benefit by seafoaming 1991 pickup 22re
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08-02-2013, 11:16 AM
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Yes, take off the plenum (and once you get a look at it, you'll probably want to clean the lower intake manifold too). As you can see, the plenum is an odd shape, so it is not easy to clean inside it. I'd recommend removing the "end caps" (which appear to just be freeze plugs), but pick up replacements first (the only way I know to remove freeze plugs destroys them). Get a bottle brush that you will throw away. Soak the entire plenum overnight in a strong solution of dishwasher detergent, then go at it.
You don't want to get water anywhere near the TPS (or anything else electrical), so I'd recommend removing the throttle body and doing that by hand.
You'll need a throttle body gasket, and the gasket that goes between the plenum and the lower intake manifold. If you clean the lower, you'll need intake gaskets. If you remove the lower to clean it, you'll have to remove the fuel rails, so you will need a set of "crush washers." These are dealer items, they're about a buck apiece, and NO, you can't reuse the old ones. No matter what anyone on this list says (unless you're happy taking the chance on dying a horrible, fiery, death. Then go for it!) Once you remove the lower manifold, you might as well replace the injector oring/seal sets.
Why go to the trouble? At least on mine, there was a huge amount of "gunk." Enough that it actually blocked the vacuum ports to the AC and PS idle-ups. If it had gone any farther, it would have blocked the EGR inlet tube, and then I couldn't have passed smog.
All in all, a worthwhile (but messy) job.
You don't want to get water anywhere near the TPS (or anything else electrical), so I'd recommend removing the throttle body and doing that by hand.
You'll need a throttle body gasket, and the gasket that goes between the plenum and the lower intake manifold. If you clean the lower, you'll need intake gaskets. If you remove the lower to clean it, you'll have to remove the fuel rails, so you will need a set of "crush washers." These are dealer items, they're about a buck apiece, and NO, you can't reuse the old ones. No matter what anyone on this list says (unless you're happy taking the chance on dying a horrible, fiery, death. Then go for it!) Once you remove the lower manifold, you might as well replace the injector oring/seal sets.
Why go to the trouble? At least on mine, there was a huge amount of "gunk." Enough that it actually blocked the vacuum ports to the AC and PS idle-ups. If it had gone any farther, it would have blocked the EGR inlet tube, and then I couldn't have passed smog.
All in all, a worthwhile (but messy) job.
Last edited by scope103; 08-02-2013 at 11:17 AM.
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