Question about Mercury Grand Marquis

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1989 Mercury Grand Marquis: I had done the lifter repair about one month ago, after which there were no problems starting the car. Check engine light was not coming on at that time. Only in the last two weeks has it gotten worse.

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Have you checked the battery voltage and had a tune up? I think it is an electrical problem. Check spark plug wires for damage and check plugs as well.

I've also seen this problem if the starter is sticking due to worn contactors, leaving it engaged when the car has already started.
Good Luck

Posted on Jul 21, 2010

  • sgtsnorkles Jul 21, 2010

    New plugs and wires. Starter is not sticking. Battery may be a problem. There are other issues as well. I have other posts about this vehicle.

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How to adjust rocker arm on a 1997 Mercury Grand Marquis


the bolt in the middle of it is not an adjustment its just torqued down tight .
the oil in the lifter is the auto adjustment . if its tapping then the issue is the lifter is bad or stuck. you have to remove the head to take it out . if you do . then do them all. if you cam is worn out it will have marks an rounded as will the lifter bottom.

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I have a 1989 Mercury Grand Marquis LS with a 5.0 V-8 FI Engine with aprox 174,000 miles. I drive this everyday, but about a month ago, it started to run funny. It feels like it's missing out. I have...


the only real way to confirm this is to have the fuel pressure checked out using a fuel pressure gage.it could also be a convertor plugging up in which case you can check the exhaust backpressure tested to see if it is.another way is to hit the convertor to see if you hear a rattle inside,if so the convertor material is breaking up and causing the exhaust to be plugged.some of the material could have travelled down the exhaust and is causing a problem.

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The new 10% gasohol will separate if it stands a few months. You may need to add fresh gas with a drying chemical like "Heet".

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