hello everybody!
about a month ago my 90' K5 stalled while running. i tried to start it and it started with ease. an hour later it stalled again and started again with no problem at all. the problem disappeared for about a week and came back strong - i was driving, it stalled, i started it, it ran for a few seconds and stalled again, repeatedly. after a few times it refused to start. i had to give some time to cool down before i could start it again.
every other day the engine stalls, and when it's not, it runs perfectly.
i'm having trouble finding the cause to this mess - any help will be appreciated.

yarin.

 

Any codes?

You could remove your coil and have it tested. Same for the ESC (electronic spark control) module.

 

last time i checked, no codes.
is there a particular way to test the coil and the ESC?

 

Take them to your closest advance auto or autozone. They should have the proper analyzers to stress and test them.

 

thanks, i'll give it a try.
but let me get it straight - you're saying that a test with a multimeter is insufficient or unreliable?

 

Most problems with these components surface when they are stressed (either by load, temperature, or a combination of the two). These two items would have to be in pretty bad shape for them to test bad using a multimeter.

 

it's been almost a month since i posted a message about my stalling problem. since then the truck ran beautifuly and never stalled, so i didn't replaced the ignition module and the coil like i was told to. last night the truck stalled at very low speed and started right back on. then i parked for a few minutes with my engine still running. then the rpm dropped significantly and came back to normal after a few seconds. and a minute later the engine stalled again.

i know i didn't replaced the parts i was asked to replace but i thought maybe this rpm thing might give you a new lead.

yarin.

 

It may be a result of a sticking IAC valve in the throttle body. I would remove and clean the throttle body, installing a new TB base gasket when you put it back on. Be careful with the fuel line connection at the back!

 

is there a way to check the IAC valve?

 

If you have the appropriate scan tool that is capable of bi-directional controls, yes. But start with removing the throttle body and cleaning it.