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99 Mazda millenia - severe misfiring 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 Andrewmwilson90 New User Sep 18, 2017, 5:55 PM Post #1 of 3 (1448 views) 99 Mazda millenia - severe misfiring Sign In 99 Mazda millenia 210000 miles The car in question is having severe hesitation right after starting and after long drives and struggles to start sometimes. The error codes are showing A crankshaft sensor malfunction Fuel trim system malfunction Coolant system malfunction Misfire cylinder 1 Misfire cylinder 3 Misfire cylinder 5 Multiple misfire The car has over heated twice due to a leak in a hose which has been fixed. However has recently started losing coolant again with no obvious signs of a leak. In an attempt to fix the hesitation I performed a tune up. However it got worse and worse after I changed the sparkplugs and wires.I discovered Several of the boots had melted inside the sleeve from when the car over heated. This did not start until 3 days after, upon checking it I discovered the front 3 plugs had worked themselves loose. At which point I pushed the back in and double checked every other wire connection. This helped some of the hestitation, a week later the misfiring grows increasingly worse and the check engine light comes on. Showing the previous stated codes. The wires were once again checked but all were still properly connected. I am worried the overheating has caused significant electrical damage. But I want other opinions on other possible causes. (This post was edited by Andrewmwilson90 on Sep 18, 2017, 6:02 PM) Tom Greenleaf Ultimate Carjunky / Moderator Sep 19, 2017, 1:45 AM Post #2 of 3 (1378 views) Re: 99 Mazda millenia - severe misfiring Sign In Presumably Andrew? Careful with the parts "cannon" on a car that overheated possible up to in flames with 210,000 miles. Never mind codes. Strong bet this engine has totally had it and would be checking it for compression while it still turns/cranks at all. "melted plug wire boots" OMG - that's way beyond overheating, no coolant or oils can sustain that temp and questionable if alloys everywhere could take that either. See if this is beyond a fix, compression first, T Discretesignals Ultimate Carjunky / Moderator Sep 19, 2017, 5:10 AM Post #3 of 3 (1369 views) Re: 99 Mazda millenia - severe misfiring Sign In I agree with Tom. A compression check and possible leak down test is in order. Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.   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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