Service engine soon light

[94burbk1500]

My 94 k1500 burban runs great, but the service engine soon light comes on after about 10-15 minutes of driving. If I turn off the truck and start it again the light is off but comes back on 10-15 minutes later. I have no idea where to start looking since it's obd1. Any suggestions?

 

[ima93chevyguy]

My 94 k1500 burban runs great, but the service engine soon light comes on after about 10-15 minutes of driving. If I turn off the truck and start it again the light is off but comes back on 10-15 minutes later. I have no idea where to start looking since it's obd1. Any suggestions?

Probably the EGR valve, mine was doing the same exact thing and I coded it and that's what it was; just replaced the valve although a lot of people just delete them.

Also you can Google or youtube how to read codes with OBD1 it's really simple, takes like 5 mins.

 

[94burbk1500]

Probably the EGR valve, mine was doing the same exact thing and I coded it and that's what it was; just replaced the valve although a lot of people just delete them.

Also you can Google or youtube how to read codes with OBD1 it's really simple, takes like 5 mins.

You rock, thanks man! The valve is super cheap so I'll just swap it tomorrow and see what happens

 

[evilunclegrimace]

why don't you just pull the codes before you spend money on parts that you might not need? get a paper clip and jumper A&B terms in the ALDL and read the flashes to get your codes.

 

[94burbk1500]

why don't you just pull the codes before you spend money on parts that you might not need? That a paper clip and jumper A&B terms in the ALDL and read the flashes to get your codes.

Not a bad idea, got a link to a walkthrough? I know I can jumper a couple pins together but idk what the next piece is. That being said, an egr valve is cheap and I don't mind replacing cheap parts, it certainly doesn't hurt anything.

 

[evilunclegrimace]

 

[94burbk1500]

Damn, I didn't expect you to actually deliver. Lol. Excuse my ignorance, but what am I looking for once I jumper those pins together? Do I count some sort of flashes or what?

 

[evilunclegrimace]

Take a paper clip an shape it into a "u" and insert it into terminal A and B, turn the ignition to on and watch the CEL. it should flash once followed by 2 more flashes. this code 12 , It tells you that the system is operational. It will repeat 3 times and then move to the next stored code. An EGR code 32 will be 3 slow flashes followed by 2 quicker flashes repeated 3 times. Write the codes down and then look up the diagnostic chart/trouble shooting flow chart and follow it from the top. When you have retrieved all of your codes turn of the key and remove the paper clip jumper.

You will have all of the stored codes when the system repeats its self.( code 12 comes back to the beginning)

 

[94burbk1500]

Take a paper clip an shape it into a "u" and insert it into terminal A and B, turn the ignition to on and watch the CEL. it should flash once followed by 2 more flashes. this code 12 , It tells you that the system is operational. It will repeat 3 times and then move to the next stored code. An EGR code 32 will be 3 slow flashes followed by 2 quicker flashes repeated 3 times. Write the codes down and then look up the diagnostic chart/trouble shooting flow chart and follow it from the top. When you have retrieved all of your codes turn of the key and remove the paper clip jumper.

You will have all of the stored codes when the system repeats its self.( code 12 comes back to the beginning)

You're the man. I'll give this a try in a few hours

 

[someotherguy]

You have a wealth of information at your fingertips...simple google searches would show you how to check codes on OBD1.

But let me help: http://www.troublecodes.net/gm/

To repeat previous wise advice, don't just start throwing parts at it. And if you do turn up a code 32 for the EGR, that doesn't necessarily mean the EGR valve is bad (likely, but not 100% proof) - and you also don't want to waste money on a generic parts house EGR valve.

Richard