Misfire code p0303 ruff idle spuds like tapping of valves check engine light blinking

no engine stated.??????????
303 is gross misfire on #3 cylinder. on all cars.
its a for sure thing, means bad combustion on #3 and its power is weak. 1763 is tranny The 7 means that. and is problem2.

ever get a 60k miles tunup this decade?
sparks plugs, spark wires, filters, air and fuel>?
spark plugs dont last life of any engine.
THE CEL blinking (oper guide tells) means that misfire
is burning the CAT converter to a crisp. (raw fuel + air does that)
the opr. guide says get it serviced, fast, dont drive fast or tow anything. all great advice in the glove box.

get a cheap tuneup, and magic can happen in most cases.
misfire has many causes. over 20.
but a tuneup not done, is 99% cause. (due to nobody doing them)
only fate , determines truth, not statistics....
for example you sucked a valve on #3..

if the new spark parts dont fix #3 a compression tests is next.
or an injector balance test say from #3 to one other injector.
all this is like 1hr work, but no engine stated, so.....

Low compression does not require head removal. Do a compression test on a cylinder, then squirt some oil in the spark plug hole. Do the compression test on that cylinder again. If the compression goes up then the rings are worn. P0303 is a misfire in cylinder 3. This lets unburnt gas into the catalytic convertor. The cat can overheat, melt and be ruined. If the check engine light is blinking don't drive the car. A misfire is either no gas, no spark or low compression. The quivering light can be from idle or failing alternator. Put the probs of a multimeter on the battery posts. Set the meter to volts dc. Start the car the voltage should be between 13 and 14.6 volts. Anything more or less points to an alternator problem.

Check wiring harness around and including plug to the coil pack. Also check fuel pressure with vehicle running. I'm not sure of the specs but, Iit should be around 35 to 40 psi. at idle, and 50 to 75 at higher RPM's. I've seen Fords run with a bad fuel pump and demonstrate these exact symptoms

P0303 is a misfire on cylinder 3 - check the ignition and injector on that cylinder.
P0171 means engine is running lean (probably related to the above).
Start by checking the tune of the engine, verifying with a timing light that all cylinders have spark. Since these are coil over plug, swapping cylinder 2 with cylinder 3 should result in P0302 in addition to P0303 DTCs being set. If there's a problem with the VVT (Variable Valve Timing system) then there should be a DTC associated with that as well.

If you have spark, then it goes on towards a faulty injector. If both spark and fuel are present, it's possible that the VVT (Variable Valve Timing) system is freewheeling cylinder 3. Usually that implies the hydraulic lifter seals are faulty though there should be a noticeable valve tap at idle.

In any case, testing out ignition then fuel then ruling out VVT-related issues should resolve the problem completely. I have seen many of these have problems with the plumbing to the valve lifters getting clogged and that results in a dead cylinder.

a blinking check engine light usually indicates a misfire. It could be a bad plug, a bad coil, a bad wire, or a condition known as carbon tracking.

Pull the codes first. This will narrow down what cylinders are being affected. I'm betting you have one of these codes P0300, p0301, p0302, p0303, or p0304. The last number of the last four i listed are the specic cylinder that a misfire is on.

Let me know what you have for codes.

Let me know if you have any questions. Thank you for using FixYa.com!

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For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- OBD-II Trouble Code P0300? http://schematicsdiagram.blogspot.com/2011/12/obd-ii-trouble-code-p0300.html
---------Car misfires and error code P0306 and P0303 is shown? http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html
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Engine misses and truck jumps? Hard to down shift? Issue with high gear only? http://technoanswers.blogspot.in/2012/02/engine-miss-and-truck-jumps-hard-to.html

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Bad miss at idle?

http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Engine Misfire codes for car?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html
Engine Misfire codes?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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This will help.

Thanks.

p0303 is a mutible engine misfire on number 3 cylinder. the best fix,

A code P0303 may mean that one or more of the following has happened:

• Faulty spark plug or wire
• Faulty coil (pack)
• Faulty oxygen sensor(s)
• Faulty fuel injector
• Burned exhaust valve
• Faulty catalytic converter(s)
• Running out of fuel
• Poor compression
• but first of all check the wires and sparkplugs first!

My guess on this is gonna be a cracked ignition coil. Have it tested by someone. It is very common for these coils to crack and cause a misfire.

ok a P0303 Cylinder 3 Misfire Detected is a hard code meaning your problem is not intermetent,if you all ready changed the spark plugs and wires,the next step is to check the injector for the #3 cylinder,also if you can try using another ignition coil,check the crank position sensor and last try moving the plugs aroud to see if the code changes or if you get a new one,i dont think you will be stranded but the engine performance is crapy.

code means misfire on cylinder 3 check plug lead spark plug and if needed remove the tappet cover to check the valves