cruiser54

I know the suffix has to do with which gaskets are included in the box. So, what about one with no suffix or an A or B or something?

Thanks. You don't stock them?

I haven't seen a current one either. Interesting to see where they're made now and by whom.

I was asking eaglescout to answer the rest of my questions. I've been down this thermostat rabbit hole before. I learned the hard way that factory stats are the only way to go. I'm trying to find out if the current Mopar ones are made by the same company in the same country.

Maybe this will help: CRUISER'S MOSTLY RENIX TIPS RENIX TPS ADJUSTMENT OCTOBER 30, 2015 SALAD 198 COMMENTS EDIT Before attempting to adjust your TPS, there are a few things that need to be done. 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. With the KEY OFF, and using the positive (red) lead of your ohmmeter, set on the lowest scale, 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. It is covered in detail in Tip 6. TPS ADJUSTMENT FOR ENGINE ISSUES Both Renix manual and automatic transmission equipped XJs and MJs have a flat three-wire connector to the TPS which provides data input to the ECU. The three wires in the connector are clearly embossed with the letters A, B, and C. Wire “A” is positive. Wire “B” is ground. DO NOT UNPLUG THE CONNECTORS! 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. Loosen both T-20 Torx screws attaching the TPS to the throttle body and rotate the TPS until you have achieved your desired output voltage. Tighten the screws carefully while watching to see that your output voltage remains where it is supposed to be. If you can’t achieve the correct output voltage, replace the TPS and start over. Sometimes, after adjusting your TPS the way outlined above, you may experience a high idle upon starting. If that happens, shut the engine off and reconnect your probes to B and C. Start the engine and while watching your meter, turn the TPS clockwise until the idle drops to normal and then rotate it back counterclockwise to your desired output voltage. TPS ADJUSTMENT FOR AUTOMATIC TRANSMISSION ISSUES Renix automatic transmission-equipped XJs and MJs 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 outlined above—FOR ALL 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. THIS SQUARE FOUR WIRE CONNECTOR IS USED FOR TRANSMISSION/SHIFTING RELATED ISSUES ONLY. First off, DO NOT UNPLUG THE CONNECTORS! KEY ON, measure voltage between “A” positive and “D” ground by back-probing the connector. 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 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. The square 4 wire connector is just not used.

Come Monday, can you find the answers to my other questions?

@eaglescout526 What is the current part number for a factory thermostat? Where is it made? By what company? Does it have the "jiggle valve"? What's the price?

Add the ground for sure.

I almost did. Then I read in his signature that it was manual trans.

take a deep breath. get in touch with your inner engine and slowly go over the engine with a stethoscope.

If it stays the same and doesn't get worse, and isn't related to engine load, I wouldn't panic about it. Does it change with engine temp? What brand oil filter are you using?

Pinpoint it with a stethoscope yourself.

In the swap, was anything done with the TCU by chance? The plug on the TCU harness must be the same color as the plug on the TCU. Also, the ground for the TCU must be real good. Here's something else to check. CRUISER'S MOSTLY RENIX TIPS TRANSMISSION CONNECTOR REFRESHING OCTOBER 30, 2015 SALAD 22 COMMENTS EDIT Over near the transmission dipstick tube are 2 rather large connectors. One is black and goes to the NSS and the gray connector goes to the transmission itself . These 2 connectors carry all the info between TPS, TCU, NSS, speed sensor, and transmission solenoids. Unplug each one, visually inspect for corrosion or bent pins, spray them out with electrical contact cleaner and plug them back in. Additionally, if your Jeep is an ’87 to ’90 Renix, it’s always a good idea to reach up under the glovebox area and unplug the connector to the TCU and spray it out along with the receptacle of the TCU. While you’re there, find the fuse right in that area for the TCU. Remove it and spray out it’s receptacle and clean any corrosion from the fuse. Revised 1-31-2016

coolant temp SENSOR is low on the engine block driver's side. Gauge SENDER is on the head at the rear driver's side.

I can see both. I used green.

Oh, okay. Why do you feel you need a new IAT for your Renix?

I never dimmed any of mine. I like to see them.

https://www.quadratec.com/products/55121_00.htm

Begin by inspecting and adjusting the rear brakes.

For the gauge?

So that means it's not opening and letting exhaust gasses into the intake, which is good. What is your concern?

The metal vacuum cans under the hood.

Nothing a BB in the vacuum line wouldn't fix........

You know what the giraffe said when he walked into the bar? "The high balls are on me".

Put the mounting flange up to your mouth and see if you can blow air past the pintle.