When starting car revs up and down as normal drives fine on flat up to 3000rpm then loses power
You didn't mention what sort of car you have.
You can try disconnecting the electrical lead on the MAP sensor. Then give the car a test drive.
A faulty MAP can cause high emissions, erratic running and high fuel consumption.
You can also try cleaning the EGR - the exhaust gas recycler valve.
It's strange that you have no fault codes. There is no check engine light illuminated?
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its a toyota yaris 1.4d4d 2006 and theres no engine light on had a full service on car new filters ect i was going togo to toyota to see if they can seeon there diagnostic but worried aboutcost thanks for this help
There's no need to go to a Toyota dealership. A mobile mechanic should be able to identify the problem - and they come a lot cheaper than a dealership
Try unplugging the electrical connector from air flow sensor meter and cleaning things up. If you don't know what an air flow sensor looks like do a Google search for 'Toyota Yaris Air flow sensor' or copy and paste this link into your browswer:https://www.google.co.uk/search?q=toyota...
tried the mapsensor running car without it connected also cleaned egr valvle and still no change no fault codes given could the turbo be faulty and cause the car to lose power at 3000rpm?
A turbo could cause problems, yes, but if that was the case I would imagine you would find other running problems too. I still think it's something to do with the fuel/air system.
You say the car has high emissions .. can you get the catalytic converter checked properly? The quick check you can do yourself is to smell it - any burning smell or a smell of what has been likened to 'tom cat p*ss' is indicative of a blocked/failed cat.
The only other thing that crosses my mind is a blocked fuel filter or failing fuel pump, though the symptoms you describe don't fully match a blocked filter/faulty fuel pump.
Is there anybody you know who can give you a second opinion on the 'cat'?
Here's a link that details cat symptoms:http://www.doityourself.com/stry/6-sympt...
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