Ωhm

Pin 30 receives Battery voltage from a Fusible Link. Examine all fusible links for bubbles, frayed insulation, located off the starter relay. If good, disconnect C103 (flat 6 pin connector) located on the right side of engine, near rear of engine compartment. Measure for B+ on Pin B (Red) using the side that goes back towards the battery.

Pin 86 show normal at this time. Pin 30 Hot at all times.

Pin 30 on the relay block (relay removed) should be Hot (battery voltage) at all times, even with the keys in your pocket.

As mentioned above: YR?? ENG?? TRANS??

Swap fuel pump relay with known good relay. Use the relays right next to it. If there is no change, take two (2) voltage measurements: Remove fuel pump relay and measure at relay block. Pin 30: Hot at all times (battery voltage). Pin 86: Hot with Key On (battery voltage).

Make sure the ballast resistor is not an open circuit. Ohmmeter across the ballast. (1.1 to 1.4 ohms).

Yea, diesel emissions is a different world.

Don't think EGR deals with NOx. NOx shows up when running lean.

Welcome to the CC Forum.

If its a new battery, may be faulty.

Can you read OBD codes? Do you have "Check Engine" lamp? Found this link, maybe you did too. http://www.myazcar.com/obd-check-engine-light

Swap the headlamps (L to R, R to L) and see if the problem follows the headlamps. Could determine if its a passenger side wiring issue.

Since I don't know, is it opened or closed cooling system?

MAP, CTS, MAT & TPS all use ECU outputted 5 volts.

CTS (ECT) uses the 5 volt reference.

R U A V6, if so, I don't see no DTC's posted for a 3rd cat.

Could a harness "wiggle test" help here at idle?

Two thoughts (guesses) here: loose throttle plate faulty motor mount

My "keyless entry" search only finds keyless entry. Seems to be working fine for me. Tried searching both 'signed in' and 'signed out', same results.

Are you going to sell all your chrome ashtrays?

Info taken from online auto parts, can't say how accurate it is. 1987 Comanche 2.1L 126Cu. In. l4 DIESEL SOHC Turbocharged Laredo 2.5L 150Cu. In. l4 GAS OHV Laredo 4.0L 242Cu. In. l6 GAS OHV Laredo 1988 Comanche 2.5L 150Cu. In. l4 GAS OHV Laredo 4.0L 242Cu. In. l6 GAS OHV Laredo

Looks like a great trip, great pictures. Luckily you didn't need the services of Jamie Davis (Highway Thru Hell) reality TV.

Click here: Go to page 71

Does the fuel injector dump fuel during CRANK? CPS related question.

Did you move your distributor lately? If so, check indexing. Also, could be cross fire in the distributor cap during advanced timing situation (upper RPM's).