Hi i need help. I took my intake off because gasket was leaking anti freeze. I repair the gasket put every thing back on.its not running right. I didn't mark the position of distributor so i bunt motor over till number one up and turn crank til mark on balance line up on 0 degrees put distributor in. start it not good the i read you have to unhook a wire from under dash then set timing. I did still not running right. i took egr vavle off it working i took iac off it had build up on it. So i took tbi off and clean it without taking complete a part. Put it back on it still not right it has a miss and seems to be runnin rich and it has a spark nock . and i time it with a timing light. Can you help. Todd
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Re: I took a intake off
Check to make sure you have the firing order correct. If so, go ahead and remove each wire to isolate the misfiring cylinder. From what I can understand from your post, it seems that so far, you have done everything correctly. Did it run well before you did the gasket? Running rich can be a product of a vacuum leak as well. To find it, spray some carb cleaner around perimeter of manifold, and near any vacuum source. If idle changes, that's where the leak is! If its leaking from the new gasket, you might consider, loosening up the bolts and re-tightening them in a cross pattern, side to side, beginning at the center, working towards both ends. split the torque value and tighten twice: if value is 30lbs, do once at 15, the second time @20. I hope this helps. Good luck
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Check your intake, sometimes water runs thru the intake to cool it down and it can crack on the inside. When this happens it will send water to cylinders where it is burned. Also, any leaks at the water pump?
could be intake, could be head gasket. take the radiator cap off and fill it to the brim with water, then start the engine and look for bubbles in the water. you might have to top it off while it's running to get a good reading. if any of the plugs you took out were much cleaner than the rest, or had a white crust deposit on them, the head gasket is probably the culprit.
Sometimes, not the heater coil...this leak usually smells inside the cabin...can you see anti-freeze build up anywhere? These motors are more prone to a water pump leak (needs replaced, inexpensive and not to difficult) or the intake manifold gasket...more costly about $400. for a mechanic to do...you should see some anti-freeze build up around the intake bolts...this assumes that there is no water in your oil...which is far more costly as this indicates an internal cylinder head leak...Could be just a hose leak...a bad radiator cap...or thermostat housing leak, (maybe a cracked housing? Help me help you...do you see any anti-freeze build up anywhere? Hope this helps.
Without knowing what year or engine size is, I/m just guessing??????? But the 3.1L engines are FAMOUS for intake maniflod gaskets leaking. Look where the intake bolts to the heads. A freeze plug is in the block. Freeze plugs dont leak unless you have been running pure water or weak/cheap anti-freeze. They will rust out from behind and its BIG BUCKS to replace them all.
The corners of the intake manifold have coolant pasages. The lower intake manifold gasket will need to be replaced. There is an updated manifold gasket, manifold bolts, and torque specification. Call the chevrolet dealership and see if they will extend the warrant on this repair. It is a very common problem with this engine. Thanks Steve
Cracked head or head gasket will cause antifreeze to get in the combustion chamber and be ignited with the gasonline.
The white smoke when you first start lets you know of this condition. Each cylinder will need a compression check to test for leaks.
Pressure checking the cooling system does not provide you with enough information.
Its possible that your coolant is slowly being burned off in the cylinders possibly caused by a blown head gasket or cracked head,also i would definately check your oil and see if its overfull or milky looking,usually indicates a head gasket problem also.If your intake gaskets are leaking internally your engine could be sucking it in and burning it. With no leaks coming from the vehicle these are about the only things it could be!!
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