Question about 1999 GMC Jimmy

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Where can I get a diagram on the polusion pump on a 99 jimmy 4x4

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You can get at the place you purchase the product or when you buy the pump you may fined it inside the pack.

Posted on Aug 25, 2010

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My 99 GMC Jimmy has the service 4X4 light on and


I own a Jimmy and have done quite a bit of 4 wheel drive repair on it.
The first thing i would check is the 4x4 selector switch. I know for a fact that these will throw a service 4x4 code if they are unplugged or shorted. They sell for 50-60$ or you may find one at a local salvage yard for cheaper. Taking this out and checking it only takes a few seconds, just simply pop the switch out of the dash with the edge of your pocket knife. After you get it out theres a few more tabs surrounding the back plate, and this is where the circuit board is located. I would inspect it visually to make sure nothing looks corroded and also take a sniff of it to insure there isn't a burnt smell. If it were the 4x4 actuator the lights would still illuminate on the selector switch, it just wouldn't engage the 4x4. You'r problem is all electrical trust me .

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What would make my 1999 gmc jimmy turn over but not start


What size engine? You need spark while cranking and fuel pressure thats the basics we can work from there.

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1 Answer

97 JIMMY,PUSH 4X4 BUTTON,NOTHING HAPPENS


I had the same problem with my 99 Jimmy. try to disconnect your battery for about 5 minutes and see what happen. it fixed mine by doing it.

Feb 05, 2009 | 1997 GMC Jimmy

1 Answer

Will not start


have you tested the fuel pump yet? you do not need to remove it to do so.
if you have not tested the fuel pump yet, test for fuel pressure at the fuel test port on the fuel rail. if you have no fuel pressure, then test for voltage at the fuel pump fuse and relay. if all is well, and your final test for voltage at the weather pac terminal above the tank is good, then you should replace the fuel pump assy, or the wire leading to the pump itself in the tank. 99-01 gm vehicles have a poorly constructed fuel pump wire which tends to cause intermittent connectivity.

to get to the fuel pump, you will need a fuel line tool ( cheap and redily avail) used to diconect the snap over lines from the pump assy. there are two large straps holding the fuel tank in the vehicle, and the tank will need to be removed in order to get the pump assy out. there are two weather pac terminals on the top of the pump assy, and two fuel lines that will need to be removed. finally, the pump is held in the tank by a snap ring. after removal of the snap ring, the unit should lift easily out of the tank.

Jan 15, 2009 | 1999 GMC Jimmy

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