Mattis

Car 1987 trans am GTA 350tpi.
New engine 1994 caprice Lt1 9c1 350
i have engine, transmission(4l60e), harness and pcm from same car.

Problem, i have spark, fuel pressure but when i crank the engine dont get any fuel.
if i take a sparkplug out It is dry after crank.
I have Tunercat and have delete vats, 2 posts in switches table in Tunercat.
I think the problem is whit fuel enable signal, dk blue wire 25 red connector on pcm. Wire is cut off near to pcm.
Any idé vhat to do?

/Matte

86iroc504

How much fuel pressure?

Mattis

42 psi

86iroc504

Are your fuel injectors spraying?? Is your fuel pressure holding steady?

Mattis

Yes fuel pressure holding Stedy but no spraying!

Mattis

Next time in garage i Will do a diagnostic on opti and Icm.

86iroc504

If a/all fuel injectors are not spraying they are not getting power or they are clogged. Run a meter on the injectors connectors on harness to see if they are getting voltage

Are these new injectors or old?

Mattis

Will do! Them are old, dont know how old!

Mattis

It is something whit power to injector!
I have 12v om both wire to eatch injector all time
Battery is connected.
The pink ones should be connected to ignition switch
After what i can see on wire diagrams.
Is it pcm ignition feed that power the other wire? Pin B30 and D3 on Pcm.

86iroc504

I'm not sure about the wiring origins. It should tell you on the print. Did you pull the injectors off to see if the spray area is clogged or if they are leaking ? How long have you been having this problem

Mattis

No not removed injectors yet!
That i next thing to do. I put the engine in the car Now so IT is
A new problem for me.
Problably some wire i have Done wrong?

Firebat

iTrader: (7)

Here's a link to a '93 F-body Lt1 Injector schematic:
http://shbox.com/1/1993_injector_schematic.jpg

You will see 12 volts on both sides of all injectors until the PCM connects the ground side. PCM turns the injectors on/off by connecting/disconnecting ground. Once you get the PCM signal to the injectors, you may see 12 volts on only one side of the injector. I think the PCM switches the injectors on/off at a fast rate sometimes called fuel injector duty cycle so may be hard to see with a volt-meter?

To test injectors on LT1, take the whole fuel rail off of the intake manifold with 2 or 3 bolts, put paper towel under injectors, crank the engine to try to start, look for fuel on the paper towel.