BMW E90 no compression

[garrethwessels]

i have a BMW E90 320i, car has about 240 000km on the clock, car was smoking when the vehicle was standing idle, grey smoke on pull off. i sent the vehicle in and they removed the head and had the head redone , acid bath, new valve stem seals,  engine is reassembled.  now when the car is started there is no compression, but if you turn the car over manually is builds compression very quick, try start it after that and loosing all compression,  car drove in to the workshop. all old oil and sludge has been cleaned, the head has been sent back to for testing and passed. the car has been reset with the computer , any ideas

 

[TurboLlew]

Is there no compression on a specific cylinder or on all cylinders?

You're building compression on all your cylinders until you start the car?

 

[Camnefdt]

What does it do that you know its losing all compression? Are you measuring it? Or just by sound?

 

[garrethwessels]

What does it do that you know its losing all compression? Are you measuring it? Or just by sound?

So if you manually turn the engine over it was build compression quickly. If you start the car with the key it will loose all compression. All cylinders. You can hear by ear there is no compression

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Is there no compression on a specific cylinder or on all cylinders?

You're building compression on all your cylinders until you start the car?

Manually there is compression. As soon as you start the car with the key. First cycle you can hear it still has compression. And second cycle it's gone. And it will just keep cranking with no compression

 

[Nikhil]

Sounds like valvetronic to me

 

[garrethwessels]

Sounds like valvetronic to me

Busy replacing it quick

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Sounds like valvetronic to me

Busy replacing it quick

Replaceed the valvetronic. Did the adaption. Still no compression

 

[Camnefdt]

Don't go by sound only, get it tested. What your 'hearing' could be very different from whats actually happening

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If there's no compression at all while cranking, check your timing. If it's just low, make sure your torqued the head down correctly.

You can also make sure that you arent getting compression into your cooling system or sump.

 

[individj]

was also thinking timing

 

[garrethwessels]

was also thinking timing

timing  is done, it builds compression when manually cranked,  if timing was out it would never build compression

 

[individj]

well no it could have compression depending on how much its out

 

[MGO_BMW]

try checking your vanos.

I am not sure but it is worth a shot also what does the diagnostics say ?

 

[Camnefdt]

was also thinking timing

timing  is done, it builds compression when manually cranked,  if timing was out it would never build compression

stop making assumptions and test properly.

There's other factors that could create the feel of compression when turning by hand and equally as many that cause the 'sound' of no compression. Even low compression would make it sound like there is no compression.

No compression means something is very very wrong somewhere.
low compression means something is not sealing when it is suppose to.

where about are you? where is the car?

 

[MGO_BMW]

thats why i am saying since the vanos activates when turning the car via your normal starting opperation ...... and yes no compresson means something serious wrong somewhere and low compression is a leak somewhere.

Take it to a reputable mech/shop and let them have a look.... i am no expert just trying to help a guy out.

 

[Camnefdt]

thats why i am saying since the vanos activates when turning the car via your normal starting opperation ...... and yes no compresson means something serious wrong somewhere and low compression is a leak somewhere.

Take it to a reputable mech/shop and let them have a look.... i am no expert just trying to help a guy out.

Qppologies if it wasn't clear, my reply was to OP :smilebounce:

Hes just assuming an issue without valid testing. That type of fixing is what causes mechanics to chase their tales and never truly find issues. Simple tests like a compression test will tell you straight away what to stary looking at next.

 

[garrethwessels]

was also thinking timing

timing  is done, it builds compression when manually cranked,  if timing was out it would never build compression

stop making assumptions and test properly.

There's other factors that could create the feel of compression when turning by hand and equally as many that cause the 'sound' of no compression. Even low compression would make it sound like there is no compression.

No compression means something is very very wrong somewhere.
low compression means something is not sealing when it is suppose to.

where about are you? where is the car?


Car is at my with the repair shop. Jag auto tech. The car drove into the workshop. They took the head off and sent it in. They did a full clean and valve stem seal replacement. Put the head back on. Brand new gasket kit. I have tested and replaced the valvetronic. It's working. Car just won't build compression. 

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thats why i am saying since the vanos activates when turning the car via your normal starting opperation ...... and yes no compresson means something serious wrong somewhere and low compression is a leak somewhere.

Take it to a reputable mech/shop and let them have a look.... i am no expert just trying to help a guy out.

Qppologies if it wasn't clear, my reply was to OP :smilebounce:

Hes just assuming an issue without valid testing. That type of fixing is what causes mechanics to chase their tales and never truly find issues. Simple tests like a compression test will tell you straight away what to stary looking at next.

Car drove in to the work shop. It's only since the head was redone. And the head was done by a company that was pressure tested it 3 times.

 

[Camnefdt]

was also thinking timing

timing  is done, it builds compression when manually cranked,  if timing was out it would never build compression

stop making assumptions and test properly.

There's other factors that could create the feel of compression when turning by hand and equally as many that cause the 'sound' of no compression. Even low compression would make it sound like there is no compression.

No compression means something is very very wrong somewhere.
low compression means something is not sealing when it is suppose to.

where about are you? where is the car?


Car is at my with the repair shop. Jag auto tech. The car drove into the workshop. They took the head off and sent it in. They did a full clean and valve stem seal replacement. Put the head back on. Brand new gasket kit. I have tested and replaced the valvetronic. It's working. Car just won't build compression. 

---

thats why i am saying since the vanos activates when turning the car via your normal starting opperation ...... and yes no compresson means something serious wrong somewhere and low compression is a leak somewhere.

Take it to a reputable mech/shop and let them have a look.... i am no expert just trying to help a guy out.

Qppologies if it wasn't clear, my reply was to OP :smilebounce:

Hes just assuming an issue without valid testing. That type of fixing is what causes mechanics to chase their tales and never truly find issues. Simple tests like a compression test will tell you straight away what to stary looking at next.

Car drove in to the work shop. It's only since the head was redone. And the head was done by a company that was pressure tested it 3 times.

---

I have sent you a PM, drop me a whatsapp and ill help you as much as i can. there are some tricks to testing to give you an idea of whats going on.

 

[garrethwessels]

was also thinking timing

timing  is done, it builds compression when manually cranked,  if timing was out it would never build compression

stop making assumptions and test properly.

There's other factors that could create the feel of compression when turning by hand and equally as many that cause the 'sound' of no compression. Even low compression would make it sound like there is no compression.

No compression means something is very very wrong somewhere.
low compression means something is not sealing when it is suppose to.

where about are you? where is the car?


Car is at my with the repair shop. Jag auto tech. The car drove into the workshop. They took the head off and sent it in. They did a full clean and valve stem seal replacement. Put the head back on. Brand new gasket kit. I have tested and replaced the valvetronic. It's working. Car just won't build compression. 

---

thats why i am saying since the vanos activates when turning the car via your normal starting opperation ...... and yes no compresson means something serious wrong somewhere and low compression is a leak somewhere.

Take it to a reputable mech/shop and let them have a look.... i am no expert just trying to help a guy out.

Qppologies if it wasn't clear, my reply was to OP :smilebounce:

Hes just assuming an issue without valid testing. That type of fixing is what causes mechanics to chase their tales and never truly find issues. Simple tests like a compression test will tell you straight away what to stary looking at next.

Car drove in to the work shop. It's only since the head was redone. And the head was done by a company that was pressure tested it 3 times.

---

I have sent you a PM, drop me a whatsapp and ill help you as much as i can. there are some tricks to testing to give you an idea of whats going on.

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no PM

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try checking your vanos.

I am not sure but it is worth a shot also what does the diagnostics say ?

i have replaced both vanos, about 10k km ago