Burken01

iTrader: (88)

Hey guys just trying to fire my car up, it starts for 2-3 seconds and then dies..

I wired in the efisource 3 bar sensor and when I'm hooked up to hptuners scanner it reads 105kpa with engine off key on..

I tried deleting the stock map pid in scanner and using the 3 bar reading with the engine off and it's at 0kpa?

My tuner says it should read 99-101kpa before starting the engine and thinks this is why my car won't start up..

That and the scaling information is hard to find for it, I know it's similar to the gm 3 bar sensor from the 89 turbo trans am..

Also this is my first turbo car, I cut the pigtail off the stock map sensor and soldered in the pigtail that came with the 3 bar sensor.. Just want to make sure it's supposed to be ran off the same wires as the stocker

I've been calling my tuner multiple times today and don't want to keep bugging him with a million questions, I'm using a break in sd 3 bar tune by the way..

Anymore insight or other areas of concern as to why the car won't start?

SSZ

May be a dumb question but maybe it has something to do with the VATS.

Burken01

iTrader: (88)

That doesn't sound dumb at all, I'll check it out

Burken01

iTrader: (88)

Ok I turned it off and it still won't stay started

LT1RAY

iTrader: (21)

Do you have an android phone? An app I like to use is "SyPressure". It's a free barometer app that provides current atmospheric pressure. This reading should be the same as what your getting with the KOEO. Here's a screen shot of the atmospheric pressure in Colorado right now.



1 or 2 kpa difference won't hurt. If it's really off, adjust the map sensor scaling. Might have to use the offsets for the GM 3.3 map. But it sounds like the car isn't entering SD mode. How was the maf failed? It's normal for the Gen III pcm's to read 0 kpa with either the 2 or 3 bar pid. Only the 1 bar pid will read KOEO kpa.

Burken01

iTrader: (88)

That's a sweet app, we adjusted the scaling and it read 101 Kpa KOEO

I tried starting after disabling vats and it idled for a split second longer, also I checked DTC's on the last start up and it was the first time the maf codes were thrown.. All the other times I tried starting I never had a maf code...

It could possibly not be going into SD, I'm still learning. Forced learning curve right now lol

I tried data logging the very last start up since I've never done one and wanted to give it a shot..

I have a lc1 wideband plugged up to the hp interface and when I started the car it shot up to 11.2 afr before cutting off

But I don't know how accurate that is since the car didn't start?

denmah

iTrader: (2)

what size injectors?

sounds like VE table or injector size or something is off.

i use scaling 305 kpa
10.33 spacing

Burken01

iTrader: (88)

SD 80lb injectors, is 105kpa out of the normal for key on engine off?

Should the mafs be failing and popping up in DTC's because out of the 6-7 times I tried to start it, the p0102,p0103 codes only popped up on the last try

RonSSNova

iTrader: (3)

Do you have the DTC's for the maf turned off in the tune?
Does it seem like the fuel pump is running?

Burken01

iTrader: (88)

I have an electric fuel pressure gauge, I used vtc controls to test it and it builds perfect 58psi, it primes and builds pressure with key on as well.

P0101, p0102, p0103 are all set to 1- mil on second error

Should they be 3- no error reported?

Ryans99ls1

iTrader: (16)

When i switched to 2bar SD my car did this exact thing on startup. Tuner put a base tune together so i could just idle the car but it would fire and die pretty quickly. I finally got the car to him and we could never get it figured out until we loaded a 100% stock file/OS for a 99. After we started working off that, things were fine. Really strange problem.

Burken01

iTrader: (88)

Hmm, so you did "write entire" another stock 99 file, then reconverted to SD again?

Burken01

iTrader: (88)

Oh also only one DTC is showing during startup,

P1637 - generator L terminal

I googled it and it shows maybe the alternator exciter wire? Would that cause this problem

edwardzracing

iTrader: (59)

Did you convert to a 99+ PCM or are you still using the 98?

Burken01

iTrader: (88)

I repinned the 98 harness for a 2001 0411 pcm

denmah

iTrader: (2)

if they are 80s you could try copying over most of one of my base tunes

rockoosi1

iTrader: (1)

Great App! I just grabbed it.

RonSSNova

iTrader: (3)

Yes, although might not fix the problem. Car should run with no maf

Ryans99ls1

iTrader: (16)

Yes.

See this makes me nervous that its same problem i had. Back when i first got the car, someone flashed a stock 01 OS onto my 99 saying it was faster/better (i just wanted my O2's turned off). Ever since we did that, the thing was a bitch to tune and it really showed its face when i went SD. When i remembered that and mentioned it to my current tuner, he reflashed everything back to the way it came from the factory and started clean. No problems since.

edwardzracing

iTrader: (59)

The alternator/generator code will not keep the car from running. I had that code as well after repinning mine. If you want to fix that, run a wire from RED connector, PIN 15 to the B pin on the alternator plug. Until I did this, my alternator wasn't even working.

Have you ran the car SINCE doing the re-pin? Like before you did all the turbo stuff?