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Discussion Starter · #1 ·
Hello, first off let me thank you for taking the time to read this. I have a 1994 f250 7.3 idi NA turbo. When I go to start it, it will turn over once kinda sounds like ungh. I have replaced starter and solenoid, batteries read good, when I have it on the jumper to start it, it cranked 3 or 4 times.
Any ideas what to try next?

Thanks again for your time!
 

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What are you using to "read" the batteries? It sounds like one or both of them is no good. You need to disconnect them from the truck and each other and then load test them separately.


If one tests bad then replace them both. Some auto parts stores will load test for free, but a simple volt/ohm meter wont tell you the full picture. These engines need two strong 750CCA or better batteries to turn over fast enough to start.
 

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NA and turbo are mutually exclusive; can't be both.

So by "it cranked 3 or 4 times", do you mean it turned only 3-4 revolutions and would no longer crank? That sounds like extremely weak batteries. As said, LOAD test the batteries, and isolate them for the test.
 

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Discussion Starter · #4 ·
Okay, as of now i have replaced batteries, starter, and the solenoid. Yes, it sounds like three or four revolutions, but only with the fresh batteries or if the jumpers were on while trying to crank. Othewise it will do one and continually get weaker, until it no longer turns over. NA turbo meaning not available. Thanks again for your time!
 

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All of us IDI guys use NA as naturally aspirated. Turbo means exactly that, a turbo forcing air into the intake.

Where did you buy the starter? I've seen multiple failures from some suppliers.
 

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I would take it back.
 

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Yeah. Auto zone and O'Reillys starters and alternators are hit/miss.
 

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Discussion Starter · #11 ·
We have a starter specialist, that said he could get in a high torque. Would the high torque be better?
 

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It might be better if the torque isn't obtained through gear reduction as opposed to shoe/armature winding. My advise would be to get a starter from a 7.3 powerstroke. It will fit, and spins a little faster than the one from the one for the IDI engine.
 

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Discussion Starter · #13 ·
Hello, thank you again for your time, I took to a mechanic and my motor was locked up and there was water in my motor through the exhaust(I have a stack and the truck was parked down hill). The new starter was also bad. Just a follow up, thanks again.
 

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It might be better if the torque isn't obtained through gear reduction as opposed to shoe/armature winding. My advise would be to get a starter from a 7.3 powerstroke. It will fit, and spins a little faster than the one from the one for the IDI engine.
Didn't know that, thanks for that tidbit. Wonder why?
 
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