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EGR "vacuum silinoid"???

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Nate87k5, Jun 5, 2000.

  1. Nate87k5

    Nate87k5 Registered Member

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    EGR \"vacuum silinoid\"???

    Ok, I replaced the EGR. I wanted to test to see what kind of vacuum it was recieving. I disconnected the vacuum line from the EGR and put on the gauge(this was after the engine was warm) I increased the rpms to 2500-3500 and held it there. The gauge shot up to 18psi and then dropped right away. I did this several times. I then increased the rpms again and watched the EGR diaphram it when up and then fell right away. Next I tested the vacuum coming from the TBI going into the "vacuum silinoid." I removed the vacuum line from the silinoid and placed the gauge on it. It read a steady 18psi at idle. So I'm kinda stumped. I thought that the EGR is suppose to get constant vacuum when to vehicle gets to operating temp. and the rpm reaches a constant rpm of 2500. Now I have replaced the ECM, and the Coolant temp. sensor. I'm wondering if the "vacuum silinoid" is screwed up or maybe its just me. Maybe someone out there can help shed some light on this subject. If I'm not giving enough info. please let me know...Thanks for any help...

    P.S. If anyone knows were I can get a good A/C condensor with no leaks for less than 2 bills I would be in your dept. Seems that I screwed it up when I put in the new radiator. Getting to be 110 here in Phoenix and would like to have my A/C back....I guess I'm getting spoiled.
     
  2. Blazer1970

    Blazer1970 1/2 ton status

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    Re: EGR \"vacuum silinoid\"???

    Yes, it sounds like the vacuum solenoid may be screwed up. The only other possibility is that the ECM is telling it to shut off for some reason. Check the voltage to the solenoid valve, and see if it stays on when the solenoid shuts off. If it does, then you have a bad solenoid.

    Tim

    1970 Blazer CST 4X4 350 SM465 NP205
    1987 Suburban 4X4 350
    1988 Chevy Pickup 4X4 350
     

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