My car is running bad, at partial throttle the car is hesitating between 3500-4500rpm and this becomes less pronounced as the engine warms up or is under less load, so more apparent in higher gears. The car seems laggy, the turbo is not spooling until around 4000rpm and feels like its not making full boost, feels seriously underpowered and feels more like 150-170BHP and not where it should be. I've changed the whole exhaust as my downpipe was blowing, and fitted new spark plugs already and am now puzzled as to what it could be. HELP ME!

 

Is it safe to unplug my MAF sensor ie. does the car have a base line map settings - ie would it show the MAF as being faulty? or would disconnecting my MAF and trying to drive it blow up the engine ?

 

What plugs did you fit and to what gap?

 

Bosch +11's as per the Halfords listing

 

If you want sensible replies on here we need to know the following:

EXACT car and model year.
What mods are fitted to the car.
Has it ever been mapped?

 

Disconnecting the maf while the engine is running proves nothing. You need to check the maf voltages to determine if the maf is at fault.

Have you checked the engine timing? I had the same symptoms and spent a lot of cash replacing parts to find out in the end my timing was two teeth out.

 

I assume you have ruled out air leaks aswell?

As above, full spec please.

 

Hey guys!

Just found out what the issue was.... my MAF sensor was broken, there was the same Scooby - but a wagon on the car park of the business next to where I work, I popped over and asked the guy if he minded if I could "borrow" his MAF to test mine. He had a spare one in his office. I borrowed that and fitted his MAF and my car was spot on

Good times. Now got to wait for him to come back so I can see if he wants to sell it

 

Good result.

 

Awesome dude well done on getting it sorted. Just get it mapped now

 

And I've just bought the guys MAF sensor from him for £20

Duncan at RaceDynamix isn't answering his phone

 

He's probably busy mapping dude. Just drop him an email/text to arrange a mapping session. He will get back to you - may just take a couple of days if he is busy

 

Is that his full time job?

 

Yup full time occupation, that and getting his Class Winning Time Attack car sorted I think he has an event this weekend, so he may be doing work on his car. Who knows, just be patient you will get a reply.

 

Japfest this weekend I assume

 

Or Time Attack, think thats at Knockhill on Sunday

 

Yeah sorry about that, this week has been manic with work having been down in dorset for a couple of days, then liverpool and chester and then hampshire ... now back home with one day to prep mine for knockhill

I think we chatted to each other on text - just waiting for you to confirm which of those two dates are good for you