ls1 guru needed cant get her started
05-19-2014, 08:55 AM
#1
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ls1 guru needed cant get her started ok guys heres what i got.
5.3l l33
ls6 intake and cam
ls1 throttle body
vats deleted/ basic swap ready tune the on PCM. nothing fancy
50psi at the fuel rail
good spark on all plugs
24x crank sensor
120psi compression on all cylinders(engine is fresh rebuild)
no codes
i even tried a little starter fluid
all my bat 12v and ign 12v have been verified
i did use the map sensor from the l33, but i am gonna swap it for the ls1 today, because i read about a guy having similar issues.
the engine will sputter and pop but i can get her to run. i have been through the harness a bunch and check all my grounds. i have attached a vid showing the compression test with spark plug firing. i was thinking maybe my timing was off.
also cylinders 2&4's plugs are black and the rest look like the pic i attached.
i am running out of ideas on this and any help would be awesome!
sorry about the link ls1tech would not just let me put up the vid.
http://www2.snapfish.com/snapfish/sl...NAME=snapfish/
5.3l l33
ls6 intake and cam
ls1 throttle body
vats deleted/ basic swap ready tune the on PCM. nothing fancy
50psi at the fuel rail
good spark on all plugs
24x crank sensor
120psi compression on all cylinders(engine is fresh rebuild)
no codes
i even tried a little starter fluid
all my bat 12v and ign 12v have been verified
i did use the map sensor from the l33, but i am gonna swap it for the ls1 today, because i read about a guy having similar issues.
the engine will sputter and pop but i can get her to run. i have been through the harness a bunch and check all my grounds. i have attached a vid showing the compression test with spark plug firing. i was thinking maybe my timing was off.
also cylinders 2&4's plugs are black and the rest look like the pic i attached.
i am running out of ideas on this and any help would be awesome!
sorry about the link ls1tech would not just let me put up the vid.
http://www2.snapfish.com/snapfish/sl...NAME=snapfish/
Last edited by drift donkey; 05-19-2014 at 09:07 AM.
05-19-2014, 09:00 AM
#2
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here is a link to my facebook for the vid. damn internet cant get **** right.
https://www.facebook.com/paul.irwin.3726
https://www.facebook.com/paul.irwin.3726
Last edited by drift donkey; 05-19-2014 at 09:06 AM.
05-19-2014, 10:47 AM
#7
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Got the pinouts for sure. I have checked them at least 10 times. Timing set is installed as per FSM. If the new map sensor doesn't work I will check the injectors next. I can't do a crank relearn, because the engine will not run:/
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05-19-2014, 10:54 AM
#8
Crank relearn has nothing to do with engine starting and running correctly.
Check for fire
Use noid light to check for injector pulse on all 8
Verify fuel pump is powered while cranking
Use a scanner and fuel pressure gauge to perform drop test on injectors.
Unplug MAF and try starting with maf dead it reverts to basic speed density.
Check for fire
Use noid light to check for injector pulse on all 8
Verify fuel pump is powered while cranking
Use a scanner and fuel pressure gauge to perform drop test on injectors.
Unplug MAF and try starting with maf dead it reverts to basic speed density.
05-19-2014, 11:28 AM
#9
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Crank relearn has nothing to do with engine starting and running correctly.
Check for fire
Use noid light to check for injector pulse on all 8
Verify fuel pump is powered while cranking
Use a scanner and fuel pressure gauge to perform drop test on injectors.
Unplug MAF and try starting with maf dead it reverts to basic speed density.
Check for fire
Use noid light to check for injector pulse on all 8
Verify fuel pump is powered while cranking
Use a scanner and fuel pressure gauge to perform drop test on injectors.
Unplug MAF and try starting with maf dead it reverts to basic speed density.
Unplugged the maf and engine still wouldn't start. That's why I'm thinking the map from the l33 is my problem. Just popped the new ls1 map in and will try for a start.
Gonna check injectors as well.
05-19-2014, 12:39 PM
#12
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Well the new sensors didn't work. I replaced the crank and map. I also removed the valve covers a visually checked that both valves are closed at tdc when they are supposed to.
05-19-2014, 12:50 PM
#13
TECH Addict
here is a link to my facebook for the vid. damn internet cant get **** right.
https://www.facebook.com/paul.irwin.3726
https://www.facebook.com/paul.irwin.3726
Also, your compression stopped jumping after the first couple of compression strokes and continued to climb gradually. That shouldn't happen either. It should jump a few times and peak out. It shouldn't continue to climb when it's not on a compression stroke, could be your gauge though.
Also what system are you using for spark ignition? Stock 5.3L Gen 3 GM, or distributor, or something different?
Last edited by hrcslam; 05-19-2014 at 12:59 PM.
05-19-2014, 12:54 PM
#14
This is what happened to me. The ground wires from the ignition coils were not grounded properly. The engine would sometimes start and run but not good. It sometimes would not start. Sometimes would backfire. I had assumed I had spark because at times it would somewhat run.
In frustration we ran a temporary ground wire from the coils to a ground point and viola it ran like a champ. After that it was easy to find the real source of the problem.
Also recheck and make sure you have the proper firing order.
In frustration we ran a temporary ground wire from the coils to a ground point and viola it ran like a champ. After that it was easy to find the real source of the problem.
Also recheck and make sure you have the proper firing order.
05-24-2014, 02:33 PM
#15
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Something isn't right with your video. The spark should happen right after the jump in compression. And it's not happening every time either. It should be compression jump then spark immediately after every jump in compression.
Also, your compression stopped jumping after the first couple of compression strokes and continued to climb gradually. That shouldn't happen either. It should jump a few times and peak out. It shouldn't continue to climb when it's not on a compression stroke, could be your gauge though.
Also what system are you using for spark ignition? Stock 5.3L Gen 3 GM, or distributor, or something different?
Also, your compression stopped jumping after the first couple of compression strokes and continued to climb gradually. That shouldn't happen either. It should jump a few times and peak out. It shouldn't continue to climb when it's not on a compression stroke, could be your gauge though.
Also what system are you using for spark ignition? Stock 5.3L Gen 3 GM, or distributor, or something different?
As it turned out my pushrods where to long by 0.14":/ I just put in the correct length pushrods and got it to fire, but it won't stay running and backfires.
Do u think it could be the coils from the Silverado? I am gonna go over the wiring again:/
05-24-2014, 02:34 PM
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This is what happened to me. The ground wires from the ignition coils were not grounded properly. The engine would sometimes start and run but not good. It sometimes would not start. Sometimes would backfire. I had assumed I had spark because at times it would somewhat run.
In frustration we ran a temporary ground wire from the coils to a ground point and viola it ran like a champ. After that it was easy to find the real source of the problem.
Also recheck and make sure you have the proper firing order.
In frustration we ran a temporary ground wire from the coils to a ground point and viola it ran like a champ. After that it was easy to find the real source of the problem.
Also recheck and make sure you have the proper firing order.
05-24-2014, 04:37 PM
#17
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Well tried the growned, double check my fuel pressure during cranking and its at 48psi give or take, also check injector wiring with a noid light and they are flashing.
I still have no codes.
I am gonna double check my compression, but I have to spark plugs that don't look like any fuel has reached them. I might have been sold some **** injectors off the for sale area on here:/ can u say "**** off"
I still have no codes.
I am gonna double check my compression, but I have to spark plugs that don't look like any fuel has reached them. I might have been sold some **** injectors off the for sale area on here:/ can u say "**** off"
05-24-2014, 08:20 PM
#19
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I verified injectors are squirting compression looks good except on the 2 cylinders that have clean plugs. Those 2 still build to 120psi just slower then the others. I am gonna do a leak down test tomorrow.
I'm really think its timing. Maybe its my harness. I did convert an lt1 harness to ls1. I used a G Vin 2002 camaro schematic and verified with the guy that flashed my PCM that all the pinouts are same.
Or maybe its bad plug wire or coils going out.
Or is there a difference between the can sensors on a ls1 and a l33?
I am running out of ideas.
I'm really think its timing. Maybe its my harness. I did convert an lt1 harness to ls1. I used a G Vin 2002 camaro schematic and verified with the guy that flashed my PCM that all the pinouts are same.
Or maybe its bad plug wire or coils going out.
Or is there a difference between the can sensors on a ls1 and a l33?
I am running out of ideas.
