when i set my tps sensor to the .8, my jeep idles at 2300 rpm and will not drop back down??? i have to set the tps to .3v to get the jeep to idle around 600 even then it will idel rough and die out. my jeep also runs like complete crap when its warm and dies all the time while driving ig i let of the gas any ides???


im really getting sick of this jeep ive NEVER gone out to the 4x4 park and not had it break down

 

cps sensor checked out fine, new coolant temp sensor(in the side of the block and in the rad), new injectors, new fuel pump, new fuel filter, new cap rotor wires and plugs, freshly cleaned grounds, good battery, new water pump, t stat, new head gasket(i did a comp test all cylinders came out good and even). im annoyed and about 2sec from making this piece of crap a parts jeep and just buying another on

 

Just curious, because I don't really know, how do you "set" your tps?

 

Check your wiring from the TPS to the ECU. I had a wire get broken in the loom from engine vibrations and i had similar problems.

 

did you uh, reset your computer?

 

Have you checked your MAP sensor? Do you see the voltage change on the TPS when you open the the throttle?

 

The older models have an adjustable TPS. You use the two retaining screws that hold it in place to adjust it.

http://autorepair.about.com/library/faqs/bl232i.htm

Here are instructions.

The newer models are not adjustable. They are plug-n-play.

 

Here's the easy way to test/adjust your TPS and allows you to test the side of the TPS that you're concerned about: Engine or Trans.

Do the sensor ground test as described in the beginning. CRITICAL!


RENIX TPS ADJUSTMENT
Before attempting to adjust your TPS be sure the throttle body has been recently cleaned.
It's especially important that the edges of the throttle butterfly are free of any carbon build-up.
IMPORTANT NOTE: Using the positive (red) lead of your ohmmeter, probe the B terminal of the flat 3 wire connector
of the TPS . The letters are embossed on the connector itself.
Touch the black lead of your meter to the negative battery post.
If you see more than 1 ohm of resistance some modifications to the sensor ground harness will be
necessary. The harness repair must be performed before proceeding.
I can provide an instruction sheet for that if needed.
MANUAL TRANSMISSION:
RENIX manual transmission equipped XJs have a three-wire TPS mounted on the throttle body.
This manual transmission vehicle TPS provides data input to the ECU. The manual transmission
TPS has three wires in the connector and they're clearly embossed with the letters A,B, and C.
Wire "A" is positive.
Wire "B" is ground.
Key ON, measure voltage from "A" positive to "B" ground by back-probing the connectors..
Note the voltage reading--this is your REFERENCE voltage.
Key ON, back-probe the connector at wires "B" and "C". Measure the voltage. This is your
OUTPUT voltage.
Your OUTPUT voltage needs to be seventeen percent of your REFERENCE voltage. For
example: 4.82 volts X .17=.82 volts. Adjust the TPS until you have achieved this percentage. If
you can't achieve the correct output voltage replace the TPS and start over.
AUTOMATIC TRANSMISSION:
RENIX automatic transmission equipped XJs have a TPS with two connectors. There is a flat three-
wire connector, same as the manual transmission vehicles have, and it is tested the same as the
manual transmission equipped vehicles--FOR ENGINE MANAGEMENT RELATED ISSUES.
However, the automatic TPS also has a square four-wire connector clearly embossed with the letters
A,B,C, and D. It only uses three wires and provides information to the Transmission Control Module.
Key ON, measure voltage between "A" positive and "D" ground. Note the voltage. This is your
REFERENCE voltage.
Back-probe the connector at wires "B" and "D". Measure the voltage. This is your OUTPUT
voltage. Your OUTPUT voltage needs to be eighty-three percent of your REFERENCE voltage.
For example 4.8 volts X .83=3.98 volts. Adjust the TPS until you have achieved this percentage.
If you can't, replace the TPS and start over.
So, if you have an automatic equipped XJ your TPS has two sides--one side feeds the ECU, and
the other side feeds the TCU. If you have TRANSMISSION issues check the four-wire
connector side of the TPS. If you have ENGINE issues check the three-wire connector side of
the TPS.
For those with a MANUAL TRANSMISSION--the TPS for the manual transmission XJs is
stupid expensive. You can substitute the automatic transmission TPS which is reasonably priced.


 

I had some thing like that happen to me, it turned out that my fuel pressure was inconsistent and always low because some one at the bosch plant tightened a hose clamp on the tapered portion of a steel tube not on the flat. when I took it apart Everything looked ok. I only found the loose clamp because my 4 year old snuck outside to 'help' dad replace the fuel pump and I picked up the pump assembly by the short hose to keep it out of his reach.

fuel pressure is a cheep n' easy check and it would have saved me over $300 in parts If I had done it sooner.

btw I am not bashing bosch someone on an assembly line just got in a hurry

 

buy a toyota. much better quality

 

Whens the last time you cleaned/tested the IAC?

 

i got it, turns out the egr valve was opening when it was not suppose to. so i unhooked it and she is like new. thanks for all the ideas