Engine shaking when start, car rpm jumping up & down

[aidilj]

I still dont get it. he he. It has nothing to do with the sudden gear drop (RPM) from 3rd gear to 2nd gear as you slow down?

Bro, the previous reply is for Bro azel jumping up and down rev problem. Not sure about your problem.

bro,
can O2 sensor cause smoke to come out. I am currently having this problem. i noticed some kind of irritating smell from the exaust and if i drive or in a commute for a some time smoke starts to come out like a chimney..smoke disappear after a decent acceleration.

Bro, irritating smell could be you are running rich, cat still there? Not sure about the smoke, what I can say plug your diagnostic machine and see if there is any error or bring the car to a trusted mechanic.

 

[azeL_Inc]

Did u check your throttle body and idle valve sensor and clean them.? Check intake hose and all vacuum . Maybe one of it is the caused. Me still learning the symptoms also :smokin:

thanks bro, but it has been solved by replacing the "rubber boot with resonance" and MAF cleaning, as explained in my later posts :top:

 

[SBB]

Hi All,
I m facing the same issues where at times rpm unstable & seems under power. When to Albert in Pandan and dignose fr computer as per attachedView attachment 29953
It is said either the last 2 which coz it but system shows " faulty currently not present" so, for now he reset and seems back to norm but not for long as later loss of power. He said jalan dulu coz not really which one is really faulty to change, as afraid that might change the wrong one.

Question:
1. which one to attent to or change?
2. How much to coz tge O2 sensor and camshaft control inlet cost?

Appreciate if anyone can feedback.
Thanks

 

[aidilj]

Hi All,
I m facing the same issues where at times rpm unstable & seems under power. When to Albert in Pandan and dignose fr computer as per attachedView attachment 29953
It is said either the last 2 which coz it but system shows " faulty currently not present" so, for now he reset and seems back to norm but not for long as later loss of power. He said jalan dulu coz not really which one is really faulty to change, as afraid that might change the wrong one.

Question:
1. which one to attent to or change?
2. How much to coz tge O2 sensor and camshaft control inlet cost?

Appreciate if anyone can feedback.
Thanks

Bro SBB,

Since the symptom repeats iteself after reset, have the car diagnosed again eithrr at workshop or any friends that have a diagnostic machine. Fix the reoccuring one.

the cam sensor is around rm250. not sure about the wideband o2 sensor.

cheers

 

[huskar3399]

Hi All,
I m facing the same issues where at times rpm unstable & seems under power. When to Albert in Pandan and dignose fr computer as per attachedView attachment 29953
It is said either the last 2 which coz it but system shows " faulty currently not present" so, for now he reset and seems back to norm but not for long as later loss of power. He said jalan dulu coz not really which one is really faulty to change, as afraid that might change the wrong one.

Question:
1. which one to attent to or change?
2. How much to coz tge O2 sensor and camshaft control inlet cost?

Appreciate if anyone can feedback.
Thanks

bro you can always get the price by calling any bmw part shop. one of them is BA 03 40433888. good luck.

 

[Helena320]

if the idling speed is stable when the maf is disconnect during cold start, then the problem lies with the maf.

you can try to clean the maf with crc maf cleaner before changing to new one.

I read somewhere electronic cleaner also can use..cant find this maf cleaner here in KK..

 

[jarance]

I read somewhere electronic cleaner also can use..cant find this maf cleaner here in KK..

Yes, it can be used as well. We call it Contact Cleaner.

 

[Helena320]

Yes, it can be used as well. We call it Contact Cleaner.

another question sifu. did we juz spray the cleaner to the tiny metal inside the maf? my rpm will drop to 500 sometimes lower during start up..but steady aje if disconnect the maf.

 

[huskar3399]

another question sifu. did we juz spray the cleaner to the tiny metal inside the maf? my rpm will drop to 500 sometimes lower during start up..but steady aje if disconnect the maf.

last time i used cotton bud and crc cleaner to clean the metal sensor. the mesh at one of the side can be disassembled to ease access to the metal sensor inside.

 

[jarance]

another question sifu. did we juz spray the cleaner to the tiny metal inside the maf? my rpm will drop to 500 sometimes lower during start up..but steady aje if disconnect the maf.

Yeah, just spray the tiny metal inside the MAF.

I think you should also check the ICV and DISA as well as the MAF reading is bypass during cold start.

 

[jarance]

last time i used cotton bud and crc cleaner to clean the metal sensor. the mesh at one of the side can be disassembled to ease access to the metal sensor inside.

Not recommend as you might break the wire strip if your hand is not steady while cleaning with cotton bud.

The CRC spray clean should be enough.

 

[Helena320]

last time i used cotton bud and crc cleaner to clean the metal sensor. the mesh at one of the side can be disassembled to ease access to the metal sensor inside.

didnt hv faith in my hand. everyday curling dumbell..cannot handle fragile object..haha

 

[Helena320]

Yeah, just spray the tiny metal inside the MAF.

I think you should also check the ICV and DISA as well as the MAF reading is bypass during cold start.

thanks.. will try to clean the maf first..

 

[jarance]

thanks.. will try to clean the maf first..

Just do this.

 

[SBB]

All,

I ve sent my car (318i 2.0 2004 local) to dignose in Pandan where my relaiable mechanic (Pandan) and revealed as follows:-

1. It was mentioned that the camshaft control inlet is not the problem though in dignosis tect schedule show - "Open circuit-Faulty currently present."
as he said that by swaping the ECU with his spare, the problem solved....I did test felt bit better... but still not satisfay engine indicator flash up using his swap ECU.

2. He propose change ECU together with the EWS (situated under the steering act as a relay) and ignition (inc key)

3. The car need to instal an air-pump to the exhause since my model do not have one. All together there are 4 itme and to cost RM2K +++ (Aduiii)

Am skeptical on this........and thing of getting second opinion at other workshop...

Need some comments pls if any of you guys have encounter the similar issues.

 

[huskar3399]

All,

I ve sent my car (318i 2.0 2004 local) to dignose in Pandan where my relaiable mechanic (Pandan) and revealed as follows:-

1. It was mentioned that the camshaft control inlet is not the problem though in dignosis tect schedule show - "Open circuit-Faulty currently present."
as he said that by swaping the ECU with his spare, the problem solved....I did test felt bit better... but still not satisfay engine indicator flash up using his swap ECU.

2. He propose change ECU together with the EWS (situated under the steering act as a relay) and ignition (inc key)

3. The car need to instal an air-pump to the exhause since my model do not have one. All together there are 4 itme and to cost RM2K +++ (Aduiii)

Am skeptical on this........and thing of getting second opinion at other workshop...

Need some comments pls if any of you guys have encounter the similar issues.

i don't think the ecu (i guess u are referring to the dme) has anything to do with this issue. and the ews, it is car immobilization system modul. i just don't quite get how can they be related to underpower issue. i would recommend you to at least get your car scanned by a friend and get their opinions instead of merely trust the mechanic. no offence to any workshop but they are not always correct. in the end it's your money bro. use it wisely.

 

[aidilj]

All,

I ve sent my car (318i 2.0 2004 local) to dignose in Pandan where my relaiable mechanic (Pandan) and revealed as follows:-

1. It was mentioned that the camshaft control inlet is not the problem though in dignosis tect schedule show - "Open circuit-Faulty currently present."
as he said that by swaping the ECU with his spare, the problem solved....I did test felt bit better... but still not satisfay engine indicator flash up using his swap ECU.

2. He propose change ECU together with the EWS (situated under the steering act as a relay) and ignition (inc key)

3. The car need to instal an air-pump to the exhause since my model do not have one. All together there are 4 itme and to cost RM2K +++ (Aduiii)

Am skeptical on this........and thing of getting second opinion at other workshop...

Need some comments pls if any of you guys have encounter the similar issues.

i don't think the ecu (i guess u are referring to the dme) has anything to do with this issue. and the ews, it is car immobilization system modul. i just don't quite get how can they be related to underpower issue. i would recommend you to at least get your car scanned by a friend and get their opinions instead of merely trust the mechanic. no offence to any workshop but they are not always correct. in the end it's your money bro. use it wisely.

Bro SBB and huskar,

1. The error is for the Vanos solenoid or position sensor? How did he conclude that DME is broken? You mention a bit better, does it mean back to normal?

2. DME and EWS come as a pair when used

3. Is it this item?

I've just removed mine and plugged the hole

 

[huskar3399]

Bro SBB and huskar,

1. The error is for the Vanos solenoid or position sensor? How did he conclude that DME is broken? You mention a bit better, does it mean back to normal?

2. DME and EWS come as a pair when used

3. Is it this item?

thanks for the informative post bro. but what's the function of the air pump as per no 3? and there u removed it for good. any reason why? i don't think my car has the same.

 

[Helena320]

Bro SBB and huskar,

1. The error is for the Vanos solenoid or position sensor? How did he conclude that DME is broken? You mention a bit better, does it mean back to normal?

2. DME and EWS come as a pair when used

3. Is it this item?

I've just removed mine and plugged the hole

have u do a write up for this modification?

thanks for the informative post bro. but what's the function of the air pump as per no 3? and there u removed it for good. any reason why? i don't think my car has the same.

urs is M54? M54 engine didnt have this pump if not mistaken..the function is for emission control btw.

 

[aidilj]

thanks for the informative post bro. but what's the function of the air pump as per no 3? and there u removed it for good. any reason why? i don't think my car has the same.

have u do a write up for this modification?

urs is M54? M54 engine didnt have this pump if not mistaken..the function is for emission control btw.

Bros, yes M54 has this as well and there are a few different designs for the system. And some cars with different emission requirement are not equipped with it.

Look at this doc, page 37 to read more about how it works : http://www.ge39.com/files/m54x5.pdf

I'm supposed to publish the write up about all the mods so far but yet, for this one just remove everything and plug the hole.