cruiser54

Put a timing light on it and see. I think 12 is normal at idle.

I've used the Napa NR2802 in numerous XJs and MJs with no issues.

I'm very suspicious of the MAP reading. What did Tip 5 reveal? Might check the ground at the MAP itself anyway, Also, if the hose from MAP to throttle body doesn't "cascade" and has low spots, that can cause issues.

Tip 5 been done?

What year is it?

the thing on the passenger inner fender that has the wire running between it and the distributor cap.

get a used one

CRUISER'S MOSTLY RENIX TIPS RENIX ICU/COIL CONTACT REFRESHING OCTOBER 30, 2015 SALAD 29 COMMENTS The contacts between the coil and the ICU on your Renix Jeep can become corroded and loose causing a complete or intermittent no-start condition. I recommend the following procedure as a maintenance precaution to insure this is eliminated as a possible cause now and in the future. The coil is attached to the ICU by two T20 Torx bolts. Remove these two bolts and lift the coil up off the ICU. You will see 2 pins and 2 sets of contacts. Clean both the pins and springy contact pieces with a good electronics cleaner and some fine sandpaper. Squeeze the springy contacts closer together with some needle nose pliers. Apply some OxGard to the contacts. Bolt the coil back on to the ICU. While you’re right there, unplug the connectors from the ICU and inspect the pins in the harness connector. Make sure the pins are not retracted into the connector. Spray out the connector and the receptacle of the ICU with the same good electronics cleaner you used earlier. I feel this procedure should be performed at least once in the lifetime of a Renix Jeep.

Little more zip.

I've done it on a 2.5.

You know, there was an issue with the flexible clutch line between the master and slave cylinders. The rubber line reacted badly to the fluid they used and shed off some gritty stuff. That stuff trashed the cylinders. It was always recommended that the line be replaced when a cylinder failed.

I think it was 5* in high altitude configuration. My mod takes it a few degrees more than that.

Definitely worth doing.

shouldn't be an issue at lower elevation. The system has a knock sensor anyway.

Complete Tips 1 through 5 first.

Good plan!! That wire is likely for the underhood light.

Excellent!!

88 and later are more desirable.

That isn't factory.... The TCU may be bad. It happens. You can grab a TCU from any 88 through 90 Cherokee or Comanche.

MAP sensor shows quite low vacuum.

Pretty sure it's 12V. All the ground wires on that dipstick stud are black. You want the ground terminal AT the TCU? D3, D7, C5

So, you have an oxygen sensor for the factory setup and a separate one for your wideband?

You could also check for voltage at the fuse while you're at it.

What's going wrong with your wideband? Just the O2 sensor or the unit itself?