TPS (Throttle Position Sensor) Went In the ZJ Yesterday - JeepForum.com

 
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post #1 of 11 Old 06-26-2013, 09:22 AM Thread Starter
1ATony
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TPS (Throttle Position Sensor) Went In the ZJ Yesterday

8:00 AM was on my way to work yesterday 79 degrees out had the window rolled down and was loving life when the TPS in my Jeep Grand Cherokee decided to call it quits.

So the next 10 miles to work were like driving a buckin Bronco...lol I grabbed a new TPS off of the shelf over here and the ZJ runs mint now.

Ever since I bought my Jeep (little over a year ago) it would stumble once in a while when it was hot out, but it never threw a code until yesterday.

If anyone has theirs go I just straightened out out ZJ TPS section over here. Here's a link to them on the site for you guys. It always something...

Tony

Jeep Grand Cherokee TPS

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post #2 of 11 Old 06-26-2013, 02:52 PM
Montaska
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I got mine from you guys, as well. Good to go!

1997 ZJ: Sold | 2002 WJ: Sold | 2007 JK: Sold | 2016 KL: Current
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post #3 of 11 Old 06-27-2013, 06:22 AM Thread Starter
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Quote:
Originally Posted by Montaska View Post
I got mine from you guys, as well. Good to go!
Happens to the best of us...darn Jeep. It made a huge difference in the throttle response. Runs pretty awesome now.
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post #4 of 11 Old 06-27-2013, 10:15 AM
huntsducks70
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does the TPS increase the idle when additional load is placed on the engine? like when the A/C is turned on? if not, do you guys know what is supposed to increase the idle RPM under this condition?

thanks
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post #5 of 11 Old 06-27-2013, 05:13 PM
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how do you know when the tps is going bad? like ; bogging down when it is supposed to accelerate? sort of as if when pressing, it reacts as if letting off....

is there a volt test? like plug into it and read specific resistance?

Jeep Grand Cherokee 1995 v8 5.2 205000
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post #6 of 11 Old 06-27-2013, 10:33 PM
jnicewan
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Quote:
Originally Posted by huntsducks70 View Post
does the TPS increase the idle when additional load is placed on the engine? like when the A/C is turned on? if not, do you guys know what is supposed to increase the idle RPM under this condition?

thanks
Idle speed is controlled by the IAC (idle air control) valve but many other things can influence the desired idle speed. The IAC is right beside the TP sensor on the throttle body. You might try removing and cleaning the tip, along with the passage it goes into and the throttle plate. IAC might also be faulty/inop

Quote:
Originally Posted by BeDifferent View Post
how do you know when the tps is going bad? like ; bogging down when it is supposed to accelerate? sort of as if when pressing, it reacts as if letting off....

is there a volt test? like plug into it and read specific resistance?
TP faults can do a number of weird things like certain trans shifting problems (t/c & o/d), along with high/low or erratic idle, hesitation on accel or "dead spots" in the accel. Since the TP is a linear measurement of the throttle position, a lot of times the fault or concern is directly related to a certain throttle position or movement. Easiest test for TP is measuring voltage coming out of the TP at the center terminal of connector. At idle reading should be around .5-1.1V or at least above .2V, slowly start opening the throttle plate and the voltage should gradually start climbing up, typically over 3.8V but less than 4.8V. Watch for drop outs or erratic voltage while slowly moving the throttle, TP should never be below .2V or above 4.8V.
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post #7 of 11 Old 06-28-2013, 06:35 AM Thread Starter
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Quote:
Originally Posted by BeDifferent View Post
how do you know when the tps is going bad? like ; bogging down when it is supposed to accelerate? sort of as if when pressing, it reacts as if letting off....

is there a volt test? like plug into it and read specific resistance?
Mine just went on the way to work. I went to take off and my ZJ just fell on it's face. When I hit the throttle it would catch, and then stumble and then catch again.

My check engine light came on too, so I pulled the code at work and it pointed to a voltage condition with the TPS.
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post #8 of 11 Old 06-28-2013, 12:43 PM
Oldfrog
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Ugh....I carry a spare TPS now because I had to drive 50 miles on the interstate to get home late one night with a bad one. Fuel mileage was down to about 7 MPG on that little jaunt. I was hauling tail too....maybe 40 mph....downhill.

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #9 of 11 Old 06-28-2013, 01:00 PM Thread Starter
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It's crazy how such a small thing can create such a huge problem...lol
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post #10 of 11 Old 06-28-2013, 01:10 PM
Oldfrog
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Yup, it's not the only spare part I carry, either. Coil, map sensor, crank sensor, distr. cap, rotor, cam sensor, PCM, serpentine belt, front hub, etc. 'On the road a lot and I dont let anyone else put even a screwdriver to my vehicle or boat engines. Of course, you also know the tools I have to carry. That's probably why my mileage is around 14.5 in town. When I leave the house I want to "eventually" get where I'm going....and I usually do.....at some point in time.

2007 5.7 Hemi, Ltd. QD II -
1997 ZJ, 4,0 select trac, Up country, track lok.
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post #11 of 11 Old 06-28-2013, 05:23 PM
BeDifferent
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Quote:
Originally Posted by jnicewan View Post

TP faults can do a number of weird things like certain trans shifting problems (t/c & o/d), along with high/low or erratic idle, hesitation on accel or "dead spots" in the accel. Since the TP is a linear measurement of the throttle position, a lot of times the fault or concern is directly related to a certain throttle position or movement. Easiest test for TP is measuring voltage coming out of the TP at the center terminal of connector. At idle reading should be around .5-1.1V or at least above .2V, slowly start opening the throttle plate and the voltage should gradually start climbing up, typically over 3.8V but less than 4.8V. Watch for drop outs or erratic voltage while slowly moving the throttle, TP should never be below .2V or above 4.8V.
Thank You so much for the clear answer.. ..

Jeep Grand Cherokee 1995 v8 5.2 205000
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