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Can bad injector cause mifire - 2001 BMW X5 3.0

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Yes it very well can

Posted on Dec 31, 2012

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The coads po303 p0306 help


did you reset the codes first after new parts>???????????
misfire #3 and 6( repeats)
that is because misfire has 3 causes.
those codes really mean , Low combustion energy.!!!
and that is:
1: spark bad, ?
2: fueling wrong to those 2. (injectors or vacuum leaks)
3: compression weak on those 2.?

see?
the ECU measures the velocity of the crank shaft, (not speed) rate of velocity, and those codes, mean its slow.
too slow means its. weak combustion.
only
new plugs and coil. so....
i do compression first. just hate chasing my tail.
then check for no vacuum leaks near #3 and 6 (injector base gaskets)
then do a injector balance test with my pressure gauge.

the injectors can be clogged, , partial clogged or leak fuel.
they can leak air at the base.
i check plenum vacuum too for 19" Hg vacuum steady never bouncing. if it bounces head valves, bad, or ?

Mar 11, 2015 | 2003 Jeep Grand Cherokee

1 Answer

Fuel system control open at 4000 rpm


p0306?
misfire means, low combustion energy on #6
  1. bad spark,
  2. bad injection,
  3. bad compression
there are tests for each one.

i always check compression first. that why i dont spend a fortune
guessing. 30min.,labor , done wide open throttle, 150psi min.

i also heck the fuel pressure doing the SOP leak down test. (fSm)
then the injector balance test at same time.
finds leaking injector and clogged.
got cops?
you could have swapped coil packs COPs to see if that cured mifire.
swap any other with #6
if problem follows the coil pack COPS, then its bad.
my v6 had a 3 coil pack and cant swap just one coil. all 3 or none.

the misfire is real. you can feel it and the PCM measures it.

Apr 06, 2014 | 2005 Jeep Grand Cherokee

1 Answer

Is it easy to replace a coil? my engine mifires on cylyder 6..


it may not be a coil just fyi i spent plent of time tooling with mine which had a misfire on cylinder 5 and found out it was an injector and its not too easy and not too difficult (in my eyes) to replace a coil but u have to take the intake off first to get to the back three cylinders

Nov 25, 2011 | 2004 Ford Escape

2 Answers

Mifire on 1 and number 2 cylinder on my dakota 4.7 litre


When this happens you have a bad coil pack on the impacted cylinder. This is a fairly common occurrence on the Chrysler 4.7, and the fix is simple. Replace the coil packs for the impacted cylinders. Most will replace all 8 of the coil packs to avoid having to do this again, but you will be fine replacing only the ones that are implacted. You can save a few dollars and get some from an auto salvage yard, the chances of you getting a bad one are slim-to-none.

Mar 15, 2011 | 2001 Dodge Dakota

1 Answer

Trouble code for bmw 760 code # 274E


you could have bad wires, bad plugs, or bad ignition control module

Jul 31, 2010 | 2007 BMW 760Li Sedan

1 Answer

Mifire code on cylinder 5 have changed plugs and still comes up


either a coil ,wire, fuel injector. if you have wires check for white spots for arcing out on ground.

Jun 22, 2010 | Cars & Trucks

1 Answer

My windstar is mifiring on cylinder 5 could it be coil pack or fuel injector?


try swopping an injector from another cylinder ,if its still the same then coil ,but it could also be the valves burnt out or a chip out of the stellite coating on the valve seat

Apr 30, 2010 | 2001 Ford Windstar

2 Answers

Clinder 3 misfiring


well you will have to remove the whole fuel rail at the same time there should only be two or four bolts that holds it in place remove all bolts and gentally use pry bar to pop injectors up out of holes

Aug 18, 2009 | 2001 Volkswagen Passat

1 Answer

2002 jeep grand cherokee laredo engine light on and car skips a bit now and then. Could this be something with the transmission?


check to see what the codes are in the computer. if it is a 300 to 306 or 308 depending on the engine size.these are mifire codes whitch would cause one to cut out off and on and turn on the light.
then you can see if it is plugs,wires,injectors, ect....

Jun 16, 2009 | 2002 Jeep Grand Cherokee

1 Answer

2002 ls v6 cyl 3 5 6 mifire help


the missfire can be caused faulty leads and spark plugs replace spark plugs and leads reset codes by removing engine fuse for 10 sec road test and check codes if the lean on bank 2 comes back you may have a faulty injector or intake manifold leak try some injector cleaner in the fuel overdose it it wont hurt

Dec 30, 2008 | 2002 Lincoln LS

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