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1991 s15 jimmy, and sometimes it runs rough sometimes

I have a 1991 s15 jimmy, and sometimes it runs like it's showroom new and sometimes it runs like i'm trying to burn water, the problem happens when it's summer or winter, i replaced feul pump, filter, and tank, plugs, wires, cap and rotor. what gives?

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I got a 1994 gmc s15 jimmy with the vortec 4.3 it idles rough but whaen i drive it give it gas it runs great what would cause that.


sounds like it could be a problem in the IAC circuit. The Idle Air Control valve manages how much air gets into the engine while @ idle. It receives commands from the ECM based on inputs from at least the mass air flow, coolant temp, throttle position and oxygen sensors

Sep 29, 2009 | 1994 GMC Jimmy

1 Answer

Where is the fuel pump relay for a 1991 gmc jimmy?


  • HOME bc_arrowbullet1.gif
  • REPAIR INFO bc_arrowbullet1.gif
  • COMPONENT LOCATIONS bc_arrowbullet1.gif
  • COMPONENT LOCATIONS RESULTS
Relay - Fuel Pump 1991 GMC Truck S15 Jimmy 2WD 4.3L TBI 6cyl The Relay - Fuel Pump Under hood, driver side, upper firewall, mounted in relay block

Jul 02, 2009 | 1991 GMC S-15 Jimmy

2 Answers

1991 s15 4.3 TBI jimmy will not idle


Might just be the timing is off a bit, turn your distributor or if it has a carburator, the choke might need to be turned up.

Mar 18, 2009 | GMC S-15 Cars & Trucks

1 Answer

Timing specs


Connector is under right side dash under heater box. It may be tucked under carpet. Wire is tan w/ black stripe. Base timing is 0 TDC with engine warm and connector unplugged.

Feb 07, 2009 | 1991 GMC S-15 Jimmy

1 Answer

What to set timing using timming light


0 degrees BTDC would be the spec , there is a brown w/tan tracer wire near the distributor , you have to disconnect the connector before setting timing

Feb 06, 2009 | 1991 GMC S-15 Jimmy

1 Answer

Washer pump for winshield doesn't work


This should just push into a grommet in the washer fluid reservoir. I hope this helps!

Jan 30, 2009 | 1991 GMC S-15 Jimmy

2 Answers

JUST DONT WANT TO RUN


Check the fuel pump.

Jan 09, 2009 | 1991 GMC S-15 Jimmy

1 Answer

FEELS LIKE GETTING NO GAS


cHECK THE FUEL PRESSURE AT THE RAIL. iF LOW i WOULD CHECK THE INLINE FILTER AND THEN A POSSIBLE PUMP

Jan 09, 2009 | 1991 GMC S-15 Jimmy

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