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engine miss/2003 merc/marquis Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine Troubleshooting daddy day care Novice Sep 11, 2012, 3:10 PM Post #1 of 4 (1446 views) engine miss/2003 merc/marquis Sign In 2003 Mercury Marquis, 4.6 v-8, 107 thousand miles. Vehicle all of a sudden developed a engine miss, no check engine light, the miss is at idle and all speeds, worse under acceleration and with A/C on. I'm not sure when the plugs were changed last. (This post was edited by daddy day care on Sep 12, 2012, 9:51 AM) Hammer Time Ultimate Carjunky / Moderator Sep 11, 2012, 3:28 PM Post #2 of 4 (1427 views) Re: engine miss/2003 merc/marquis Sign In You will have to wait for it to set a code to find out which cylinder it is. Plugs may help if they are over 80K but you likely have a weak coil and you'll need to know which one. Don't just change the plugs because that will only buy time and you will be going through this again soon. When you find out which cylinder, change that coil and all the plugs if they are due. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional. daddy day care Novice Sep 12, 2012, 9:43 AM Post #3 of 4 (1378 views) Re: engine miss/2003 merc/marquis Sign In Thanks for your help, you led me in the right direction. codes P0305, and P0316, but as i found out , its common for the 03 and up to have a leaky intake gasket, and since # 5 is right next to the thermostate housing , the # 5 hole was full up with anti freeze, now its intake time. Thanks again for your help Hammer Time Ultimate Carjunky / Moderator Sep 12, 2012, 10:26 AM Post #4 of 4 (1364 views) Re: engine miss/2003 merc/marquis Sign In Yep, all the way in the back left corner at the heater hose and the right front where the T-stat housing cracks. That part is aluminum on the new manifold. See it all the time. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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