Continuing Rough Idle Saga

[rmoconnor41]

No obvious change with the new VDO MAF ?

None whatsoever….

 

[rmoconnor41]

Cam position sensors would be my guess. They don't always throw codes/put EML on.

Tony.

Morning, in your opinion what brand of cam sensor would you install

 

[t-tony]

Bosch or Siemens would be my choice.

Tony

 

[rmoconnor41]

Bosch or Siemens would be my choice.

Tony

Went and fired her up this afternoon. Ran poorly. Granted she hasn’t been started since before Christmas. I would love to share the two 10 second videos I took today. Regards Richard

 

[t-tony]

Load it on YouTube (or such site), then post a link on here. The only way as it stands.

Tony.

 

[rmoconnor41]

Load it on YouTube (or such site), then post a link on here. The only way as it stands.

Tony.

- YouTube

Enjoy the videos and music that you love, upload original content and share it all with friends, family and the world on YouTube.

youtube.com

 

[rmoconnor41]

- YouTube

Enjoy the videos and music that you love, upload original content and share it all with friends, family and the world on YouTube.

youtube.com

- YouTube

Enjoy the videos and music that you love, upload original content and share it all with friends, family and the world on YouTube.

youtube.com

 

[rmoconnor41]

- YouTube

Enjoy the videos and music that you love, upload original content and share it all with friends, family and the world on YouTube.

youtube.com

- YouTube

Enjoy the videos and music that you love, upload original content and share it all with friends, family and the world on YouTube.

youtube.com

 

[rmoconnor41]

Load it on YouTube (or such site), then post a link on here. The only way as it stands.

Tony.

- YouTube

Enjoy the videos and music that you love, upload original content and share it all with friends, family and the world on YouTube.

youtube.com

 

[IanA]

Hmmmm.... per ChrisD above... still sounds like a mixture problem to me.
Takes me back to tuning twin SU carbs (remember those?).
A weak mixture would cause the engine to cough when the throttle was jabbed.
Or in my case, floored when doing 40mph on my favourite dual carriageway.
A rich mixture would cause the engine to "bog down".
With the mixture correct, the engine would pick up cleanly.

 

[colb]

Double check that you have no split or holed rubber pipes or inlet boots from Maf to throttle body. Unmetered air getting in will fool the ecu into thinking its running lean and cause more fuel to be let in at the injectors to richen it up. That fluctuating revs you are seeing can be down to air leaks. When replacing sensors always go for Bosch or Siemens oem brands. I have had success using Hass brand sensors in the past. A smoke test would be a good way to find air leaks across the engine you can't find visually.

 

[rmoconnor41]

Double check that you have no split or holed rubber pipes or inlet boots from Maf to throttle body. Unmetered air getting in will fool the ecu into thinking its running lean and cause more fuel to be let in at the injectors to richen it up. That fluctuating revs you are seeing can be down to air leaks. When replacing sensors always go for Bosch or Siemens oem brands. I have had success using Hass brand sensors in the past. A smoke test would be a good way to find air leaks across the engine you can't find visually.

Hi.
There were some issues that @AntStark and I resolved. The car was thoroughly smoke tested at the Z shed.
Some suggestions to replace cam position sensors.

 

[id101]

Have you tried the fuel filter I think it is, when trying to diagnose a weak mixture problem in mine (was a maf in the end) i did read somewhere there is some sort of vacuum pipe there that can cause problems. This is a bit of a hazy memory

 

[rmoconnor41]

Have you tried the fuel filter I think it is, when trying to diagnose a weak mixture problem in mine (was a maf in the end) i did read somewhere there is some sort of vacuum pipe there that can cause problems. This is a bit of a hazy memory

I have a filter ready to be fitted