09-15-2018, 04:15 PM | #1 |
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This ONE issue... need your help!
I have been having this one issue for a while. When accelerating (3/4 to full throttle), the car shakes violently and DING! --- drivetrain malfunction. Then, at idle, the car shakes very rough. If I turn off the engine for about 20 minutes, the warning goes away and the car is fine. As long I don't floor it, the car is fine.
Went to the dealer 3 times for this: replaced all spark plugs, mass air flow sensor, etc... and the issue keeps coming back! So I went to an independent mechanic. He test drove it and got these results. The X5 had 20 miles worth of gas left and he pointed that out. "Don't drive the car when it's running below quarter tank!" he says. He says that COULD be one of the contributing factors, since there's a pump inside the tank and having plenty of fuel is important (I don't remember the exact explanation, but something along the lines of that). So I filled up the tank and floored it, and the problem reappeared. Other than this, nothing wrong with the X5, which I am thankful. But it's this ONE issue that keeps coming back. Anyone know why this happens? I'm all ears here. Thanks.
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09-15-2018, 05:08 PM | #2 |
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Lets assess and eliminate the probability of this misfire and correlate what you've done.
ISTA/D says to eliminate the following Air supply Ignition Fuel Supply Electrical Mechanical -Air supply, which you've already addressed with new maf, and no other codes are indicating this issue it can be R/O, however check the air filter and replace as needed and inspect any intake hoses for leaks. -Ignition, you've already replaced the plugs but no avail, perhaps check the coil packs? If you're handy you could switch around the Coil packs to see if the cylinder misfire follows the coil pack, But you need to find out of cylinder 3 and 6 is are always misfiring when you floor (as noted in fault code multiple misfire) it which means you need a code reader perhaps an OBD II reader should suffice. -Fuel Supply, now it did say fuel injector cut off on 3 and 6 but its performing that under misfire circumstance (ie Engine Malfunction Light) to protect the engine, however it should be taken consideration if the Ignition coils are not the culprit, and if cylinder 3 and 6 keeps misfiring and shutting off the injectors, a more comprehensive diagnostic is needed for that case. -Electrical its safe to say its not electric since there aren't any other codes indicating it however it should be taken in consideration if the preceding does not rectify -Mechanical, very unlikely since the engine performs normally, as per stated and no codes indicating it. Keep us updated Last edited by Mr.47; 09-15-2018 at 05:16 PM.. |
09-15-2018, 05:54 PM | #4 |
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+1 for coils
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09-15-2018, 06:04 PM | #5 |
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Can you log fuel pressure? Sounds similar to how my n54 motor acted when the hpfp was going. When I logged it you can see the drop in pressure from 800-900 to below 100 when in the upper rev range. That's when things go bad and the motor protects itself. So worth a shot.
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09-15-2018, 06:29 PM | #6 | |
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The other possibility is bad fuel injector. Highly doubt it’s fuel pump as you are only showing issue with one cylinder. If it was fuel pump, I assume it would cause other cylinders to misbehave. |
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09-15-2018, 07:39 PM | #7 |
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had similar issues on my 335is with n54 engine. for a few months driving it hard would cause the car to stutter at high rpms and trip warnings, and then a bad idle, but restarting the engine and driving normally seems to clear up the errors/stuttering problem. didnt look into it for quite some time and one day the car would not idle anymore, it would crank, fires and dies. turns out 3 of the 6 injectors were bad, and of course happened 1 month after warranty expired.
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09-15-2018, 08:52 PM | #8 |
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Had the same exact problem with my old 03 325i. You could ease into it and it would be fine, but if you floored it it would stall and stop and shake and all the cluster lights would flash. I don’t remember what or if I ever found the problem.
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09-15-2018, 11:29 PM | #9 |
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Did you burn it?
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09-15-2018, 11:48 PM | #10 | |
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09-15-2018, 11:52 PM | #11 |
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Correct. When dealer changed all spark plugs, it was smooth for a few days, but that was it: only a few days. I'm surprised that after three visits, they were still unable to diagnose the problem.
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09-15-2018, 11:54 PM | #12 | |
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09-15-2018, 11:57 PM | #13 | |
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09-15-2018, 11:58 PM | #14 |
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That's exactly the issue! This is starting to sound a more common issue than I thought it'd be.
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09-16-2018, 05:20 AM | #15 |
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I had the same problem and the same codes. I changed my plugs first and that didn't rectify the issue. I changed the coils next and... voila, no more problems.
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09-16-2018, 07:26 AM | #17 |
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09-25-2018, 11:41 AM | #19 |
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I have 41,000 miles now. The problem started a while ago, progressively getting worse until now. Taking it to the indy mechanic today!
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09-26-2018, 05:06 PM | #20 |
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Ignition coils #3 and #6 replaced. Drives much better but there's minor shaking when accelerating. I think now that the bad coils were replaced, the computer is detecting other coils that are starting to go bad.
Would it be best to replace all coils at this point?
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09-27-2018, 02:56 PM | #21 | |
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Sometimes a coil might go bad, but not be in such a bad shape to throw a code. However, it can cause slight misfire. You will mostly feel this under heavy load at low RPM. Coils are not traditionally considered a maintenance item, but in your case, what do you have to lose? Also, if you change out plugs, make sure they are gaped properly. If you get wrong plugs, or if they don't have right gap, they can cause poor performance and misfire. GL |
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