Engine/Transmission (1994 - 1998) Egr Valve Repair

[BLUEDOT 72]

IS there anyone out there repairing EGR Valves for the 1998 12 Valve Engine?

 

[SRadke]

EGR? Exhaust Gas Recirculation? They don't have it.



-Scott

 

[Cooker]

EGR? Exhaust Gas Recirculation? They don't have it.



-Scott

The California models did.



To answer the question, I would not repair it, but rather remove it. I don't know all that is involved since I have never done it but you will need a non-

EGR intake manifold.

 

[Buck88]

Get an Arc Flow and a three piece manifold from ATS. That will solve the problem. On the EGR models the exhaust manifold is more restrictive then the non-EGR's.

 

[jtwcummins]

Trash can worked for me. Installed ATS exhaust and Twin-Ram intake. Bet you have an intake FULL of soot. Best bet is block Vac line to the valve, if you get a 'chack engine' let me know I will explain how to trick the ECM

 

[Buck88]

What's the trick? I had the vac line off, but I hate having the "Check Engine" light on. Even if I know why it's on. But having that disconnected will disable the EGR or what? Thanks, Buck

 

[ScottLewis]

Jay's trick to fool the EGR trouble code works great. My BD brake on my '98 would open the EGR valve (back pressure). The kit from BD put pressure instead of vacuum in the EGR, keeping it closed while the brake was engaged. Problem was, the presssure blew out the diaphram, twice at $260 each. I blocked off the EGR with plates at each end of the EGR tube and used Jay's method to fool the PCM. No EGR valve opening and no code set. I did have one problem in extremely cold weather because the fix didn't allow the PCM to know when intake air was really cold, thus not enough heat to grids and fuel heater. Fixed that too.



Dan

 

[jtwcummins]

The ECM is looking for a 10* increase in intake air temp and sets the code if this doesn't happen when the EGR is open. After the engine is about 140* the EGR opens and stays that way all the time except wide open throttle. What I did is remove the plug from the EGR vac valve and use the 12v to pick up a double pole singe throw relay-from Radio shack. To make it possible to reconnect I used short pieces of a large paper clip with wires soldered to them and pushed in to the connectors. Did this on IAT plug also.



I removed the connector from the IAT sensor and found the 5v line from the ECM. I wired this to the common connection on the relay. To the NC relay contact connect about an 10k 1/4 watt resistor . On the NO side I went with about 6 k resistor. Easy way is connect resistors to the relay contacts and then solder the other ends together and attach a wire and run to the open connection on the IAT. . The lower the resistance the higher the detected temp. As Dan said, this works great in Calif but you might need to increase the resistance to move the temp lower. This signal is also used to cycle grid heaters. If you keep the spread at about 4-5k ohms you should be able to get more cycling in colder weather. A couple of small pots will let you dial in for the season.



The EGR vac solenoid makes a great control for the front axle on 4x4s. Can turn of vac so low range can be used backing trailers w/o engaging the front axle.