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Posted on Jan 02, 2017
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
I've replaced several of these gasets and they were made that way.
It wouldn't hurt to call a different autoparts store and ask them if theirs are made that way.
Posted on Jan 07, 2009
This is basicly a very time consuming job rather than a physically hard one to complete. In order to replace the gasket you must remove the intake plenum,throttle body, and misc. vacuum hoses. The wiring harness connections must also be disconnected. Finally the intake manifold is exposed. The bolts holding the manifold to the block are removed exposing the leaking gasket. After removing the push rods and placing them in the correct order to be replaced the gasket and sealants can be removed. Finally replace everything in reverse order. Be sure to consult a GM manual for correct bolt torch specs. The correct specs for the manifold bolts usually come with the gasket. Make sure to change your oil a few times after this job in case any coolant entered the block. Also,change the thermostat and the oil seal on the distributor half shaft cap while you have everything off. Good Luck
Posted on May 12, 2009
SOURCE: intake manifold gasket / replace
NOTE The 3.8L (VIN K) non-supercharged engine uses a two-piece intake manifold consisting of an upper air plenum which mounts the throttle body and a lower intake manifold assembly which houses the fuel injectors. The 3.8L (VIN 1) supercharged engine uses a similar lower intake manifold. The supercharger serves as the upper manifold.
NOTE Two bolts which fasten the lower intake manifold to the cylinder head are accessible only after the upper intake manifold is removed. These bolts are located in the right front and left rear corners of the lower intake manifold. Remove the upper intake manifold to service the lower intake.
The 3.8L (VIN 1) supercharged engine uses a manifold similar to the 3.8L (VIN K), but the supercharger serves as the upper manifold.
Fig. Lower intake manifold bolt torque sequence-3.8L (VIN K) engine
Upper Intake Manifold (Plenum)
NOTE Two bolts which fasten the lower intake manifold to the cylinder head are accessible are accessible only after the upper intake manifold is removed. These bolts are located in the right front and left rear corners of the lower intake manifold.
Fig. Upper intake manifold and bolt torque sequence-3.8L (VIN K) engine
Posted on Sep 16, 2009
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