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VW 2.0 BDK 2008 - Jerking and smoking at light throttle - Fixed #

Posted by George Rayner on December 14, 2011, 2:41 pm

Year of Manufacture *: 2008
Engine Size and Code *: 2.0 bdk
( Optional ) Scanner Used: kts/vag com/verdict

car runs ok, tad flat but it is non-turbo,at light throttle car jerks and at 2300rpm stationary blue smokes,ok here goes i have checked valve timing , had egr valve out cleaned and checked operation,removed injectors and checked for any internal leaks,measured resistances,checked fuel pressure, found fluctuating readings around 2300 rpm,replaced pump,this is now smoother, found map sensor showing vaccum readings at 2300 rpm and throttle plate closed ???, so if i disconnect airmass/egr actuator or throttle unit, throttle defaults to fully open and car and smoke problems are ok,forgot to say i have tried a new airmass and checked exhaust for blockage,have i missed something,is there a software update ??
had loads of time with this now and have lost the plot help.thanks for reading any comments welcomed.

Re: vw golf jerking and smoking at light throttle

Posted by keith brown <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1429' width='330' height='300' border=0 style='border:none;'> on December 15, 2011, 9:41 am, in reply to "vw golf jerking and smoking at light throttle"

this engine has both cam & crank sensors ,have you got an issue with commencment of injection at speed,you also say its"flat",these are not usally noticably flat,no fault codes?,the fact that you disconnect a component & it runs default with no smoke would suggest mechanicals are good! maybe,need to scope cam & crank to prove realionship good hth keith. ps dont loose the plot just re group!
Sorry to add to that you have vag , what about injector delivey rates at the problem rpm?

Re: vw golf jerking and smoking at light throttle

Posted by George Rayner on December 15, 2011, 11:13 am, in reply to "Re: vw golf jerking and smoking at light throttle"
Message modified by board administrator December 16, 2011, 1:21 pm

thanks keith,yer i have checked delivery rates,not yet done a cam to crank sync,just going to recheck timing but this time remove cam and crank pulleys to make sure they are correct??
as you will know cam and crank pulleys pin up,but that doesnt mean that something else hasnt moved,that was my regrouped thought last night 9 pm.here goes round3 ! any other thoughts,data reference welcomed, cheers george.

Re: vw golf jerking and smoking at light throttle

Posted by sean savage <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT5559' width='330' height='300' border=0 style='border:none;'> on December 15, 2011, 12:17 pm, in reply to "Re: vw golf jerking and smoking at light throttle"

throttle body clean and reset adaptions?
forget that. just seen its a diesel!! roll on holiday time

Re: vw golf jerking and smoking at light throttle

Posted by mark Carter <iframe src='https://members.boardhost.com/ukautotalk8/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on December 15, 2011, 2:36 pm, in reply to "Re: vw golf jerking and smoking at light throttle"

Hi,

Can you carry out any quantity comparison tests using the diagnostic equipment?

Figure is the base injection quantity reading?

Mark

Modern cars, Its all wizardry and witchcraft

Re: vw golf jerking and smoking at light throttle

Posted by George Rayner on December 15, 2011, 4:22 pm, in reply to "Re: vw golf jerking and smoking at light throttle"
Message modified by board administrator December 16, 2011, 1:21 pm

can do and will post them today,thanks

Re: vw golf jerking and smoking at light throttle

Posted by George Rayner on December 15, 2011, 6:22 pm, in reply to "Re: vw golf jerking and smoking at light throttle"
Message modified by board administrator December 16, 2011, 1:21 pm

6mg warm idle(mm3)
NO VARIATION IN EACH INJECTOR.

Fixed #

Posted by George Rayner on December 15, 2011, 9:06 pm, in reply to "vw golf jerking and smoking at light throttle"
Message modified by board administrator December 21, 2011, 2:49 pm

OK GOT A LITTLE BIT FED UP WITH THIS ONE,CAR FROM A GOOD LOCAL CAR SALES, THEY WANT IT RIGHT FOR THEIR CUSTOMER BUT ALSO DID NOT WANT IT TO CAUSE ME TOO MUCH BOTHER AND THEM TOO MUCH COST,
SO THE ISSUE SEEMED TO ME THAT THROTTLE PLATE OPENED TOO LATE WHICH CAUSED INTAKE TO PULL VACCUM AND NOT ALLOW AIRMASS TO READ CORRECTLY FOR GIVEN PEDAL POSITION, O I HAVE REMOVED THROTTLE PLATE AND CUT IT IN HALF, TRIED DRILLING SMALL HOLE FIRST, BUT THIS HAS NOW ALLOWED AIRMASS READINGS TO INCREASE AND HAS ALLOWED INTAKE NOT TO VACCUM SO MAP/BOOST SENSOR READS CORRECTLY,CAR DRIVES GREAT NO FAULT CODES YET AND SHUTS OFF OK, STILL DO NOT KNOW WHAT THE REAL FAULT IS/WAS BUT ITS KEPT ME LATE FOR A WEEK + !!! PLEASE COME BACK TO THIS TO POST IF ANYONE KNOWS MORE OR HAS HAD/GOT SAME AND FOUND REAL FIX,I COULD GET IT BACK, HAVE A SPARE BUTTERFLY PLATE.

Fixed #

Posted by Jon Morgan on December 20, 2011, 10:12 pm, in reply to "Re: vw golf jerking and smoking at light throttle FIXED ISH"
Message modified by board administrator December 21, 2011, 2:49 pm

Possible stripped gear in manifold flap motor housing, gears jumped - placing the manifold flap in the wrong position.

Fixed #

Posted by George Rayner on December 21, 2011, 8:25 am, in reply to "Re: vw golf jerking and smoking at light throttle FIXED ISH"
Message modified by board administrator December 21, 2011, 2:50 pm

Hi

May be, but i did take it apart and checked all that, although cars gone and ok i would like to know.

Thanks anyway

George

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