I'm working on my son's 89 Chevy 1500 2wd 5.7 TBI. When this problem started it would start and idle just fine while warming it up (10-15 minutes) but he would drive it about 2 blocks and it would die and not restart. If I pour gas in the TB it would start but then die quickly. I could not feel any fuel coming out of the injectors so I fugured it was the fuel pump we replaced the fuel pump but the truck still would not start. We have fuel flow and good presure. I took the ignition module out to have it tested and it tested good. When I took the module out it did not have Dialectric grease on it so I put some on when I re-installed it. After re-installing the same module the the truck started and ran fine for 1 day. The next day it would not start at all. I checked the injectors with a noid light and I have no signal but I do have ground when the key is on Injector fuse is good as are all fuses in the fuse panel. I am stumped on this one and getting frustrated so any help will e greatly appreciated.

 

I took the module out again and had it tested and it tested fine again but I bit the bullet and put a new ignition module in it anyway and it fired right up and is running fine today. I will let you guys know if it dies tomorrow.

 

It sounds like the module. And you gotta put dielectric grease on it. Helps keep it cool. I ran a module for 2 blocks without grease and missing 1 bolt. (dropped it as i was broke down on side of road) 2 blocks from home. It ended up getting a blister on it that fast. I bet your problem is solved.

 

I had this truck for 10 or 12 years before I gave it to my son who has driven it for a couple years now. the module has never been out in all of that time so it lasted a long time without the grease. I am also somewhat ashamed to admit that the oil has never been changed in all that time either. I found this a couple days ago when I attempted to fix an oil leak that it has always had since I owned it. It was leaking from the oil filter the filter was a Hastings oil filter and I ONLY use Fram oil filters. Thank you for the reply I hope it is fixed.

 

It probably is . When ignition modules start failing they often work when cold, but fail as they heat up. If they had tested it a few times it probably would have started to fail. Have fun!

 

I think this one was doing just the opposite. I think it worked when it was hot/warm but not when it was cold. When they tested it the first time they did it 3 times Which made it a little warm. I think that's why it worked when I re-installed it but once it got cold sitting over night it stopped working.

 

Well anyways, as long as this one works all the time you have achieved your goal!