Rough/surging idle

[Ranger4x4.0]

I have a '98 4.0. It surges up and down rapidly, idles very high at 1500 and even 2000 rpms, or just barely running like its coughing at very low rpms and sometimes dies. I think it has something to do with the egr valve, the thing with a round top and a vacuum hose coming out from the top. I sprayed it with starting fluid and the engine surged a little, and is consistent every time I sprayed it. It was always around the gasket on the back of the valve. I changed out the gasket, and went to start it up, and there has been no change. I sprayed it again after replacing the gasket and it still surges. The old gasket was like peanut brittle and thin. I dont know what it could be.

Also, when I changed the gasket, I couldn't for the life of me get the exhaust pipe bolt loose even after sitting in penetrating oil for a day and a half. The 1 1/16 wrench felt too big and kept slipping off as well. So I just took the two 10mm bolts out and pulled the valve back with the pipe connected. I scrubbed where the gasket meets the metal as best as I could and put the gasket on that way. The bolts are as tight as I feel safe without stripping them, and I'm positive it's not a bad gasket.

This is the best example I can find on what its doing: https://youtu.be/0rR30KlLl0s

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[bobbywalter]

that pipe may be leaking as well.


but any ether near the intake will surge it if theres leaks elsewhere near it.


air hose from the filter tight ect?

 

[Ranger4x4.0]

Bump

I ordered a new egr valve. But I need that tube bolt to come loose without damaging the tube itself. Any suggestions?

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[Dirtman]

Bump

I ordered a new egr valve. But I need that tube bolt to come loose without damaging the tube itself. Any suggestions?

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Start spraying it with penetrating fluid now. Squirt it a couple times a day until the EGR valve comes in. Penetrating fluid is your friend!

 

[Ranger4x4.0]

that pipe may be leaking as well.


but any ether near the intake will surge it if theres leaks elsewhere near it.


air hose from the filter tight ect?

I checked all the hoses and fogged the engine with ether. It's only leaking in from the egr and no leaks elsewhere. I'll be replacing the egr whenever it comes in. And whenever I finally take off the old valve, ill be inspecting both pipes coming out and make sure nothing is rusted out. I will also be replacing the gasket again just in case.

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[Ranger4x4.0]

So I've been trying to remove it from the exaust manifold. Still wont budge. I've tried torching it, ive tried 4 different brands of penetrating oil and has sat for 5 days with continuous reapplying. I seriously dont know how to remove this valve.

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