okay im about ready to sell my car ive had this problem for a long while..when i cold start and move away the car bucks/kangeroos badly, it only gets jumpy on the on/off of the throttle i.e if i raced away it would be okay..trouble i have to tootle around the estate with no/little throttle..the problem has gone after say 2 mins driving car starts on the button eveytime it will idle from cold start fine..only when i touch the throttle to move away will it kangeroo...just like if you need more choke on a carb engine forum memeber gti has kindly talked me through setting the wur and control pressure and while it drive better when warm it has improved the cold driving issue any sensible suggestions please
you say you had trouble when warm before, was it similar like described here: http://www.clubgti.com/forum/forum_posts.asp?TID=69932&P N=3?
It must be down to pressure on cold starts? I take it your Sensor flap is Spot on? your TP switch is working fine? You say you've tested the pressures correctly? Have you tried carb cleaning the airflap and throttle body? If so does it make it abit better?
its all good as far as i can tell, what differance does flap height make? i wondered if its sticky, but its deffo realted to engine heat
Flap height makes alot of difference it has to be set pretty much perfect so alittle amount of vacuum can lift it. Have you checked the vacuum hose at the back of the inlet manifold? I found that to be split on mine causing BAD running when cold. Just read, this a 16v? If its heat, maybe the WUR isn't working right? Have you tried a known working other? Pumps all ok? New filter?
well stealth set the flap..and it looks okay , its just under the ridge as per the manual it seems like the fuel cant respond quick enough for those first few moments, btw if i rev its nuts of it remains the same recent lift pump and filter..main pump sounds normal and the control pressure was a little high so its doing its job i have tried a wur that i purchased new a few yrs back..no change, if anyone has a known good one they can lend me speak up
I seem to recall someone on here saying they'de lend you one? Your injectors ok? Or mad as this may sound, your plugs ok?
it seems we have similar although different problems... I got answer for mine on some other forum that it could be water temperature sensor that sends water temp. to computer. perhaps you could try that, they aren't expensive
sounds like the same problem as mine. it starts fine, idle's fine, but when cold and you try and set off it kangaroo's and seems to miss fire, but as soon as the oil temperature goes above 70 its fine. its weired, because it seems to have gone away now and i havn't done anything to it ) but i think thats because its warm at the moment, usualy does it when there's a bit of damp in the Air, this is what i have checked on mine and it still does it: 3 sensors on the side of the head, wiring for 3 sensors on the side of the head, air flow meter and throttle body inlet air leaks isv & switch on side of the tb new coil this is what i've got left to try: HT leads spark plugs dizzy cap/rotor arm that weired vacume thing on the back of the air box(any idea's) the other weired thing that looks like a space ship on the side of the air box 5th injector thing on the side of the inlet manifold the big brown water sensor on the side of the head(two pin connection) the WUR if its none of that, its going off the humber bridge [:^(]
steve, i can't help thinking its the wur mate! if you can do the 'warm up period' pressure tests we talked about this weekend then let me know and i'll do mine too, for comparison. another thought is to check the vacuum feed to the ecu. Edited by: GTI
When mine starts being a pig i find carb cleaner seems to sort it out. Squirt a load in the airbox when its running and seems to clear everything through. Just as a little thread hijack while all the k-jet experts are here......... mine is a right pig to start if warm and parked facing up a hill! Any ideas?? Fine if parked the other way round Edited by: ^neo^
Have you checked that the fifth injector fires when you put your foot down? The vacuum pressure switch (spaceship thingy ) adds extra fuel into the mix via the fifth injector during warm up. Have you tried swapping the WUR for another one. The bimetallic spring may be dead or you aren't getting current to it.
Fuel Accumulator? When the cars warm the heat evaporates the fuel in the lines then next time you try and start it, its got less pressure in the system and is a pain to start? Or wur?
Hmmmmmmmm , noted..... i'll check em out ! The accumulator is new........ well new to me, wasnt gonna give VAG 140 for one !
they';re 80 quid on gsfs site if that is the problem, but thinking about it, it'de do it all the time cause when you left it after a run and left it till the next day it'd still do it.
i love you i will give it a test tonight, should the fifth injector fire at low revs with the throtle fully open? The vacuum pressure switch (space ship thingy) is at the back of the air box yeah? just making sure were talking about the same spaceship thingy, cos there's loads of space ship thingy in my engine bay Edited by: bigfatpixey
