Please help 1991 camaro z28

[FredCamaro]

I have a 1991 camaro Z28 5.7 L, the car does not run at all it crank but will not start. The fuel pressure was check and it is ok, the engine have fire because when we put some gas in the intake it start. The Dist HEI module was replace and the car still not work ! It seems that the injectors get no signal, all the wirering seems ok too what could it be... Please help me.

[Rally Sport]

Okay then it seems your car is getting NO fuel, i'd check lines, maybe you need a new pump, change filter, run the car for codes as well.

[Morley]

Check the inj 1 & inj 2 fuses. After that, check all grounds, ignition module and ECM.

[FredCamaro]

ok The fuel pump seems to be ok because the pressure test was good, the fuse are ok, the fuel line is ok and the ignition module has been change. And the car still dont work ! Could it be a faulty injector or like morley said the ECM. How could I know ?

Thanks in advance

[ct91rs]

One faulty injector won't keep the car from running; you have eight of them. If it was a $30 module it may be garbage already. My advise is to listen to what Morley has suggested.

[Morley]

If you have good spark, good fuel pressure and good grounds you'll need to get a digital volt/ohm meter and start tracing wires. First thing to do is ohm out all 8 injectors, they should be 15-17 ohms, if any are 10 ohms or less they are toast. Next you need to check the ref signal wire from the ignition module to ECM for open or short to ground. If that checks good get a 'noid light (or 8 of them) and hook it to the injector connectors on the harness and crank the engine. The light (s) should blink on and off as each injector is fired. If you get no lights or if you only get 2 or 3 flashes from each then no more you either have ECM issues or the new module is tango uniform....you DID replace the igintion module with an AC Delco unit..right? If not you just threw away money.

[FredCamaro]

Finally ! Thanks Morley I check the injectors and a found one that give me 6 ohms there is my trouble. When this injector is disconnected the car start. Bad news one injectors cost 175 $ canadian (garage price). Well thanks you very mutch for helping me !

[FredCamaro]

Dammit, the injector was replaced and the car runs like a charm but after like a hour, when i started it again the car was still missing on cylender. I check the injector again and I found two more were toast. Is it possible that after replacing one and run the car a bit 2 more toast at the same time ?? Are they gonna blow all like this ?

[Morley]

Don't replace any more of those injectors! Replacing them 1 at a time is not the way to do it. Go here http://www.fiveomotorsport.com/Injector_SetsTPI.asp and get a complete set of 22 lb injectors.
Your old injectors are multec's and they are well known to be a P.O.S.

[FredCamaro]

OK I shop a bit and I found some good deals at a performence shop near me. I can get 8 accel 24 lbs injector for 462 $ canadian or same thing but 21 lbs for the same price. They dont have bosh but if there are better ill find them. I can also get 8 MSD injector 22 lbs too. Now what is the best injector to buy : Accel , MSD or bosh ?

Thanks for helping me.

[Morley]

Originally Posted by FredCamaro

Now what is the best injector to buy : Accel , MSD or bosh ?

Don't get the Accels, I've heard lots of bad reports on them. Also i had a set of the Accel 24#'s but they wern't 24#, more like 20.5#, other than that they worked ok but no where near as good as the LS1 Bosch injectors I swapped to.
I can't comment on the MSD injectors, never heard anything at all about them.
See if you can get some Ford Motorsport injectors, they are cheaper than the others and have a good reputation.

[FredCamaro]

Ok Morley i found a set of 8 bosch fuel injectors 30 lbs for 289.99 US What do you think ?? Is it good.. I want some quality

[Morley]

Originally Posted by FredCamaro

Ok Morley i found a set of 8 bosch fuel injectors 30 lbs for 289.99 US What do you think ?? Is it good.. I want some quality

Too big. you'd need a custom burned PROM to be able to use them.
You'd need to stick with 22# or get 24# and an adjustable regulator and turn it down to 36 psi.

Order these from Summit they are 23# but should be just fine.
http://store.summitracing.com/defaul...=egnsearch.asp

[FredCamaro]

By the way do you know what sparkplugs wires should i get mine are done. What is the best choise, Taylor wires, Msd supra conductor or the original gm wires.

Thanks

[Morley]

Originally Posted by FredCamaro

By the way do you know what sparkplugs wires should i get mine are done. What is the best choise, Taylor wires, Msd supra conductor or the original gm wires.

Thanks

I personally use Accel spiral core wires