Yet Another 2.9 Problem ! ! !
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Junior User
Joined: Mar 2004
Posts: 53
Likes: 0
From: Cincinnati , OH
Yet Another 2.9 Problem ! ! !
Ok get this.... I installed a new 2.9l in my truck. from an 88 to a 91 with the 91 ECU( if it even matters ) and after replacing TUNS of parts; plugs / wires / cap / button / ignition coil / fuel pressure regulator and setting the timing.... it runs like crap !!!!
in fact, nothing I have done so far has changed anything. Today I started pulling wires with it running. the no. 3 and 6 cylanders arent doing anything. they get plenty of spark and fuel and have tuns of compression (like 165 - 175 psi) so.... I looked at the no.6 plug and it has antifreez on it.
OMG I am thinking head gaskit!. but.... plenty of compression and no belching into the radiator. so I am thinking intake gaskit right??
However.... I sprayed carb cleaner all around the intake and no change in idle.... any thoughts on what I should do next??
first lets get the first thing that comes to mind.... the firing order 1-4-2-5-3-6 and yet they are in the correct order...
Any thoughts ? ? ? ? ??????
in fact, nothing I have done so far has changed anything. Today I started pulling wires with it running. the no. 3 and 6 cylanders arent doing anything. they get plenty of spark and fuel and have tuns of compression (like 165 - 175 psi) so.... I looked at the no.6 plug and it has antifreez on it.
OMG I am thinking head gaskit!. but.... plenty of compression and no belching into the radiator. so I am thinking intake gaskit right??
However.... I sprayed carb cleaner all around the intake and no change in idle.... any thoughts on what I should do next??
first lets get the first thing that comes to mind.... the firing order 1-4-2-5-3-6 and yet they are in the correct order...
Any thoughts ? ? ? ? ??????
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
If you have coolant in the combustion camber I would pressure test the cooling system and check the oil for coolant. If you have coolant in the oil don't run it or you'll need to rebuild the bottom end. You might find the crack if you pull the valve cover and pressurize the cooling system.
Cargo Master
Joined: Oct 2003
Posts: 2,833
Likes: 4
From: Jefferson, Iowa
Could still be leaking at the intake gasket. Do a leak down test in the cooling system. Change your oil, put some water about 1/3 up the jar and fill the rest with oil. The oil will go to the top, and if the water turns green, you have a bad block, headgasket, or if it anything like the PSD injectors, bad seals on those.
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bondob
1987 - 1996 F150 & Larger F-Series Trucks
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Nov 20, 2009 08:24 AM
