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1991 Chevrolet S10 Blazer Question: got a rough idle and when I try go maintain a steady speed it gets a little miss

 

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travler, Phoenix, AZ, August 17, 2013, 15:23
 Rookie

I have replaced most vacuum lines but the line from the carb to the vapor canister when I take it off it does not change anything no difference?

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    PARTS GUY August 17, 2013, 20:05
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     Master

    It has throttle body fuel injection which the fuel mixture is controlled by a computer.
    If I were to start shooting parts at this Blazer I would put a new O2 sensor in it.
    If you don't want to guess, find somebody with a OBD I scanner software to look at the serial data. unfortunately that also means a PAT(PROFESSIONAL AUTO TECH) that can understand what the data means.

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    travler, August 17, 2013, 20:18
     Rookie

    the only code that came up was map sensor and it all check out ok I replaced o2 sensor tody still the only thing I found puzzling was where they line from the fuel vapor canister goes into they intake on the carp body nothing change when I took it off to check it.

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    PARTS GUY, August 17, 2013, 20:24
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     Master

    The purge system is fed at the throttle body. It goes from the throttle body to the purge control solenoid then to the canister.
    If you had a scanner that will pull codes what did the serial data look like?

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    travler, August 18, 2013, 08:32
     Rookie

    had the codes check and it read map sensor had it check and everything was fine. I'm thinking TBI cleaning and go from there thanks

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    PARTS GUY, August 18, 2013, 08:55
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     Master

    That vehicle will provide more than just codes. What does the data stream look like.

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    travler, August 19, 2013, 16:24
     Rookie

    I pulled the TBI off and cleaned it, was all clogged up seems to run good down, thank you

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