Used motor, no start
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Tuned
Joined: Jul 2017
Posts: 294
Likes: 26
Used motor, no start
Having a heck of a time getting this truck started. Got them used motor from a guy that I buy parts from and so i have little doubt he has it running before removal but been sitting a while.
Couple things we had to do - replace eot and icp. Replaced valve cover gaskets. Shimmed injectors. Replaced the fuel spring and filter. New oil and oil filter.
Buzz test is solid post shim, no errors
we have icp bumping as high as 2000 verified by analog gauge
ipr is running fairly high to maintain pressure but we have actual oil pressure.
we have fuel running up to 50 psi (seems little low for new spring) but 50 should start it
Valve covers are loose and we are getting some white smoke. You can smell diesel but maybe not as much as we are used to w our other 7.3s on a cold start.
we have cranked and cranked and cranked and cannot get it to fire. Anybody w an idea, I’m all ears. Really a stumper.
Couple things we had to do - replace eot and icp. Replaced valve cover gaskets. Shimmed injectors. Replaced the fuel spring and filter. New oil and oil filter.
Buzz test is solid post shim, no errors
we have icp bumping as high as 2000 verified by analog gauge
ipr is running fairly high to maintain pressure but we have actual oil pressure.
we have fuel running up to 50 psi (seems little low for new spring) but 50 should start it
Valve covers are loose and we are getting some white smoke. You can smell diesel but maybe not as much as we are used to w our other 7.3s on a cold start.
we have cranked and cranked and cranked and cannot get it to fire. Anybody w an idea, I’m all ears. Really a stumper.
Thread Starter
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Tuned
Joined: Jul 2017
Posts: 294
Likes: 26
When icp hits 500, it acts like it wants to start. I I wouldn’t say it stutters but the revolutions jump and it sounds like a typical hard start 7.3 w glow plugs that have outlasted their usefulness. but, we spray just a tad bit of ether to it and it normally one of these trucks will start. It just isn’t.
We have it in a warm shop. Eot is sitting at 61 degrees. Glow plugs come on. I’m getting hot to the gp side of the relay. I’m sure they are not 100% but 61 degrees isn’t bad. We certainly start the hard starters out in the cold w a little ether and they kick right on.
7 and 8 are a little faint sounding vs the rest the buzz to touch a little faint as well. The rest are loud and I can feel them buzz well. May have needed to add another shim to them. But that is also something that usually won’t keep a truck from starting. Can’t help but think we have some white smoke but it just doesn’t seem like the cloud we get when we have a hard cold start. It’s not billowing out like the rest have been these recent few cold days.
what’s the chances I get good buzz tests but the injectors (some) just aren’t pushing fuel?
We have it in a warm shop. Eot is sitting at 61 degrees. Glow plugs come on. I’m getting hot to the gp side of the relay. I’m sure they are not 100% but 61 degrees isn’t bad. We certainly start the hard starters out in the cold w a little ether and they kick right on.
7 and 8 are a little faint sounding vs the rest the buzz to touch a little faint as well. The rest are loud and I can feel them buzz well. May have needed to add another shim to them. But that is also something that usually won’t keep a truck from starting. Can’t help but think we have some white smoke but it just doesn’t seem like the cloud we get when we have a hard cold start. It’s not billowing out like the rest have been these recent few cold days.
what’s the chances I get good buzz tests but the injectors (some) just aren’t pushing fuel?
Papa Smurf
Joined: Nov 2009
Posts: 1,078
Likes: 204
From: Woodstock, GA
Covers loose... pull them and make sure injectors are spitting oil... unplug ICP to let it go to default settings...
Open fuel drain to make sure fuel is going thru... Check Fuel bowl heater fuse.... won't start if its blown...
Not an expert, just stuff that came to mind...
Open fuel drain to make sure fuel is going thru... Check Fuel bowl heater fuse.... won't start if its blown...
Not an expert, just stuff that came to mind...
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
It won't hit on ether say's you either don't have enough heat or enough compression. An old gasser trick for starting an engine that's sat awhile is to put a cap full of engine oil in each sparkplug hole to oil the rings and bump compression. If someone were to try it on a diesel they'd want to be very carful how much oil got into a cylinder. Could get expensive real quick.
Thread Starter
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Tuned
Joined: Jul 2017
Posts: 294
Likes: 26
Using a gauge. Put a newer spring in it from a spare fuel bowl I have. Very clean. I had higher expectations than 50. Going to get under the truck take a look at the pump today.
codes - only code is u1262 scp error comes back to instrument cluster. But, I have a seat belt code that apparently comes back to the cluster based on wiring diagrams so maybe that’s causing it. I’ve swapped in spare cluster and exact same codes. Different pcm. Exact same codes. Different idm. Exact same codes.
forgot in initial to mention I’m getting 100+ rpms when cranking. It’s been a couple years since I had to work on one of my 7.3s. After I shimmed every injector I own - they all been running great so you get out of practice diagnosing this stuff.
I think I have all status required to start. I have some white smoke on cold start. Eot is 61 degrees. Just doesn’t seem to be the quantity we usually get in the others.
codes - only code is u1262 scp error comes back to instrument cluster. But, I have a seat belt code that apparently comes back to the cluster based on wiring diagrams so maybe that’s causing it. I’ve swapped in spare cluster and exact same codes. Different pcm. Exact same codes. Different idm. Exact same codes.
forgot in initial to mention I’m getting 100+ rpms when cranking. It’s been a couple years since I had to work on one of my 7.3s. After I shimmed every injector I own - they all been running great so you get out of practice diagnosing this stuff.
I think I have all status required to start. I have some white smoke on cold start. Eot is 61 degrees. Just doesn’t seem to be the quantity we usually get in the others.
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Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
150 rpm is the minimum cranking speed for the pcm to fire injectors. Maybe need to charge the batteries and/or hook some cables up to give it a boost. I still say plug it in also. What's it going to hurt? Might help though.
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Thread Starter
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Tuned
Joined: Jul 2017
Posts: 294
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believe that’s 150 on a 6.0. I think min on a 7.3 is 100.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
You may be right, I've never actually tested the minimum cranking speed. Only parroting what's shared here. Either way here's the "No start flow chart" from the tech section. Sometimes you just gotta go back and start with the basics.
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Tuned
Joined: Jul 2017
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Truck finally running
We went to extremes. We got the block and eot all way to 100. Out a new starter in it. Ran new starter wires. 2 new batteries. new ipr. All new injector o rings and each was shimmed. New valve cover gaskets. New glow plugs. It’s winter here so we went ahead new oil and filter starting out 10w30 maybe lighter oil clean this motor up some on inside. New fuel filter. New fuel spring. (Not all at once)
final straw was the heating up the block and new starter. Gave us the revolutions needed to get it to start. Plus little puff of ether. It wouldn’t start wo the ether. First couple mins all that oil in cylinders burned off. Smoked out the neighborhood.
Let these motors set and injectors get mucked up and oil gets gooey. The old fuel spring was rusty wouldn’t come out of the plunger. when u get to the end of the flow chart and your truck still doesn’t start - sometimes you just have to go the extra mile.
final straw was the heating up the block and new starter. Gave us the revolutions needed to get it to start. Plus little puff of ether. It wouldn’t start wo the ether. First couple mins all that oil in cylinders burned off. Smoked out the neighborhood.
Let these motors set and injectors get mucked up and oil gets gooey. The old fuel spring was rusty wouldn’t come out of the plunger. when u get to the end of the flow chart and your truck still doesn’t start - sometimes you just have to go the extra mile.
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