i have a problem with my 1993 gmc sonoma sl 2.5l PLEASE HELP!!!!!!!!!

[1993gmcsonoma2.5l]

ok i have a 1993 gmc sonoma sl 2.5l 4 cylinder and i have a problem with it dying when it gets hot. we thought it may have been the fuel pump but it wasnt it so i have replaced the throttle position sensor (tps) and the idle air control sensor (IAC) and the fuel injector on top of the throttle body and a fuel filter. it runs fine when you first start it when everything is cold but as soon it gets over a 100 degrees it dies and then when you try to start it again it wont start until you manuely put gas into the throttle body and also we checked the fuel pressure regulator and it looked excellent so can somebody please help me im going crazy!!!!!!!

 

[Molson02536]

ok i have a 1993 gmc sonoma sl 2.5l 4 cylinder and i have a problem with it dying when it gets hot. we thought it may have been the fuel pump but it wasnt it so i have replaced the throttle position sensor (tps) and the idle air control sensor (IAC) and the fuel injector on top of the throttle body and a fuel filter. it runs fine when you first start it when everything is cold but as soon it gets over a 100 degrees it dies and then when you try to start it again it wont start until you manuely put gas into the throttle body and also we checked the fuel pressure regulator and it looked excellent so can somebody please help me im going crazy!!!!!!!

Have your ICM (Ignition Control Module) tested and replace if it's gone bad. Common for the engine to stall out and die when the ICM heats up and when it cools down again, it works.

Start with this first and we can go from there, BTW most places like Parts Source or Napa can test the ICM for you.

Molson02536

 

[1993gmcsonoma2.5l]

Have your ICM (Ignition Control Module) tested and replace if it's gone bad. Common for the engine to stall out and die when the ICM heats up and when it cools down again, it works.

Start with this first and we can go from there, BTW most places like Parts Source or Napa can test the ICM for you.

Molson02536

ok i tonight me and my dad was messng with the truck and we was wonder if i was firing so i got in the truck and dad pulled the sparkplug wire and it was firing and so it act like it aint getting fuel and we know for sure it is getting fuel to the throttlebody but the injector aint spraying it to first start it does the icm control the fuel to or just ignition we are just really confused???

 

[Molson02536]

ok i tonight me and my dad was messng with the truck and we was wonder if i was firing so i got in the truck and dad pulled the sparkplug wire and it was firing and so it act like it aint getting fuel and we know for sure it is getting fuel to the throttlebody but the injector aint spraying it to first start it does the icm control the fuel to or just ignition we are just really confused???

The ICM is an amplifier, it takes the +5 to 0 volt low current pulses from the PCM and amplifies the voltage and current, it then feeds the amplified signals to the coil. If it goes bad you have week or no pulses to the coil resulting in poor or no spark to the plugs.

In the GM they tend to fail more often when they get hot, then start working again when it cools down. But that's no guarantee the ICM can be tested at local parts stores, but again passing a bench test does not always mean they are working under actual heated conditions. (ICM caused PCM input to go bad) but there is no DTC for the output to the coil not working, just a no start, or poor performance.

If it is a bad ICM, stay away from the cheap ICM's, this is one part that I'd bite the bullet on and pony up the $$$$ at the GM dealer for genuine. If you go to a discount GM dealer it will only be about $30 more then the cheap one's at auto parts stores.

In short, Ignition Control Module is the brains behind the spark plugs. The ICM tells the spark plugs when to fire and lets the engine know when gas needs to be released for proper engine ignition. Sometimes if your ICM is out or going bad, you may be able to start your motor up nicely once and then when you turn it off it may not start back up.

Hope this helps clear a few things about ICM's

Molson02536

 

[1993gmcsonoma2.5l]

The ICM is an amplifier, it takes the +5 to 0 volt low current pulses from the PCM and amplifies the voltage and current, it then feeds the amplified signals to the coil. If it goes bad you have week or no pulses to the coil resulting in poor or no spark to the plugs.

In the GM they tend to fail more often when they get hot, then start working again when it cools down. But that's no guarantee the ICM can be tested at local parts stores, but again passing a bench test does not always mean they are working under actual heated conditions. (ICM caused PCM input to go bad) but there is no DTC for the output to the coil not working, just a no start, or poor performance.

If it is a bad ICM, stay away from the cheap ICM's, this is one part that I'd bite the bullet on and pony up the $$$$ at the GM dealer for genuine. If you go to a discount GM dealer it will only be about $30 more then the cheap one's at auto parts stores.

In short, Ignition Control Module is the brains behind the spark plugs. The ICM tells the spark plugs when to fire and lets the engine know when gas needs to be released for proper engine ignition. Sometimes if your ICM is out or going bad, you may be able to start your motor up nicely once and then when you turn it off it may not start back up.

Hope this helps clear a few things about ICM's

Molson02536

thank you so much!!!!! ive tried everything to find out what was wrong and so i took your advice and went and bought the ICM today and installed it today and started it up and it purred like a kitten got up to temp and never died so me and my dad drove it about 30 miles and it acts a whole lot better it runs better and idles excellent i would still have a headache if it wasnt for you and i hope this thread helps someone else with the same problems!!!: