Question about Mercury Grand Marquis
Concerning engine miss. I have a 1999 Marquis. I have heard the problem goes back to cylinder head design. Once the injectors are worn, the burn in the cylinder becomes less efficient, causing the miss. Just by chance one weekend, I unloaded all the junk out of my trunk,(less weight, less load on engine). Also had tire pressure at old school levels (32 psi). Brought pressure up to the 44psi shown on tire and guess what, miss has left. Next fill up, I'm going to 89 octane for the slower burn.
Posted on Jun 18, 2009
Model: GRAND MARQUIS
Engine: V8 - 4.6L - FI - - GAS
Part Number: RS12YC
GAP : .054" (Original Equipment Manufacturer and/or Original Equipment Equivalent)
Hope this helps.
Posted on Oct 02, 2011
You will need to have a OBD2 scan completed to find out the fault and code that activated the check engine light.If you haven't a OBD@ scan tool you might want to stop at a garage and have it scared they might charge you for that the cost varies from $25.00 and up.
Posted on Dec 23, 2010
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Posted on Jan 02, 2017
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