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Acceleration Problem

#1 escape

Group: Members
Posts: 4
Joined: 01-February 14

Posted 15 August 2014 - 03:49 PM

Hi!

I have weird problem with my 1.7 Puma. Car accelerates better when throttle pedal isn't fully pressed, when revs are 3-4k. After 4k pedal must be fully pressed again. Car won't rev over 5k, it just start juddering. OBD scanner gives fault code P0171 - System too lean. Any ideas what I should do? Change fuel filter?

Here is data from OBD software:

#2 happy-kat

Group: Admin
Posts: 21811
Joined: 10-February 03

Posted 15 August 2014 - 05:55 PM

I would check fault codes and see if reporting fault with oxygen senor. This would indicate Hego.
Is your fuel consumption up.
Is there a lot of mucky soot on your tail pipe.
Does the car sort of feels hesitant and then lurch forward. Kangaroo.

searching is fruitful | I'm a sponge not a mechanic | please do try that if stuck with a Puma problem whilst waiting for a reply | For the Puma fan this read 'The Inside Story Book' is very nice to own sometimes still seen for sale

#3 RogS500

Group: Members
Posts: 16
Joined: 09-February 13

Posted 16 August 2014 - 06:36 PM

Have the fuel pressure tested. Always a good idea to check / replace spark plugs at a early stage.

#4 escape

Group: Members
Posts: 4
Joined: 01-February 14

Posted 18 August 2014 - 02:36 PM

I have checked sparkplugs, they were ok. Fuel consumption is also good (under 7 l/100km). I think problem is MAF sensor. I cleaned MAF and car is now slightly better, it revs now over 5k and fault code disappeared. So I ordered new MAF. I will update situation after I have changed MAF.