When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Engine vibrating on cold start but clears after it warms up.
Hi everyone
Am a first time Benz owner, bought 2015 ML 350 4matic at 115k miles.
Noticed the engine has this rough idling (also vibrates) during cold start. But after it warms up and switched off for about 20-30 minutes, the rough idling/engine vibration clears when you start the engine again.
I earlier suspected a faulty ignition coil, so we changed for bank 1 & bank 6, but the situation still persists.
I will appreciate some advice from your collective wealth of experience.
Can you use a scanner to scan ECU... & clear faults?
This will get it to relearn mixtures
Many Thanks Bro, for your assistance
How old are the spark plugs since replaced?
- cant say, only got the vehicle for about 1 month.
- We actually suspected a faulty ignition coil which was replaced but the issue persisted
"bank 6" is Bank 2 cyl. 6, right?
- yes bank 1 and bank 6
Can you use a scanner to scan ECU... & clear faults?
- Ok, i own a Bluedriver scanner, the last scan i did pointed to the injector but a quick check on google suggested poor quality fuel.
- Will re-scan and clear faults then observe behaviour
This is the cylinder arrangement. If you are able to scan your engine control I think you will find misfires on one or more cylinders. Most likely they will not occur above a warmer ambient temperature like 50F
This is the cylinder arrangement. If you are able to scan your engine control I think you will find misfires on one or more cylinders. Most likely they will not occur above a warmer ambient temperature like 50F
Hi everyone
Am a first time Benz owner, bought 2015 ML 350 4matic at 115k miles.
Noticed the engine has this rough idling (also vibrates) during cold start. But after it warms up and switched off for about 20-30 minutes, the rough idling/engine vibration clears when you start the engine again.
I earlier suspected a faulty ignition coil, so we changed for bank 1 & bank 6, but the situation still persists.
I will appreciate some advice from your collective wealth of experience.
Just to share feedback
The issue was partly pinned to faulty ignition coil on bank 6.
After replacement of faulty ignition coil on bank 6, i took the vehicle out for a long drive, with several shift down hard driving, the injector issue eventually cleared.
Guess it was some debris clogging the injector, being forced out under pressure during the long drive
I immensely appreciate everyone's contribution on this.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
