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1994 gmc 305 intake gasket - Cars & Trucks

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6ya6ya
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Posted on Jan 02, 2017

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Molson02536
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SOURCE: how hard is it to replace a intake gasket on a 1994 olds cutlass supreme.3.1 6 cyclinder

It is not an extremely difficult job. time consuming consuming... I've done a 3.4 intake manifold job, which in my opinion (plenty will disagree) is a little easier than a 3.1 manifold. there are just more steps involved with the 3.1 intake.(I haven't had to change the intake gasket on my 3.1 (yet)) If you haven't already, invest in a haynes or chilton manual, whip out your sockets and your gasket remover, and prepare to do battle...
oh, as far as how to tell before you break down the engine... are you having any drive ability problems? Surging idle, stalling... try this, take propane torch (DONT LIGHT IT) but open the valve and let the spray the propane around your intake manifold with the engine running. If the idle drops or the car stalls, there is your intake leak. That trick also works with intake cleaner too.

you may have to remove your push rods to put your new gasket on. Just loosen the rocker arm nuts/bolts and pivot your rocker arms out of the way. If you do remove your push rods, push them into some holes in a cardboard box so that you can replace them EXACTLY in the same position that you got them from. To remove old traces of gasket, you may have to get some spray on gasket remover, let it sit 5 min. then get at it with your scraper. (be careful, remember our engines are aluminum, you don't want to scrape too hard and scar the mating surface).  
After you get all the old gasket off, clean the mating surface with intake cleaner or lacquer thinner. your gasket kit may have come with end seals. if it did not, remember to run a line of RTV sealant on the front and rear ridges of the engine block between the heads (before you install the intake gasket.)

When you re-install your lower manifold, coat your bolts with pipe thread sealant. when you install the lower manifold, tighten the vertical bolts first, then the angle bolts- it will keep the manifold from wiggling around on the gasket.

After you get everything back together and all snug, i would buy some GM top engine cleaner (liquid)(dealer only( part# 1050002) or some sea foam from your local parts retailer. I know this is to clean the carbon and sludge from your intake and your cylinders, but guess where the remainder of the solution ends up? Yep, in your oil. That should clean up any residue you had from the milkshake effect.

To use the GM engine cleaner, just disconnect your favorite vacuum hose leading to the intake (some people just use their brake booster hose) and put it down in the bottle of liquid while the car is running. (don't let the vacuum **** the liquid too fast, you don't want to risk problems. you may have to keep your hand on the throttle to keep it running. when the can is empty, let your car stall or just cut it off. 

Let your car sit about 2 hours, to give the cleaner time to really work. Start your car, let it run for about 20 mins (there will be PLENTY of white smoke, your car is burning off the cleaner and the carbon).

Then change your oil. good luck and hope this helps.

Ok, you're going to need to buy, borrow, or rent a torque wrench. For 3.1 engines 1995 and earlier, rocker arm nuts should be torqued to 18 ft-lbs.

The wire brush probably did less damage than I do on a regular basis with a gasket scraper :D so you should be okay. If you've already drained your oil, (which I suspect you have) then I would just use the wal-mart brand while you do the GM engine cleaner thing. 
  Don't add the cleaner to your oil, just let a vacuum hose, **** it into the intake. Plenty will get in your oil. Getting into your oil and cleaning up the gook is just a fringe benefit. What the cleaner actually does is it cleans up your entire intake path (manifold, injectors, & valves)... I think you'll be happy with the throtle crispness, once you're done with the engine cleaner. 
Oh and for your coolant system, just get some Prestone radiator flush, and follow what the bottle says. If your system is really gooped up, Prestone also has a Super flush for a little extra :2cents:


Posted on May 02, 2009

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SOURCE: I CHANGED MY INTAKE GASKET ON MY 1994 GMC K1500 W/

hey tim,
be sure to bypass the (est) system by unplugging the tan wire with black stripe under the relay cover on passanger side firewall. good luck!

Posted on Nov 04, 2009

  • 1857 Answers

SOURCE: 1994 subburban.5.3Lthink maybe got a bad intake gasket

these engines are known for intake gasket leaks and head gasket leaks.

Do a search on dextron gm coolant ( the orange looking stufff)

This coolant is very corrosive and GM has had lots of complaints.

Best bet is to go have yout truck inspected.

Posted on Feb 10, 2010

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  • 172 Answers

SOURCE: replacing aan intake gasket on a 97 gmc sierra

average around 500 cost at a shop

Posted on Apr 16, 2010

  • 1509 Answers

SOURCE: replacement of intake gasket vortec

they leak often as the gasket fails the replacement from felpro hasn't ever failed for me. The job is that the bolts out and put them back in. things to be careful abut are drain the coolant first and only change the oil when your finished and start and warm the engine for just a few minutes with out the coolant in it and then shut it off for a fem minutes and then go over all the bolts again with the tourque wrench as the heat and cool will seat things a little then after its sit at least another 10 minutes put in your coolant, Be careful with the EGR valve too as it has a temperture senser thats easy to break in the side of it and there not avaable as a replacement part and their real expensive if you can find one. the coolant temperture senser is easy to break off too, but I recomend a new one of these anyway. If the engine has ever overheated at all the senser and the therostate should be changed as general service anyway. as their both easyly damaged by overheating.

Posted on Sep 19, 2010

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'94 Gmc Sonoma 4.3L Starts loosing Power and making weird Rattle Noise when reaching operating temperature. Also water tank looks like there is a bit oil in it. Could it be the cylinder head gasket?


Oil in the coolant is usually an intake manifold gasket problem on these engines. If a head gasket failure the engine will normally overheat and give erratic temp guage readings. Make sure the oil level is full. Is the rattle noise coming from the engine? Some times the exhaust (converter) will fail and the catylist will seperate causing a rattle noise from the exhaust and plug it up giving a no power situation

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94 GMC Suburban. Replaced intake manifold, now runs poorly.


You may not have sealed the manifold correctly,mistakes like using the rear and front rubber seals can cause this instead of a bead of silicone. To check for intake leaks spray carb spray along the intake gasket to see if the engine changes tone or idle speeds, if it does you have a leak,.

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Coolant leaking from 1994 Sonoma. Is not near the water pump or radiator, but more towards the back of the block. What might it be?


It could be a heater hose, an intake manifold gasket, or a rusted through freeze plug. You must "look" to see where the leak is originating from.

Jan 02, 2012 | 1994 GMC Sonoma

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What type of Flywheel do I need for a 1994 GMC Sierra SL 1500 automatic 4.3l V6 305?


It's not a flywheel, it's a flex plate that bolts to back of engine. Why do you need one? If your starter is grinding it needs a starter drive (bendix)

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I have a 1996 Chevy truck 305. I have a misfire problem on #6. When I pulled the plug out it had some water in it, but only if it sits for along time. I have tried a new plug, a non-flower, any suggestion...


have the intake gaskets been replaced yet? if not then it might be antifreeze coming from the intake throught the intake valve or worst case scenario it could be a head gasket leak,most likely it is the intake gasket,hope this helps

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1994 subburban.5.3Lthink maybe got a bad intake gasket


these engines are known for intake gasket leaks and head gasket leaks.

Do a search on dextron gm coolant ( the orange looking stufff)

This coolant is very corrosive and GM has had lots of complaints.

Best bet is to go have yout truck inspected.

Feb 10, 2010 | 1999 GMC Suburban

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Do I need to break into the A/C lines of a 1994 GMC Safari with rear air, when I replace the lower intake manifold gasket? The engine is a 4.3 EFI with throttle body injection.


No,if possible ,remove ac compressor,and move it out of the way,unbolt any hold downs on the ac lines,just move it enough to remove the intake.

Jan 29, 2010 | GMC Safari Cars & Trucks

1 Answer

1994 GMC Safari. Rear a/c unit. I want to replace


It is not necessary to remove the ac lines for removal of the intake manifold.Remove the bolts that hold the ac compressor and it will allow enough room to access the intake.Make sure you mark the location of the number one cylinder on the distributor before removal.

Jan 29, 2010 | 1994 GMC Safari

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I CHANGED MY INTAKE GASKET ON MY 1994 GMC K1500 W/ 5.7 LITER.CHANGED CAP/ BUTTON, PLUGS,SINCE DOING THAT MY TRUCK RAN FINE THEN STARTED TO HOG UP AND STALL WHEN GIVING GAS.WE SET TIMING AT 0 DEGREES...


Hi Tim,
Please check that there is no leakage in your water cooling system. If there is leakage, it causes the engine to heat up and burnup the gasket. You need to make sure your thermostat is also reset properly depending on the weather condition in Maine.

Kind Regards & Best Wishes

Oct 19, 2009 | 1994 GMC Sierra

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