1994.5 - 1997 7.3L Power Stroke Diesel  

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Old 12-19-2015, 08:21 PM
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not running

okay folks, got my WTS fixed so now it's time to figure out the next problem. The truck is cranking normally but won't run, its not producing any smoke while cranking. I disconnected the GPR system and tried to get it to run with fluid and it didn't even attempt to fire. I reconnected the GPR and tried to start it normally and nothing.so where should I be looking to correct this problem IDM ?
 
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Old 12-19-2015, 08:43 PM
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What was the issue with the WTS light? Any particular reason you haven't posted an update to those who helped you in that thread?

Did you try bypassing the GPR to run the glow plugs?

Does the tach move when you crank it?
 
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Old 12-19-2015, 09:08 PM
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Originally Posted by madpogue
What was the issue with the WTS light? Any particular reason you haven't posted an update to those who helped you in that thread?

Did you try bypassing the GPR to run the glow plugs?

Does the tach move when you crank it?
tach is working fine. I disconnected the power going to the glow plugs so I could use starting fluid to get the engine to compression fire
 
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Old 12-19-2015, 09:11 PM
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If it won't fire on SF it's time for a compression test
 
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Old 12-19-2015, 11:17 PM
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^^^What he said, if it don't even attemps to start with SF, most likely compression, timing, or your missing injectors are missing
 
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Old 12-20-2015, 07:59 AM
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When the truck was running,it didn't smoke,had plenty of power and wasn't burning oil.
What are the steps and tools required by to compression testing a powerstroke?
 
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Old 12-20-2015, 08:36 AM
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There are lots of threads on doing a compression check.
 
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Old 12-20-2015, 09:42 AM
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Pop the vc's off. Pull the glow plugs out. And away you go. You will Need a compression tester for a diesel (500psi will do) and the adapter to fit the 7.3. It's a tough one because the rock arm gets in the way of the universal adapters. Some guys have made an adapter out of an old glow plug though.
 
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Old 12-20-2015, 11:03 AM
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The 7.3 adapter that comes with most kits is for a idi. You need one for a psd. I got mine from MAC Tools
 
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Old 12-20-2015, 11:06 AM
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Old 12-20-2015, 11:13 AM
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I am about to pull the VC's. I have a diesel compression tester and I have an adapter that looks like a glow plug from a 7.3 IDI motor. Is this the adapter your talking about? I was wondering if it could be an IDM issue? I have a 95 model truck and I have a replacement IDM from a 97.Are they the same IDM? Something else came to mind.I know it's possible on a gas engine to "wash" the cylinders out using starting fluid I have had to wet test cylinders before to restore compression. A ny thoughts ? I let someone borrow this truck for six months, I got it back in this condition and I know they used a ton of starting fluid on it,empty cans in the bed of the truck
 
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Old 12-20-2015, 11:27 AM
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The adapter for the idi hits the rocker arms.
You can try the idm but like I said if it won't fire on starting fluid I think you have compression problems
 
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Old 12-20-2015, 12:06 PM
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IDM's are the same, swap them to see if it starts.
 
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Old 12-20-2015, 12:53 PM
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Originally Posted by therigwelder
I let someone borrow this truck for six months, I got it back in this condition and I know they used a ton of starting fluid on it,empty cans in the bed of the truck
I think I just figured out your problem

I agree with Mike. Starting fluid will ignight at a pretty low compression too so if it won't fire off that everything else could be perfect and it still won't go. That being said it only takes a few minutes to swap idms to see
 
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Old 12-20-2015, 02:41 PM
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I swapped out the IDM and still nothing. As everyone has said the adapter I have for my compression tester is to short.anyone know how to make one out of an old glow plug? For S&G I removed one GP at a time and spun the motor and heard compression.no way to judge how much or if it's enough to fire the motor.
 


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