Greetings. I have a '92 Dakota V8 4x4. 200,000 miles. Had to replace the fuel pump about 6 months ago, but usually a good strong truck. Last week I was 5 miles from home and it died on the highway. 20 minutes later it started right up and ran great. Now it keeps doing that. Sometimes dies before I get where I'm going. Starts right up when cold but will not start when hot. Turns over strong, but won't fire. Any ideas what to check?

 

Check the MAP sensor. That sounds like what happened when my MAP sensor went bad.

 

I know what and where a MAP sensor is, but how do you "check" a MAP sensor?

 

To test:
(1) Inspect rubber L-shaped fitting from the MAP sensor to the throttle body. Repair as necessary.
(2) Test MAP sensor output voltage at the MAP sensor connector between terminals A and B (picture provided). With the ignition in the ON position (and engine OFF), output voltage should be 4 to 5 volts. The voltage should drop to 1.5 to 2.1 volts with a hot, neutral idle speed condition.
(3) Test PCM (powertrain control module) cavity A-27 for the same voltage described above to verify the wire harness condition. Repair as necessary.
(4) Test MAP sensor supply voltage at sensor connector between terminals A and C with the ignition ON. The voltage should be appx. 5 volts (+/- 0.5 volts) Five volts (+/- 0.5 volts) should also be at terminal A-17 of the PCM wire harness connector. Repair or replace the wire harness as necessary.
(5) Test MAP sensor ground circuit at sensor terminal (A) and PCM connector A-4. Repair the wire harness if necessary.

There are 3 connectors for the PCM. IIRC, connector A is the one in the front. The pins should all be marked on the inside of the connector.

[IMG]local://upfiles/948/6D5A2CB725F942A48AD6EF138B57FB39.gif[/IMG]

 

Also heat sensitive coil, pickup assembly in distributor or crankshaft position sensor.
http://dodgeram.info/tsb/1992/18-04-92.htm