Mechanics

SPEEDOMETER TROUBLE AFTER CHANGING INTAKE MANIFOLD GASKET

1999 GMC Jimmy

THE SPEEDOMETER WAS WORKING FINE UNTIL I CHANGED THE INTAKE MANIFOLD GASKET, CAP, ROTOR, PLUG, WIRES, FUEL INJECTORS, AND STATER. WHEN I START TO DRIVE THE SPEEDOMETER IMEDIATLEY JUMPS UP TO 29 MILES PER HOUR AS SOON AS I START TO STOP IT DROPS RIGHT BACK TO 0. TRIED REPLACING VSS BUT THAT HAD NO EFFECT. WOULD APPRECIATE ANY HELP THANKS GARY
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GARY KRUEGER
October 14, 2012.



During removal installation of the manifolds, wireharness have to be removed and probably some ground connections too. Ensure they are correctly and securely reconnected.

KHLow2008
Oct 14, 2012.
WENT OUT AND CHECKED ALL CONNECTIONS COULD NOT FIND ANY LOOSE OR INCORRECTLY INSTALLED ANY OTHER SUGGESTIONS WOULD BE GREATLY APPRECIATED THANKS GARY

Tiny
GARY KRUEGER
Oct 14, 2012.
Try checking for trouble codes first.

KHLow2008
Oct 14, 2012.
THERE ARE NO TROUBLE CODES

Tiny
GARY KRUEGER
Oct 14, 2012.
If no codes are thrown and speedometer is not working, problem should be at the meter cluster.

KHLow2008
Oct 14, 2012.
THE METER CLUSTER WOULD DEVELOP A PROBLEM JUST OUT OF THE BLUE AND JUST SHOW UP AFTER I CHANGED INTAKE GASKETS ETC? THANKS GARY

Tiny
GARY KRUEGER
Oct 14, 2012.
It should not but then again coincidences do happen.

KHLow2008
Oct 14, 2012.
IS THERE A WAY TO TEST THE METER/ CLUSTER? IF SO HOW DO I GO ABOUT DOING IT. THANKS GARY

Tiny
GARY KRUEGER
Oct 14, 2012.
The trouble code P0500 diagnostic procedures should help you on the diagnostics.
Which engine do you have?

KHLow2008
Oct 15, 2012.
THE ENGINE IS A 4.3 L

Tiny
GARY KRUEGER
Oct 16, 2012.
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