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Old 03-16-2021, 09:01 PM   #1
01SC94SL
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2001 SC1
1994 SL1
Default TBI vacuum hoses gasket

I have a 94 SL1 SOHC. I'm having idle issues. Just rebuilt the engine with all new pistons, rings, bearings, gaskets, timing chain kit, wires, plugs, motor mounts, clutch kit...everything. Head was professionally rebuilt, block was also checked cleaned and cylinders bored out. Crankshaft was sent out and checked. Big vibration at idle and gets less with more gas.

I replaced all the vacuum lines with new firm rubber hoses with no change. I took apart the throttle body. The gasket on the back where the evap, egr sol., and map go into is toast. I'm hoping this is my problem but I can't find the correct new one. I found a throttle body rebuild kit a few places but the review on it says that the gasket for that part that comes with it is incorrect and doest work. Does anyone know the gm part number or somewhere I can get one? Finding anything on first Gen throttle body is hard

Any suggestions or questions are appreciated
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Old 03-16-2021, 11:07 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: TBI vacuum hoses gasket

Tried rockauto.com? The rebuild kit for throttle body injectors comes with gaskets and fuel pressure diaphragm to regulate pressures. Most members here use the kit with success. The injector may be worn out too and leaking. The easiest way to tell if its leaking is turning on ignition, engine off so the pcm cycles the fuel pump then shuts off if the engine isn't started. Look down the throttle bore to check for fuel flowing out the injector. With ignition on, engine off, the injector should be shut off. Any fuel seeping out indicates a pintle valve leak and should be replaced.

Last edited by fdryer; 03-16-2021 at 11:14 PM.
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Old 03-16-2021, 11:54 PM   #3
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2001 SC2
Default Re: TBI vacuum hoses gasket

Pretty sure all you need to do to make the S-Series TB work on the 7.4L BBC is swap the injector. Odd that what sounds like a standard O-ring doesn't swap.
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