S2 ABY black smoke and misfire on boost, temp sensor?

[macspring]

As Andy, and also if the car is a keeper, buy new MGK spark plugs, and then the new style coils if you still have an issue. I like the look of of the oem coils, but if there are not working adequately after 17 years better to replace them with ones that do.

It gets rid of the old boots, the POS, and the coils themselves in one go.

Then I'd look at a new N75, and a bypass valve.

These cars are old, but as mentioned if a good few items are replaced in a short period of time, there will be less to break. Chipped and going well, they are pretty good / fun. And now no depreciation, compared to new / newer cars.

HTH you a bit, always trying when they don't work.

[Cossie7]

hi thank you a;; so much for the help fee; really welcome lol

i dont suppose anyone knows where to buy a bung from or what i need to make one?
also ive just noticed there is a vaccum pipe going to the waste gate and from what i can see because its had a hard pipe kit fitted the standard recirc dump valve has been removed and the vaccum hose must have been connect to the wastegate for some reason lol

would that make any kind of difference?

anyways im going to start back at the basics as advised!!

many thanks

[Rikki Kitto]

It is absolutely imposable to find boost leaks by eye and ear I chased mine for 12 months then took it to VRS for the test, you wouldn't believe where they can occur, behind jubilee clips for instance

[andy10v]

I will measure my bung later.

There should be a hose going to the side of the wastegate from the N75, that is what controls boost.

Do you have have any pictures of the engine bay?

[Cossie7]

ok thanks

yes the one from the n75 is in the right place but do you know the little nipple at the top of the wastgate that should be open to atmosphere? the small bore vaccum hose from the DV is going to the wastegate nipple

i'll take some pics tomorrow in day light

thanks

[andy10v]

My plug is 75mm, its a loose fit into the maf hose (I think the maf is 3"/76mm) works fine, tested to 30psi, drill a hole in the end and pop in a car wheel valve. A 17mm wheel bolt head blanks the crank breather in the maf hose if you cant find a bit of round bar.

I normally pressure test to whatever boost I will be running, some people recommend 15psi or so I think.

You can control boost with the top chamber, but it is unusual.

What other mods does the car have? People will give advice based on the assumption the car is stock unless you say otherwise.

[twoqu]

The wastegate top nipple should be open to atmosphere, so nothing should be attached.
The dump valve assuming its stock should be plumbed into the inlet manifold.

[twoqu]

Its not a dump to atmosphere by chance as stock is recirculating.

[andy10v]

Standard

[Cossie7]

The car as far as I know it's standard apart from hard pipe kit and front mount with full stainless exhaust.

Also what did you make your actual bung out of?

Also what should a standard ABY boost to? I've seen 15psi tonight when it did decide to boost lol

I best remove that vacuum pipe from the waste gate aswell

Thanks

[andy10v]

Dont know I am afraid, some kind of pipe fitting.

Like this;



Maybe look for a 75mm pipe end cap?

Stock ABY is 1.1 bar/16psi I think.

What diverter valve set up do you have? If it vents to atmosphere the car will not run well due to unmetered air.

[Cossie7]

The car no longer has any kind of dump valve as there's no where for it to go, I think it must have been an after thought lol

[UrS4boy]

The car no longer has any kind of dump valve as there's no where for it to go, I think it must have been an after thought lol

Well, with out it, it will run like merde. You need it

[Error404]

Post some pictures of your engine bay particularly the area behind the o/s headlight. That will help to see what has been done. Sounds like a muppet has been messing with it

[Cossie7]