Hello all. I have a '93 s-10 and I am having big issues right now. I just drove from California to Utah, and along the way noticed a tiny crack in the radiator. I purchased some Bar's Leak Liquid Aluminum Cooling System Stop Leak and put about half the bottle in and the leak stopped. Now today, while I was coming to a stop at a red light, the truck started idling really rough and died. I got it to start again and moved it off the road, but as soon as i took my foot off the gas, it died again. It won't run without being revved. The engine is making a pretty loud "thub-thub-thub" noise while it is running. I replaced the fuel pump relay switch about two months ago because it got fried. Any ideas or suggestions as to what is causing the problem?

 

how hot did you get it ?

 

The temp never ran over 200. I had stopped and noticed that it was leaking and hissing, so I immediately went to Napa and got that liquid aluminum. The engine ran fine the whole drive to Utah. As for it dying today, the temp got up to its normal 200. I had been driving for about 10 minutes btw...

 

You need to do some diagnosis and let us know the results. Just to name a few things...

Check the plugs - they can show you if the cylinders are burning proper or not.

Check the fuel pressure (and leak down) - your engine needs 55+psi to run properly and it shouldn't drop more than 5psi after the pump shuts off.