blacklab

My 94 XJ won't idle when it's cold, I have to give it throttle to start it and keep it running.
I've cleaned the throttle body, and the IAC, and changed the TPS.
I'm cleaning all the grounds and connectors, so far it's no better.
Any suggestions will be appreciated.

1976Mustang

Check your intake temp sensor? I forgot what Jeep calls it.

1976Mustang

Get your hands on a good multimeter, and check it using this chart.

PROCEDURE
1. Disconnect the wire harness connector from the sensor.

2. Test the resistance of the sensor with a input impedance (digital) volt-ohmmeter.

^ The resistance should be less than 1000 ohms with the engine warm. Replace the sensor if it is not within the range of resistance specified in the chart.

3. Test the resistance of the wire harness.

^ This is done between the engine controller wire harness connector (terminal 2) and the sensor connector terminal. Also check continuity between terminal 4 to the sensor connector terminal. Repair the wire harness as necessary if the resistance is greater than 1 ohm.


TEMPERATURE RESISTANCE (OHMS)

°C °F MIN MAX
.................................................. ..............................
-40 -4O 291,490 381,710

-20 -4 85,850 108,390

-10 14 49,250 61,430

0 32 29,330 35,990

10 50 17,990 21,810

20 68 11,370 13,610

25 77 9,120 10,880

30 86 7,370 8,750

40 104 4,900 5,750

50 122 3,330 3,880

60 14O 2,310 2,670

70 158 1,630 1,870

80 176 1,170 1,340

90 194 860 970

100 212 640 720

110 230 480 540

120 248 370 410


If it's good, I'd look at the Coolant temp sensor. There may be two of them, but you'll want to test the one on the t/stat housing.

salad

^^ This

blacklab

Thanks for the help. I think I've got it beat. I cleaned all the grounds and all the connections. I found that the clip that holds the wiring on the MAP sensor was broken.
The plug in wiring was loose. I zip tied it in place. Runs much better , and started fine this morning at -2.