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Old 01-12-2010, 10:43 PM   #1
CPV
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2001 330i spark plug problem

So I recently changed spark plugs to the Bosch Platinum 4417. Soon thereafter, the "Service Engine Soon" light appeared off an on over the past couple of weeks. Talked to a BMW specialty shop who tells me they often see problems with the Bosch spark plugs (engine miss, rough, etc) and suggested going back to the original NGKs.
Anyone have this similar problem?? Thanks.
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Old 01-12-2010, 10:49 PM   #2
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Bosch suck. Period.
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Old 01-12-2010, 10:49 PM   #3
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The majority suggest NGKs because of that reason.
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Old 01-12-2010, 10:53 PM   #4
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i have heard good things about Bosch platinum 4's i had no Choice and had to get OEM replacement Bosch from the dealer. put them in and had the same problesm miss fires rough idle ect took em back to dealer and they game me my money back used!

NGK or go home
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Old 01-12-2010, 10:58 PM   #5
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Bosch suck. Period.
You are very uninformed.
Bosch is OEM product as well as NGK.
That spark plug shouldnt cause any problems to your motor, as its the right one for it, as long as it was installed properly.

I use Bosch, and will use on every BMW I will own.
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Old 01-12-2010, 11:28 PM   #6
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^maybe he didnt get 4 prong?
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Old 01-13-2010, 03:37 AM   #7
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You are very uninformed.
Bosch is OEM product as well as NGK.
That spark plug shouldnt cause any problems to your motor, as its the right one for it, as long as it was installed properly.

I use Bosch, and will use on every BMW I will own.
Most BMW professionals will recommend dealer OE plugs. Yes, they cost a fortune, but they are different than the OEM NGKs that you get online or at the parts store even though the part numbers cross reference. Spend the additional money to avoid the misfires and low power that many (not all) experience in 5k to 30k miles after new plug installation.
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Old 01-13-2010, 03:54 AM   #8
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The E36 had alot of problems with Bosh...but as for the E46 I've never heard of any problems with bosh...
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Old 01-13-2010, 05:00 AM   #9
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I've heard this time and time again with the Bosch vs. the NGK. I truly have no clue as to why either, since Bosch is a quality company just like NGK, and make many other parts of the E46. Bosch occasionally have problems, but NGK are flawless.
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Old 01-13-2010, 06:56 AM   #10
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switch to NGK and see if that solves your problem. While your in there, search for other common things that cause misfires, like a torn intake boot.
Also have your coils been recalled? Check to see if they are Bremi.
Or maybe the connections to your coils are just loose
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Old 01-13-2010, 08:46 AM   #11
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I use Bosch Platinum +4, no problem at all and I like them very much, make sure that all the plugs are tight and the two ground wires on coil #1 and #6 are connected properly. You can also switch back to the old NGKs to see it is indeed the Bosch plugs are causing the problem. I highly doubt it!

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Old 01-13-2010, 09:15 AM   #12
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..I think I will be swapping in some new plugs. I have been having a weird "shut down" noise when I park. Sounds like its stalling when I turn the car off. So annoying cause its intermittent.

Any ideas?
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Old 01-13-2010, 09:53 AM   #13
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Quote:
Originally Posted by CPV View Post
So I recently changed spark plugs to the Bosch Platinum 4417. Soon thereafter, the "Service Engine Soon" light appeared off an on over the past couple of weeks. Talked to a BMW specialty shop who tells me they often see problems with the Bosch spark plugs (engine miss, rough, etc) and suggested going back to the original NGKs.
Anyone have this similar problem?? Thanks.
Had the same problem is both of my E46 330i/Ci's. Once they had the NGK for whatever reason they ran like a top! It was odd, because I'd never had a noticeable difference when changing out spark plugs. But once the NGK were in, the car felt new and revitalized.

Bosch makes fantastic products, and I in fact just purchase their plugs for my E28 M30, but for whatever reason the M52/4 seems to respond better to the NGKs.

Because of this we have created kits with both, but I always recommend the NGK for the 330's.


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Old 01-13-2010, 11:03 AM   #14
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i installed bosch from adanced auto and my car is smoother and hasn't had any problems at all.. just make sure you get bosch with 4 prongs like someone else mentioned.. first, they gave me with only 1 prong.. lol..
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Old 01-13-2010, 12:09 PM   #15
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i installed bosch from adanced auto and my car is smoother and hasn't had any problems at all.. just make sure you get bosch with 4 prongs like someone else mentioned.. first, they gave me with only 1 prong.. lol..
yeah def dont do 4 prong.
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Old 01-13-2010, 12:18 PM   #16
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yeah def dont do 4 prong.
What? are cars come with 4 prong for a reason. my friend put 1 prong NGK's on his ci and it threw codes. The BMW tec i talked to said that the engines are meant for 4 prong spark plugs. as far as im conscenrd use what ever the car come from the factory unless they are champion

Bosch Does make a good product Back in the day Champion plugs where good but they where bought out and the orginal owner of Champion made a new brand called bosch. Well i think thats how the sory goes
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Old 01-13-2010, 12:33 PM   #17
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RealOEM gives very specific part numbers for both Bosch and NGK plugs: Bosch FGR7DQP and NGK BKR6EQUP.
http://www.realoem.com/bmw/showparts...51&hg=12&fg=05


It's quite possible that Bosch uses the description "Platinum +4" to refer to a whole line of plugs, with many different part numbers and applications. So to say that you bought "Bosch plugs" isn't particularly meaningful.

Also, the Bentley manual recommends the aforementioned NGKs.
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Old 01-13-2010, 01:06 PM   #18
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What? are cars come with 4 prong for a reason. my friend put 1 prong NGK's on his ci and it threw codes. The BMW tec i talked to said that the engines are meant for 4 prong spark plugs. as far as im conscenrd use what ever the car come from the factory unless they are champion

Bosch Does make a good product Back in the day Champion plugs where good but they where bought out and the orginal owner of Champion made a new brand called bosch. Well i think thats how the sory goes
OOPs that was a typo.. lol.

i meant 1 prong... i meant "definitely dont do 1 prong" while thinking "definitely DO 4 prong"
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Old 01-13-2010, 07:43 PM   #19
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Thanks all. Put the NGK's back in last night. So far, so good. Will let you know what I find out over the next few weeks. Very odd. I've never had a spark plug issue in all my days (this is my 5th BMW). Have owned big and small block Chevy's and Fords over my years (use to have a job rebuilding those and never experienced a problem like this unless the plug was cracked/bad). Thanks again.
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Old 01-13-2010, 08:24 PM   #20
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Are they 4 prongs? Did you see any unusual thing on the Bosch plugs, check gap to see any one is mis-gaped or oily something like that, and give us the update.
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