Just changed the ignition coils. Fixed it!! I recommend getting BOSCH or an OEM equivalent brand.
my issue was the same which ended up being coils and hpfp
since you changed the coils ( Bosch is best ) I would look at the fuel next.
I replaced the spark plugs over the weekend, and I’m doing the ignition coils tomorrow replacing them with brand new Delphi’s.
When you buy on Amazon, make sure you buy directly from the manufacturer. You are right. A bosch ignition coil costs $34 at the official bosch store in amazon, while it costs $60 at advanced auto parts.
I changed my ignition coils to delphi aftermarket ones and the idle is nice and smooth now. But the old ones had like 200k km on them.
That's the Delphi coil. It's the updated part from the original all black Bosch. It's the only one I put in my customer's cars.
Found another store and borrowed vehicle to get a Bosch. Swapped out the carquest one and SEEMED FIXED AGAIN…same thing, ran good for about 5 miles and went back to same symptoms.
Probably the coils. The Bosch coils I’ve used in the past on my 330Ci (same coils) lasted maybe 20K. Delphi are much better.
Stick with the stock Delphi’s. I went with Bosch recently and half of them died within a day (N55). FCP swapped them out, no questions asked, but still a PITA to do the work multiple times.
I don’t like the Delphi ones cause they come apart, if you do spark plugs again say 20k miles passes you could deal with the silicone tube on the end getting stuck down when pulling them, then you gotta be careful and get the spring and that out without the spring flying off somewhere.
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If choosing ignition coil across many manufacturers, check the part ranking. If your choice is down to two brands, the PartReview part comparisons help.
We compare ignition coil across these categories:
In March 2026 on PartReview, ignition coil Bosch were overall better than DELPHI.
In March 2026 on PartReview, ignition coil Bosch were overall more popular than DELPHI.
By vote balance, ignition coil Bosch surpassed DELPHI:
By number of reviews, ignition coil Bosch surpassed DELPHI:
In March 2026, according to PartReview, ignition coil Bosch led more car-specific ratings than DELPHI:
Bosch are chosen by owners of cars such as: Volkswagen Jetta, Volkswagen Tiguan, and others.
Ignition coil DELPHI have not yet taken leading positions in car-specific ratings. You can help by adding a review and specifying your car.
If this comparison didn’t fully answer your question, there are many others on PartReview.
For example, comparisons of ignition coil Bosch with: Denso, MSD, NGK, APR, HITACHI, OEM Volkswagen, BERU, Bremi, Duralast, OEM Audi.
Also available: comparisons of ignition coil DELPHI with: Denso, MSD, NGK, APR, HITACHI, OEM Volkswagen, BERU, Bremi, Duralast, OEM Audi.
You can also see who is better among other ignition coil manufacturers: Bosch or Denso, Bosch or MSD, Bosch or NGK, Bosch or APR, Bosch or HITACHI.
