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**IsaacHayes** · 11-01-2009, 03:52 PM

The PCM will still trip a code for the EGR. Once it tries to open it and sees no change in the MAP, a SES light will come on. Sounds like the FMU is raising the fuel pressure before it needs it and flooding a bit..

The best way would be to swap to some sort of PCM/ECM that would allow you to tune for the boost. 94-95 are un supported (OBD1.5) and use flash. There is an OBD1 swap you could do, but you can't run the turbo grand prix code and still have it control your trans. OBDII you could swap to and then tune based on the MAF for boost instead of the MAP, going with a larger (LS1) scalled MAF.

You could also go to megasquirt to control fuel and spark, and leave the stock PCM in there to control the trans.

**robertisaar** · 11-01-2009, 04:44 PM

could also go with the 94-95 LQ1 setup... MAF, tranny control, etc...

**Joseph Upson** · 11-01-2009, 05:54 PM

What's this check valve for the MAP sensor that you're talking about? From my experience simply bumping the fuel pressure up a little with coins on those with the removable cap or going up on injector size a few pounds an hour should be enough to get you going on low boost without any problems or tuning. I don't recommend that kind of simplicity but I've done it more times than I can remember in the past without any serious problems considering I had an air/fuel meter in my face to make sure I didn't lean the engine out.

Perhaps your precautions caused more problems than they solved, for example, the only thing I ever did to any of my caveman turbo systems is make sure that boost pressure could not go backwards through the PCV valve and that's it, everything else was okay in stock location including vacuum lines.

I would restore everything back to stock and see how the engine responds under light load and add your precautionary measures back one at a time.

**RedZMonte** · 11-02-2009, 04:17 PM

how are the check valves installed? are they inline blocking boost from the map or are they bleeding the boost off before the map? if they are just closing when the boost comes in then your map is not reading any signal at all. if they bleed the boost off before the map (correct way) it should still give the MAP enough readings to add the correct amount fuel.

'95 should have a MAP and a MAF IIRC.... my setup i have no check valves and the stock map reads the pressure up to 0 (1 bar) and my maf adjusts my fuel from there... you shouldnt need the check valves.. I ran mine this way with a 12:1 FMU for over a year before i went OBDII. everything on my engine from sensors to vac lines are all in stock location.. only thing i need to do is build a ketch can for my PCV and tie it back into the intake... lol and build an intake.

S

**robertisaar** · 11-02-2009, 04:19 PM

94-95 3100 only have MAP, no MAF except for the A-cars, those are MAF only, just like the 94-95 LQ1.

**RedZMonte** · 11-04-2009, 08:32 PM

Did you figure out the problem? any update?

**dirtbean** · 12-21-2009, 02:58 PM

yea a update sorry so long but great news after i replaced everything under the moon on the car i went to the junkyard and nabed a few tps and icm s and as soon as i put the tps on boom it awakens great idle great boost no stumbleing whatsoever. but now the injectors cant keep up to the flow and need some bigger ones do anyone out their know what size i have in my car? it has the 3.1 automatic w od .and what cars in the gm ,ford line have bigger injectors that i can nab from the frendly junkyard and use ? i have a split second arc2-ne comming in the mail so i can tune the bigger injectors with the stock 1.5obd (pos) and also their esc1 ive aquired both but i need to find some bigger injectors on the cheap. to the check valve question their aqurium check valves you can buy them at walmart you put them inline with the map sensor with some vacc tees with the arrow pointing out.youl need about 6 or so. what they do is fool the map sensor and dosent allow the map to read boost by bleading the boost press to the air but holding vac so the cpu never throws a code ever the check valves combined with a fmu of 8 to 1 and a good 255lph fuel pump . and you got a cheap turbo kit minus the turbo and piping good to about 10 psi . ive done this to many cars about 4 civics that owned and a 93 s10 2.8 v6 twins bot the olds had that underling problem the tps and that was throwing me off on this car. but now all fixed . i will admit that the above is not a permante soultion and better fueling is needed to have optmial results but its affordable and reliable (if you dont take it to the track and beat the snot out of it )and if you can fabercate you can bacily turbo anything that has a map sensor alone for ecu management .
on the cvvics they were 1.6l sfi and the gas mialage improved 15mpgs and i could out run vets on the street with the exact setup as stated above i drove it to ohio and bactk two times before i traded it for a z28 (dum me) i should have kept it.
on the s10 i did the turbo kit cuz i was bored and wondered if i could but it got better mpgs and ran a lot better than it did. but for the olds well see thanks for all the input and advice from all .

**ForcedFirebird** · 12-21-2009, 07:38 PM

Both Robert and I have given enough info on swapping in an OBD1 ECM here on the site

Sounds like a fun project, glad to hear all is well.

I blew my car up twice from tuning with an FMU, I'm sure you already know to be careful with them, specially seeing the GM ECM pulls fuel for rev limiting (both times I hit the limiter

)

If done right, FMU's work, but are scary at times. I talk to a guy making over 600hp in a Dodge Magnum truck using one and he hasn't asploded...YET!

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