Question about 2001 BMW X5 3.0

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I have a BMW x5 3.0; 2 different diagnosis: 1) bad coils and spark plugs, 2) #6 cynlinder misfire-compression and plugs good; intermittent loss of signal to #6 fuel injector. Faulty PCM. See dealer for computer and reprogramming. Help? Anybody seen this type of problem?

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  • Tai Hart
    Tai Hart Dec 04, 2012

    Help! It's becoming undrivable.

  • Tai Hart
    Tai Hart Dec 04, 2012

    I replaced all 6 spark plugs today. it ran pretty smooth, slight rough idle when stopped. I drove it about 7 miles. I went in the store; came out; drastic rough idle again. Drove home, barely. It barely accelerated, ran rough.



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Posted on Jan 02, 2017

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SOURCE: BMW 320i year2002 e46

I don't think your trouble is on the ignition side of it but I am sure that you must have a look at the idle speed control(stepper motor).
If with temperatuer your "misfire"changes to better, it means that it's probably running too lean at cold, normally the stepper motor or ISC does this job.
Let us know how you get on.

Posted on Oct 31, 2008

  • 137 Answers

SOURCE: Misfires in 1,3,4,5 and 6, but I changed the coils. HELP.

seems obvious but gotta ask, have you looked at plugs and replaced wires?

Posted on May 26, 2009

  • 850 Answers

SOURCE: bmw 320i m50, after water leak started to misfire,

swap a lead to see if it waps the missfire if it does then its the lead!
If not then the spark plug may be fouled

Posted on Jul 26, 2009

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Hi i have a miss fire on cylinder 1 on my BMW X3 3.0i 2004

Try the spark plug , ht lead or a compression test

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Try changing the spark plug/ignition coil to a different cylinder and see what happens. Compression test would be a good idea. A common problem is the boot at the throttle body cracking but vacuum leaks can be hard to find, sometimes it's a good idea to someone else take a look.

Jan 18, 2016 | BMW 525i Cars & Trucks

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P0303 cylinder 3 misfire

which engine? ; again, and WHAT ENGINE ???????
your fixing and engine and don't know what's there? really?
303 means misfire.
but more accurately it means weak combustion
and can be cause by 3 things. or more.
1: bad spark , be it the plug or wires, or coil
2: low compression, lots of ways. 10 or more, ask.
3: bad air fuel ratio to that cylinder 3, air leaks?

the ECU discovers this with the spark monitor
this monitor (runs all the time) it sees, the crank shaft
not accelerate fast enough, (weak power stroke on #3)
that is all you need to know on P030x codes.

if spark is prefect
and AFR good.
then it must be compression, right?
even water leaks to the combustion chamber can do this.
it is misfiring, that you can bank on.
no engine posted, why do that?

all we know here, is a body. a 05 GC.
5.7L ?????

ill quote the fsm
for you.
i toss coin, lands on 3.7

the FSM listed items for 303, some are IFFY (comments)

  • VISUAL INSPECTION (of spark and injector parts)
  • (F142), (K334) ASD RELAY OUPUT CIRCUIT (i disagree)
  • CHECKING FUEL PRESSURE (why only 1 cylinder?)
  • FUEL PUMP MODULE (ditto)
  • CHECKING FUEL LEAK DOWN (injectors leaks)
  • FUEL INJECTOR (injectors sticks)
  • INJECTOR CONTROL CIRCUIT (shorts or opens in the line)
  • PCM (last , if ever. i bet not it)

Basics is better.
3: BAD COMPRESSION, or even water leaks or cam lobe damage
or valves in head bad. ,

does your engine use COPS? coil over plugs????
why not say what engine.

did you replace the spark plugs and use the correct type
and gap them per the hood EPA sticker (look up)
and if it has COPS, did you at lease make sure the COP boot
on #3 is brand new? if not why not?
using the old boots on #3 is wrong, idea. they all fail. soon.
the 3.7 has COPS
put new boot on it. (buy them, if possible. (i carry spares at all times)
then look in the wells. are the wells full of oil or water. BINGO.
did you even look there?

the one hard part of misfire is , is the AFR, air fuel mix ok on #3
and compression, W.O.T. the tool is like $20 and 15min work.

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Loss of power ,misfire, and strong smell of gas in 99 yukon 5.7

You'll need to pull the code from the computer to find what cylinder it is. It could be simple as replacing the spark plug (check it for damage) or the ignition coil. If the spark plug doesn't fix it, try moving the ignition coil to a different cylinder to see if the misfire follows that coil. If it does, replace the coil. If it does not, do a compression test as you may have dropped a valve or lost compression rings in that cylinder. Since there is raw fuel dumping into the exhaust there is the risk of fire from the catalytic converter.

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My engine light came on. I went to Autozone to get a reading. It read PO301 3rd cynlinder misfire. So I put new plugs and wires. The engine light never went off. I re check the plugs and wires. But I kept...

Low compression can be caused by different things. And NO YOU DON'T need a new engine yet. You need to take the car to a repair shop that you trust and have them do more tests. A bad Valve will cause low compression and thats a lot cheaper than a whole new engine. A bad head gasket can cause low compression and that's cheaper than a new engine. You need to have the repair shop do what's called a "leak down" test. This is where the cylinders are pressurized one at a time and if they are losing pressure, the mechanic can pretty much tell you the problem. For example if air is coming out the exhaust, then the exhaust valve has failed, and if air is coming out of the intake, the the intake valve has failed. If it bubbles out of the radiator then the head gasket has most likely failed. Take it in and let me know..

Jan 15, 2011 | 2006 Dodge Stratus

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What causes a misfire on a 99 pontiac grand am if spark plugs or good and the car does not have wires

here are the common causes of a missfire, defective ignition coil or ignition coil wiring for that cylinder, defective fuel injector, defective powertrain control module, intake manifold vacuum leak, low cylinder compression.

Aug 24, 2009 | 1999 Pontiac Grand Am GT

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99 cougar v6 P0352 misfire cylinder 3 and 4 replaced igntn coil..

Had the same problem, car was misfiring on cylinder 3 and 4. replaced wires, plugs, and ignition coil. still misfired on the same cynlinders. turned out the main engine wiring harness plug in was coming loose. spent well over $150 on the unneccesary repairs and ultimately fixed the problem wit a $3 bag of wire ties to hold the plug in...

May 04, 2009 | 1999 Mercury Cougar

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Check engine

If you swapped 1 & 3 ignotion coils and the misfire didn't move. it probably would be a good idea to move the spark plugs to different cylinders and also the injectors. If you have the tools, perform a compression check to see if those cylinders might have low compression

May 04, 2009 | 2001 BMW 5 Series

1 Answer

Check engine light on. 4 cylinder. Light flashes on acceleration. Sometimes idles rough. Computer scan reads random misfire and #2 & #3 misfiring. Added fuel injector cleaner but no help yet. Cleared...

There are three kinds of gasoline engine misfire scenarios, first there is the "under load" misfire and there is the "at engine idle" misfire, and finally there is misfire continuously. All engine misfires exist because one of three things has occurred. First, a cylinder has lost compression, a cylinder needs a certain amount of compression to operate correctly. Second, the ignition system has failed or is failing intermittently, spark is needed at the time of compression to ignite the fuel air mixture. Third, the fuel air mixture is incorrect, proper mixture is needed for the ignition system to ignite fuel properly. If any of these conditions occur in the engine, the engine will misfire.
1. Low or no compression can be caused by

a. burned or leaking intake or exhaust valves
b. worn or broken piston or piston rings
c. worn out camshaft
d. wrong weight motor oil was installed holding the cam followers from adjusting
e. broken valve spring
f. failed head gasket.
2. Ignition system has failed or is failing
a. spark plug has fouled or is worn out
b. ignition coil
has failed
c. spark plug wires have shorted
e. engine control module coil driver has failed
3. Fuel/Air Mixture is incorrect
a. vacuum leak at the intake manifold
b. fuel injector has failed
c. EGR valve is stuck open
d. mass air flow sensor has failed
e. oxygen sensor has failed
f. air intake boot is cracked

common problems:
1. fuel injector has failed or is failing
2. spark plug wire has shorted
3. spark plug is worn out or is cracked
4. ignition coil has failed is failing

Testing a coil on the car is pretty easy. No special tools are required. Just remember to be careful, the amount of electricity generated by your ignition system can be dangerous. If your coil is already off the car, or if you would like a more specific data-driven test, you can bench test your coil. To set up the test, remove one spark plug wire from its plug, then remove the spark plug using a spark plug socket. Next put the spark plug back into the spark plug wire. Be careful not to let anything drop into the empty spark plug hole -- very bad.

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