Cascade Crew

91camaro_rs · Posted: Mon Jan 28, 2013 1:56 pm Post subject: my friend cant get his car going

ok so my friend has an 87 2.8 t5 car. and for some reason we can start it and it runs for two seconds and dies, we can keep it running with ether, i tried to adjust iac and tps but you cant put it in diagnostic mode for some reason. its not a vats car, he has new iac, tps, injectors, maf. the fuel pump is hard wired to a switch idk why he said he couldnt get it to work normally so he threw a toggle on it.

any ideas??

aaron_sK

91camaro_rs · Posted: Mon Jan 28, 2013 3:22 pm Post subject:

i dont think the SES light works at all he said only like 2 of his dash lights work. the fuel pump relay is new as well, i tried to get my laptop to connect to it but it wouldnt work

Twilightoptics · Posted: Mon Jan 28, 2013 3:34 pm Post subject:

If it runs on ether and you cant keep itnrunning with th e throttle open its a fuel delivery issue. Start with fuel pressu.

MrMike98 · Member Joined: 18 May 2010 Posts: 231 Location: Bremerton

sounds like more than one issue....
but the current problem could be do to an electrical problem between the oil pressure sending unit and fuel pump relay.....i beleive low or no oil pressure signal might be an issue here...

aaron_sK · Posted: Mon Jan 28, 2013 5:41 pm Post subject:

Oil pressure switch doesn't work like that.

It is designed to trigger the pump in case of relay failure.

Regardless, it sounds as if that system has already been poorly bypassed.

91RSVert · Posted: Tue Jan 29, 2013 3:49 am Post subject:

Would the cold start injector not working cause this?

Fuel pressure is another good one to check.

aaron_sK · Posted: Tue Jan 29, 2013 7:13 am Post subject:

91RSVert · Posted: Tue Jan 29, 2013 6:19 pm Post subject:

BluFbdy · Posted: Thu Jan 31, 2013 10:42 pm Post subject:

It's very confusing, I went over there and ran over the basics with like and Brandon, its getting 45 psi to the fuel rail, new injectors so no blockage there, his tps is showing source voltage on the reference wire for some reason which I think may be part of it, I got ballsy with ether and had it going for 4 seconds as opposed to the 2 it normally ran, I'm at a loss myself on this one

aaron_sK · Posted: Fri Feb 01, 2013 6:58 am Post subject:

Are the injectors getting a proper pulse from the ECM?

I'd bet this is a wiring or ECM issue, possibly faulty ground.

BluFbdy · Posted: Fri Feb 01, 2013 11:17 am Post subject:

I didn't have any of my tools with me so I couldn't really do any checks on that, ill throw a test light on his injectors next time I'm over there

Twilightoptics · Posted: Fri Feb 01, 2013 11:35 am Post subject:

Is it holding fuel pressure foe the 2 seconds? Maybe jump the pump on and try again.

If its a maf car' disconnect thr maf and try.

91camaro_rs · Posted: Fri Feb 01, 2013 6:21 pm Post subject:

we tried using a brand new ecm and that didnt help, and we did a noid light test and they worked. gotta be something electrical, like something cut somewhere or something

BluFbdy · Posted: Fri Feb 01, 2013 6:39 pm Post subject:

Could a bad ground screw with the injectors and give the tps source voltage on the blue wire?

Twilightoptics · Posted: Fri Feb 01, 2013 6:49 pm Post subject:

Slow down guys.

If the noid light says the injectors are firing, and you can 100% confirm fuel pressure is there and STAYS there.... then it's time to put a timing light on it and see if it's sparking properly.

I've seen a lot of maf cars with a big vacuum leak or bad maf, do the flare up then die and no amount of throttle will keep it going.

Must start with the basics! FUEL/AIR/SPARK!

BluFbdy · Posted: Fri Feb 01, 2013 8:36 pm Post subject:

Twilightoptics · Posted: Sat Feb 02, 2013 12:37 am Post subject:

This pertinent info should have been mentionee in the original post..... roll eyes

aaron_sK · Posted: Sat Feb 02, 2013 9:06 am Post subject:

BluFbdy · Posted: Sat Feb 02, 2013 9:21 am Post subject: