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02:59:40 - 12/29/2024
Dakota Performance
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Nick Person
Dodge Dakota
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5/18/2004
14:03:34
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 Subject: 93 v8 ......doggy
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Message:
I have a 93 318 auto 4x4. Its been very doggy on acceleraion and on the highway. Lots of downshifting when it accelerates. It was surging real bad and found it to be the o2 sensor. That fixed that. Also very low oil pressure and some abnormal consumption. It has been through several hand scan and diagnostic tests, only to find nothing wrong. About 2 years or longer ago i had some similar problems. Took it to a shop where i used to live and he troubleshooted it to be the intake manifold gasket. Fixed it and it was like a new truck. So my question is what is the best way to troubleshoot an intake manifold gasket. I remember he told me that the oil consumption is a clue. Then process of elimination is what he said. Someone told me to get a hand scan on it and spray around the intake and look for a spike in the RPMs? Or do i have another problem? Fuel pressure is right up there. Even thought it may be intermittant and monitored it going down the road.
Hope you guys can help me out.
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?
Dodge Dakota
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5/19/2004
15:30:19
| RE: 93 v8 ......doggy
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Message:
Chrysler now recommends a more sensitive test to see if the Magnum V8 intake manifold to block gaskets are leaking. If this gasket is leaking, it can cause the engine to ping.
The old test (I think it is described in the TSB's) was to take the PCV valve loose from the passenger side of the engine and oil vapor breather-to-air cleaner hose loose from the driver's side.
With the engine running at idle, use your two thumbs to seal the PCV valve hole on the passenger side and seal the hose going to the valve cover on the driver's side.
Wait a few seconds. If you feel a slight pressure building up due to blowby gases filling the engine block's interior - your engine is normal and your manifold to block gasket is probably ok.
If you feel a slight vacuum - your manifold-to-block gasket may be bad and one or more leaks is allowing the high vacuum in the manifold to suck the gases out of the interior of the block.
Many technicians now feel the above method only finds really bad leaks.
To find the lesser leaks they recommend putting two doses of 4-IN-1 Blacklight dye (Mopar part number 05010042AA /cost $8 per tiny bottle) in the engine oil and driving the truck for 200-300 miles.
They then take off the air cleaner and shine a blacklight down into the throttle body. If they see ultraviolet dye glowing on the bottom floor of the intake manifold - they take the manifold off and re-do the gasket.
I thought about that - it sounded good - but then I remembered that the PCV valve empties into the intake manifold - and the oil vapor breather empties into the air cleaner housing which is almost the same thing. I asked him, "Wouldn't some dye find its way into the manifold through the PCV and the breather even if there was not a leak?" He said, "We haven't found that to be a problem."
I bought two bottles of the blacklight dye - but I may temporarily disconnect my PCV and breather for the 200 mile test anyway - because for out-of-warranty work I would be the one to pay if they misdiagnosed a leak that wasn't there. Hank
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