[mayanh8]

My 335i "hiccups" constantly when I accelerate at low rps. This is a recent development after getting the hpfp replaced about 2 months ago. The service guy at the local BMW dealership says its my fault for stepping on the gas in 3rd gear at 3k rps. He then proceeded to tell me that my car has a race engine and it needs to be driven at high rpms to avoid the turbo lag that is causing the problem.

Has anyone else been told this by their dealership? The guy pretty much refused to look at the car and I feel like I'm being played for a fool.

[JohnSprm69]

you are not crazy


sounds about right if you step on the gas at high gear and low rpms for the car to lag or "hiccup" specially if you have a 6mt.

now about the race engine and needing to be driven at high rpms thats BS they are feeding you at least they should have checked out the car.

[Wires]

Originally Posted by mayanh8

My 335i "hiccups" constantly when I accelerate at low rps. This is a recent development after getting the hpfp replaced about 2 months ago. The service guy at the local BMW dealership says its my fault for stepping on the gas in 3rd gear at 3k rps. He then proceeded to tell me that my car has a race engine and it needs to be driven at high rpms to avoid the turbo lag that is causing the problem.

Has anyone else been told this by their dealership? The guy pretty much refused to look at the car and I feel like I'm being played for a fool.

Complete BS. At 3k you're already at full boost, and there is no lag. In 3rd gear I can step on it, and it just pulls.

Sounds like you have an issue with the injectors. Before I got my HPFP recall, I had issues like that. During the recall, they swapped out 3 and it's been fine.

[Alpine Whiteboy]

Wow if your car has a race engine, imagine what's equipped in an M6!

[RoundelM3]

I drive my E92 6MT at 1500-2000 rpm in 3rd and mine never bucks or stumbles. It's your service guy, not you car, that has something wrong with it.

[Year's_End]

Originally Posted by mayanh8

My 335i "hiccups" constantly when I accelerate at low rps. This is a recent development after getting the hpfp replaced about 2 months ago. The service guy at the local BMW dealership says its my fault for stepping on the gas in 3rd gear at 3k rps. He then proceeded to tell me that my car has a race engine and it needs to be driven at high rpms to avoid the turbo lag that is causing the problem.

Has anyone else been told this by their dealership? The guy pretty much refused to look at the car and I feel like I'm being played for a fool.

Tell him he's a complete jackass. Ask the service guy "what's the point of the engine making peak torque at 1500rpm". BMW wouldn't advertise it if you weren't supposed to be able to access and use it.

The engine is a regular, mass-produced block. It's not some special M-branded powerplant. If it has problems like that again, get them to fix the issue and don't listen to that BS.

[j2m]

You're not crazy! There you go.

[mayanh8]

Thanks for the responses. I'm no expert and I don't even claim to be an enthusiast. But I'm pretty sure turbo lag doesn't equate to the motor shaking violently at 3000 rpms. What really chaps my *** is that after he tells me it's turbo lag he boasts about how he races these cars on the weekend, as if that was a qualification for diagnosing the car without letting a mechanic touch it.

At the end of the conversation he also told me that he can fix the problem by programming the car differently but I wouldn't like what would happen at the "top end." At that point I'd had enough of him beating the piss out of my car and I just wanted him to hand the keys over so I could leave.

Any ideas on what I can do? This was the second time I took the car into this dealership.

[Trojan4evr]

yeah you need to call his BS on it. people just pull stuff out of their asses.

[tibra1]

Originally Posted by Wires

Complete BS. At 3k you're already at full boost, and there is no lag. In 3rd gear I can step on it, and it just pulls.

Sounds like you have an issue with the injectors. Before I got my HPFP recall, I had issues like that. During the recall, they swapped out 3 and it's been fine.

Agree this is not normal for an MT at 3K..you may have to do some data loggig to see whats going on

[stltri]

OP...

I had similar symptoms to yours before. Had multiple trials of fixes. No luck. Turned out to be the solenoids sticking. After replacing both, the hiccups disappeared. If you've tried everything and nothing helps, look into this possibility.

[Bimmer84]

[Jared72886]

Originally Posted by mayanh8

My 335i "hiccups" constantly when I accelerate at low rps. This is a recent development after getting the hpfp replaced about 2 months ago. The service guy at the local BMW dealership says its my fault for stepping on the gas in 3rd gear at 3k rps. He then proceeded to tell me that my car has a race engine and it needs to be driven at high rpms to avoid the turbo lag that is causing the problem.

Has anyone else been told this by their dealership? The guy pretty much refused to look at the car and I feel like I'm being played for a fool.

Your not crazy. The guy you spoke with is an idiot and his explanation makes no sense.

[username604]

I have the same thing, when applying full throttle in mid rpms. If this isn't bogging then i'd like to know what it is so that i can go in for service.

[mayanh8]

In particular, I only get the motor to start hicupping after 2nd gear. 1st and 2nd gear has no problem whatsoever. But starting in 3rd gear all the way through 6th, it will misbehave if I don't feather the throttle very carefully.

Does this sound like what you guys are experiencing/experienced.

[ErvGotti]

It's definitly not normal like everyone is saying, I went out and after a nice warmup went WOT in 3rd at 2k RPM's and it pulled just fine, then tried it at 1.5k RPM's and it pulled fine albiet a bit slow but no shakes. As to what it can be there's so many factors. I would try to scan it and see for codes, then start with the plugs, coil packs, and injectors. Also I've heard of the carbon build up causing this problem so maybe it's time for a cleaning. Lastly change dealership because your's is playing you for a fool.

[Wires]

Originally Posted by mayanh8

What really chaps my *** is that after he tells me it's turbo lag he boasts about how he races these cars on the weekend, as if that was a qualification for diagnosing the car without letting a mechanic touch it.
.

He could race caqrs every weekend, doesn't mean he knows sh*t about it's operation!

Every watch the movie "Days of Thunder".

[tunachris]

I was up in Montana and Wyoming a couple of months ago. I got the same thing when I stepped on the gas, there was a delay in acceleration and it felt like the engine was bogging down. I chalked it up to "turbo lag". Since I have been back in SoCal I have not experienced it again.

I'm thinking it may be a combination of high alltitude and crappy gas with ethanol in it. This was happening when I was trying to pass a couple of times, at 5,000 feet or higher elevation. I also had the car go into limp mode a couple of times on the way back in Idaho, again when I was accelerating WOT. Car has not repeated this since I have been back.

[JuppiOne]

I agree with others, it should not have happened at 3k rpm and wot, at 1.5, it could happens, since your computer may be adjusting the timing due to ping and knocks at wot at 1.5 rpm, but not at 3k, take it back to the dealer, or find a different, there got to be something else causing this issue.

[bkrM3]

I've had this happen - misfires on low RPM/high load pulls in the taller gears. It does sound like youre talking about misfires here - i.e., the engine shaking like crazy when you try to accelerate. Probably eventually 'fixes' itself and stops vibrating, especially after restarting the car.

In my situation the dealer said software (that didnt fix it), then stated this was "sticking VANOS," which, of course, it was not. They did replace the exhaust side VANOS solenoid. They then swapped injectors 2 and 5, problem was temporarily resolved. Injectors were later replaced for same issue.

My car has had 11 injectors replaced in 31,000 miles. Good luck trying to reproduce the problem at the dealer - once you think you can get it to act up on purpose take a ride with the shop foreman, not the dbag SA.

[Alpine300zhp]

This problem is common and it is related to injector buildup and carbon buildup on the intake valves. I have been able to solve this problem by doing three things:

1) BMW fuel system cleaner bottle every 5k miles - I dont care what anyone says....it works

2) Use good gas and change the brand of gas every few tanks. For example...I ll use Shell for 2k miles and then fill up with BP and then go back to Shell. Different gasolines have different additives and, for some reason, using the same gas all the time leads to additive buildup on the injectors. Also, the N54 does not like cheap gas. Stick to Top Tier/BP gas. Cheap gas screws up this motor big time.

3) At least once a month do a high RPM drive for 30-40 minutes...by high RPM I mean 4k-4.5k RPM in 4th gear at 75-80mph. This helps to burn off the carbon buildup on the intake valves by getting the motor hot enough to cause it to burn. Some people compare it to the self-cleaning feature on your stove oven.

I had the same problems as the OP off and on for 50k miles and ever since I adopted the above routine my N54 drives perfectly and pulls like a beast.

[El Cheapo Loco]

because race car