Since I got my truck 3 years ago the check engine light has come on for a few weeks, off for a day or so, etc. Now its been on for about 6 months, pulling "EGR malfunction" code. I have a pretty good feeling the solenoid is bad, I forget the resistance I pulled off the solenoid, something like 45 ohms maybe. There are no other sensors on the system (lack thereof....) so it must be the solenoid or bad wire.

Does anybody have a functioning EGR (solenoid) they can take a resistance measurement off of? Or perhaps a spec from a manual etc? New solenoid is big $$$ versus a resistor bank for a dollar or two.

Thanks for any help.

 

Anybody? I know most of those who have the egr models deleted them, but I want this light off before it burns out!

 

There was an EGR installed on a 12-valve?

Never heard of this, and i've been on here almost 5 years.

 

Yeah, thats news to me also.

 

CA 12v's came with EGR in 1996. But not mine, I slipped right under the wire.

 

Yeah my 96 doesnt have one either.

 

correct, 96-98 CA pickups had egr. i believe it came in effect jan 1 1996, which would explain why some 96's dont have it.

 

Mine has it. 98 12v.

Hijacking....if I replace the exhaust manifold and delete the egr, will the light be permanently on?

 

I removed the EGR system on my 97 12v. I don't have a check engine light but I do get an EGR code with my OBD scanner.

 

There is a picture of the EGR in an older issue of Diesel Power - the duallie they use as "Project 12v"

 

I don't understand why my truck has (had) it... it was bought new in 97 in New Hampshire. It must have been shipped from Mass., which seems to accept all of Ca. emission standards. Its a rather crude design, a 1" wrapped exhaust pipe from the back of the header around cylinder 5 up over the valve cover to a vacuum valve, back into the cast aluminum intake above the pump kinda. No sensors like the pintle sensor and flow sensors on some gas engines, just a solenoid controlling vacuum to the EGR valve.

You shouldn't throw any codes if you cap the vacuum line to the solenoid-valve, as long as it's still plugged in. I capped the exhaust and intake ports and removed the pipe because the inside of the pipe was corroded and very flaky.

PS JohnX since your hijacking...feel like taking out the meter and measuring resistance on the two terminals on the solenoid?

 

I had planned on it, then I couldn't find the thread again.

Be back in 5 with results!

 

44.5 ohms. Sensor is a dealer replacement which is only about 3 months old, should be perfect.

 

Thanks!

 

Do a search for EGR delete. A while ago I PMed the guy that had a drawing of the circuit he made to fool the computer when the EGR had been deleted.
If you can't find it PM me and I'll e-mail it to you.

BTW I had my air horn off last weekend and it had at least 1/8" of soot all the way around the inside. I cleaned it out and the truck runs much better now.

After that experience I want to get rid of my EGR valve too. It will make valve adjustments much easier too.