Don Muise

i just swapt a crossfire injection with a 350 4bolt main, 2000 model vortec heads, ported slp runners, 22lb injectors,I have 42psi of fuel presser, i instauled wire harness, connected all censers except the o2 censer and I'm useing the 305 computer to get it running, my question is would the o2 not being conected and the fact that I haven't received my 350 computer to instaul it would these two items make the car run extreamly RICH?
yes the engine has a mild cam as well.
Can anyone help with this problem?

BrandenCali

Well I think you have probably answered your own question.. Your not going to run correctly with a 305 chip.. with a 350..

Morley

forget the 305 vs 350 chip, no O2 sensor....you could either be pig rich or so lean you'll burn up the engine

BrandenCali

If he is going to run right he needs a chip done period!! 305's come with 19lb injectors and he now has 22lb injectors.. No matter what car needs chip.

Morley

No argument on that but he needs a functioning O2 sensor first.

BrandenCali

That is a must.. Wonder why he didn't connect the o2 sensor..

Morley

dunno, but without it the ECM is blind and stupid.

Don Muise

well let see the headers did not have a place for the O2 sensor at that time but I have welded one on and put the 350 computer on it hopeing to fix the problem but guess what it still burns rich...black smoke and bluish white..you can smell the fuel, i'm running 42PSI of fp with an ajustable pr. can you all help?..I gave up on any responce from anybody, thank you....I have changed and swapped motors on several T/a's and never had this problem but then again I never put a hot cam in one either any help would be greatly apretiated and thanks again.

BrandenCali

Well I can't help you with cross fire injection, I heard that it is a pita to work with, Im still thinking tuning, If you have a lt4 hot cam, most of the time you need a chip burned for your combo, But the rich problem could also be some thing else. Just no experience with cross fire injection here sorry..

Morley

Is this a crossfire system or you replaced a crossfire with TPI? If it is crossfire, isn't 42 psi way too high for it? I don't know much about CFI, but basically it is just a dual TBI system and the TBI's run at like 12-14 PSI.

BrandenCali

I don't know either what he has, Im confused He says he has Vortec heads.. He could have a tpi.. or could he have cfi with vortec heads also??

Don Muise

I have a 350 4 bolt main block with 2000 model vortec heads and TPI set up from a 86 trans am..I have slp runners which have been ported...it has a hot cam....The car had a crossfire injection that was taken out (harness and all) and instauled the TPI harness, does this help?

Don Muise

here is what I have PICS

Don Muise

here is a pic http://www.geocities.com/corvette9671[/URL]

Morley

Check for leaking injector('S), especially the cold start injector. Does it idle well? What chip are you currently running in the computer. You mentioned getting a "350" computer, the computer has nothing to do with engine size, the 165 ECM was used on 4 bangers all the way through 350's, it is the chip that makes the difference. Post the 4 letter code found on the silver sticker on the prom chip.

Don Muise

ABWT 8674

RBob

iTrader: (1)

That is a '87 Firebird L98 350 TPI cal with an auto trans.

RBob.

Don Muise

That is right!...so sugestions to why it may be running rich?

Don Muise

well guys I think I solved the problem.....The harness I instauled had an extra pig tail for another control box for the mas air flow, I did not see it when I instauled the harness, I plugged the control box on the harness and it quit smoking but I probably will still need a chip to compensate for the cam I have, Thanks for the help and insites

Morley

You have a MAS module piggybacked to the ECM? If that is the case, you have a 1985 harness for the 870 ECM

Don Muise

That is what I found out, now the 165 computer plugged right in and run, Is this computer realy compatable with this harness or do I need a chip for this ecm that came with the harness?

Morley

You'd need to repin and do some splicing on an 85 harness to work correctly with the 165 ECM, and the rework eliminates the MAS module ($800) and replaces it with 2 relays ($14 each)

I can't believe that the 165 ECM is working with that harness unless it was already repinned for it.

Don Muise

That is why I could not figure out the rich problem, I have done this several times, I just did not catch that pig tail on instaulation which caused it to run rich with both ecm's, I put that 305 ecm back on and the car runs great, but I'm trying to find a 350 chip for that 85 ecm, I bought it off ebay as a 86 harness and ecm. with all the sensors and I'm glad I foud that mas module or I probably would have scrapped the whole project, now that know what when wrong I may just buy another harness and computer, thanks for all your responces and help from all of you Gents.

Morley

Since you already have spent the money on the harness and now know the harness is in working order and have it installed you may want to look into this http://www.eecis.udel.edu/~davis/z28/ecm_swap/ Just a few repins and splices and you'll be able to use the 165 ECM with it. The only 350 chip for the 870 application is from the 85 Vette.

Don Muise

Thanks for your help MORLEY, I really apreciate ithttp://www.geocities.com/corvette9671[/URL]