments, tps and do idle learn procedure then adjust further with aas and idle speed settings. I would suggest targeting 1000rpm idle (idle speed settings on commander will likely be a little different) at 12:1 afr with those 850's as they can be tricky to lean out to a more ideal 13-13.5:1. In fact since you are pretty much at the starting point I would strongly recommend replacing those 850's with oem 550's or ev14 725's. This thread is a great starting point:

https://www.rx7club.com/3rd-generati...needed-841706/

Turk82

iTrader: (17)

So I was at the end of my rope yesterday and I decided to jack the fuel pressure back up to about 55psi according to my FPR. Started the car and the surge was now only from 850-950rpm. So the problem is isolated in the fuel system but the question now is where, wiring, pump, FPR, or injectors. My bet is on the wiring or injectors but what is wierd is that if i hold the throttle it doesnt stumble at all.

I was reading a little on the Ev-14s and I think i will go that route. I was thinking about buying an FJO to eliminate the resistors but the EV-14s will eliminate the need for all this, just plug and play.

does anyone have any more info on the ev14s? I would think they will just drop right into my rails with no issues.