LS3 - first start - no fuel

[andrewb70]

grounds are good. and I have verified there is power to the coils. I haven't verified the plugs are actually sparking, but there is fore sure zero gas entering the cylinder.

Just making sure! This is a common problem.

Hopefully your injectors get unstuck...

Andrew

[Zachalanche]

Just making sure! This is a common problem.

Hopefully your injectors get unstuck...

Andrew

Thanks. I hope so too. Based on what a new set cost I must have gotten a free engine with the last set.

[andrewb70]

Thanks. I hope so too. Based on what a new set cost I must have gotten a free engine with the last set.

Look towards the end of this thread:

http://ls1tech.com/forums/conversion...ogress-15.html

Doug recommends an injector cleaning and flow service that was reasonably priced and did a good job. May be worth it...

Andrew

[Zachalanche]

My fuel gauge fitting showed up. I tested the pump, in one prime it maxed out the 100 psi gauge and held pressure. I Uncapped the regulator and reinstalled the return line and measured 65psi at the fuel rail. Gauge may not be the most accurate but that's pretty close to what I am aiming for.

Freed up all but 1 injector, so I figured I'd see if the thing would even start......and nope. I got a couple of deep exhaust backfires, which I would say is a step closer. so now I'm wondering if I have a timing / reluctor issue.

[andrewb70]

My fuel gauge fitting showed up. I tested the pump, in one prime it maxed out the 100 psi gauge and held pressure. I Uncapped the regulator and reinstalled the return line and measured 65psi at the fuel rail. Gauge may not be the most accurate but that's pretty close to what I am aiming for.

Freed up all but 1 injector, so I figured I'd see if the thing would even start......and nope. I got a couple of deep exhaust backfires, which I would say is a step closer. so now I'm wondering if I have a timing / reluctor issue.

Do you have any software that will allow you to monitor cam and crank signals while cranking? Here is the injector cleaning guy...

His name is Eric Derr.
DERR Injector Service
[email protected] (502) 381-4678

What the history of this engine?

Andrew

[Zachalanche]

Do you have any software that will allow you to monitor cam and crank signals while cranking? Here is the injector cleaning guy...

His name is Eric Derr.
DERR Injector Service
[email protected] (502) 381-4678

What the history of this engine?

Andrew

I contacted Eric. He helped me with some troubleshooting and I was able to verify I had not compromised the coil on my injector that won't open. His services also sound like a screaming deal compared to the thought of replacing all...or even any of these. So Ill be sending the injectors out soon. that should help a bit. Even the ones that work now- I'm not so sure function exactly how they should.

[Zachalanche]

Don't have the software. I also have not noticed rpm registering while cranking which could be a red flag.

This is a (ls3) 418 stroker from prodigy customs. Could be the last thing they sucessful delivered before going Awol. I feel pretty fortunate I got any thing for my money.

Everything looks pretty good from the outside, and I was able to verify that it has a stroke long enought to be the engine I think it is. Beyond that, anything is possible.

[andrewb70]

Don't have the software. I also have not noticed rpm registering while cranking which could be a red flag.

This is a (ls3) 418 stroker from prodigy customs. Could be the last thing they sucessful delivered before going Awol. I feel pretty fortunate I got any thing for my money.

Everything looks pretty good from the outside, and I was able to verify that it has a stroke long enought to be the engine I think it is. Beyond that, anything is possible.

Are the cam and crank sensors new? What tune? What harness? Which ECU? DBW? What pedal? Throwing any codes?

Sorry if I already asked that before. Just trying to help.

Andrew

[Zachalanche]

All sensors new, everything is gmpp with whatever tune comes with that. haven't checked codes yet but that seems like it's next on the list at this point.

The help is welcome, keep it coming.
Cheers.

[Zachalanche]

Ay thoughts on this?:

https://www.amazon.com/Bluetooth-Rea...artphone+cable

would be convenient if it works.

[csouth]

Ay thoughts on this?:

https://www.amazon.com/Bluetooth-Rea...artphone+cable

would be convenient if it works.

Personally I would buy a real scanner it will definitely come in handy with an LS motor.

[Zachalanche]

Ok i rented a scanner to see if I could see any codes, or measure crank speed. Plugged it in and cranked the engine, and it fired right up. Tried again. And it had a little more trouble, so it's not 100%. Checked the codes and I'm getting a cam sensor out of range.

I me around with the plug to the cam sensor, and noticed the fuel pump would run every time I plugged it in. Not sure if that's normal or not.

Also need to do something with my injectors soon. One of them still doesn't work.

[csouth]

Ok i rented a scanner to see if I could see any codes, or measure crank speed. Plugged it in and cranked the engine, and it fired right up. Tried again. And it had a little more trouble, so it's not 100%. Checked the codes and I'm getting a cam sensor out of range.

I me around with the plug to the cam sensor, and noticed the fuel pump would run every time I plugged it in. Not sure if that's normal or not.

Also need to do something with my injectors soon. One of them still doesn't work.

Did you try applying power directly to the single injector to see if it pulses?

[Zachalanche]

Did you try applying power directly to the single injector to see if it pulses?

yes. I removed everyone of them and did this. starting with a 9V battery. none of them moved at first. I managed free up 7 of them through various tactics. The one that still doesn't work ended up with the full 12v applied, while smacking it with a screwdriver handle, while putting back pressure on it. I'm worried that I may have cooked the coil on this one, but I started out gentle, and worked my way up to abusive when it wouldn't free.

knowing that I had 7 out of 8 functioning, I put them all back in just to see if the engine would fire. Not ideal, but I didn't want to spend a bunch of money on injectors before finding out if I had any other issues. Which now I know, I do.

[andrewb70]

Zach,

In post 27 I posted contact info for injector cleaning service. Give the guy a call, apparently he is a talker.

I've used the obd BT adapter and Torque and it works well. Pretty handy.

So let me get this straight. Ignition in run, fuel pump primes. You then unplug the cam sensor, plug it back in, and fuel pump primes again? Every time?

Andrew

[Zachalanche]

Zach,

In post 27 I posted contact info for injector cleaning service. Give the guy a call, apparently he is a talker.

I've used the obd BT adapter and Torque and it works well. Pretty handy.

So let me get this straight. Ignition in run, fuel pump primes. You then unplug the cam sensor, plug it back in, and fuel pump primes again? Every time?

Andrew

yes, planning on calling on the injector cleaning service. thanks for the contact info.

As far as BT adapters go, I'm still thinking about getting one. that one I linked above seems ridiculous cheap, but it has way better reviews than the one that sells for $100 at the local auto parts store. I guess for $13 its a pretty low risk purchase.

and, yes ignition in run, fuel pump will prime every time the cam sensor is plugged back in. - just forgot to turn the ignition off when I went to check the plug to se if it was engaged all the way. so I stumbled across this phenomena. The first time it happened was right when I grabbed the plug, but hadn't unplugged it yet. This has me wondering if I have a connection issue. no wires appear to be damaged, neither does the plug. no bent pins, etc.

I plugged it back in, cleared the codes and ran the engine again briefly (I have to apply the gas to get it to start now btw). Performed one more scan, and the same cam sensor code came up as pending. it wasn't stored yet, but there's obviously something going haywire with the cam sensor or its wiring. The scanner did not show this code as pending prior to running so I don't think this is a issue where the pins are swapped in the plug.

[andrewb70]

What ECU are you using? Might be a good idea to retrace the cam sensor wiring back to the ECU to make sure it's pinned properly. The fact that the fuel pump primes every time you unplug the cam sensor seems weird. Could be as simple as a bad sensor.

Andrew

[Zachalanche]

I think its the E67.

[csouth]

I think its the E67.

The number is cast into the body of the ECU between the fins.

[andrewb70]

I think its the E67.

Yeah...earlier you said GMPP stuff, so E67. It's easy to tell because the E67 has 3 large plugs, not 2. Depending on the exact kit, they will have different tunes. There are many GMPP kits available for the various crate engines. Those kits are well made (I have one in the GTO) it would be odd if there was a problem in the actual harness, but I suppose it is possible.

Andrew