Dreded ERG valve

Discussion in 'PA- Keystone Cruisers' started by Rics4rnr, Nov 12, 2018.

  1. Rics4rnr

    Rics4rnr

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    So I decided to work on my 80 to tackle the dreded P0402 code for the ERG valve. I read alot of threads about the ERG problems so purchased upper plenum gaskets, throttle body gasket, and the ERG valve. After taking the upper plenum apart I found the port from the throttle body to the ERG port had carbon build up. Now after cleaning the intake pleum the truck accelerates so much better.

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    Pacer, Cass007, dci blair and 2 others like this.
  2. Pacer

    Pacer SILVER Star

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    That's great, is that all it was?
    That truck was fast even when I had it.
     
  3. Rics4rnr

    Rics4rnr

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    Yes it took a while to figure out the problem and I tried everything from cleaning out the carb, Seafoam treatment, and replacing the vacuum hoses. So the last resort was to do upper intake removal and cleaning. I also cleaned out the lower plenum and after putting everything together you can tell the difference during acceleration.
     
  4. brian

    brian SILVER Star

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    How much crap was in the plenum?
     
  5. Rics4rnr

    Rics4rnr

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    Well the ERG port was pretty much clog and about 1mm of crap in the plenum. I used 3 cans of throttle body cleaner to get most of gunk out. I wish I took some pictures but you how it goes you get busy trying to find everything back together.
     
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