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07-04-2019, 10:10 AM | #1 |
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Dead miss in the engine
2004 E85 3.0 with sport package 69k miles. I noticed recently when I am at a stoplight I have a dead miss in the engine, about once every 20 to 30 seconds. It seems like it runs fine under acceleration or anytime off idle. I don't know a whole lot about the motors, I have only had the car 2 months. Any suggestions where to start looking for the problem?
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07-04-2019, 02:24 PM | #3 |
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By dead miss, is it an awkward idle...anytime I've had a misfire svc light came on immediately
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07-04-2019, 04:29 PM | #4 |
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Only light I have on is ABS. It idles perfectly until a hesitation that you can feel through the car and hear. RPM's drop just for a moment. It last as long as a backfire. Sorry, don't know how to explain it other than misfire.
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07-04-2019, 06:52 PM | #5 |
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Is the AC on?
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07-05-2019, 11:09 AM | #6 |
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I checked that this morning. I was sitting at the light and it started missing even more so I turned off the AC and it didn't seem to change anything. I personally think it may be a bad coil or wires.
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07-05-2019, 01:00 PM | #9 |
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I would say check the disa valves inside the manifold...one of the flaps could've broken off and it's creating a blockage in one of the ports...seems low mileage for disa failure however it is an 04. My check engine light would come on showing misfire in 3 &6 intermittently...light would come and go because without air the broken flaps would kinda rest and then on accel would kick up and create blockage...only thing that comes to mind
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07-05-2019, 01:50 PM | #10 |
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I had some misfires with bad rear o2’s but the CEL didn’t come on initially as it was still too “early” for complete failure of the sensors.
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07-05-2019, 11:12 PM | #11 |
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What WickedNy said.
Bad coil or wires will usually give you worse misfire under acceleration.
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