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post #1 of 4 (permalink) Old 12-06-10, 08:37 AM Thread Starter
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1985 Grand Marquis help

I inherited a '85 GM from my grandmother a few years ago. 5.0 V8 TBI. Recently it died on me and I am racking my brain as to why. It didnt' just quit, it sort of died like a cylinder at a time. Started skipping, got worse and worse until it died.
I can get it to run for a couple of minutes before dying back out again. The engine light will come on and then start skipping until it shuts off.
What i've found so far:
- Fuel pump seems OK, replaced a couple of years ago.
- Fuel pressure seems OK after testing with pressure gauge.
- Code pulled from the ECU, is "running too rich". I tested this with a voltmeter and counting the needle sweeps till i got the codes out.
-Distributor cap/button/Spark Plugs OK, replaced recently. Plenty of fire on all cylinders.
- Cat Converters do not appear to be stopped up.
-There is a break in the muffler pipe "tee" between the cat's and the muffler which i will fix if i get it running again.
Would the muffler leak cause the engine to not run?
I'm out of ideas if anyone has and suggestions, tips, e[/U]tc..
thanks,

M

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post #2 of 4 (permalink) Old 12-06-10, 09:02 AM
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Re: 1985 Grand Marquis help

Have you pulled any spark plugs to see what they look like? Black from gas, etc.? It may be the fuel pressure regulator. Have you run it with the pressure gauge connected? If it's been running rich, it could have plugged the cats. The exhaust leak won't cause the running problem.

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post #3 of 4 (permalink) Old 12-06-10, 10:21 AM
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Re: 1985 Grand Marquis help

If I recall, those engines had a problem with crankshaft thrust washers, and in turn the crank sensor. Check the crankshaft for too much endplay, or damage to crank sensor.
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post #4 of 4 (permalink) Old 12-06-10, 10:42 AM Thread Starter
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Re: 1985 Grand Marquis help

Bert,

Yes I've pulled the plugs, several times, actually changed them all once. They were usually kinda wet (gas) but were not black. The cats are ok. Fuel regulator has not been checked.

RSBob, That will be something to check into as well. I have a shop manual at home and will look for some specs.

The battery is now shot in the car as well, so can't do much until that's replaced.

thanks for your help,

M
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