Car jerk in accelaration at 2000-3000rpm.

[jarance]

Firz, it is very unlikely the fuel pump. What is your mileage clock?

Based on experience, pump usually failed about 100,000 KM.

How come your GB need 7 solenoids. Your 6 speed?

 

[FIRZ67]

Firz, it is very unlikely the fuel pump. What is your mileage clock?

Based on experience, pump usually failed about 100,000 KM.

How come your GB need 7 solenoids. Your 6 speed?

Yup. Mine is 6HP19 ZF 6 speeder.Brought my car for a check today and suspect could be the failure of ignition coils. But need to do a check again on Monday to confirm this.

 

[fadzli 325i]

I have experienced the same problem on my E90 320 N46 early this year.It shudder/jerk at 1500-2000 rpm between 20-40kmh speed.Car feels struggling to build up speed at this rpm range.Above that, car can be driven as normal and the gear shift is rather smooth.Firstly suspect cause by low ATF level since got my ATF heat exchanger leaked. After change the ATF heat exchanger, the problem still persist. Went for a GB diagnose at Mscope Bt Caves, found out solenoid failure. Service the valve body (Mechatronic) and changed all 7 pieces of solenoids.After few programming sessions, the problem hidden for a while. Now it came back and I don't know whether it is related to GB issues or engine.Now i am trying to recall whether the problem started when I changed the ignition coils and spark plug. Could it be a wrong spark plug or as what Jarance said I should check the fuel pump.

Hi,

This is the same prob that happend to me. 1500-2000 rpm between 20-40kmh speed. Until now dont know what the problem. Jarance advise that the fuel pump/ fuel filter maybe the problem.

 

[fadzli 325i]

Not yet perform the test #9, been busy with family members wedding last week.
Will update when i did the test #9.

Firz67,
Do you feels like the car losing power?
When the jerk happend, Can you hear sounds, like lot of air rushing out from your exhaust? it Went back normal when the rpm more then 2000rpm.

 

[FIRZ67]

Not yet perform the test #9, been busy with family members wedding last week.
Will update when i did the test #9.

Firz67,
Do you feels like the car losing power?
When the jerk happend, Can you hear sounds, like lot of air rushing out from your exhaust? it Went back normal when the rpm more then 2000rpm.

Nope. When this happen, car will shudder until u reach higher speed.but the power is still there. No sound from the exhaust.

 

[jarance]

Guys, both of you have different model. One of you is E46/325i and the other is E90/320i lar.

Different car different character lar..

 

[FIRZ67]

Yup. True jarance. Not comparing apple to apple. But weird thing is all those symptoms disappeared when driving in heavy rain. Dunno what's to relate with.

 

[jarance]

Yup. True jarance. Not comparing apple to apple. But weird thing is all those symptoms disappeared when driving in heavy rain. Dunno what's to relate with.

mmm... cold air intake? If the intake air temperature is lower and your problem disappear, maybe you should considered your air filter and your MAF first.

 

[Fireuz]

After read the replies for the others and Jarrance, I realize that I had the same symptoms too, but only in the morning time during warming up the engine (RPM up and down at certain temp).

No jerking but I can feel the power lil bit loosing when on speeding (160-200kmh).

I went to Optimum Kayu Ara for car medical check up, he said that my radiator system (cooling system) is not in proper working condition than it should be. Honestly, I never thought it was the problem, but that is what the mechanic told me. Maybe he's correct but until now I'm not decide yet to fix it, since they quote me RM2k++ for that. :smokin:

 

[jarance]

After read the replies for the others and Jarrance, I realize that I had the same symptoms too, but only in the morning time during warming up the engine (RPM up and down at certain temp).

No jerking but I can feel the power lil bit loosing when on speeding (160-200kmh).

I went to Optimum Kayu Ara for car medical check up, he said that my radiator system (cooling system) is not in proper working condition than it should be. Honestly, I never thought it was the problem, but that is what the mechanic told me. Maybe he's correct but until now I'm not decide yet to fix it, since they quote me RM2k++ for that. :smokin:

Your problem is totally different. They have power lack at low rpm at first/second gear but no eractic rpm.

Eractic RPM during warming up could be due to MAF problem.
Slight Lack of power at high speed / high RPM could be due to many thing. Not sure it could be due to the cooling system but dirty MAF could be one of the cause. Others are fuel filter, spark plug, ignition coils, leaking vacuum hoses, weak fuel pump, faulty fuel regulator, worn out vanos.

What is your temperature indication? Half mark or slightly higher. btw, what model is your ride and mileage clocked?

For 2K, what is the thing that they are going to changed?
Radiator, water pump, thermostats, water hoses included ????

 

[Fireuz]

Your problem is totally different. They have power lack at low rpm at first/second gear but no eractic rpm.

Eractic RPM during warming up could be due to MAF problem.
Slight Lack of power at high speed / high RPM could be due to many thing. Not sure it could be due to the cooling system but dirty MAF could be one of the cause. Others are fuel filter, spark plug, ignition coils, leaking vacuum hoses, weak fuel pump, faulty fuel regulator, worn out vanos.

What is your temperature indication? Half mark or slightly higher. btw, what model is your ride and mileage clocked?

For 2K, what is the thing that they are going to changed?
Radiator, water pump, thermostats, water hoses included ????

Thanks Jarrance for the explanation. I'm driving 328i E46 with 136k km mileage clock. Based on what the mechanic says, they going to change all parts of the cooling system except for the radiator, cause I'm just changed it last 6 months. Nothing abnormal on my temperature indicator (it's half mark), and this is why I'm still drive the car without worry.

 

[jarance]

Thanks Jarrance for the explanation. I'm driving 328i E46 with 136k km mileage clock. Based on what the mechanic says, they going to change all parts of the cooling system except for the radiator, cause I'm just changed it last 6 months. Nothing abnormal on my temperature indicator (it's half mark), and this is why I'm still drive the car without worry.

Hold the cooling work for the time being as your temp mark is half way only. This is a clear indication that your cooling system is in order.

Do consider to change the ATF oil and filter for the GB since your mileage is about 136K KM.

Are U using Ron 95 or Ron 97 petrol. change to Ron 97 if you are presently using Ron 95.

 

[Fireuz]

I'm changed the ATF and filter for my GB at mileage clock of 100k last time. When is the next time it should be done?

P/S: Sorry to Tuan Tanah cause interrupt your thread :wink:

 

[jarance]

I'm changed the ATF and filter for my GB at mileage clock of 100k last time. When is the next time it should be done?

P/S: Sorry to Tuan Tanah cause interrupt your thread :wink:

some say 40K, some say 60K, some say 80K. Nothing is etched in stone. :smokin:

you drive the car everyday. You should be best person to judge. :wink:

 

[Ade]

Similar problem on my e46 325i. If I stick the car to third gear and accelerate from 2000rpm, rpm will drop for a moment around 2800rpm before continuing smoothly over 3000rpm. During that time, can see the power is suddenly missing. This only happens in 3rd gear. No fault codes watsoever. Checked everything from fuel filter to ignition coils to vanos seals. Mechanic says its the torque converter and will have to change. Known issue in e46 gearboxes it seems according to my mech. Any thoughts?

 

[fadzli 325i]

Just change the fuel filter, checking the fuel pump cond (OK) no need to replace.
but the problem still exist.

 

[FIRZ67]

Brought my car for a check. Most possible cause is Gearbox.Even tried to change the air filter but problem still persist.Need to bring back to Mscope for check up.

 

[littlecolossus]

Similar problem on my e46 325i. If I stick the car to third gear and accelerate from 2000rpm, rpm will drop for a moment around 2800rpm before continuing smoothly over 3000rpm. During that time, can see the power is suddenly missing. This only happens in 3rd gear. No fault codes watsoever. Checked everything from fuel filter to ignition coils to vanos seals. Mechanic says its the torque converter and will have to change. Known issue in e46 gearboxes it seems according to my mech. Any thoughts?

Hi...

It is a common understanding in international forums that this is a torque converter issue.

Previously it happened to my 328i and got exhaust cam sensor code, changed and all good. After a while it came back with even less power, change intake cam sensor and power is back, but this issue remains. Main forum points out torque converter, as it does also make sense. Plus, at very high RPMS, eg high acceleration and high speed at gear 5, it kinda judder a little with minor power loss. Check the Torq Converter out, maybe oil tak cukup, maybe even more sinister. I haven't yet, anyone done it, please post your results for all to see.

I will do it in my next service, if got budget larr. Either way it would cost more money, but I am still glad I am driving it.

By the way, RON95 is ok for BMW... it can run on RON91-98 only. While maintaining AKI of min 89. Usually MON is -10 of RON, thus RON95 makes it 90 AKI. Nothing to do with power whatsoever. Unless of course you need the RON97 due to excessive compression ratio, which our Bimmer do not have (stock).

I wonder how much it would cost to change the torque converter, as I am seriously thinking of changing it.

 

[littlecolossus]

Ade, what do your mech say it would cost to change the torq converter?

 

[Alex5522]

Hi...

It is a common understanding in international forums that this is a torque converter issue

I wonder how much it would cost to change the torque converter, as I am seriously thinking of changing it.

Bro

U can try to find out the answer with BA or others place which selling BMW parts .