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post #1 of 3 (permalink) Old 09-28-2006, 07:25 PM Thread Starter
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Angry problems after swap

Ok a little background. I swapped in a mark viii short block a 94 i think. Its got 97 grand marquis 2v heads, pi cams and comp springs. The car is a 94 and I upgraded to a 96 composite intake manifold. No aluminum crossover.

Now the problems. The water temp guage doesnt move. I think ive already got this one solved. The sensor uses the aluminum intake as the ground. The fan wont come on unless I unplug the other water temp sensor on the intake. Then it runs constantly. Is this the same deal, I need a ground? Then the oil pressure quage is at 0 too. But it is connected directly to the engine block so it has a ground. The engine was supposedly checked for oil pressure. and has 80k miles on it. How do I check for oil pressure? The engine isnt knocking or anything but you can hear the valvetrain working/tapping is this normal? Its not that loud. The car also runs like crap. Im guessing a tune is mandatory at this point. Can the oil pump be changed with the engine in the car?
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post #2 of 3 (permalink) Old 09-29-2006, 12:13 AM
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a tune is not necessary to run PI cams, so long as you kept the stock injectors and mass air......whats the compression of the cylinders? i ask because you could be off by a tooth (or more) on the chains......hopefully you aren't because that might mean PTV contact

you could also pull the valve covers off to make sure a cam follower didnt fall out of place

Last edited by guitar maestro; 09-29-2006 at 12:57 AM.
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post #3 of 3 (permalink) Old 09-29-2006, 07:38 AM
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I have heard of problems with not getting oil in a 4.6l after a rebuild since there is no way to prime the system. (I have no personal experience on this, only what I have read on the net).

Pulling the valve cover off would also let you know if you are getting oil to the top end of the engine.

With the DOHC short block and the SOHC heads, what does your compression work out to? I know going the other way (SOHC block and DOHC heads) lowers your compression by about one point. (IIRC, the compression heights are different and so are the combustion chamber sizes (SOHC vs. DOHC).

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