Trevor Ashman

surging and severe knock when pulling away, the knock is intermittent

Recommended Posts

I have an intermittent surging on acceleration and the car tries to stall pulling away from standing starts. It also so has an associated knock with the pulling away aspect been to the garage but the don’t know. I have checked the air intake pipewear. I intend to clean the MAS, if this doesn’t work then change the MAS. Any more clues please

Share this post


Link to post
Share on other sites
 

Hi Trevor....welcome to the Forum

It could possibly be a vacuum leak as this causes similar symptoms.

If you carry out an exhaust gas check (any MOT approved garage should be able to carry out a Pre-MOT gas test) and look for Oxygen (O2) levels above zero which suggest a leak in the intake or exhaust.
Also, Hydrocarbons (HC) which should be very low (almost zero) which suggests that there is an ignition problem if high.

Let us know how you get on with it.

Cheers,  Trevor

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...