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Old 02-03-2016, 12:09 PM   #11
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Yes I had the cruise on. And that's exactly what mine is doing.

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Old 02-03-2016, 12:11 PM   #12
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Flashing check engine light indicates a condition which is harming the catalytic converter. Usually overly rich condition from bad 02 sensor or misfiring plug. If engine is running smooth then its bad 02 signal. Dealership will scan for stored codes.

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Old 02-03-2016, 12:13 PM   #13
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Just remembered. Bad vacuum leak can cause overly rich condition because it tricks 02 sensor. But that would cause high idle.
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Old 02-03-2016, 01:46 PM   #14
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Under any load a motorhome creates you would feel any kind of misfire very easily.. I would say a batch of bad gas or bad o2 sensor..
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Old 02-03-2016, 02:05 PM   #15
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From CarMD

In today’s Fault Code Spotlight I will explain one of the most common and severe fault codes in your vehicle – misfire. Misfire is a very serious problem and one you should never ignore. The fault codes that you will see for misfire are:

P0300- Random/Multiple Cylinder Misfire Detected

P03nn – Cylinder nn Misfire Detected where nn is a 2 digit number (01, 02…11, 12) indicating the cylinder in your vehicle 1-12.

P0313 – Misfire detected due to low fuel level

P0314 - Misfire detected single Cylinder not determined

P0315 -Misfire Detected due to crankshaft position sensor

P0316 – Misfire detected during engine startup

The most common method for detecting misfire is called crank pulse fluctuation. At an engine speed of 7,000 rpm, your vehicle’s computer is processing 2,800 crank pulses every second! The onboard computer works with the crank pulse sensor to look for fluctuations in the signal to determine if your engine is misfiring. It then triggers the check engine light if it sees a problem.

There are two types of check engine light warnings that all drivers need to be aware of. The first – and more severe is a Type A misfire, which is represented by a flashing check engine light. This flashing check engine light means you are doing “mechanical damage” (read in a deep ominous voice designed to imply very large repair bills by continued neglect) to your vehicle if you continue to drive under these conditions. If you see a flashing check engine light you should seek immediate professional advice.By mechanical damage we are talking about things like the catalytic converter, the exhaust manifold, pistons, rings, valves – virtually all upwards of four-digit repair bills.
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Old 02-03-2016, 02:22 PM   #16
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Originally Posted by georgew48 View Post
Coming home yesterday I started getting an intermittent blinking check engine light. It would only blink a couple of times and only when going down hill with my foot off the gas. As soon as I pushed the gas pedal back down it would go off. The engine is running fine and no loss of power. My scan tool identified it as a code p300 which Is random misfire. Like I said no rough running and no fluxiuation in the rpm and no loss of power. MPG average was just over 7 mpg. Called the ford dealer this morning and they are going to look at it. Hopefully nothing serious.
When your CEL blinks, meaning in a defined pattern, not clear then return, it means it is reading the next level up of code(s) which in turn tell the CEL to blink, is more severe than a constant ON. Do this first before you head off to the stealer, because you seem to describe constant ON, then self clearing. I'll assume you're out of warranty, if not let them fix it .Clear the code, drive it, and if the CEL returns, re-scan it to pull the code.
Random misfire might indicate one of the coil packs is failing. Whats confusing is usually a coil pack fails outright. The other thing might be a fuel injector issue (i.e. clog, failure starting). When your CEL clears by itself, the intermittent problem occuring has stopped, causing the main ECM to reset the CEL to OFF, after the sequence meets design specs.
This information you learn will help you when dealing with your stealer,is trying empty your wallet.
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Old 02-03-2016, 02:28 PM   #17
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I was always told a flashing CEL is a bad situation where you should stop driving or risk damage. I believe it was misfiring that made it bad..??? MAYBE?

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Old 02-03-2016, 02:43 PM   #18
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Originally Posted by TURBS View Post
Random misfire is likely a coil or plug.
Just worked on one yesterday.
Plug would intermittently misfire at 45 - 50 mph no miss before or after

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I tend to agree. I had the same issue,but on a different vehicle. I drove it a few miles and the light went out. Did a code check and got the same result. No problem since. Random is the key word here.
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Old 02-03-2016, 02:56 PM   #19
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Oops, should have read the string. Let Ford fix it. I would however, talk with the tech directly to get his honest experience on what he sees with units like yours after the fix. That knowledge my friend, will save you bundles when it's on your dime.
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Old 02-03-2016, 03:02 PM   #20
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Flashing CEL is for emissions related issues. For the OP-his light stops flashing which means temporary issue. He already has appt with dealer and sounds like he is well within warranty. What will suck is that unless they can repeat the conditions, they will say no problem found. Driving downhill with cruise on- that's a hard condition to duplicate. Going uphill and high RPM's- much easier.

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