About a month ago, I was coming into Madison, WI. While waiting at a stop light my truck died. After sitting for about a half hour, I got it started and got off the road. I tried starting it after getting it off the road and had virtually no success. I unhooked the airflow sensor and was able to limp it home. After getting home, I cleaned the sensor and re-installed it. It ran, for about a half hour. Each time I started it I would get less time it would stay running before dying. Now when I start it, when it actually starts, it runs for about 45 seconds to a minute then dies. I have replaced the ignition module, the coil, spark plugs, fuel and air filters, catalytic converter all to no avail. Anyone have any ideas?

 

*Moving to 2nd Gen Tech* - The 1st gen tech section is for '94 and older s-series technical questions.

This type of problem can be caused by a heat related fault in the ICM (ignition control module) and/or ignition coil.

 

Tried replacing both of those. Didn't help

 

It wouldn't be the first time someone has purchased bad ones straight from the store? Try to find a store that can test them, repeatedly.

Have you tested fuel pressure?

 

We had the icm tested at autozone, both the old one and the one we bought. Both were good, luckily they refunded the one we bought. I am about to check the fuel pressure

 

They did the test on the icm eight times, to make sure it was working after getting up to temp

 

I would definately check the fuel pressure. could be as simple as a plugged filter.

 

Changed the fuel filter. Changed the fuel pump after having no pressure when attempting the fuel pressure test. New fuel pump is in, wouldn't start. Took off the fuel line at the filter, no gas was coming out. The fuel pump seems to be turning on and the relay is good. Help

 

Do you hear the pump ? line is clogged? disconnect the line by the filter and then blow it out from the sending unit tip toward the filter make sure the filter is not connected when do so . make sure you disconnect the sending unit and blow out the line that is connected to the filter

 

it could be a clogged fuel line try un hooking the quick disconnect lines to the fuel pump and turn the key to the on position if fuel comes out then ur pump is working. it may be the line is clogged check for twisted lines and kinks.