[aebas54]

2011 335xi 56000 miles sedan

I had my mechanic replace my plugs, now it it bucking/jolting violently at slight rpms. It only happened at high rpms but now it it doing it at 2500 rpms or higher. Took it back and no codes?


I am so lost, the mechanic doesn't seem to know why either.

Any help is greatly appreciated.


Thank you

[Silver99GSX]

Originally Posted by aebas54

2011 335xi 56000 miles sedan

I had my mechanic replace my plugs, now it it bucking/jolting violently at slight rpms. It only happened at high rpms but now it it doing it at 2500 rpms or higher. Took it back and no codes?


I am so lost, the mechanic doesn't seem to know why either.

Any help is greatly appreciated.


Thank you

I would take it back to your Mechanic and have him recheck the Gap on the plugs that you are using and also double check that each coil pack connector is fully connected. Also Did it have this problem before you took it in? Or just a routine maintenance?


Justin

[Jeff@TopGearSolutions]

Originally Posted by Silver99GSX

I would take it back to your Mechanic and have him recheck the Gap on the plugs that you are using and also double check that each coil pack connector is fully connected. Also Did it have this problem before you took it in? Or just a routine maintenance?


Justin

+1

[aebas54]

Problem only occurred after trip to mechanic. I am going through it now gonna check everything. A bit lost though.

[Wolf 335]

What plugs did you purchase?

[aebas54]

denso iridium

[Silver99GSX]

Originally Posted by aebas54

denso iridium

Do you know if they are a single fire or multiple? Cause if it's a single it sounds like the Gap may be off. I always check the Gap on any spark plug I use on any of my cars when doing a spark plug change, Just cause even know sometimes they say they are Pre-Gapped your mechanic should know to always double check a spark plug before putting them in. I'd say if he didn't check the Gap I would find another mechanic, Cause that is always #1 when doing a spark plug change. But that is just me Lol


Justin

[aebas54]

they only have one ground. What is the gap supposed to be? I just checked cylinder 1 and it is gap large.

[rhm135]

I prefer NGK. Haven't seen anything good with Denso in a BMW. But it could be plug gap, if you don't want to change plugs.

[aebas54]

.08 plug gap???

[rhm135]

Originally Posted by aebas54

.08 plug gap???

Wow. I run .022 in.

[Silver99GSX]

From what I see is the OEM Bosch plugs are Stock 0.7mm gap

[rhm135]

Originally Posted by Silver99GSX

From what I see is the OEM Bosch plugs are Stock 0.7mm gap

0.7mm=0.028in

[aebas54]

okay so i just checked the gap on one plug and it was 1.1 mm

Guessing this is the problem

[Silver99GSX]

Originally Posted by rhm135

0.7mm=0.028in

[Silver99GSX]

Originally Posted by aebas54

okay so i just checked the gap on one plug and it was 1.1 mm

Guessing this is the problem

Wow. I think once you re-gap them you should be good togo.

[rhm135]

Originally Posted by aebas54

okay so i just checked the gap on one plug and it was 1.1 mm

Guessing this is the problem

Yes I would say so.

[aebas54]

Problem solved. Thank you to everyone who helped!!