Re: 91 Burb w/ 7.4L

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Posted by 92sub ( on 10:46:29 07/18/07

In Reply to: Re: 91 Burb w/ 7.4L posted by Frankenbiker

Agree that clogged EGR passages could also pose a problem. I wouldn't expect that type of issue to only manifest while towing but 'stranger things' have happened.
Fords were terrible for plugged EGR passages. I used to cut a length of old speedo cable and chuck it in a drill and 'whip' the intake passages into submission. Start the engine with the egr off (warning! engine will rev high very very quickly - be fast on the key!) a couple of times to blow out the chunks. You can test yours for clogged passages by pulling up on the egr valve while the engine is idling. If it stalls, you egr flow is probably good.

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