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Hyundai 2.0 VVT 2004 - Poor performance and low mpg #

Posted by Kevin Gregory on August 3, 2011, 8:16 am

Year of Manufacture *: 2004
Engine Size and Code *: 2.0 litre vvt in trajet se auto
( Optional ) Scanner Used: launch
( Optional) Fault Codes: none

Hi

This car struggles to pull away on hills the maf reaches 4 volts the tps reads 88% but the injector duration wont go over 16ms it reaches 16ms at 2000rpm even with half throttle but will not increase temp sender is reading 88degrees i checked manifold vacumn and checked cam timing anyway all. On AD it shows 2 cam wheels for the belt, this engine only has one. New lambda has been fitted it is working fine and responding to WOT

Any ideas

Thanks Gregory

Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #

Posted by james mccallum <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat5583' width='330' height='300' border=0 style='border:none;'> on August 4, 2011, 4:38 pm, in reply to "Hyundai 2.0 VVT 2004 - Poor performance and low mpg #"
James McCallum

Hi Gregory, you got the chassis number. If it has only one cam then it cant be VVT. I dont think VVT was fitted to that age of car. Has it got Turbo, whats it like on flat, does it accelerate easily. Any other symptoms
Jim

Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #

Posted by Ian Baxter <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT1560' width='330' height='300' border=0 style='border:none;'> on August 4, 2011, 9:34 pm, in reply to "Hyundai 2.0 VVT 2004 - Poor performance and low mpg #"
Ian Baxter

Hello Kevin,
Maf At 4volts doesn't sound right! What does it look like on scope or graphing data?

Ian.

Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #

Posted by Shaun Dale <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=UKAT2719' width='330' height='300' border=0 style='border:none;'> on August 5, 2011, 9:30 pm, in reply to "Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #"

Hi Kevin,
First thoughts,blocked exhaust/collapsed cat?
Shaun

Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #

Posted by kevin gregory <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3145' width='330' height='300' border=0 style='border:none;'> on August 7, 2011, 7:22 am, in reply to "Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #"
Kevin Gregory

it isnt that bad shaun it will revout and the air flow is there if i do a wot with lambda sensor and maf on pico all looks well rich lambda and good maf.i not sure if the customer wants to spend much on it anyway.but i am interested to find the cause of the low inj duration.has anyone got one they could check to see what it should be.

Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #

Posted by james mccallum <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat5583' width='330' height='300' border=0 style='border:none;'> on August 7, 2011, 10:13 am, in reply to "Hyundai 2.0 VVT 2004 - Poor performance and low mpg #"
James McCallum

Hi Gregory,
I need a chassis number or engine code or even just the fuel system fitted. I can then try to find teh relevant info for you.
Thanks Jim

Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #

Posted by kevin gregory <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3145' width='330' height='300' border=0 style='border:none;'> on August 9, 2011, 7:05 am, in reply to "Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #"
Kevin Gregory

OK Jim i will get it today

Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #

Posted by kevin gregory <iframe src='https://members5.boardhost.com/ukautotalk4/info/user=ukat3145' width='330' height='300' border=0 style='border:none;'> on August 9, 2011, 7:51 am, in reply to "Re: Hyundai 2.0 VVT 2004 - Poor performance and low mpg #"

ch number kmhmh81br4u219661 thanks james . tested fuel presure today and it is 2.5 bar on a/d it should be 3.9bar that could explain it.

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