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Unread 04-17-2010, 02:19 PM   #1
clemsonfan16
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1988 YJ Wrangler 
 
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Tps?

Hey guys ill get straight to the point.

Latley my jeep has been bucking pretty hard while going down the road. It will start up every time but it wont idle good. It will go from 1000 to 200 then back up. Going down the road it will not rev sometimes when i hit the skinny pedal. Toady it officially craps out on me and wont start back up. It turns over, idles to 3000, then dies. It wont run. Its getting fuel and the vaccum hoses are pretty new. I though it might be the TPS or MAP sensor but am not 100% sure. If you know the problem and could let me know it would be greatly appreciated.

-Hunter

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Unread 04-17-2010, 02:43 PM   #2
xdgt03
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Sorry not fully up to speed on years and all but is this carborated or fuel injected. I assumed FI because you said MAP which is only on FI. So, if you have an ohm meter I would start checking the TPS, Crank position sensor, cam position sensor, and coolant sensor. All these things are read by the computer to adjust timing, fuel mixture, and injector spray timing. My manual is for a 1994.

The ohm reading are:
coolant sensor at operating temp 720 to 1340ohms

crank sensor "place ohm meter across terminals b and c at 1k-10k scale. There should be NO resistance"

Voltage readings for following sensors:
TPS at idle >200 millivolts at wide open <4.8 volts

MAP between terminals a and c ignition on and engine off approx 5 volts. 5 volts should also be at terminal 6 of PCM.

Cam sensor 5 volts. There is a procedure for this if you need it let me know.
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Unread 04-17-2010, 02:58 PM   #3
TrynPas
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did you turn the key on/off/on/off/on and pull the codes? Your problem sounds exactly like my bad TPS. I pulled the codes and it told me what he problem was.
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Unread 04-21-2010, 06:54 PM   #4
clemsonfan16
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Cool ill try the ohm meter when i go back home (Im at college) and its fuel injected.

I would try the codes but mines a little too old haha
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Unread 04-21-2010, 07:35 PM   #5
Apollo12227
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TPS definatly causes bucking in the throttle while driving... When mine went bad, it would start to lose power and slow down between 45 - 55 and I would have to completly floor it to keep it up to speed... Running 45 though it worked justfine... It's a pretty cheap sensor to replace, I would say go for it, they are driven by a little plastic gear which eventually wears out over time. Even if it doesnt fix your problem your throttle will be a lot more responsive afterwards.
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Unread 04-21-2010, 09:53 PM   #6
clemsonfan16
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Quote:
Originally Posted by Apollo12227 View Post
TPS definatly causes bucking in the throttle while driving... When mine went bad, it would start to lose power and slow down between 45 - 55 and I would have to completly floor it to keep it up to speed... Running 45 though it worked justfine... It's a pretty cheap sensor to replace, I would say go for it, they are driven by a little plastic gear which eventually wears out over time. Even if it doesnt fix your problem your throttle will be a lot more responsive afterwards.
Thanks for the post . Was wondering if ppl were having the same problems as I am. I def have to floor it to keep speeds up. Its been getting progressively worse over the past few months and now it wont start at all. Would this still be a tps problem?
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Unread 04-21-2010, 10:57 PM   #7
Apollo12227
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Well thats not good if your jeep doesnt start... TPS definatly isn't one of the "death sensors" that will prevent your engine from starting, at least I dont think it is lol. The CKP (crank position sensor) and CPS (Camshaft sensor/stator/distributor pickup) will most certainly shut the engine off like a lightswitch but a TPS wont prevent you from starting the engine from my understanding... I suppose if the sensor was really out of wack it might have the computer confused as heck right now. A lot of people will tell you to look for codes but TPS wont usually throw a code (despite whether check engine light is on or not)...
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Unread 04-21-2010, 11:01 PM   #8
clemsonfan16
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haha my jeep doesnt flash codes its too old. Yeah the jeep will turn over it just wont start. It sometimes starts and goes to 3000rpms and then dies. Hasnt done it before, just when my tps went out Im guessing
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Unread 04-22-2010, 08:37 AM   #9
Apollo12227
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Yeah well 50% of your symptoms match a TPS issue so I would definatly start there. Let us know what happens after you swap a new one in and let us know what happens lol.
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Unread 04-22-2010, 09:46 AM   #10
clemsonfan16
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Quote:
Originally Posted by Apollo12227 View Post
Yeah well 50% of your symptoms match a TPS issue so I would definatly start there. Let us know what happens after you swap a new one in and let us know what happens lol.
Will do. They are expensive little things right at about 55 bucks
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Unread 04-22-2010, 10:45 AM   #11
YJdad
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Code - 24 Throttle position sensor voltage too high or too low - Picked up a new one at Autozone for $38 bucks.
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Unread 04-26-2010, 11:55 PM   #12
clemsonfan16
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Damn looks like i need to head to Illinois to get my Parts from now on haha Looks like Im gettin ripped off in SC!

-Update
Replaced the TPS and......Nothing. Jeep wont even think about starting. Try to crank it a few times and it turns over but wont start. I look under the jeep and there is apuddle of gas. One of the gas lines that go into my throttle body is leaking. But it only started leaking after I connected it back. I didnt cross thread it and it is in there good and snug. Do these fittings need a fuel rated tephlon tape?
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Unread 04-27-2010, 08:42 AM   #13
Que89YJ
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Check your IAC. Clean the IAC and the throttle body.
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Unread 04-27-2010, 11:33 AM   #14
muddy93
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dose your jeep still have the catalitic converter? My 93 was acting like this(running rough, wouldn't rev past 2500rpm, and eventually wouldn't start). My problem ended up being a clogged cat.
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Unread 04-27-2010, 12:24 PM   #15
clemsonfan16
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Nope doesnt have it anymore. Joe will prob delete this post for me sayin that but oh well. My throttle body has been cleaned recently also. But none of those would be why the line is leaking gas now...
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