6.0 doesn't want to light up - ideas?

[hoogiesngrinderz]

For the past couple days I have been trying to get this 6.0 w/ TR224 cam and BBK headers to fire. First, I had a fuel issue. It wouldn't hold pressure at all once the pump was off. After many hours of searching I found a broken o-ring on the fuel pressure regulator in the tank.

With the pump on it is now roughly 57 psi, drops to 50 when it turns off and holds well. I tried to fire it on the stock LS1 tune yesterday and it would light right up on ether but only a couple cylinders would pop on just gas. That evening I went out to pick up EFIlive from a guy on MAEG. Very cool of Darius to lend it to me

I took the 98 Z28 tune and adjusted the cylinder volume to 746. I transferred over a MAF table from a 2002 Z06 because I'm using a 85mm truck MAF. I copied the VE table from a 2004 LQ4 Cargo Van just to see if it would help. Injector flow table was copied from a 2000 Z28 to match the injectors I have (12555894). EGR, AIR, and rear 02's are disabled. I don't see any reason why this wouldn't get the engine running.

I keep coming back to plugged injectors every time I try to think it over, but that's a good chunk of coin I didn't plan on spending. I'm getting a little bummed

Thoughts?

[jakes_GSXR]

cam off?

[sman]

There is not vats or security issue right?

Was this originally a v6 car? If it was did you run power to the coils on the passenger side?

Are you getting spark?

That tune, or even a stock Z tune should get it going.

I know 98s are weird. Its a 98 engine harness right? 98 computer as well?

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[hoogiesngrinderz]

Cam was done correctly when engine was going back together.

Car is a Z28. Harness and PCM are 98. VATS shouldn't be an issue, but I can tune it out to see what it does. It just doesn't get going without ether.

I'll post up a video up in a minute. I don't have a clip of the ether start, but it's the typical quick 1 to 2 second run.

[hoogiesngrinderz]

First crank I didn't give it any throttle. Second crank was probably 50% just to get it off the starter. It has to be fuel related. I can pump the tank dry and fill with fresh, but the stuff I took out the other day ran the John Deere perfectly fine

[sman]

Does it even stumble when trying to start on gas?

Do you have a noid light to see if the injectors are being signaled to fire? Have you tried removing the rail and injectors and see if they spray when you crank it?

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[hoogiesngrinderz]

I can get it to run on a couple cylinders by holding the throttle around 50-75%

One thing I do not have is a noid light. I've used a test light probe in the past on TPI systems to check for pulse.

Tomorrow after work I will lift the fuel rail and injectors. Doing all this by myself is a bit difficult.


I just remembered that I made and injector test rig with an old connector I had. I can bypass the fuel pump relay and fire each injector individually when I'm right next to it.

If it does come down to getting different injectors I guess I can't complain too much, 24# (@58psi) injectors would probably come close to maxing out with this setup

[sman]

If you end up needing new ones, I have a 2 year old set of GM 28.6 LB (or whatever they were, the bigger ls1 injectors) came on a brand new LS6 intake I bought from the Dr. I am putting my 42s in this week.

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[sman]

Did you check both the inj1 and inj2 fuses?

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[hoogiesngrinderz]

Did you check both the inj1 and inj2 fuses?

All fuses in FRC 1 & 2 are good. Let me know a price on those inectors, I'm going to start looking around now so I can get them ASAP if need be. I only have a week (maybe two, if I beg) with EFIlive before it goes back.

[WMCCjames]

Will it run off of carb cleaner?

[sman]

Make an offer, no idea what they are worth.

Yes, he said it ran off of either/starting fluid.

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[hoogiesngrinderz]

I'll see if I can reverse flow these.

I can get a set of rebuilt 36# for $159 shipped. I'll have to think it over and get back to you with an offer...the money I have set aside now was for suspension and interior :/

[Virtue]

a crude method you could do to see if they are firing, pul the injectors out of the intake, crank the car over with some cardboard under the rail/injectors so fuel doesnt go everywhere. I'd have someone else crank the car over so you can see if/how the injectors are firing. Had to do this once in highschool when a injector harness got messed up.

[masterfab]

Are you using hp tuners? Send me the tune file. it sound like what I went threw. it was combination of maf not turned of correctly and the injector flow rate being wrong do to the wrong Injectors being sent. I know your using maf so that's not the issue.

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