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87 cherokee 4.0 idle problem

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Old 08-05-2012 | 09:58 PM
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Yea that might help lol I'm on my phone so I don't even think about using punctuation that much Haha
Old 08-05-2012 | 09:59 PM
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But I'm going to try and get a new tps tomorrow and I will let you know how it goes.and thank you for all the help so far its greatly appreciated
Old 08-05-2012 | 11:31 PM
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Originally Posted by xj34
Yea that might help lol I'm on my phone so I don't even think about using punctuation that much Haha
My phone has a provision for punctuation............
Old 08-05-2012 | 11:31 PM
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Originally Posted by xj34
But I'm going to try and get a new tps tomorrow and I will let you know how it goes.and thank you for all the help so far its greatly appreciated
Keep us in the loop.
Old 08-08-2012 | 10:03 PM
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Well I worked on it today and I put the new tps in and I have the multimeter with the needle type.well I adjusted it to where I think its .8 volts and it does the weird idle and I tried bumping it up a little and then it idles too high like at 2200 rpms I can't get it adjusted right
Old 08-08-2012 | 10:04 PM
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Any tips or tricks to do it
Old 08-08-2012 | 10:17 PM
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Originally Posted by xj34
Any tips or tricks to do it
Hard with that kind of meter. Go to the lower side of what you think is .8 or so.
Old 08-08-2012 | 10:44 PM
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Alright I will try again tomorrow or I might try and get a digital one. And I have seen different ways of adjusting it some people say to use the 3 wire roundish plug (c) and (b) and some say use the square plug using (b) and (d) which one should I use
Old 08-08-2012 | 11:52 PM
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Originally Posted by xj34
Alright I will try again tomorrow or I might try and get a digital one. And I have seen different ways of adjusting it some people say to use the 3 wire roundish plug (c) and (b) and some say use the square plug using (b) and (d) which one should I use
Flat plug using these instructions:



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: With the Key OFF, and 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. Wiggle the wiring harness where it parallels the valve cover and also over near the MAP sensor on the firewall. If you see more than 1 ohm of resistance, or fluctuation in your ohms reading, 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.
FOR AUTOMATIC TRANSMISSION RELATED 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.
Revised 05-28-2012
Old 08-12-2012 | 09:54 PM
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Still can't get it everytime I get it set and get it idling right or close when I get in and put it in gear it idles down like crap again. If I set the idle high to about 2k rpms I can put it in gear and it will drop to about 1000 rpms and I can drive it any other things that could be causing it
Old 08-17-2012 | 11:01 PM
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Any ideas what it could be
Old 08-17-2012 | 11:32 PM
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marking
Old 08-18-2012 | 12:19 AM
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Could be a bad TPS or bad 02 sensor.
Old 08-18-2012 | 07:44 AM
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Well its got a new tps and when its idling decent I can unplug the iac and it don't change at all. Should it change when unplugged
Old 08-18-2012 | 08:39 AM
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Originally Posted by xj34
Well its got a new tps and when its idling decent I can unplug the iac and it don't change at all. Should it change when unplugged
Did you adjust the new TPS?


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