Engine Miss While Warming Up and Rough Shifting

Apr 30, 2014 | 10:15 PM

josephpampliega

Thread Starter

Member

Joined: May 2006

Posts: 87

Likes: 12

From: Vallejo, CA USA

15 MB Sprinter, 14 MB S550, 08 Smart Fortwo, 04 Dodge Sprinter, 87 MB 190E 2.3-16

Engine Miss While Warming Up and Rough Shifting

Question for other owners?

Just took vehicle delivery 3 weeks ago and now with approximately 300 miles and I have been noticing the engine intermittently miss while warming up after a cold start (more pronounced while in gear). Another observation is shifting is rough between shifts (feels like my 2007 S550 prior to transmission failing).

I will give transmission chance to adapt but in regards to engine miss is it only my vehicle or any of you experiencing the same?

Thanks. BTW, no check engine light.

May 1, 2014 | 08:40 AM

jrpisha

Member

Joined: Apr 2014

Posts: 187

Likes: 3

From: Traverse City, Michigan

2023 AMG SL55,2015 S550 4MATIC, 2023 BMW X5

Quote:

Originally Posted by josephpampliega

For what it's worth, I struggled with this same symptom with my BMW when it was new. The explanation offered by the dealer was that the emission controls were to blame for this short-term sacrifice in driveability. The engine's computer leans out the mixture while the cat's are warming up to keep emissions low. Once the cat's get up to temperature, the computer richen's (sp?) the mixture and the car runs normally. I have always hated this, but I don't think there's a way around it. I resolved to let my car warm up for a few minutes before I drive away in the morning. That usually allows the cat's to heat up and I don't experience the issue.

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