Bad EGR Valve

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Feb 7, 2011 | 05:35 PM

skidoodave

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Tuned

Joined: Nov 2010

Posts: 426

Likes: 1

From: Caledon ON

Bad EGR Valve

I have a 78 F150 with a 400 in it. The thing would not idle at all, had the carb rebuilt but still sounded like a drag motor with a wild cam in it, very lumpy idle. Thanks to the posts here at FTE I started to look towards the EGR valve as the problem. I checked for vacuum leaks but couldn't find any so I checked the EGR. I got the truck running and it was doing it's usual crap idle, I disconnected the vacuum line from the EGR and put on a long jumper vacuum line. I applied vacuum and could feel the valve move but there was no change in the idle quality. I released vacuum and the valve didn't seam to move back that well. I then applied presure (yes by blowing into the jumper line), this closed the valve and guess what.....the idle picked up by about 400 rpm, it ran perfectly smooth and the vacuum gauge jumped from 10hg to almost 20hg....wow.

I took the valve off and it rattles like a morocca so I think the return spring inside must be broken. The question is are the aftermarket valves any good? I've read on here that some people have had issues. Should I try and source a new Ford one? The part number is D8ZE-9D448-D1A. Maybe Numberdummy can source me a new one.

Thanks

Feb 7, 2011 | 06:52 PM

mikeo0o0o0

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Joined: Apr 2009

Posts: 14,333

Likes: 247

From: Stanley, VA

The number you posted is an engineering number. That crosses over to part number
D8ZZ-9D448-D.
I couldn't locate any NOS but you should be able to get it at NAPA or another parts house.

Feb 7, 2011 | 06:59 PM