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Car Shifting Weird After Service. Please Help

Old Jul 19, 2021 | 01:21 PM
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Car Shifting Weird After Service. Please Help

Hi Guys,

I had the car serviced today and the below was done, but upon driving home the car is flaring in every upshift and slamming downshifts. It’s normally smooth in comfort mode and was fine when I dropped it off. Could any of the following work cause shift problems?

Engine Oil & Filter
Air Filters
Spark Plugs
Pollen filter

I am sure I have read of the years on this forum airleaks can cause weird shift issues. Do you think the airboxs, filters or the top two clamps on the engine cover are not tight enough of a seal causing this issue? Or maybe something hasn’t been put back correctly such as maf sensors or air filters?

Thanks

Last edited by Phil_T; Jul 19, 2021 at 01:23 PM.
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Old Jul 19, 2021 | 02:57 PM
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Strange could be maf sensors but you would think it would pop a check engine light, none has come up correct?
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Old Jul 19, 2021 | 03:02 PM
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Originally Posted by deadlyvt
Strange could be maf sensors but you would think it would pop a check engine light, none has come up correct?
Yeah nothing comes up, just awful shifting when on light throttle.
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Old Jul 19, 2021 | 03:20 PM
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Originally Posted by Phil_T
Yeah nothing comes up, just awful shifting when on light throttle.
Are you able to check fuel trims? Check the connections from the AIr box to the manifold inlet tube.
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Old Jul 19, 2021 | 03:21 PM
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Yeah start by checking all the maf plug ins, the air filter house bolts and the two clamps.
your symptoms would point me to low transmission fluid or what you might get right after a fluid change that has been left for too long between changing so odd that it comes from the work performed.

Last edited by deadlyvt; Jul 19, 2021 at 05:31 PM.
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Old Jul 19, 2021 | 04:33 PM
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Probably just crimped the air filters at the back causing a vacuum leak
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Old Jul 20, 2021 | 01:22 AM
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Originally Posted by dcpatters
Are you able to check fuel trims? Check the connections from the AIr box to the manifold inlet tube.
I don’t have anything to check those unfortunately, I will check to rest today.

Originally Posted by deadlyvt
Yeah start by checking all the maf plug ins, the air filter house bolts and the two clamps.
your symptoms would point me to low transmission fluid or what you might get right after a fluid change that has been left for too long between changing so odd that it comes from the work performed.
I will check all that today, It can’t be low trans fluid as like I said the car drove fine before the service and I watched them do the service from start to finish. The car was sat for 12 months prior but I took the car out for 2 days before the service and it drove perfect (even on the 2 hour journey to get the service yesterday)

Originally Posted by blurred
Probably just crimped the air filters at the back causing a vacuum leak
The actual panel filters themselves or the small tubes around that area?
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Old Jul 20, 2021 | 07:13 AM
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I am pretty sure I have fixed the issue, The drivers side (UK) maf rubber hose was pinched by the underside of the rubber/jubilee clip on the top of the airbox. I took it for a drive and all seems fine now.
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Old Jul 20, 2021 | 11:48 AM
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That’s good 👍
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