347stroker

Hi, Ive been trying to converts a 4 to an 8 for a little while now and am getting very close. THe wiring is really messing with me. Ive got a 347 with an 89 engine harness that goes back to a 88 8 cyl computer. Ive also put an 89 harness in behind the dash that goes to igniton and out the firewall on driver side. This is all in a 93 lx. Its got new comp, new igntion module, ignition switch. Ive got everything pretty much working now but when I turn it over there is no spark until I let off the key. Ill turn it over and have no spark but the second I let off the key there is a quick spark. If anyone can help me I'd apreciate it a lot</P>


thank you
Jamie </P>

Buzzstang

did you keep the car fuel injected? the 88 computer is for a speed density car where 89 and up is mass air car. i dont know if that helps or not.

n2o44

yes i belive the terminals are not the same in maf and sd cars . are yousing the stock calib or do you have a chip or piggy back tunner?

Buzzstang

yeah i found that out the hard way i got my number mixed up on computer and i was about ready to pull my hair out then i realized that they are the wrong numbers.

347stroker

Well on the computer I bought it said it was mass air and it is the same number computer as what I had (A9L) I believe it was. We just figured out though that when the key is on and we jump the starter solonoid, (screwdriver across the two points) it has plenty of spark, so we did this just to see if it would start and now we found out its not getting fuel, the rails are pressurized but its not going through the injectors. I put on 30lb injectors and have an accufab adj press reg. We tested the voltage going to the injector to see if it was getting enough juice to open the injector when it needed to be but it was only getting something like .18 volts. does anyone know what they shud be getting and if not that then what to fix?

n2o44

how did you test this ? you dont at least that i know of. a voltmeter while connected to the positive side of the injector is not fast enought to capture that . only noid light and labscope will see it. if your getting spark the pcm sees the pip signal and know the motor is turning over . is your maf calib for those injrctors . your injector harness connection ok?

347stroker

Yes I did test with voltmeter, didnt realize it wasnt quick enough to capture the reading. Well I have a new mass air flow sensor that was supposed to be calibrated to the injectors I have. Its a 76mm mass air flow. Injector harness is connected securely. Think I could have been lied to about the computer being a mass air flow computer? They told me it was out of an 88.

horatio102

88 wouldn't be mass air. It's possible that the car it came out of was converted, but iirc there's a piggyback module that does the converting.

347stroker

so should I try buying another computer from an 89? What not having mass air cause injectors not to open?

horatio102

Beats me. It wouldn't hurt to try an eec from the same year as the harness/motor. Got any friends who might lend you one?