Hi I have a Volvo s40 2008 Iately after cranking, it has a sluggish idle and requires me to rev it before it idlea correctly, I have given a full service and even changed the fuel pressure sensor, but still no chnage.

Any help will be highly appreciated

 

Only about a million possibilities. You could start replacing part$$$$$ - but it's better if you scan the car for codes to see if it's trying to save you time and money by telling you where the problem is.

 

Thank you for your respond, but I have already sscanned it and there no codes that it gives, I am really out of ideas

 

Start with the usual suspects - new (quality brand from a trusted source) spark plugs, gapped properly, clean MAF and MAP sensors, look for vacuum leaks (maybe listen a telltale hiss with a hose as a stethoscope). Check the condition of the air filter.

Look up info on testing /.checking the PCV system.

Maybe clean the throttle body (could be gunked up).

I only left about 900,000 possibilities. ;-)

 

I have done it all, but still the issue persists

 

have you checked fuel pressure with a gauge? low fuel pressure may be the pump or filter - not just the sensor. Have you checked compression? do you have access to a fully featured scanner that can monitor real time data?

 

Interesting that this guy seems to be posting only snippets from previous postings verbatim.

 

They also add numerous links to the end and eventually edit them out. Terrible advertising bot.

 

As an option, you can report as spam any posts that contain blind links and the moderators can review/edit/delete and warn or suspend any offenders if need be.

 

Bad CEM