High RPM (I think) - JeepForum.com

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post #1 of 16 Old 01-14-2013, 05:07 AM Thread Starter
bmedeiros678
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High RPM (I think)

Hi All. I am not sure if this is "normal" or not. '93 Automatic sometimes jeep feels like it wants to take off. I switched to k&n filter and feels a lot better but this is what I notice. If I am driving and put transmission in neutral the rpm go up to 1500 and will not drop until vehicle stops completely. When in drive I hear a down shifting sound and feels like the jeep would start to accelerate if I did not have my foot on the brake. I have cleaned the throttle and sensor that was dirty but don't know if I am waisting my time or not.


'93 YJ Renegade
'91 XJ Briarwood
'85 CJ7 Laredo
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post #2 of 16 Old 01-14-2013, 05:21 AM
Que89YJ
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Sounds normal to me. Check your codes
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post #3 of 16 Old 01-14-2013, 06:51 AM Thread Starter
bmedeiros678
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Quote:
Originally Posted by Que89YJ
Sounds normal to me. Check your codes
Ok will do. Will also compare to my wife's '92.

'93 YJ Renegade
'91 XJ Briarwood
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post #4 of 16 Old 01-14-2013, 08:11 AM
pasinbuy
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I believe it is the TPS that may be bad. Throttle Position Sensor. Located on the intake, cost about $50.00.

You could try pulling and cleaning it first.

Does not sound normal to me if the idle stays high.
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post #5 of 16 Old 01-14-2013, 08:56 AM
Siva283
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Quote:
Originally Posted by pasinbuy View Post
I believe it is the TPS that may be bad. Throttle Position Sensor. Located on the intake, cost about $50.00.

You could try pulling and cleaning it first.

Does not sound normal to me if the idle stays high.
In an Automatic it will not go to an idle until you are stopped. As long as you are moving it will keep the RPM up some. Every fuel injected vehicle I have ever had does that

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
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I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
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Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
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Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #6 of 16 Old 01-14-2013, 10:14 AM Thread Starter
bmedeiros678
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So I just learned how to see the codes by turning jeep off and on. I take it that I can have an error even without the check engine light being on.

'93 YJ Renegade
'91 XJ Briarwood
'85 CJ7 Laredo
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post #7 of 16 Old 01-14-2013, 10:23 AM
Siva283
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Quote:
Originally Posted by bmedeiros678 View Post
So I just learned how to see the codes by turning jeep off and on. I take it that I can have an error even without the check engine light being on.
Yes things can still fail within parameters.

Sent from my Galaxy S3 using JeepForum

1995 YJ. 2 inch BDS Spring lift. 1 inch shackle lift. 1.25 inch JKS Body Lift 33x12.5x15's. Engo 10,000 pound winch.

Quote:
Originally Posted by Magnum View Post
I gave the Jeep the required offering of $$, sweat, and blood, and everything works fine now. -- Jim
Quote:
Originally Posted by ldso View Post
. It started with a $200 axle, and a few thousand dollars later I was done :)
Quote:
Originally Posted by Luuca View Post
diagnose the real issue before you start going all Obama on it - spending mad cash you'll need for other important things.

Ask me how I know...
Quote:
Originally Posted by Overhead View Post
this is also my second set of RC springs this year. I'd rather spend the money again and get something that will last.
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post #8 of 16 Old 01-14-2013, 03:39 PM Thread Starter
bmedeiros678
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Location: N. Attleboro
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Quote:
Originally Posted by Siva283

Yes things can still fail within parameters.

Sent from my Galaxy S3 using JeepForum
Wonderful Siva. Codes were 12 21 24 21 55. 12 makes sense. Don't know why 21 happened twice. And 24 is tps. I can purchase that for 20.00 at crown so i will pick one up tomorrow. Then retest I take it.
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post #9 of 16 Old 01-14-2013, 03:49 PM
Que89YJ
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Reset the memory by disconnecting the battery. Drive it until it warms up and recheck the codes
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post #10 of 16 Old 01-14-2013, 04:21 PM Thread Starter
bmedeiros678
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Quote:
Originally Posted by Que89YJ
Reset the memory by disconnecting the battery. Drive it until it warms up and recheck the codes
10-4 thanks! Any idea why o2 sensor is on twice?

'93 YJ Renegade
'91 XJ Briarwood
'85 CJ7 Laredo
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post #11 of 16 Old 01-14-2013, 05:06 PM
Que89YJ
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Miscount maybe. Seen it double up codes before but no big deal. See what it says after you redo it.
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post #12 of 16 Old 01-14-2013, 05:08 PM Thread Starter
bmedeiros678
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Thanks again. I will post updates ASAP.

'93 YJ Renegade
'91 XJ Briarwood
'85 CJ7 Laredo
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post #13 of 16 Old 01-16-2013, 05:18 AM Thread Starter
bmedeiros678
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New tps fixed it. Reset the computer and the rpm went from 1500 down to 1000 while moving. 800 in park and at a stop tach went all the way down to the little dash just above the 0. Doesn't feel like it is taking off at all anymore. Thanks for your help!

'93 YJ Renegade
'91 XJ Briarwood
'85 CJ7 Laredo
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post #14 of 16 Old 01-17-2013, 11:55 AM Thread Starter
bmedeiros678
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Since resetting the computer the o2 sensor shows normal. Dies than mean I don't need to replace?

'93 YJ Renegade
'91 XJ Briarwood
'85 CJ7 Laredo
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post #15 of 16 Old 01-17-2013, 12:04 PM
Que89YJ
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The TPS with throw off the cal and dump too much fuel and set the O2 code. No need to replace it.
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