Yet Another 2.9 Problem ! ! !
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Junior User
Joined: Mar 2004
Posts: 53
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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 ? ? ? ? ??????
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
2 thoughts:
1) Does an intake manifold gasket leak have to be evident from the outside? Could it only be leaking through an internal seal (between a coolant passage and an intake passage), but the outside edge of the gasket be sealing fine?
2) Are the 3 & 6 injectors "firing" or are they stuck open continuously feeding fuel into the cylinders?
1) Does an intake manifold gasket leak have to be evident from the outside? Could it only be leaking through an internal seal (between a coolant passage and an intake passage), but the outside edge of the gasket be sealing fine?
2) Are the 3 & 6 injectors "firing" or are they stuck open continuously feeding fuel into the cylinders?
Postmaster
Joined: Dec 2001
Posts: 3,742
Likes: 2
From: UT
You might try a fuel pressure test before going to the trouble of pulling the ionjectors out. Hook up a fuel pressure gauge and pressurize the rail with the fuel pump. If the fuel rail doesn't hold pressure when the pump(s) shut(s) off, then one or more injectors might be stuck open amongst other possible causes of the pressure bleeding off).
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bondob
1987 - 1996 F150 & Larger F-Series Trucks
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Nov 20, 2009 08:24 AM
