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      10-15-2010, 11:00 AM   #1
Nex054
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Jerking/hiccuping sensation under hard acceleration

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Hey everyone. Just joined the forum today, glad to be a new owner of a E92 335i

First, a little background... after a couple months of deliberation I bought a 2007 certified pre-owned 335i 6MT in mid July with 26,500 miles. Four miles (yes, four miles) away from the dealer in my new car, I experienced the dreaded HPFP failure. Upsetting yes, but good to get the pump replacement out of the way before I needed the car to get to work or something like that.

Since then, the car has been fantastic. I love every minute behind the wheel. However, I have begun to experience this very strange jerking feeling under hard acceleration. It only seems to happen in higher gears at lower speeds (low-ish RPM). For example, on the highway around 30-40mph in 4th gear mash the throttle and as the RPMs rise past 3-4k there are tiny hiccups in the power delivery that cause a jerking sensation. It doesn't always at the same RPM, and is in no way consistant. I know that it is not a traction problem, because it only really happens at higher speeds.

I took the car to the dealer recently for the 30,000 mile service and mentioned it to the service guy. He said they would drive the car and attempt to reproduce the problem. When I returned the next day to pick up the car, he said they couldn't find the issue. I was happy at first, but quickly crushed to feel the exact same jerking upon leaving the dealership.

I'm probably going to return to the dealer sometime soon and go out for a ride with the mechanic to show him the issue. My completely uneducated guess would be that it something to do with the injectors or the spark plugs maybe? It doesn't feel like a transmission issue.. Any ideas of what the problem is or what I should do would be much appreciated. Thanks!
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      10-15-2010, 11:43 AM   #2
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Quote:
Originally Posted by Nex054 View Post
Hey everyone. Just joined the forum today, glad to be a new owner of a E92 335i

First, a little background... after a couple months of deliberation I bought a 2007 certified pre-owned 335i 6MT in mid July with 26,500 miles. Four miles (yes, four miles) away from the dealer in my new car, I experienced the dreaded HPFP failure. Upsetting yes, but good to get the pump replacement out of the way before I needed the car to get to work or something like that.

Since then, the car has been fantastic. I love every minute behind the wheel. However, I have begun to experience this very strange jerking feeling under hard acceleration. It only seems to happen in higher gears at lower speeds (low-ish RPM). For example, on the highway around 30-40mph in 4th gear mash the throttle and as the RPMs rise past 3-4k there are tiny hiccups in the power delivery that cause a jerking sensation. It doesn't always at the same RPM, and is in no way consistant. I know that it is not a traction problem, because it only really happens at higher speeds.

I took the car to the dealer recently for the 30,000 mile service and mentioned it to the service guy. He said they would drive the car and attempt to reproduce the problem. When I returned the next day to pick up the car, he said they couldn't find the issue. I was happy at first, but quickly crushed to feel the exact same jerking upon leaving the dealership.

I'm probably going to return to the dealer sometime soon and go out for a ride with the mechanic to show him the issue. My completely uneducated guess would be that it something to do with the injectors or the spark plugs maybe? It doesn't feel like a transmission issue.. Any ideas of what the problem is or what I should do would be much appreciated. Thanks!
2 guesses:

Injector or a cylinder misfiring.
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      10-15-2010, 01:14 PM   #3
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manual or auto?

Might need a re programming
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      10-15-2010, 01:35 PM   #4
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I had my car reprogrammed and this is happening . this happened RIGHT after reprogramming.

I've reset the computer and it doesnt resolve this problem.
My suggestion is a reprogram again... I havent been back for this yet (fyi)

ppp
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      10-15-2010, 01:54 PM   #5
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Manual. Just took it out and it seems to only be happening in the upper rev range now, in any gear. It's just more noticeable in the higher gears. Would I have to take it to a dealer for a reprogram or is it something I could do myself?
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      10-15-2010, 02:02 PM   #6
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      10-15-2010, 02:09 PM   #7
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I had similar problem. Dealership couldn't replicate the problem so had to send computer data to BMW, who told them to change out the entire fuel injector system. No more problems since the change.
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      10-15-2010, 02:46 PM   #8
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Quote:
Originally Posted by Nex054 View Post
Hey everyone. Just joined the forum today, glad to be a new owner of a E92 335i

First, a little background... after a couple months of deliberation I bought a 2007 certified pre-owned 335i 6MT in mid July with 26,500 miles. Four miles (yes, four miles) away from the dealer in my new car, I experienced the dreaded HPFP failure. Upsetting yes, but good to get the pump replacement out of the way before I needed the car to get to work or something like that.

Since then, the car has been fantastic. I love every minute behind the wheel. However, I have begun to experience this very strange jerking feeling under hard acceleration. It only seems to happen in higher gears at lower speeds (low-ish RPM). For example, on the highway around 30-40mph in 4th gear mash the throttle and as the RPMs rise past 3-4k there are tiny hiccups in the power delivery that cause a jerking sensation. It doesn't always at the same RPM, and is in no way consistant. I know that it is not a traction problem, because it only really happens at higher speeds.

I took the car to the dealer recently for the 30,000 mile service and mentioned it to the service guy. He said they would drive the car and attempt to reproduce the problem. When I returned the next day to pick up the car, he said they couldn't find the issue. I was happy at first, but quickly crushed to feel the exact same jerking upon leaving the dealership.

I'm probably going to return to the dealer sometime soon and go out for a ride with the mechanic to show him the issue. My completely uneducated guess would be that it something to do with the injectors or the spark plugs maybe? It doesn't feel like a transmission issue.. Any ideas of what the problem is or what I should do would be much appreciated. Thanks!
Got the same problem as well, 07 E90 335 manual trans. It mostly happens between 3-4k rpm, wide open throttle, running up rpm range, and is most noticeable in 3rd and 4th gear, prob b/c I'm usually not WOT in 5th and 6th at 3-4k rpm and it would be hard to notice it in 1st. To vague the problem out it only take air, fuel, and spark, timed correctly, to make a engine run seamless, and it feels like it's in the timing b/c the motor is buttery smooth everywhere else in the rpm range. One would assume if it's an injector, injector pump, or ignition issue it would happen all over the board. Do these motors have vanos? If so, is it an on off switch, or change with rpm. If it's an on/off switch does it start around ~3500 rpm?

Honestly, I just ignore it. I've had the car for a month and a half, already had a fuel tank siphon issue, if I have one more significant issue it'll be traded in. Sucks too b/c I love the car when it runs right.
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      10-18-2010, 08:14 PM   #9
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I have the same thing happen. I had a Dinan stage 2 flash done at our local BMW dealer who is also a Dinan dealer. The dealer called when I turned the car in for the Dinan flash and they told me they needed to do a computer reflash before they could do the Dinan flash ... apparently there was an older sofware version still in the PCm. Then they did the Dinan flash and now I too have this slight stumble under WOT acceleration mostly noticable in second through 3rd.

Been working with Dan from tech support at Dinan directly. Great guy and very customer focused!! HE says they have about six or so cars in the entire US which have the same problem and are unsure what it is. They are looking into a local Cali car with this issue to try to find out what it is. Supposed to follow up with him again at the end of the month.
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Last edited by Alex D; 10-18-2010 at 08:21 PM.
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      10-18-2010, 09:13 PM   #10
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Try with DTC off and see if it still happens.
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      10-18-2010, 10:09 PM   #11
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Quote:
Originally Posted by 07_335i_AW View Post
Try with DTC off and see if it still happens.
not my first car ... that was the first thing I tried ... no difference.
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      10-18-2010, 10:30 PM   #12
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that must have ruined your day to have gotten hpfp just after 4 miles
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      10-18-2010, 11:58 PM   #13
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Quote:
Originally Posted by Alex D View Post
not my first car ... that was the first thing I tried ... no difference.
Rodger that. Just a suggestion.
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      10-19-2010, 12:30 AM   #14
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I have the same problem, it does what you exactly described, at first I thought it was the transmission or clutch but after reading through this it might be the injectors.
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      10-19-2010, 10:41 AM   #15
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Dan from Dinan sayds he would bet it is the detonation/knocking sensors intevening. In an a related thread on bimmerforums Shiv from Vishnu says he also thinks that the knock sensoring system is pulling back timing.

Problem being that these N54 engines (same with like our Saab turbo) do not have real knock sensors, but actually measure ionization of the combustion as it occurs on firing the intake charge. How they do it nobody has ever been able to explain to me. I don't think there are any actual sensors.

I think I remember from a discussion on the Saab forum that in our Saab turbo engine the spark plug is actually the sensing unit .... somthing about the resistance of the current flowing through the plug during ignition measuring ionization and informing the computer of impeding detonation ... I think ...
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      10-23-2010, 11:37 PM   #16
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Did You ever get this issue resolved? I had the same thing happen to me a couple times around town then finally entering the highway on the way to the dealership. I actually got a SES light and pulled over, shut down then restarted and it was all good again. I did not get on it again after that happened the last time. The dealership said the fault code pointed to faulty injectors. Right now my car is getting both wastegates replaced for the rattle and possibly all injectors.
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      10-24-2010, 07:25 AM   #17
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Quote:
Originally Posted by 07_335i_AW View Post
Did You ever get this issue resolved? I had the same thing happen to me a couple times around town then finally entering the highway on the way to the dealership. I actually got a SES light and pulled over, shut down then restarted and it was all good again. I did not get on it again after that happened the last time. The dealership said the fault code pointed to faulty injectors. Right now my car is getting both wastegates replaced for the rattle and possibly all injectors.
No, the issue is still there. I had a note to call Dinan back this coming week, so we'll see. I am not too optimistic they will find a resolution to this issue anytime soon. I checked into the warranty record of my car before I bought it to check if it was one of those with lots of issues and it had very, very few items done in the first three years under warranty, basically only a O2 sensor replaced but also the waste gates due to turbo rattle. Otherwise only a few interior trim items the previous owner complained about. The car was always maintained at the BMW dealer since new and has a great service record.
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      10-24-2010, 04:58 PM   #18
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I hear that. Good luck. Hopefully they figure something out soon. It really sucks having this type of vehicle and not be able to enjoy it to its full potential.
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      10-25-2010, 10:43 AM   #19
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We'll see ... the issue is certainly noticable but it also not so bad that it would influence aceleration at all or noticably. You just can feel a few little blips in power as the car accelerates through the rpm range and speed builds. It's also only during WOT acceleration and not during part throttle acceleration and it is also not constant. Sometimes they are more noticable, sometimes less or not at all. Ambient temperature seems to have an influence on this phenomenon, but even at 40F outside it doesn't go away entirely.
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Last edited by Alex D; 10-25-2010 at 11:02 AM.
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      10-25-2010, 12:26 PM   #20
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Had the same thing on my '07 335. It eventually led to a limp mode. Dealer replaced the knock sensors (at least that's what they said). That cleared it for a while, but started doing it again (although not nearly as bad) about 2 weeks before I turned it in.
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      10-25-2010, 05:50 PM   #21
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Been having the same problem as well as partial throttle hesitation. Of course, dealer "couldn't find anything wrong".
I offered to go on the test drive and they asked me why I would need to... because I have to point out the obvious since they don't drive the 335 often.

My partial throttle problem is most noticeable in the 2k-3k rpm range. It's not a turbo lag even though a tech tried telling me that. The car just falls flat on it's face then a couple seconds later it surges.
At WOT I've had the car just not respond at all and then a few seconds later it takes off.
Maybe it's too much electronic 'thinking' in the throttle input... who knows.
But it's a recent problem and after a few software updates, fuel pump replacement and injector replacement.
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      10-26-2010, 12:58 AM   #22
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I had this same thing happen today under fairly light acceleration around 2-3K rpm. Felt like a hiccup. Only happened once, about 5 minutes after startup.
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