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98 Silverado 5.0L K1500 intermittant P0404 code?

Hello all, Twice in the last month the Check Engine light came on for 3 days or so, then went back off. I scanned it and obtained the P0404 (EGR Flow/Performance) OBDII code. This truck uses a linear electric EGR valve instead of the vacuum driven style that I have dealt with in the past (83 Elcamino). I was wondering if anyone had any luck cleaning these and what the odds are that the code may be caused by another problem or sensor out of tolerance. I have yet to experience any stalling or hesitation. The idle is a tad rough at times but I don't hear any miss at the tail pipe. Truck currently has 38,000 miles. Cheapest price for this EGR valve I have found is $100 and I believe GM's was $160.

Any words of wisdom, experience, and opinion welcome. Thanks in advance, Mark

Reply to
Antennaman
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Reply to
Jeremy Bomkamp

Thanks Jeremy for the response.

Now that you mention it, the light did come on the first time after topping a hill and coasting down the other side. The second time was coasting toward a turn off on the highway. The light has been out for the last three days now with no troubles. When I get the chance I think I'll give cleaning a try and give the connectors and wiring another look. Earning a living as an electronics technician in another field, I've learned the hard way that error codes can be both useful and misleading. :)

Mark

Reply to
Antennaman

Just clean it with carb cleaner. It worked for me. 98GMC 5.0

Reply to
Marc Porter

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