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Engine skipping/surging under load
Hi All,
Putting this in the "General" topic as I'm at a loss as to where my issue actually is. So the background is I have a 120 series, auto. I'm the second owner and it has been regularly serviced since new. The issue I have is the engine, typically when under load, will skip or surge as if it's misfiring. I'm not overly mechanically-minded so forgive me if I'm being a bit non-technical in my description
What I have worked out so far is the following:
- it is usually worse after rain - but not always.
- it is worse when in reverse and when steering (i.e. reversing out of a driveway).
- warm or cold engine makes no difference.
- it appears randomly; one day it will be really bad, the very next it will behave perfectly.
- it usually happens during idling or in reverse but has happened right up to 110km/hr (which is a real jolt).
- it very rarely happens under moderate to heavy acceleration.
- it does not happen in neutral.
- I can replicate it pretty consistently if I drive at 60km/hr then without changing acceleration, start up a gradual hill. The point at which the car decides it's time to drop down a gear (out of over-drive?), it will skip up to half a dozen times in quick succession before dropping down a gear and be ok again.
- when it first started happening, I tried disconnecting the battery which - perhaps coincidentally - make the problem go away for about a week before returning.
Last service I had, I wasn't able to replicate the issue as it seems to randomly appear and disappear though of late it's become worse and more consistent so hopefully I'll be able to demonstrate the issue to my mechanic. All the mechanic was able to guess at last time was fuel filter but a new one made no difference to the problem. Before I take it in for its next service, I'm just wondering if the above list of symptoms resonates with anyone here?
Appreciate anything I can take to my mechanic.
Cheers,
Gavin
Putting this in the "General" topic as I'm at a loss as to where my issue actually is. So the background is I have a 120 series, auto. I'm the second owner and it has been regularly serviced since new. The issue I have is the engine, typically when under load, will skip or surge as if it's misfiring. I'm not overly mechanically-minded so forgive me if I'm being a bit non-technical in my description
What I have worked out so far is the following:
- it is usually worse after rain - but not always.
- it is worse when in reverse and when steering (i.e. reversing out of a driveway).
- warm or cold engine makes no difference.
- it appears randomly; one day it will be really bad, the very next it will behave perfectly.
- it usually happens during idling or in reverse but has happened right up to 110km/hr (which is a real jolt).
- it very rarely happens under moderate to heavy acceleration.
- it does not happen in neutral.
- I can replicate it pretty consistently if I drive at 60km/hr then without changing acceleration, start up a gradual hill. The point at which the car decides it's time to drop down a gear (out of over-drive?), it will skip up to half a dozen times in quick succession before dropping down a gear and be ok again.
- when it first started happening, I tried disconnecting the battery which - perhaps coincidentally - make the problem go away for about a week before returning.
Last service I had, I wasn't able to replicate the issue as it seems to randomly appear and disappear though of late it's become worse and more consistent so hopefully I'll be able to demonstrate the issue to my mechanic. All the mechanic was able to guess at last time was fuel filter but a new one made no difference to the problem. Before I take it in for its next service, I'm just wondering if the above list of symptoms resonates with anyone here?
Appreciate anything I can take to my mechanic.
Cheers,
Gavin
and where it is. I'll pull it out and give it a clean and report back.
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