Engine Shake

A

amr

Member
hi guys
some days ago when started my z4 2.5i 03 in the morning and i found a the engine little shaky and after min or two the engine service alert shown on the dashboard
it happened before and i changed the ignition coils ( when i checked the coils that time I’ve found 5 damaged so i replaced them)
6 months ago i replaced the spark plugs.
its very annoying that shake .. but when i turn off the car and start it again sometimes the shake disappears. and it happens only when the car is cold. and the engine service alert disappears after few days also. ( in case it didn’t shake in the next day)
appreciate ur advises
Amr
 
Amr,

I just quickly googled this ("bmw engine shaking") and there a LOTS of issues catalogued for your symptoms, it may be worth a look. Id start off by looking at your pre-cat O2 sensor. Engine shaking to me sounds like a misfire and the fuelling is probably incorrect, due to the O2 sensor.
 
EdButler said:
Amr,

I just quickly googled this ("bmw engine shaking") and there a LOTS of issues catalogued for your symptoms, it may be worth a look. Id start off by looking at your pre-cat O2 sensor. Engine shaking to me sounds like a misfire and the fuelling is probably incorrect, due to the O2 sensor.
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Thanks Ed for ur reply.
yes i agree with u ... i think it has something to do with the fuelling, sometimes it sound like misfiring .. and that’s why i changed the spark plugs but no big change!.

i've checked online the Oxygen Sensor and i found (Bosch Oxygen Sensor) pre and after . i'll check both anyways and let u know. in case it was damaged do u recommend the OEM or Bosch?
 
got the car checked, it was the ignition coil !!! although i changed them before!!! i thought it has something to do with the fuel or the oxygen but it was the coils :)
 
amr said:
got the car checked, it was the ignition coil !!! although i changed them before!!! i thought it has something to do with the fuel or the oxygen but it was the coils :)
Click to expand...
correction .. after i went to the garage i found out he also changed the oxygen sensor ... now its running fine :)
 
amr said:
amr said:
got the car checked, it was the ignition coil !!! although i changed them before!!! i thought it has something to do with the fuel or the oxygen but it was the coils :)
Click to expand...
correction .. after i went to the garage i found out he also changed the oxygen sensor ... now its running fine :)
Click to expand...

Excellent news, glad she's working well again! :thumbsup:
 
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