Intermittent problem - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 01-09-2013, 09:06 AM Thread Starter
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Intermittent problem

I'm having an issue that comes and goes. Cannot go in reverse. Forward gears work but high RPMs before shifting like it's in limp mode. No trouble codes are thrown. When the problem goes away everything is normal. Lets say there is nothing wrong with the transmission. Where would I start to look for this issue? Could this be an ECM issue?

96 F350 4x4 XLT 7.3 59,428 orig miles, Stage I's, Adrenaline, IDM, gutted EBPV, Tymar intake, Banks intercooler, downpipe, gauges, TW 4 position chip, John Wood Towmaster, Ford 08 diff cover, Oil gauge mod, Electric fuel conversion, RSK, OH console, Durn cat done run off an I can't find it.

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post #2 of 6 Old 01-10-2013, 03:17 PM Thread Starter
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This is getting frustrating! Got home last night and started it up. Put it in reverse and backed out of the driveway no problem. Took it for a drive and everythings working normally. Not sure how to troubleshoot an issue like this that comes and goes. Does this sound like an electrical or mechanical issue?

96 F350 4x4 XLT 7.3 59,428 orig miles, Stage I's, Adrenaline, IDM, gutted EBPV, Tymar intake, Banks intercooler, downpipe, gauges, TW 4 position chip, John Wood Towmaster, Ford 08 diff cover, Oil gauge mod, Electric fuel conversion, RSK, OH console, Durn cat done run off an I can't find it.

It is better to have a lobster on your piano than to have a crab on your organ
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post #3 of 6 Old 01-10-2013, 03:56 PM
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Next time it doesn't go in reverse, if you're lucky enough to have an assistant with you, (or if it's dark enough), have your assistant hop out and see (or look in the mirror to see) if the reverse lights are on. If they're not, it may be a problem with the range selector/sensor, aka MLPS, aka neutral safety switch. It may be faulty or out of adjustment. That or slop in the steering column. In either case, the PCM doesn't "know" that the tranny is in reverse.

How did you determine there are no codes? What scanner did you use?
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post #4 of 6 Old 01-10-2013, 04:10 PM Thread Starter
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Quote:
Originally Posted by madpogue View Post
Next time it doesn't go in reverse, if you're lucky enough to have an assistant with you, (or if it's dark enough), have your assistant hop out and see (or look in the mirror to see) if the reverse lights are on. If they're not, it may be a problem with the range selector/sensor, aka MLPS, aka neutral safety switch. It may be faulty or out of adjustment. That or slop in the steering column. In either case, the PCM doesn't "know" that the tranny is in reverse.

How did you determine there are no codes? What scanner did you use?
I checked that my reverse lights come on when I put it in Reverse. I tried rocking the shifter but it is solid. I used Auto Enginunity. Actually there was one code stored but it was for disconnecting the batteries awhile back.

96 F350 4x4 XLT 7.3 59,428 orig miles, Stage I's, Adrenaline, IDM, gutted EBPV, Tymar intake, Banks intercooler, downpipe, gauges, TW 4 position chip, John Wood Towmaster, Ford 08 diff cover, Oil gauge mod, Electric fuel conversion, RSK, OH console, Durn cat done run off an I can't find it.

It is better to have a lobster on your piano than to have a crab on your organ
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post #5 of 6 Old 01-10-2013, 11:13 PM
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I have AE, but don't have access to an automatic truck to try it in. I _think_ you can get it to read what gear the tranny is in. Again, the trick will be having the AE program running and checking the next time it happens. IIRC, just browsing the EVTM one day, there are separate contacts and terminals on the trans switch for telling the PCM what gear it's in, separate from the reverse lights and neutral safety. So it may still be that the PCM is not aware it's in reverse.
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post #6 of 6 Old 01-11-2013, 09:16 AM
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