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Old 05-03-2005, 05:20 PM
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94 Ford Crown Vic

Yep, another one of those "anti hot rod" posts, but I think I`ve answered and asked enough hot rod related questions to qualify.
Dealing with a 94 crown vic, stock 4.6 liter, sometimes at idle, the idle will raise about 500 and from under the hood they`ll be a loud "honking" noise, it sounds just like someone blowing through a pcv pipe, it does this about 5 seconds then stops, and the idle falls back to normal. Been trying to figure out what`s causing this for a long time, all vacuum lines have been replaced, EGR valve cleaned as well as the passages, check engine light never comes on, and it never gives any codes, it does this only when the cars in gear, and sometimes it`ll do it when going down the road, if anyone knows what this is let me know, as I`ve heard other model crown vics do the same thing, but this one didn`t start until it got after 90,000 miles. Any help most appreciated.
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Old 05-03-2005, 06:34 PM
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Not very familiar with Fords, but does it have some sort of idle stabilizer valve/circuit?
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Old 05-03-2005, 06:59 PM
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im printing this one too. a 94 vic....my farts could push the piston harder.
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Old 05-03-2005, 09:11 PM
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2 things on this car... 1st replace the throttle body gasket... I have replaced several of the intakes on these they split right behind the alternator... The new intake from Ford has this gasket and I have found a couple with it distorted to the point it appeared to be a vacume leak (on the old gasket)...? Also their is a hose on the back of the throttle body that splits and will "humm" you a tune which sounds like a fog horn in some ways...
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Old 05-04-2005, 04:48 PM
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I had a 96 Crown Vic police interceptor. The plastic intakes on those 4.6L's love to crack. Mine lasted to 180,000mi before it puked green from a crack in the water jacket right behind the alternator. What I would do if I were you is take the intake off (if you can) and look very close to make sure none of the intake runners are cracked. If you can't take the intake off, check all the plugs and see if there is a color difference. If you are lucky you may be able to tell if a cylinder is running lean from the leak.

Also, you may want to watch your fan. I know it sounds dumb, but the bearings in the thermal clutch were going bad in mine, and it would make a whistling sound when it kicked in.

a great forum to check is www.crownvic.net
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Old 05-04-2005, 08:35 PM
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Kinda an odd one. I am not familiar with fords either. Do you know anything about the torque converter control as far as if its control via electronic input or vacuum?

Just trying to think of things that change in a loaded vs. unloaded situation.
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