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Old 01-17-2011
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Major Overdrive Malfunction

I don't even know where to start on this one. My truck drives fine, it runs like a top, the only thing is when I want to really mash the skinny pedal, it does nothing. Like I said before, the truck drives perfectly fine in ALL gears. It shifts fine and everything, it's only when I get into overdrive that it malfunctions. What happens is, the truck sounds like it's in overdrive except the RPM's stay at about 3500-4000 and the truck begins to shake. I don't even know where to start on this issue so I am hoping you guys can help me out. Thanks in advance.
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Old 01-17-2011
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Overdrive !

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Originally Posted by Giraffe02 View Post
I don't even know where to start on this one. My truck drives fine, it runs like a top, the only thing is when I want to really mash the skinny pedal, it does nothing. Like I said before, the truck drives perfectly fine in ALL gears. It shifts fine and everything, it's only when I get into overdrive that it malfunctions. What happens is, the truck sounds like it's in overdrive except the RPM's stay at about 3500-4000 and the truck begins to shake. I don't even know where to start on this issue so I am hoping you guys can help me out. Thanks in advance.
Hi , Your computor is holding your r.p.m.'s @ 3500 due too your overdrive clutch pack clutches being worn out . Push the overdrive button to lock out the overdrive till you take it to the repair shop as you need an overhaul to the overdrive clutch pack . Sounds like overdrive is completely fried . My Thoughts Bud
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Old 01-17-2011
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Wow, thanks a lot. Finally someone replied. Do you have an estimation as to how much this would cost me? Being only 16, I'm a little tight on cash.
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Old 01-17-2011
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Hi ,if your short on cash just leave the trans in drive each time you start . Push the button to lock in drive each time you drive off . You'll burn more gas , but you'll be riding fine . My thoughts Bud
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Old 01-17-2011
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I think I know where this problem came from but I just want to make sure. When I had my truck misfiring, it was doing a top speed of about 20 M.P.H. which I believe was in O/D. Now, I drove to school and home with the truck misfiring and then to my friends house to work on it. I probably did a total of about 20 miles almost all of it was using O/D because that's the only way it would go anywhere. Now I'm just guessing that this would cause my O/D clutch pack to wear out. Is that correct?
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Old 01-17-2011
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your O/D is the extension off your tranny. It simply enable you to cruise at higher speeds at lower RPMs therefore less fuel is burned at the cost of torque. Turn O/D off and just ride with it. you wont lose that much in MPG at all. IDK how much O/D units run but if you scrapped your current one and bought one out of a yard then youd be set
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Old 01-17-2011
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So in theory, I could just replace the entire O/D unit?
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Old 01-18-2011
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Alright so I just got a new boat-load of information about my problem. So it turns out, that the problem isn't with my O/D. I wasn't clear enough when I was describing my problem. What is happening is, when I put the gas pedal to the floor, the car doesn't accelerate. I have asked multiple people about this and I have heard about 4 different things.

1. MAF Sensor
2. Throttle Position Indicator
3. Fuel Filter Clogged
4. Bad Transmission

I am hoping to hell it's not the last one. Does anybody have any other ideas or suggestions as to what I can do to eliminate possibilities and/or solve the problem?
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Old 01-18-2011
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Hmm. I guess nobody knows what it could be. I guess I'll just drive around without mashing the gas pedal...
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Old 01-18-2011
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You need to be patient, not everybody is on here all the time. If you have a check engine light on you need to get the trouble codes read, autozone does it for free. My guess is a bad coil or you ran it low on oil and the timing chain jumped.
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Old 01-18-2011
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Sorry, I am just getting frustrated with this issue.The CEL is not illuminated. I guess I could have the code read anyway. I have not ran it low on oil and I don't think the timing chain has jumped. It runs perfectly except for when the gas pedal is on the floor.
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Old 01-18-2011
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If your running it with the gas pedal all the way to the floor (which there is absolutely no reason to do) then the transmission isn't using overdrive because your asking for acceleration!
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Old 01-18-2011
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Quote:
Originally Posted by pcollins View Post
If your running it with the gas pedal all the way to the floor (which there is absolutely no reason to do)
I've encountered plenty of times where my skinny pedal is as far as it will go did it today, passing someone, actually. with my o/d off, haha. I never use o/d unless I'm cruising above 60-65ish. and when you live where I do, its all back roads that you cant drive over 65ish haha.
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Old 01-19-2011
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Start with the easy stuff. Do your fuel filter and the TPS and go from there. You can pick up a new TPS for $30-$45 and a filter is like $20. Could be a cheap fix.
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Old 01-19-2011
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Thanks, I think that's what I'll do. I'll replace the TPS, clean out the MAF and my intake, and replace my fuel filter. If that doesn't fix it, I'll just let her lie because she's drivable as she sits.
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Old 01-19-2011
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your engine should jump down a gear no matter if your MAF isnt in proper working order. The ECU will not be able to detect % of O2 entering the engine so to compensate your ECU will dump fuel above and beyond the preset mixture just to be safe. this will kill MPG (-2 or -3) but should not mess with gear jump function. I would definitely say fuel line filter or what I said originally. your tranny and your O/D unit are separate parts just connected. the loss of a gear jump function shouldn't cause you to buy a new tranny. otherwise just look into a new O/D unit. ive never replaced one but the process looks pretty straight forward
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Old 01-25-2011
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It does jump down a gear but then stays at about 3500 RPMs. I have replaced the fuel filter and cleaned the MAF. I seem to be having the same no acceleration issue. I should also add that when it goes into 2nd and 3rd gear it revs up to 4000 RPMs and won't shift unless you let off the throttle a little bit. My only other ideas before transmission issues are TP sensor and vacuum leak. I have looked around and felt for a vacuum leak and haven't found one yet but sometimes they can be sneaky.
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Old 01-25-2011
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Not sure if you know this, but you can spray carb cleaner around/on your vaccuum lines, intake manifold, etc. with the truck running. If it starts to rev higher, you found your leak.
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Old 01-25-2011
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When was the last time you changed your trans fluid and filter? Test the tps before replacing use a ohm meeter and check for a steady increase in resistance there should be no jumps or dead spots is you find there is you have most likely found your problem. Next would be the fuel filter pull the spark plugs and check them out they could be dirty. Also pop open the hood on a good dark night with the lights off and engine running and look to see if you have a light show coming from your plug wires.
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Old 01-25-2011
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Quote:
Originally Posted by powerranger262 View Post
Not sure if you know this, but you can spray carb cleaner around/on your vaccuum lines, intake manifold, etc. with the truck running. If it starts to rev higher, you found your leak.
Yeah I meant to try that tonight, but I ran out of time. I guess I'll just do it tomorrow.

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Originally Posted by 87xlt View Post
When was the last time you changed your trans fluid and filter? Test the tps before replacing use a ohm meeter and check for a steady increase in resistance there should be no jumps or dead spots is you find there is you have most likely found your problem. Next would be the fuel filter pull the spark plugs and check them out they could be dirty. Also pop open the hood on a good dark night with the lights off and engine running and look to see if you have a light show coming from your plug wires.
There are marks under the hood that say " Fuel, Trans, and Brakes - 29k" I assume this means fuel filter, trans filter & fluid, and brakes. Now the truck has almost 60k so I assume it needs new ATF and a new filter. The fluid is actually above the full mark on the dipstick and is a dark amber color. It doesn't smell burnt, it just smells like manure, which I am just assuming is normal. I don't have an ohm meter but I'll look into doing that when I get my hands on one. I have just changed the spark plugs and the wires have no sparks jumping off of them. I just checked that before I put the truck away.

Thanks a lot for your guys' responses. I'll keep ya'll updated on the progress.
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