EGR Valve Symptoms
Senior Member
Joined: Jun 2003
Posts: 186
Likes: 1
From: Biloxi, MS
The EGR valve opens under high heat to allow exhaust gas to reenter the combustion chambers to help cool the engine. a faulty EGR valve may not open. sometimes it can be a loss of power almost like a miss. Most of the time the DPFE sensor is the culprit. to test the EGR valve, crank the truck and leave it in park. now put a piece of aquarim tubing or gas hose on the EGR valve where the green vacuum hose is plugged. suck on the end of the tubing, the truck should begin to stubble as if it is going to die. if this happens, the EGR is good.
But, if your EGR ports are clogged, the truck will not stumble. you can put your finger under the EGR Valve and suck on the hose, you should feel the valve moving on the inside. make sure the engine isn't too hot when you do this, as the EGR valve gets extremely hot from the exhaust gases. if you don't feel the valve move and the truck did not stumble, then you could very well have a faulty EGR.
remember, the DPFE sensor actually detect how much the EGR is too open. it sends a signal to the PCM which then sends the correct amount of of voltage to the EVR solenoid. this is what opens the EGR valve. The DPFE sensors are famous for clogging up with some type of white grease like crude.
hope this helps.
But, if your EGR ports are clogged, the truck will not stumble. you can put your finger under the EGR Valve and suck on the hose, you should feel the valve moving on the inside. make sure the engine isn't too hot when you do this, as the EGR valve gets extremely hot from the exhaust gases. if you don't feel the valve move and the truck did not stumble, then you could very well have a faulty EGR.
remember, the DPFE sensor actually detect how much the EGR is too open. it sends a signal to the PCM which then sends the correct amount of of voltage to the EVR solenoid. this is what opens the EGR valve. The DPFE sensors are famous for clogging up with some type of white grease like crude.
hope this helps.
Thread Starter
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Member
Joined: Dec 2003
Posts: 35
Likes: 0
From: Oceanside California
Plug! The truck only misses and pings when the truck is cold. Even once the engine warms up it still misses and pings until the engine compartment warms up, then the truck runs fine. Could this be the EGR? Is there anything else I should be looking at? Thanks for your help.
Member
Joined: Nov 2003
Posts: 92
Likes: 0
From: Panama City, FL
Hymis, you have a significantly different engine than stock, so any number of things in the ECM could be causing your cold engine driveability problems.
Other than the EGR (system), which could cause pinging, but normally on a hot motor, you might check the plugs. From what I've seen and heard, do not use anything other than Motorcraft platinums, and when you replace them, use the doubleplats.
Good luck!
Other than the EGR (system), which could cause pinging, but normally on a hot motor, you might check the plugs. From what I've seen and heard, do not use anything other than Motorcraft platinums, and when you replace them, use the doubleplats.
Good luck!
Senior Member
Joined: Jan 2003
Posts: 150
Likes: 1
I would suggest posting your questions in the Lightning forum.
There are lots of people there that have added superchargers to the Gen1 naturally aspirated engines. They have alot of experience troubleshooting the bugs that go along with them.
Make sure you tell them what year model your truck is,, there is alot of difference between the older eec5 and the OBD-II systems.
There are lots of people there that have added superchargers to the Gen1 naturally aspirated engines. They have alot of experience troubleshooting the bugs that go along with them.
Make sure you tell them what year model your truck is,, there is alot of difference between the older eec5 and the OBD-II systems.
