4r100 Problems Mark Kovalsky? - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 14 (permalink) Old 06-17-2015, 12:43 PM Thread Starter
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4r100 Problems Mark Kovalsky?

Just put my old 7.3 on the road and the tranny seems to be a little screwy. The tranny seems like it doesnt know when it should shift out of OD going up a hill I had to manually shut off the OD or I wasnt going up the hill it lugged the thing right down. I have had the batteries disconnected and I remember reading some where that disconnecting the batts erases the shift points and you start from scratch again. Could that be the case or something more extensive. FML
Any help is appreciated.
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post #2 of 14 (permalink) Old 06-18-2015, 01:31 AM
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Re: 4r100 Problems Mark Kovalsky?

It's something else because disconnecting the batteries does NOT erase the shift points. In fact, it doesn't do anything at all to the transmission software.

Are there any codes stored? Does the OD OFF light work? Has it flashed?

Mark
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post #3 of 14 (permalink) Old 06-18-2015, 03:05 AM Thread Starter
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Re: 4r100 Problems Mark Kovalsky?

Thank you for your prompt response. To answer your questions the light does work it flashed in the past due to a bad vss, once replaced the problem was corrected. I ran a code reader through it a while back my results were the following, PO541, P1670, PO478, P1298, PO380, PO603, F1784, PO500. I haven't ran the scanner since.
Thank you very much


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Brandon
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post #4 of 14 (permalink) Old 06-18-2015, 09:51 AM
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Re: 4r100 Problems Mark Kovalsky?

Clear the codes and drive it again to see what code(s) show back up from the existing problem

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post #5 of 14 (permalink) Old 06-18-2015, 11:38 AM Thread Starter
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Re: 4r100 Problems Mark Kovalsky?

I will borrow a scanner and report back. Thank you for the advice.
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post #6 of 14 (permalink) Old 06-20-2015, 11:44 AM Thread Starter
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Re: 4r100 Problems Mark Kovalsky?

I scanned it came back with all the codes above except for the po500 for the vss. Also the truck shifts hard for. 1-2 and 2-3 the shifts vary between rough and smooth.
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post #7 of 14 (permalink) Old 06-20-2015, 11:59 AM
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Re: 4r100 Problems Mark Kovalsky?

Did you scan it then clear the codes drive it again and scan again

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post #8 of 14 (permalink) Old 06-20-2015, 12:21 PM
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Re: 4r100 Problems Mark Kovalsky?

Also the p1670 is a communication error between the pcm and idm. That could be giving you harsh shifts. The p1298 is a idm failure code. P1784 is an internal trans mechanical failure in first and reverse. That is where I would start first. Google is an incredible entity. Definitely check your fuel pressure. That could be why its being lugged down going up hills.

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post #9 of 14 (permalink) Old 06-20-2015, 12:38 PM
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Re: 4r100 Problems Mark Kovalsky?

I recommend fixing the engine problems before starting on the transmission problems. Once the engine is fixed I think you'll find you don't have a transmission problem any longer.

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post #10 of 14 (permalink) Old 06-20-2015, 01:02 PM
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Smile Re: 4r100 Problems Mark Kovalsky?

Quote:
Originally Posted by Mark Kovalsky View Post
I recommend fixing the engine problems before starting on the transmission problems. Once the engine is fixed I think you'll find you don't have a transmission problem any longer.
That is the same as my thoughts. The engine problems are cutting fuel and the trans is over or under compensating for the poor engine performance. If my thought process is correct?

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