Question about 1991 GMC S-15 Jimmy

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I have a 91 gmc jimmy 4wd and the vaccum line that goes on top of the engine block under the breather fell off and i cant find it now were and the jimmy shakes like everything is that what it could be and what is this part called and how much would it be at like autozone or carquest

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If it shakes try replacing the distributor cap, the pin in the center wears down and jumps causing eratic engine shake (get the genuine GM one it seems to be more precise and smoother running engine) also make sure your spark plug wires aren't broken, or breaking.

Posted on Sep 18, 2010

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Posted on Jan 02, 2017

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2 Answers

Vortec oil pump on a gmc jimmy


Don't start the car !!!

Can you see the part from the whole where the distributor goes ?
If you can you may be able to fish it out.
Your distributor has a drive shaft that goes from the dist to the oil pump in the oilpan.
Hopefully it is sitting on top of the shaft.
Their are know oil lines at the bottom of you engine, everything is internal.
If you cant fish them out from the top, the oilpan will have to be removed.
I think your best bet is to try to remove the pieces from the dist hole with a magnet on a shaft or maybe very sticky tape on a shaft.
Good luck, Robert

May 05, 2017 | 1999 GMC Jimmy

1 Answer

Will not shift into four wheel drive


I had this same problem on my 96 Jimmy.Check under the hood for cracked vaccum lines. You may have a vaccum line that is letting vaccum escape and not allowing the 4WD to engage.
Tony www.1aauto.com

Feb 08, 2011 | 2001 GMC Jimmy

1 Answer

NO 4X4, TRANSFER CASE ENGAGES BUT FRONT DIFFERENTIAL NOT WORKING


There is a vacuum line that goes to the transfer case.if this line is ruptured it will not engage the 4wd.Next there is a switch on the t-case that may not be working.In 4wd it supllies vacuum to the 4wd actuator that is under the battery tray.next the applied vacuum pulls the cable engaging the frontaxle.

Dec 02, 2010 | 1996 GMC Jimmy

1 Answer

Egr valve fail


Top back part of motor. It has a vaccum hose attached to it. Then there is a pipe that goes from egr to exhaust. Can't miss it.

Mar 31, 2010 | 1994 GMC Jimmy

1 Answer

Where is the fuel filter on my 2001 jimmy 4dr


2001 GMC Truck Jimmy 4WD 4.3L SFI 6cyl
The Fuel Filter is located under vehicle, driver side, below seating area, near fuel tank, mounted on frame rail in fuel line .

Good luck (remember rated and comment this help).

Mar 23, 2010 | 2001 GMC Jimmy

2 Answers

Front end will not lock in 4x4


if you crawl under the vehicle, trace vacuum lines to transfer case they terinate in a group of 3 (vent, vacuum from engine, line to actuator diaphram under battery) . Mark lines (bundle should have a pin to prevent bad replacement, but be safe) pop 3 hose unit , unscrew switch (count the turns to return it to same position). Transfer case side has a ball that should detent fairly easily. If stuck, work it loose or replace the switch. This manual detented switchsimply routes vacuum to diaphram which pulls cable to front axle, or vents it to atmosphere when in 2wd.

You should be able to feel if diaphram is pulling in when in 4wd and is relaxed when in 2wd mode to troubleshoot. Direct vaccum to diaphram line to test. I have used aquarium airline tubing and airstone manifold to provide quick fix when a garage and/or access to parts was not available. You want to be able to direct vent to diaphram for 2wd and engine vacuum to diaphram for 4wd.

Mar 17, 2009 | 1998 GMC Jimmy

2 Answers

1995 gmc jimmy will not shift out of 4wd high


sounds like the vacuum lines are either pinched or the vacuum pump is shot. try getting a mechanic look at the lines on and around your transfer case... also try checking the fuses for the 4wd selector. let me know how it goes

Dec 26, 2008 | 1999 GMC Jimmy

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