Mechanics

QUESTION P0401

1999 Isuzu Rodeo

Other Category problem
1999 Isuzu Rodeo Question 6 cyl Two Wheel Drive Automatic 139000 miles

I keep getting the EGR flow is insufficient. I replaced the EGR Valve, blew out the line and sprayed carb cleaner in it. The code keeps coming back. Is there a sensor that could be bad or a better way to clear out the line?
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Presbell
January 28, 2008.




Does the egr valve work? Try applying vacuum to it and see if the idle changes. Double check all the vacuum lines. If your still having trouble tomorrow I will check to see if there are any bulletins, and I will look up that system. Its hard to memorize every egr system in every kind of car. I will check back to this post tomorrow. Hope this helps

Tiny
Mastertechtim
Jan 28, 2008.
Good luck applying vacuum to that valve.

This vehicle uses the same digital egr valve that gm uses on its 4.3 vortec motor.

2 things

1. Did you use an oem valve with a new gasket?

2. Chances are the egr passage is blocked close to the intake side. Blowing into the passage will not help, the intake will need to be removed and cleaned.

Tiny
Lostinmars
Jan 28, 2008.
I just looked that up. It is the gm style one(im glad someone is keeping an eye on me) there are a couple of other things I would check. Lightly pull on the wires at the plug to see if one is broken inside the insulation, (very common) also you can remove the valve and have someone start the car for a split second, if the passages are ok there will be a loud exhaust noise and a high idle. Ive never had to remove the intake to clean the passage ways, I just break off the chunks of carbon and blow out the passage way. They updated the egr gasket with a new one with a screen on it, id use that one. Check back with us.
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Tiny
Mastertechtim
Jan 29, 2008.
A piece of coathanger works well on the ports.

Merlin2021
Feb 2, 2008.
Thanks for all the advise, how far should I be able to stick a coat hanger down in? Should there be resistnace at a certain point or should it just go all the way?

Tiny
Presbell
Feb 3, 2008.

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