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Old 05-26-2011, 07:25 PM
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Low idle and jerking on acceleration

Hi all. I have a new problem that started earlier today. My Jeep starts up fine and idles fine after being started. However when I drive it and accelerate it will start out smooth then jerk back and fourth like the power is cutting out then back to normal acceleration. While I push the clutch in to coast down the road the rpm's drop to almost zero but doesn't stall. My first thought was water in the gas tank but the check engine light is on. I took it down the road to autozone and had them plug it in and it gave the reading of a Throttle Position Sensor so I said OK and got a new one. After having installed it nothing has gotten better and the check engine light is still on, so now im at a loss on what to do.
I appreciate any help, Thanks Josh.

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Old 05-27-2011, 12:41 PM   #2
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Did you reset the CEL codes? Resetting the codes is easy, just disconnect both battery cables from the battery & touch them together. This drains the capacitor in the ECM & erases the codes in the memory. After you do that try driving it again and see if the same code coems back or if you get a different one - could be the new TPS is bad...

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Old 05-27-2011, 01:51 PM   #3
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Quote:
Originally Posted by Buddha
Did you reset the CEL codes? Resetting the codes is easy, just disconnect both battery cables from the battery & touch them together. This drains the capacitor in the ECM & erases the codes in the memory. After you do that try driving it again and see if the same code coems back or if you get a different one - could be the new TPS is bad...
I've read more than a enough times on this forum of people replacing their TPS and the new part was defective.
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Old 05-27-2011, 03:58 PM   #4
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I've replaced 3 TPS's in 3 years. I agree they can be faulty, but the symptoms you are describing sound just like my Jeep last year. I would be driving along, and the thing would feel like it's bucking for a few seconds, then be just fine. If I let it warm up too long in the driveway, it would just shut itself off. Also, when coming up to a light, I usually throw the jeep in neutral, and it would just die on me when I did that. Just shut off, and the check engine light would come on.
The difference for me though, was when I started the Jeep back up, my light would turn off. Took me months of replacing sensors, untill I finally just gave it to a mechanic who had it for 3 days and finally found it was the ECM. Guess it wasn't the original either, so it had been replaced before I had it, which was 100K ago.

Take the TPS back and tell them it's faulty. They will give you a new one. Swap it in, and then wait a day or 2 for the light to turn off. Your check engine light won't turn off right away. The computer system checks different systems everytime it is turned on, so for a full cycle or system checks, it takes like 10-15 restarts or something like that. If you keep having the problems after the second TPS is in, I would say go have your computer checked, just so you can rule that out.
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Old 05-27-2011, 08:14 PM
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Thanks for the help and suggestions guys. I took it back into auto zone and had them run it again and it threw the same tps code and after i told him the symptoms he told me that the flaps in the throttle body could be gummed up and sticking. I purchased some throttle body/carburetor cleaner took it home and blew it into every crevasse and cleaned the thing out. Now it runs like new, no problems at all.
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Old 04-05-2013, 08:08 PM   #6
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Originally Posted by Lawngnome View Post
Thanks for the help and suggestions guys. I took it back into auto zone and had them run it again and it threw the same tps code and after i told him the symptoms he told me that the flaps in the throttle body could be gummed up and sticking. I purchased some throttle body/carburetor cleaner took it home and blew it into every crevasse and cleaned the thing out. Now it runs like new, no problems at all.
What cleaner did you use? I've been having the same problem with my '99 Sahara and just spent $70 on a new CPS that didn't fix anything

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