96 7.3 Cold Start issue - Ford Powerstroke Diesel Forum
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Old 02-13-2014, 11:04 AM
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96 7.3 Cold Start issue

1996 F250 7.3 Powerstroke

Starts fine if warm or was plugged in.

I ordered a autoenguity scanner that will be here tomorrow so that I can check codes etc. I realize that the tool can perform a lot of testing.

What tests should I run to zero in on the problem.

What i have done so far before I got stuck


Replaced GPR
OHM tested the glow plugs
replaced CPS with a motorcraft CPS
followed instructions for removal and cleaning of the IPR
Load tested the batteries.

Read over and over forums

I get some white smoke from the exhaust while cranking.
rpm guage does seem to read about 400 ohms while cranking

Just looking for some direction on how to proceed or what to post back after i get the tool. Dont want to spend 2 days playing with the tool trying to figure out what I should be testing.

Thanks in Advance
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Old 02-13-2014, 01:28 PM
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If it were me I'd replace the glowplugs if I didn't know the history of the truck .
I have had two of these and both needed new plugs to start in the coldest weather after I purchased them .
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Old 02-13-2014, 05:20 PM
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check glowplug harness ends, one could be burn`t they are known for that.
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Old 02-14-2014, 04:43 AM
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I have went through the harness and measured the resistance accross each glow plug and tested the wires from end to end. I guess I will wait for the autoenguity box to get here today and get some recommended tests to continue troubleshooting with that today.
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Old 02-14-2014, 05:07 AM
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Your tachometer displays ohms?... :

What resistance did you get on the glow plugs?

Did you test the relay, and if so how? How long are you letting the relay run? If it's cold where you are, and it's not plugged in, you need to let it run longer than the WTS light. Just do a ten-count after the light goes off, then trip the key.

Relvant things to check on AE - EOT (oil temp), glow plug cycle time.

Last edited by madpogue; 02-14-2014 at 07:45 AM.
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Old 02-14-2014, 05:37 AM
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got about 1 ohm accross the glow plugs plus or minus just a little. I tested the relay by checking voltage on both of the big lugs on the new relay used a GPR109 from napa till i get a stancor in to replace it. 1 side of lug hot all the time other side goes hot when the relay engages. I also installed an led on the dash to show me how long the glow plugs are getting power from the relay. they seem to stay on about 2 mins if its about 30 outside. I have even let them cycle through 2 full times still wont start (sounds like it really wants to) but just does not quite catch.
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Old 02-14-2014, 07:45 AM
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Okay, test the relay again, but this time, measure the voltage, down to the tenth of a volt, at BOTH big terminals, AFTER turning the key to RUN. If the DIFFERENCE between them is more than 0.3, it's still a bad relay, even if it's "closing".

Two minutes is about right; that indicates that the PCM is timing the relay properly. So that rules out the EOT or bad PCM programming.

One other thing you might do is check for voltage at the UVCH connectors. Pull all four connectors, key in RUN, check the outermost pins on each connector. Should be about the same voltage as what you get at the relay.
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Old 02-14-2014, 05:38 PM
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do you know what kind of glow plugs are in the truck, hope there not bosch. they can cause problems on cold starts.
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Old 02-14-2014, 10:46 PM
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okay Tested the Relay again voltage drop was about .2 volts drop. I check at the harness in the morning. As far as the other question about the type of glow plugs do not know as of yet.
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Old 02-15-2014, 04:07 AM
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Okay adding some info here. Bear with me still figuring out this autoenginuity tool.

getting about 2900 psi on the injector control while cranking and about 48% duty cycle on the injector control while cranking cold. Oil temp is 41 deg which is about what it is outside.

rpm is about 130 during the cranking
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