1998 GMC Sierra Logo
Posted on Jul 18, 2010
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Had intake manifold leaking water. went all the way to the heads and replaced all the gaskets. all good right? now it wont start, have adjusted valve more than 4 times. I'm not 180 out and coil has spark, plug wires have spark and no fire??????

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Ronny Bennett Sr.

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  • GMC Master 6,988 Answers
  • Posted on Jul 18, 2010
Ronny Bennett Sr.
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You have spark,and no fire?If the spark plugs are firing,then how do you have no spark?Just trying to figure out what you are saying,Are you just saying the engine will not fire off and run?Is there injector pulse?Will it try and run is starting fluid is sprayed into the intake?Make sure all wire connections are making contact,and all ground wires are attached to the engine.

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  • Master 4,044 Answers
  • Posted on Jul 18, 2010
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You may not be 180 out but could be 30 degrees out of time which will cause the same condition. This usually happens when your valves are not set to TDC on the #1 Compression stroke but for the Number 2 or 3 and the Pistons are at #1 TDC. Your getting fire to the cylinder but there is nothing to ignite when it reaches the plug. Make sure both valves are closed on the #1 cylinder and that the #1 is Top Dead Center on the compression stroke then verify the Timing marks are lined up for the timing chain/belt. This should resolve your problem.

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Yes it is possible it could just be the intake manifold and you would have to remove the intake manifold to get to the heads so either way you need to pull the intake off when you do then you will know if it is the intake manifold gaskets by inspecting the gaskets if they are bad then you will not need to pull the heads but if they look ok by visually inspecting them then you will need to go further and pull the heads so not pulling the intake manifold is not an option it has to come off anyway.
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If you plugged the original leak (which sounds like the head gasket) and then the radiator was leaking, and you are having water coming out of the exhaust, then you need to replace the head gaskets. It sounds like you had a blown head gasket from the start. Here's what to do.

1. Replace the head gaskets (will need intake manifold gasket as it need to come off for this procedure).

2. Replace thermostat, radiator cap (if radiator is still good)

3. Replace water pump; the water pump may have stopped working (mechanical), which in turn caused the pressure to build an blow the head gasket (the cause of the pump would be a bad thermostat. If the truck was overheating, then the thermostat was bad to begin with, then the pump, then the head gasket, so then the only place left for the water to go is out the exhaust.

Here is a list of replacements:

^ water pump
^ thermostat
^ head gaskets
^ valve cover gaskets
^ radiator cap (if radiator is good)
^ radiator : if leak from cap caused any damage to radiator (should still be good)

**Also check the radiator hoses to ensure they do not have any "bubbles". Hot water over time (with anti-freeze) erodes the inside of the hoses, and begins to "dig" holes and grooves in the hose, which evetually cause leaks. Consider replacing these as well for safe measure.

Please, let me know if you need further assistance.

carsandcomps,

Guru, Premium Expert @ Fixya.com
1helpful
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Water in oil

possible intake manifold gasket leaking into engine
2helpful
1answer

Hello, i have a coolant leak i thought it was the water pump but the leak is above the mount bolt of the water pump beside the valve cover no coolant has gone in the valve interior, could it be a cracked...

A crack in that area of the block, while possible, is highly unlikely. A crack in the block usually happens in between the cylinder walls on the side of the block. It is most likely leaking from the intake manifold gasket that connects the intake manifold to the heads, or if the upper radiator hose connects to the intake manifold, it could be leaking from the thermostat housing or hose. There are also coolant temperature sensors that are mounted in that area. Or last but not least, it could be leaking from one of the freeze plugs in the end of the head. Coolant runs through the block, heads and intake manifold.
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