Having intermittent misfires, but no check engine light. Mileage performance is down about 10% but everything else is fine. In fact, car passed annual emissions test. My mechanic said if it passed emissions test, an engine analysis wouldn’t explain the misfiring. (Had Throttle Body and spark plugs r…

[image] Haynes: My mechanic said if it passed emissions test, an engine analysis wouldn’t explain the misfiring Your mechanic is wrong, and it sounds like he’s jumping to conclusions I’m a professional mechanic, who does smog inspections in California, arguably the most stringent state, as f…

[image] Haynes: intermittent misfires, but no check engine light. That’s a pretty unusual report here. The engine computer is usually pretty good at noticing misfires. It may be you have a misfire code pending, so good idea to check for that. Sometimes the CEL wont turn on until misfires …

[image] George_San_Jose1: That’s a pretty unusual report here. No, it isn’t I can think of countless instances where the engine was misfiring, and it was noticeable to the driver, but not enough to generate a code or a check engine light

OP can type “misfire” into the forum search feature and check what other posters have said. Click that thing that looks like a magnifying glass, upper right.

There is no pattern to the misfires. They’ve happened at idle, under load, when the engine is heat soaked or at start-up, in damp or dry weather. They started happening when 95° plus weather became routine this summer. The misses are very noticeable (my wife can also pick them up). Ford literature I…

For a cylinder to “fire” correctly it has to have these things spark, robust, and at the right time fuel and air pulled into the cylinder, at the right amounts & % mixture compressed properly & all exhaust gasses pushed out the exhaust pipe So if you have misfires happening, one or more of tho…

I have the same issue. 180,000 miles. 2007 F500 SEL. I thought it was the transmission at first then I hooked up a scanner. Cylinder 2 misfires intermittently. No CEL. Pulling the intake manifold this weekend and changing plugs, been 80,000 miles since changed last, rubber ring in egr that tends…

As I understand it, at least for the F500 V6, a cylinder has to do a certain number of misfires within a certain time frame to trigger a CEL. In my case, cylinder 1 was intermittently misfiring without triggering a CEL, and it’s coil was the cause. Last month I got a “Cylinder 2 misfire” CEL, and a…

Thanks for sharing the solution to your issue. I’m more confident that the COP is the solution. I agree, I took off the upper intake at 90,000 and it was a challenge. I had to unbolt the egr from the intake instead of the egr exhaust pipe. I think it took about an hour.

2006 Ford Five Hundred intermittent misfires without CEL

Maintenance/Repairs

Tester September 18, 2018, 12:51am 3

Is there a certain speed at which this misfire occurs?

Tester

Topic		Replies	Views
Ghost in the Machine Misfire Maintenance/Repairs	8	1452	April 23, 2008
Cylinder 4 misfire Maintenance/Repairs ford , fusion	4	1327	October 23, 2016
Misfiring Maintenance/Repairs lexus , lx470	4	988	July 9, 2015
Ford V10 Missing Maintenance/Repairs gasoline , filters , selling	7	7928	October 26, 2008
Missfire cly#1 Masda B2300 Maintenance/Repairs	13	1996	February 27, 2009

2006 Ford Five Hundred intermittent misfires without CEL

Related topics