car bucks when coasting up to lights etc

[malcolm]

Another vote for a vacuum leak. I have this sort of thing in a carburettor car where there is a leak between the carb and manifold. Not sure how that would translate into injected and supercharged etc

 

[dannyp]

folloow the usall difigifant recipie

check the engine cooloant sensor with multimeter to make sure it's reading about right.
replace vaccume pipe to ecu , it should be 1 meter long
clean out the ISV and throttel body.
check the throttel position switches actualy work

should find somethign amis theer ethat'll fix it

 

[normspanners]

yes i need to figure out a way of pressurising the system ...need a suitable bung with a bolt in valve

Apiece of exhaust pipe with a repair washer welded on I have used a plastic cap off a 20ltr tub when 'in the field' , as regards a valve all you need is a 1/2" hole then pull a valve from a tyre into it then you just use a standard tyre inflater .
but the main thing is you need a 'swage' on the OD of the bung for the clip to shoulder behind, coz it WILL blow out without it.

 

[steveo3002]

yeah will have to measure the dia i need , prob bigger than most exhuahst pipes

 

[normspanners]

prob bigger than most exhuahst pipes

!!! I've got a bit of 4" exhaust here, you can have!
Just go to tyre exhaust place you will get the valve and summat there, a fancy tail pipe etc.?

 

[CompoSimmonite]

I had a 1.8 mkII Golf with similar problem. Turned out carb is mounted on a rubber plate that splits so allowed air in when turning sharp and braking / hard acceleration.
Now I know your vehicle is different with being supercharged and injection but is there a similar rubber mounting anywhere in the intake pipework etc that could be doing the same ?

Paul h

 

[normspanners]

I think the problem is, it sounds like a GOLF!
its got problems like a GOLF, so it just must be a GOLF!!!.

 

[normspanners]

BIG SORRY I 'read' turbocharged NOT SUPERCHARGED.

 

[steveo3002]

!!! I've got a bit of 4" exhaust here, you can have!
Just go to tyre exhaust place you will get the valve and summat there, a fancy tail pipe etc.?

68mm if you can think of anything cheap that size

 

[AndyStobbs]

Coffee container lid or similar

 

[steveo3002]

i was hoping to find something a bit strudy...i will have to jubilee clip it

was thinking exh tube with a welded on end cap then a bolt on tyre vavle

 

[hareng]

68mm if you can think of anything cheap that size

Got one with a quick fill nipple on to attach to compressor via regulator.
The only way I found a boost leak which turned out to be intercooler leaking.

Must be a Golf theyre all prone to leaks.

 

[steveo3002]

do you hear em hiss or slosh soapy water over the joins

 

[the snooper]

yes i need to figure out a way of pressurising the system ...need a suitable bung with a bolt in valve

cut a piece of 18mm ply in a circle to suit the hose and glue an old valve into it if you dont have the bolt in type, works a treat

 

[normspanners]

68mm if you can think of anything cheap that size

as I said earlier a screw lid off a 25 ltr container they are 67 mmish just grind off the vertical 'thumb' lumps but leave the bottom 'swage' ring, drill a 1/2 hole pull in a tubeless valve, two minutes and you have it, I have one in my truck I made, in the field, just for this job, and its still used.

 

[BrokenBiker]

i had similar issue with megane. turned out to be cam position sensor and crank angle sensors needed changing