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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 05-16-2006, 06:00 PM   #1 (permalink)
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94 van overdrive light flashing

Hi, havent posted in a while but here the latest problem I have been having with my dads 94 diesel van (not powerstroke).
About a month ago the overdrive light started to blink and the transmission started to shift hard. I scanned it and it gave me rpm sensor code. Changed that but light was still there. I checked it again and now I get a flipp code (tps). I changed that and the code keeps on coming back.
Took the truck to Aamco and they said they need to rebuild the transmission, which is a load of crap.
Then I went to another tranny guy to check things out and he adjusted the flipp sensor to specs and checked for the right voltage and it was fine but he still got the code.
Went to lee myles and same thing.
They said they couldnt help me because its more of an electrical problem.
I checked all grounds, checked harness for continuity of plug to plug. No bad wires.
Lastly I went and purchased another computer as a last resort, think maybe the computer was bad, but no luck.
This sucks because I wish this sensor wouldnt affect the transmission.
Any ideas? I really dont want to take it to another "specialist" and tell me I need a new transmission [img]/ubbthreads/images/graemlins/shrug.gif[/img]
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Old 05-16-2006, 09:37 PM   #2 (permalink)
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Re: 94 van overdrive light flashing

The tach sensor and TPS are the two big problem causers...

First thing, disconnect the batteries overnight to clear the codes and reset the computer. Let's start with a clean slate.

One thing that I can think of that would put the trans into limp mode (high, hard shifts) is Torque Converter Clutch slippage. It has a code, forget what it is.

Wal-Mart had Ford code readers for about $35, you might want to pick one up to pull codes if they recur after resetting the computer.
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Old 05-16-2006, 10:46 PM   #3 (permalink)
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Re: 94 van overdrive light flashing

Try this first......

To set to specs:
With a warm engine and the idle speed set to your engine specs probably 650 in drive (curb idle).

Now with key on engine off. First connect the negative lead of a volt meter to the negative battery post, then place a paperclip straightened to slide up the side of the center wire on the FIPL for a good contact, touch the positive lead to the paperclip. Electrical connector must be connected to the FIPL.

If your FIPL requires resetting loosen the small torx screws and attempt to attain the correct setting. You can loosen the large bolts on the bracket if necessary but try to retain the centering on the FIPL/blade.

Your trying to get closed throttle voltage: 1.1 V, wide open throttle voltage: minimum of 3.8 V but not more than 4.3 V.

If you can attain those #s then tighten the screws/bolts and ensure the voltage is at the correct setting after tightening. You can also do a slow sweep of the fuel lever from idle to WOT to see if there are any blanc (dead) spots, much easier with a really $$$ meter with capture mode. If you still find there are hard shifts or very soft slippery shifts you can adjust to suit your driving but be warned slippery shifts will burn the trans up.
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Old 05-17-2006, 07:52 AM   #4 (permalink)
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Re: 94 van overdrive light flashing

I will try that cdnsarguy. The only code I get is the tps sensor saying its out of range. Before when I started to get the od light it would come and go when I hit some bumps on the road (with old rpm sensor). Without the od light on the truck shifts fine no slippage or anything, but as soon as it goes on, the truck starts to shift hard.
Thats why I dont think there is anything wrong with the tranny.
The weird thing is if I replace the rpm sensor for the old one which looks like its no good, the light does not come on right away, it takes about a couple of miles of driving to come on.
But with the new one its instantly on as soon as your turn on the truck.
I will have to try and find another code reader to see if it tells me something else.
thanks
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Old 05-17-2006, 08:07 AM   #5 (permalink)
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Re: 94 van overdrive light flashing

Yeep if you just installed the FIPL to the IP without setting it then it will be out of range 99% out of 100%.
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Old 05-17-2006, 09:03 AM   #6 (permalink)
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Re: 94 van overdrive light flashing

The only code I see that applies to the torque convertor slippage is code 62. Tim
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Old 05-17-2006, 10:25 AM   #7 (permalink)
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Re: 94 van overdrive light flashing

[ QUOTE ]
Yeep if you just installed the FIPL to the IP without setting it then it will be out of range 99% out of 100%.

[/ QUOTE ]
Well I had changed the injection pump, actually 2 times and never had a problem before with the FIPL. I marked the position it was on and it worked those two times. This problem came almost a year after I did that.
I purchased a new fipl and had a mechanic adjust it as a mentioned before, after I had that code. Maybe he messed up so I will check it again for myself and see what I come up with.
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Old 05-17-2006, 12:51 PM   #8 (permalink)
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Re: 94 van overdrive light flashing

Did the mechanic adjust the FIPL sensor with the motor hot? Resistance changes when metals are cold and hot, the sensor needs to be adjusted hot.
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Old 05-18-2006, 11:30 PM   #9 (permalink)
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Re: 94 van overdrive light flashing

i would take the plugs that hook to the tranny completely apart take the wires out of the plug one at a time clean and put back in one at a time so you dont missplace them i just cooked my one year old tranny and i think that was the culprit i had the same problems you described my plugs looked spotless from the outside but when i took them apart green corrosion every where i scraped them with a tiny straight screwdriver and a wire brush then contact cleaner then dielectric grease just got tranny back today will put in this weekend good luck
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Old 06-07-2006, 09:17 PM   #10 (permalink)
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Re: 94 van overdrive light flashing

Well it was a while but I finally solved the problem. It was the fipl sensor. The mechanic that I took it to didnt adjust it propertly and left it at .68 volts. I adjusted it to 1.07 volts and the OD light went away.
Thank you everyone for you comments and help.
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Old 06-07-2006, 10:10 PM   #11 (permalink)
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Re: 94 van overdrive light flashing

Cool, hope you didn't drive it hard while it was blinking. That's how i killed mine.

I had the exact same problem, but turned out to be the wires going to the FIPL or TPS. I replaced them, and haven't had one problem so far. Goodluck with your van, hope you don't have to adjust that tps again any time soon, it's a pain to get to.
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