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Iv got an 04 mustang it stated running ruff and the cel (check engine light) came on and started to flash it read that misfire on cylinder 1 did plugs and wires and car is still running ruff like it

Seems to be at a certain rpm not when i generally accelerate

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Burnt or stuck valve

Posted on Feb 11, 2012

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1 Answer

Once my 98 malibu warms up fully check engine light flashes why is this


A flashing check engine light indicates an engine misfire, Do a fault code test to read the code and finds the culprit cylinder.

Sep 05, 2016 | 1998 Chevrolet Malibu

1 Answer

What causes CEL to flash for 1/2 mile and then go off and then not start at all after rain but start when dry?


The check engine light flashes when there is a catalytic convert damaging advent happening , like for a sever misfire . When a vehicle has a misfire problem no combustion happens in that cylinder dumping raw fuel into the catalytic convert , were it burns causing the substrate to melt . To buy a new converter could cost up to a $1,000.00 bucks ! You don't say what make ,model an year vehicle you have , so I can't say what could be wrong ! Plug wires , coil's , distributor cap if yours has one . If you have it check for DTC'S - diagnostic trouble codes , You probably have a P0300 random misfire or a P0301 - to P0308 depending on the number of cylinders Check Engine Light On

Sep 18, 2015 | Cars & Trucks

3 Answers

It just started to sputter and check engine light flickers off and on. What's wrong?


Flashing CEL means the ecu is picking up a misfire count over 50% misfire that high can cause a rich enough mixture to damage the cat if you can get a scan tool that will show data list you can see which cylinder is misfiring and have an idea of where to start looking for you problem

Mar 12, 2015 | 2000 Toyota Tundra

1 Answer

Flashing check engine light


A flashing CEL means one or more of the cylinders is misfiring enough to damage your cat convertor. Or could be the PCM trying to warn you of the impending misfire issue along with which cylinder(s) the problem is at.

Mar 07, 2014 | 1999 Ford Explorer

1 Answer

I have got misfire,there are vaccum leak


leaks.! why not fix that, first thing???????
no engine option stated.
but if the engine is MAF based, it will go lean (air/fuel mix) with ANY un-metered air leaks. (illegal)

that flash CEL means you will burn the CAT up ,if you keep driving
the operator guide tells you that, read it.

when all cars glow the CEL the mech, uses a scan tool
to scan PCM to see all the errors
im sure you have P0300 (misfire DTC errors) USA cars.
but there may be others, why not scan it and look????????????

running lean and flogging the engine can burn valves too.

1: check fuses
2: scan it,
3: report.
or its 2 days hard work , doing it the hard way.

Feb 19, 2014 | 2005 Honda Odyssey

1 Answer

My 2002 mustang gt misfires on cylinder 1 ( cylinder 1 misfire/circuit malfunction) While misfire i get lots of fuel dumping. Loss of power.


I assume your CEL light is flashing. You will ruin your $1000 catalytic converts if you drive it this way. Your cats will turn red hot and self destruct.

You have a bad COP, Coil on Plug (if your vehcile has that system, and it could have damaged your PCM engine computer. Remote chance it's just a plug.

Your injectoris still pumping fuel into that cylinder and teh cat has to over work to treat the unburned fuel.

You did not say if you have a V8 or V6 engine which is important.

Jun 24, 2011 | Ford Mustang Cars & Trucks

1 Answer

2004 F150 SuperCrew, check engine light flashes, engine runs roughly and shudders. Engine light stays on and the engine goes back to running smoothly.


Flashing CEL is an indication of a misfire. You would need a code scanner to find out which cylinder it is.
The code should be a P030n where n= 1 to 8 ( the cylinder number ). Could be a P0300, which is a misfire indication.

Jan 26, 2011 | 2004 Ford F150

2 Answers

2001 audi a4 1.8 random misfire


do a compression test then do a combustion pressure test if all good computer is questionable

May 25, 2009 | 2001 Audi A4

3 Answers

Engine light flashing


It sounds like you have a misfire. Anytime a misfire is detected by the powertrain control module (PCM) it flashes the check engine light (CEL) on and off. Do not drive it this way because it won't take long to damage the catalytic converter. Have the diagnostic trouble code (DTC) read with a scan tool or "code reader" to see what DTC or DTCs are set. If it's a 4 cylinder, it will have a P0301 set for a cylinder # 1 misfire, a P0302 for a cyl # 2 misfire & so on. If the misfire is random (ocurring in multiple cylinders intermittently) it will have a P0300 set. Once you know which cylinder is misfiring you can check that cyl to see what the cause might be. It could be an ignition coil or spark plug failure. The # 1 cyl is always the one closest to the front of the eng or this car, the one closest to the passenger side fender.

Dec 16, 2008 | 2005 Chevrolet Cobalt

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