Very Strange Problem
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New User
Joined: Apr 2006
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From: Houston, Tx.
Very Strange Problem
Hey guys, My 96 has about 265k miles on it and no mods that I know of. My check engine light will come on and the RPMs will drop down to idle. I will have to lift off the throttle and press it down again to get the engine to wake back up. Also once this has happened the trans will start shifting funny. It will shift through the gears quickly to high gear even at low speeds and bog the engine down. Sometimes these shifts can be very hard too. After a while the trans will go back to normal. The problem happens more when the engine isn't warmed up good but does do it at all times. It's been doing this maybe every other day but this morning it did it like 5 or 6 time on my way to work so I turned around and came home. Don't want to be stuck in downtown Houston with a dead truck. One more thing, put the scanner on it to try and see if it threw a code and none where found. Any suggestions?
Thanks for the help
Todd
Thanks for the help
Todd
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Joined: Oct 2003
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From: MICHIGAN
Get it scanned for codes, that's the best way to pinpoint the trouble. That being said I would check the Rear Antilock Brake sensor (RABS) on the top of the rear axle may cause the weirdness you're experiencing, possibly the Throttle Position Sensor (TPS) but those are just guesses.
Remove the RABS and clean the crud off it, check the wire socket and pins for corrosion ect. re-install it and see what happens.
Remove the RABS and clean the crud off it, check the wire socket and pins for corrosion ect. re-install it and see what happens.
Post Fiend
Joined: Oct 2003
Posts: 5,903
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From: MICHIGAN
Take it to Autozone...sometimes they can scan our diesels. It depends on the guy using it. Some Actrons will work.
Each scanner maker is different. You need to ask if they are capable of scanning our diesels. Some are...some aren't.
IMO, The trouble you are are having isn't OBD specific, I believe it's the RABS, it cannot be detected through the OBD port. It sends a signal to the Programmable Speedometer Odometer Module (PSOM) that inturn sends a signal to the PCM that inturn sends signals to the tranny telling it when to shift. The RABS is magnetic and will accumulate fine metal shavings greatly reducing the signal output. If you clean the "fuzz" off of it and ake it work again.
When the RABS is bad the OD light on the shifter will usually blink, the tranny shifts hard.
Each scanner maker is different. You need to ask if they are capable of scanning our diesels. Some are...some aren't.
IMO, The trouble you are are having isn't OBD specific, I believe it's the RABS, it cannot be detected through the OBD port. It sends a signal to the Programmable Speedometer Odometer Module (PSOM) that inturn sends a signal to the PCM that inturn sends signals to the tranny telling it when to shift. The RABS is magnetic and will accumulate fine metal shavings greatly reducing the signal output. If you clean the "fuzz" off of it and ake it work again.
When the RABS is bad the OD light on the shifter will usually blink, the tranny shifts hard.
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Joined: Apr 2006
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From: Houston, Tx.
Ok, I thought about replacing the TPS because I found one for 35$. Come to find out I'm looking at the "Pedal" position sensor and thats why the parts dont look the same. DOH. I've looked all over the engine and can't find a TPS,
not to say its not there, just I dont know where to find it.(maybe it's not there, maybe it doesn't have one, only The Shadow knows) Anyway, I'm going to get a "PPS" and clean the RABS and hope that cures the problem. If it has one, should I replace the TPS also?
not to say its not there, just I dont know where to find it.(maybe it's not there, maybe it doesn't have one, only The Shadow knows) Anyway, I'm going to get a "PPS" and clean the RABS and hope that cures the problem. If it has one, should I replace the TPS also?
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Joined: Aug 2006
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Originally Posted by 96_4xStroke
Ok, I thought about replacing the TPS because I found one for 35$. Come to find out I'm looking at the "Pedal" position sensor and thats why the parts dont look the same. DOH. I've looked all over the engine and can't find a TPS,
not to say its not there, just I dont know where to find it.(maybe it's not there, maybe it doesn't have one, only The Shadow knows) Anyway, I'm going to get a "PPS" and clean the RABS and hope that cures the problem. If it has one, should I replace the TPS also?
not to say its not there, just I dont know where to find it.(maybe it's not there, maybe it doesn't have one, only The Shadow knows) Anyway, I'm going to get a "PPS" and clean the RABS and hope that cures the problem. If it has one, should I replace the TPS also?
Never heard of it causing the trans to go into limp though...
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From: THUNDER BAY
I am probably wrong but if there was a short somewhere would or could this happen,the other week I had my batteries unhooked and when I hooked them back up my truck also shifted this way.
Also I had a 91 f250 gasser that did what you are explaining and it ended up being the starter sounds silly but it was shorting out the truck it was almost like someone had flicked a switch or unhooked the batteries.
It,s probably not the problem but you never know
WALTER
Also I had a 91 f250 gasser that did what you are explaining and it ended up being the starter sounds silly but it was shorting out the truck it was almost like someone had flicked a switch or unhooked the batteries.
It,s probably not the problem but you never know
WALTER
Postmaster
Joined: Sep 2007
Posts: 4,195
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From: Medford Oregon
Originally Posted by WALJON
I am probably wrong but if there was a short somewhere would or could this happen,the other week I had my batteries unhooked and when I hooked them back up my truck also shifted this way.
Also I had a 91 f250 gasser that did what you are explaining and it ended up being the starter sounds silly but it was shorting out the truck it was almost like someone had flicked a switch or unhooked the batteries.
It,s probably not the problem but you never know
WALTER
Also I had a 91 f250 gasser that did what you are explaining and it ended up being the starter sounds silly but it was shorting out the truck it was almost like someone had flicked a switch or unhooked the batteries.
It,s probably not the problem but you never know
WALTER
