3.7L V6 S550 Tech 2015 - 2017 This section is for technical discussions pertaining specifically to the V6 variation of the 2015+ Ford Mustang.

Engine Misfires - HELP!

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Old Jan 27, 2019 | 03:41 PM
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Lazarus504's Avatar
Lazarus504
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From: CA
Default Engine Misfires - HELP!

I took my car to Ford after noticing a strange hissing in the engine. On the way to the dealer I noticed that my car would struggle at higheay speeds. After a few days they tell me that the engine is misfiring and that their is low compression in 3 of the cylinders. The cylinders are all on the same side, ones down about 5%, ones 8% and the other around 13%. I also noticed my coolant level drop about 3 weeks ago when I went to get an oil change, but no leaks/pools in my garage. Could coolant be leaking into my engine? I did the oil change maybe 2–3 weeks ago and my mechanic didn’t notice anything strange except the low coolant. He just added water because I told him I’ll be taking it into the dealership for its 60k mile service (i know I waited over 10k miles to do it, could that have caused issues?). Ford did a quick drivability test but couldn’t tear it apart until 2 weeks as they are super busy. Decided to take it to a mechanic my uncle trusts but wont check it till Monday. Just wanted to get some ideas on what could be wrong.
Old Jan 27, 2019 | 03:52 PM
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08'MustangDude
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DO a pressure test on the coolant system, you'll see the drop if there
is a bad head gasket. Idle the car, and see if there is any bubbling
in the coolant reservoir, if so, bad gasket.
Old Jan 28, 2019 | 04:08 PM
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Lazarus504
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Originally Posted by 08'MustangDude
DO a pressure test on the coolant system, you'll see the drop if there
is a bad head gasket. Idle the car, and see if there is any bubbling
in the coolant reservoir, if so, bad gasket.
I hven’t noticee any overheating or smoke though.
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