Hi all
I’m looking for any help on the issues I’m having with my 2007 focus st.
The car under full load drops and picks up boost in waves. Also when driven slowly/normally warming it up there is hesitation going up the revs like what little boost it’s getting is still being taken away.
Please any ideas on what to do next would be greatly appreciated as already done maf sensor, boost solenoid and pressure test and coming up with no answers
cheers in advance

 

Did you tried diagnostic if any fault codes appear?

 

Hi
yes had it plugged in on Thursday it came back with knock sensors but deleted and not returned I was told they could have been triggered during being worked on previously but unsure if that’s accurate?
im having no engine management lights up etc

 

...Check one more time turbo actuator .and wg port for easy movement......

 

Sorry what is the wg port? I can have a look at the turbo actuator but is there anything to actually look for?

 

Wastegate is a valve that controls the flow of exhaust gas from an engine to the turbocharger..Actuator rod is connected to it...Maybe it is js just stuck or actuator is not properly keeping pressure due to age..Worth a try...

 

Thank you so much I will have a look and try today and let you know.
thanks again

 

Hi all
After fitting new plugs, turbo actuator and knock sensor Im still having the same problem.
I'm really at a dead end with it please any ideas would be greatly appreciated

 

Check also position of the throttle plate maybe it is fluctuating with boost pressure

 

Ok I will do that but any other ideas for me to look into? I will take out and clean the map sensor to but I’m loosing patients with replacing parts for no reason
Thanks in advance

 

Air leak or blocked air pipe somewhere maybe

 

So why not find a competent mechanic who can actually diagnose the problem, instead of making matters worse firing the parts cannon ? Which in turn can often make it even more work for them to diagnose as they then have to trawl through and find everything that has been tampered with already, as well as sorting the underlying problem

A quick websearch brings these in Plymouth ?

Wasn't there a guy who used to work at MSD who also ended up down that area too ? ( or maybe that is him )