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Old 05-11-2022, 09:25 AM   #1
stinkbelly
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I have a 2009 bmw 328i with the 6 cylinder engine. For a while (more than a year) it has had an issue while idling. The rpm usually sits around 800 at idle, while sitting there, the rpm will drop to about 600 and then go right back to 800. It does this over and over. It will shake the car. It is sometimes worse and other times not as bad. I will also feel it while driving if I am just coasting and not pressing on the gas. I put the highest octane gas in it always. I have noticed that if I put in Chevron Techron complete fuel system cleaner it won't have this issue for that tank and usually the one after it. By the 3rd tank, it is back hiccupping. I put the techron in it about every other tank for more than a year.

So what is the techron doing that makes it work and what is wrong with the car?
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Old 05-11-2022, 10:23 AM   #2
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Sadly, what is wrong with the car is the badge on it that says BMW. They don’t exactly have the best reputation for long term reliability which is why you can buy them used for so cheap.

If adding Techron is helping then you probably have an issue with the fuel system, more than likely injectors. Has this problem ever triggered a check engine light? If it has, it is probably for a cylinder misfire. That would tell you which cylinder is having the problem.
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Old 05-11-2022, 10:33 AM   #3
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When my wife’s 325i did that it was a spark plug. Changed them all and the coils too and it was back to smooth idle
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Old 05-11-2022, 10:35 AM   #4
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No clue on anything related to BMW but I would start with the fuel filter. Also I would try to get on some of the BMW forums or FB groups. No matter what care you have there seems to be a group of people somewhere that know them backwards and forwards, you just got to find them.
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Old 05-11-2022, 11:32 AM   #5
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No check engine light have ever come up.
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Old 05-11-2022, 11:50 AM   #6
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cheap fixes would be spark plugs. more expensive but fairly inexpensive would be mass airflow sensor, O2 sensor, coil packs and you could do them yourself. a good mechanic could diagnose so you aren't just throwing new parts at a problem that isn't there.
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Old 05-11-2022, 12:38 PM   #7
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Plugs and Coil packs
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Old 05-11-2022, 03:36 PM   #8
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Might look at the throttle position sensor .
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Old 05-11-2022, 04:08 PM   #9
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This sounds like your problem. Easy fix. I owned a 2007 325i that did the same thing.
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Old 05-11-2022, 04:11 PM   #10
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Originally Posted by stinkbelly View Post
I have a 2009 bmw 328i with the 6 cylinder engine. For a while (more than a year) it has had an issue while idling. The rpm usually sits around 800 at idle, while sitting there, the rpm will drop to about 600 and then go right back to 800. It does this over and over. It will shake the car. It is sometimes worse and other times not as bad. I will also feel it while driving if I am just coasting and not pressing on the gas. I put the highest octane gas in it always. I have noticed that if I put in Chevron Techron complete fuel system cleaner it won't have this issue for that tank and usually the one after it. By the 3rd tank, it is back hiccupping. I put the techron in it about every other tank for more than a year.

So what is the techron doing that makes it work and what is wrong with the car?
Don't listen to these guys. BMW's are good. I've had 8 a span of 11 years. Your first issue is you bought a 328. Should have nought the greatest engine of all in the 335i. Secondly it's your spark plugs or ignition coils. Try going WOT and see if it stutters. Lastly it could be your injectors which sucks. You could also need a walnut blasting.
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Old 05-11-2022, 04:19 PM   #11
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Pretty sure if you have a bad coil it would throw a code.
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Old 05-11-2022, 04:33 PM   #12
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We just bought a 2022. The day before the warranty dies I will sell it...
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Old 05-11-2022, 04:42 PM   #13
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I believe I have the N51B motor. I don't know if that matters.

Without a code, how do I know which coil to change?
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Old 05-11-2022, 04:44 PM   #14
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Quote:
Originally Posted by 91cavgt View Post
Sadly, what is wrong with the car is the badge on it that says BMW. They don’t exactly have the best reputation for long term reliability which is why you can buy them used for so cheap.

If adding Techron is helping then you probably have an issue with the fuel system, more than likely injectors. Has this problem ever triggered a check engine light? If it has, it is probably for a cylinder misfire. That would tell you which cylinder is having the problem.
This. I wouldn’t own one if someone gave it to me.
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Old 05-11-2022, 05:35 PM   #15
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Pretty sure if you have a bad coil it would throw a code.
Not necessarily, you could have 1 or more that's leaking and it wont throw a code

Sent from my SM-G892A using Tapatalk
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Old 05-11-2022, 05:46 PM   #16
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I believe I have the N51B motor. I don't know if that matters.

Without a code, how do I know which coil to change?
Change all 6 spark plugs and coils. That way you won't have to keep changing every week when they start failing. Plus it's better for the car. But what do I know. Not like i tune them and my whole family has a euro car repair shop.
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Old 05-11-2022, 05:52 PM   #17
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Don't listen to these guys. BMW's are good. I've had 8 a span of 11 years. Your first issue is you bought a 328. Should have nought the greatest engine of all in the 335i. Secondly it's your spark plugs or ignition coils. Try going WOT and see if it stutters. Lastly it could be your injectors which sucks. You could also need a walnut blasting.
8 in 11 years? You definitely seem like the authority on long term bmw ownership.
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Old 05-11-2022, 06:44 PM   #18
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8 in 11 years? You definitely seem like the authority on long term bmw ownership.
Who said I didn't keep a few at all times? I had a winter and a summer driver. Do you only have one vehicle? Or one gun? Maybe one pair of shoes?
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Old 05-11-2022, 10:15 PM   #19
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Who said I didn't keep a few at all times? I had a winter and a summer driver. Do you only have one vehicle? Or one gun? Maybe one pair of shoes?
Ive got quite a few, all high mileage, all owned since new.

Done the maintenance on all of them. Have any questions of long term ownership?
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Old 05-11-2022, 10:23 PM   #20
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Change all 6 spark plugs and coils. That way you won't have to keep changing every week when they start failing. Plus it's better for the car. But what do I know. Not like i tune them and my whole family has a euro car repair shop.
Yea, spend several hundred when you don't know what the problem is. Techron clears it up temporarily. It say it's not the coils.
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Old 05-11-2022, 10:54 PM   #21
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How many miles are on it?
Pull a spark plug and look at the pistons and valves. They make some really good boroscopes for @$60. It might have valve stem seals that are leaking. What happens when you run Top Tier fuel in it? They can “ hunt for idle “ a lot of ways. Next time I’m at the Bimmer store I’ll see what is a good strategy to diagnose/ heal your complaint. Coil replacement is a waste. That cars smart enough to know when a coil fails.
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Old 05-11-2022, 11:36 PM   #22
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Who said I didn't keep a few at all times? I had a winter and a summer driver. Do you only have one vehicle? Or one gun? Maybe one pair of shoes?
PL we appreciate your knowledge. You're still young here on the site. Pump the brakes a tad. It'll be alright.
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Old 05-11-2022, 11:59 PM   #23
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Winter and Summer? The running joke is buy two Jaguars….
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Old 05-12-2022, 07:02 AM   #24
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Originally Posted by PLBowhunter View Post
Don't listen to these guys. BMW's are good. I've had 8 a span of 11 years. Your first issue is you bought a 328. Should have nought the greatest engine of all in the 335i. Secondly it's your spark plugs or ignition coils. Try going WOT and see if it stutters. Lastly it could be your injectors which sucks. You could also need a walnut blasting.
Explain please?
What are you blasting with walnuts to fix mechanical problems?
Or did you get auto corrected and meant something else?

If adding fuel additive helps I would suspect fuel system issue

If you have not or getting close to time, new plugs and new fuel filter to see if either helps. Cheaper than digging into fuel system (injectors, pressure regulators, etc) plus needed maintenance anyway.
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Old 05-12-2022, 07:27 AM   #25
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Winter and Summer? The running joke is buy two Jaguars….
Yessir. It's necessary because when I lived in Canada it was not possible to drive in a few feet of snow, plus I needed a truck to go ice fishing and hunting. I did take my RWD 335i ice fishing once but hit a rock under the snow and decided that it's better to just have a truck with 4x4 anyways.
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Old 05-12-2022, 07:33 AM   #26
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130,000 miles on the car
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Old 05-12-2022, 07:34 AM   #27
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Explain please?
What are you blasting with walnuts to fix mechanical problems?
Or did you get auto corrected and meant something else?

If adding fuel additive helps I would suspect fuel system issue

If you have not or getting close to time, new plugs and new fuel filter to see if either helps. Cheaper than digging into fuel system (injectors, pressure regulators, etc) plus needed maintenance anyway.
I forgot the car mentioned is a non turbo. In the turbo, direct injection engines the intake valves need to be walnut blasted. You use a sand blasting kit, but use walnut shells to clean all the carbon buildup.

Honestly at this point I don't know. The techron could just be a bandaid and not really fixing the issue.

To the comment that said it's a few hundred dollars to replace the ignition coils and plugs, it's not. It's $231 on FCPauto. All you need is a special socket that you can buy at any auto shop and do it yourself. It takes an hour at most to replace them yourself.
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Old 05-12-2022, 08:06 AM   #28
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Isn't $231 a few hundred dollars?? I was born at night but.....
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Old 05-12-2022, 08:32 AM   #29
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Isn't $231 a few hundred dollars?? I was born at night but.....
Nah that's a couple. A few is $300 plus. It's simple arithmetics

Now you're just getting into semantics. A handful of groceries is now a few hundred at Costco.
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Old 05-12-2022, 08:51 AM   #30
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Get the A/C checked. It could be the compressor kicking off and on. It will make a difference on the smaller engines.
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Old 05-12-2022, 08:21 PM   #31
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Get the A/C checked. It could be the compressor kicking off and on. It will make a difference on the smaller engines.
I suppose you’ve been fooled once. Not a poor idea. Good call.
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Old 05-12-2022, 09:04 PM   #32
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Thanks for the ideas
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Old 05-12-2022, 09:09 PM   #33
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This. I wouldn’t own one if someone gave it to me.
Wow. Have 'em call ME. I've never turned down a free car. Well, not that I've ever been offered one...
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Old 05-13-2022, 06:57 AM   #34
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I suppose you’ve been fooled once. Not a poor idea. Good call.
My truck is doing this right now. RPM jumps up and down a couple of hunert each time the compressor kicks on and off. I just haven't fixed it yet.
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