Turbo Engine Xu10 J2te

[mwilcock 0]

Can anyone help?

 

engines in and running, ive got the lambda sensor plugged in, map sensors piped up and the little black relay at the back of the engine is connected

 

starts ok ish, idles ok ish

 

drives fine, until it starts to come on boost, it pops bangs farts backfires, plugs are black, which indicates overfueling?

 

Anyone got any ideas?

 

Thanks

[whizzer71 0]

Have you had the cam belt off?,Is the air filter clean?,are all the boost pipes in good nick and is the little vac hose connected to the ecu ?

[welshpug 1,655]

where is the MAP sensor plumbed in? it was doing all this before you plugged the MAP and Lambda in so it's sounding like a Throttle Position sensor problem.

Edited May 5, 2008 by welshpug

[mwilcock 0]

the cambelts not been off but it WAS loose when i bought it so i tightened it up, yes it may of slipped

 

map sensor is plumbed in

 

i just dont understand this engine?

 

what a pile of crap lol

 

its like its in safe mode/limp home mode or summot

[mwilcock 0]

and now my icv has packed in??

 

you can hear it buzzing and when it starts it used to sound loud like a loud sucking of air noise, now it wont start grr

 

12v at one pin, earth at the other, and nothing at the 3rd

 

when its plugged in the pin that had nothing comes to 9v??

[inferno 1]

Is there a sucking or wooshing sound that could indicate bent valves when turning over?

[mwilcock 0]

yeh it was wooshing through the idle control valve

[mwilcock 0]

does anyone have some pics of where the timing marks are?

[whizzer71 0]

The top and bottom pulleys have "Dots" on them that you can use to align with the white lines on a genuine belt,Failing that the cam pulley has a hole in it and there is a hole at the rear of the cylinder head (7 or 8 o'clock approx) that it will peg into,Dont trust the crank pulley as this a two piece job on these engines and they always "spin" so I usualy use an old 8v one piece gti pulley and use that to align the bottom ,it will peg out with a drill bit at around 11 o'clock ish but if you remove the lower pulley and plastic belt cowling you can see where its supposed to locate.

If you have a haynes book of lies it the same for most the 8v XU's just the earlier alloy engines have a different tensioner assy.

 

[mwilcock 0]

does the cam pulley get pegged when the engine is at tdc?

[whizzer71 0]

No the pistons are all half way up the bores (i.e. all level)

[mwilcock 0]

so the bottom pulley, gets pegged, looks a bit of a s*it way too, its like part of the side of the bottom pulley, which lines up with like a hole in the engine , just looks a bit crap, nothing like a 1.9 gti what ive seen pics on here of....

[whizzer71 0]

Well its basically the same as a 1.9 gti,or an MI or Gti6 come to that,they all have a hole on the bottom pulley and a bit behind it cast into the aluminium that it then pegs into

[mwilcock 0]

left the locating bolt in the camshaft pulley and turned the engine over

 

has anyone got a gun so i can shoot myself?

[whizzer71 0]

OOPS ,did it snap the belt ?

 

[mwilcock 0]

no it looks like its slipped a few teeth and its took the bolt round

[whizzer71 0]

Phew that was lucky ,realign it and try your luck,I would advise getting a new belt tho !

 

[mwilcock 0]

yeh gonna get a new belt 2moro

 

timing looked ok though, bottom hole was lined up and the camshaft pulley hole was lined up

 

i cant understand whats making this engine run so bad on load and boost

[whizzer71 0]

Did it run ok when it was in the donor car ?

 

[mwilcock 0]

god knows, aparently so....

[mwilcock 0]

right then

 

just checked the tps sensor

 

and according to this table

 

clicky

 

its reading backwards

 

5v when closed, 0.48v when fully open?

[mwilcock 0]

anyone shed any light?

[whizzer71 0]

That table is for the 6' engine,I think you'll find that the turbo TPS works the other way around,The switch may be different also,I know that they are definatley different between S16 and Turbo.

 

 

Edited May 5, 2008 by whizzer71

[mwilcock 0]

can anyone put a "" DEFINATLEY DIFFERENT AND WORK OPPOSITE WAY "" behind that please?

Edited May 5, 2008 by mwilcock

[inferno 1]

tps wont affect it running as bad as your saying.

 

Id suggest you compression test it now the belts on in the correct timing position and post the results.