futureuser

iTrader: (1)

Every now and then it will pulse the injectors while cranking and fire up, then die. When it does pulse, it's just once.

Spark is good. Grounds are good. Vats is turned off. Battery tested good. Painless 60526 gen 4 harness, tuned mail order for now.

Would love some more ideas. Thanks.

Old Geezer

iTrader: (3)

Power is lost when key is released?? Has to be hot in start AND run key position.
Injs are sticky from sitting?
Rpm signal when cranking? No sig, no fp turn on.

futureuser

iTrader: (1)

Thank you for the response.

I have temporarily connected the ignition wires from the harness straight to the battery to assure they have enough power and not interupted while cranking.

The engine fires up when I get an occasional single pulse at the injectors while cranking, so I have temporarily ruled out the injectors. I am looking for pulses with a noid light pluged into the harness. When I get a single pulse, the engine fires.

I have a fuel pressure gauge hooked up to the rail. When it cranks, the fuel pump turns on and I get 58psi. When I stop cranking the pressure drops to 55psi and holds.

If I squirt a little gas into the intake the engine will fire and burn that fuel, so I have ruled out spark as well.

Do I need it hooked up to efi live or hp tuners to check rpm signal?

Any input would be appreciated!

My tuner has checked the computer twice to verify vats is turned off. I am getting codes 0010 and 0315.

Doubledip

Disable starter checks in the tune as well and it will start

futureuser

iTrader: (1)

Thanks again. Will check on this.

futureuser

iTrader: (1)

If oil pressure sender is disconnected, will this keep engine from starting?

Schwanke Engines

iTrader: (1)

Sounds like you should have got one of our harness's. They don't have something right there.

Old Geezer

iTrader: (3)

"injs are sticky from sitting?"....Like I mentioned.

Schwanke Engines

iTrader: (1)

I am telling you, I am 99% sure it is the harness. I can fix it for $150.

futureuser

iTrader: (1)

If the injectors are sticky then, why does it fire up when I get a single injector pulse? I'm not getting pulse at the injector and with out that, I could have brand new injectors and it still wouldn't fire.

As far as the problem being in the harness, could be and I might take you up on that. I am going to have my guy at Vengeance look at it first, since they are already involved. I was hoping there was something I could do myself but probably not.

Old Geezer

iTrader: (3)

"If the injectors are sticky then, why does it fire up when I get a single injector pulse?"
How do you know you R getting only 1 pulse?? Do you have a noid light to check for injector pulsing??

futureuser

iTrader: (1)

Yes. I'm getting an occasional single flash with the noid light while cranking.

crosstraining

iTrader: (1)

Did you find out what the problem was? I am having a similar problem, only I am having just an occasional pulse on just 2 injectors. The rest pulse just fine.

roughneck427

iTrader: (12)

Well was the patch done fo the vats shut off?? Also i had to add a resistor on the starter relay sensing cicut on a painless harness that i had issues with injector pulse

Doubledip

As i said before .. easier to disable starter checks...

frojoe

iTrader: (10)

How did you end up fixing this? I get the same problem.. initial injector pulse and it fires up for about 1 second then putters out and hptuners shows zero pulse after that 1 blip. And VATS is off.

Thanks!
Joe

futureuser

iTrader: (1)

Sorry Joe,

I'm not subscribed to my own thread. The issue was a faulty cam position sensor and what I was told by my tuner was that the pcm was looking for the bcm in order to run. He did fix the issue with HP tuners.