Question about 1998 GMC Jimmy

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1998 GMC Jimmy Vortec V6 4.3L 4WD

I need engine schematics for a 1998 GMC Jimmy with the Vortec V6 4.3 L 4WD. Taking apart to fix blown intake manifold gasket. I want to make sure everything is hooked back up properly

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  • Anonymous Mar 15, 2014

    1999 GMC JImmy locked in 4wd low, lights on switch will not come on.

  • Anonymous Mar 21, 2014

    searched around but no luck did they change something that year i have a 1998 and its right up front on the intake manifold both are 4.3 litter engines they look identical.

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I have a 1995 gmc jimmy 4.3 vortec can any one tell me where the EGR VALVE is


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Hot do you take off a 98 GMC 5.7 vortec intake


Note, removing the upper intake manifold is not necessary when removing lower intake manifold, they are removed as an assembly.
Disconnect negative battery cable. Drain cooling system. Remove air cleaner assembly and inlet duct. Mark and remove distributor. Remove upper radiator hose at thermostat housing. Disconnect accelerator and cruise control cables. Remove heater hoses from intake manifold. Remove EGR pipe.
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Installation.
Always use New O-rings when reconnecting fuel lines at rear of engine. Apply a bead of RTV silicone sealer along the front and rear sealing surfaces of the block.See Fig.6. Install new gaskets and intake manifold on block while RTV is still wet to the touch. Use Threadlock 12345382 or equivalent to lower intake manifold bolts. Tighten lower intake manifold bolts in sequence to specification table. See fig. 7. To complete installation, reverse removal procedure.f52665d.gifabc2b5f.gif

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1998 gmc 4x4 runs poorly and sounds like a vacume,air leak .


The 5.0l and 5.7l all have this problem at some time.The lower intake gaskets are bad.and are sucking air which will cause the eng. to idle high and sound like like there is a cylinder or two that are not firing and you also may loose antifreeze.The upper intake is black/plastic and the lower is aluminum.Tightening the lower intake bolts may seem to help but once the gaskets are blown,they need to be replaced.If its sucking more air through the bad gasket than the TBI it will not get the right air to gas mixture.Check that all vacuum hoses are in good shape and the vacuum line that runs from the top of the upper intake to the brake booster is sealed good in the intake.Hope this gives you a better idea.

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