K-Jet Help Please!

I have a problem with my 91 Gti Cab, randomly when im driving along it sometimes out of no where the car feels like it has just braked by itself, then further along it will just cut out, the engine will turn over but not fire until its been left say 20 minutes. I have had a mechanic look at it and thinks it may be the Ignition Module, but he bought a new patterned one but the car will turn over but not fire with it in. should I just buy a genuine second hand one and get mine repaired? Or has anyone got any other ideas? It literally feels like my car has been starved of fuel then carrys on fine again,

Many Thanks!

A friend of mine has something that sounds very similar. He replaces the fuel pump relays as his get really hot as a last resort to get him home. He's also had trouble with the injector seals which were helping bring this on. When it's at idle spray some wd40 at the seals to see if it makes a noticeable difference. Since replacing them his problems have almost gone.

What I would look at first is the fuel filler neck, see if you can spot any rusty holes by looking into the filler with a torch (no matches please!) the look under the wheel arch to check there as well. If all ok then does the fuel pump run, there is one in the fuel tank as well as under the car, the one in the fuel tank has a filter on the end and can get blocked with rust/dirt in the fuel tank so stopping fuel getting to the engine. Test the fuel pump relay you can get the fuel pumps running with out the engine running by taking out the relay and hot wiring the two big connectors or by putting in I think the indicator replay in upside down but CHECK this as I'm not 100% sure, there is info on which relay to use on this site.
Also might be worth putting the old module back on the car as at least it would start with that one and go from there before throwing any more money at the car.
Word of warning, only run the fuel pumps without the engine running for a few seconds or you'll burn them out.

if fuel side ok then when was the car serviced or HT leads, dissy cap, rotor arm and spark plugs last changed. Fuel filter in the engine bay should really be replaced every 20,000 miles.

This is great information guys thanks for the help! I shall check this soon as I can, would you think its worth trying another module and go from there also?

may as well, mk2 golf ones are the same

Thanks again, do any of you know any specialists near the cambridgeshire area by any chance?

sorry no

Why do you need a specialists? These are simple cars with simple engines…
I know alot of newly trained mechanics can't do much unless they have a laptop pluged in and then just throw new bits at the car untill the problem goes away.
There must be a decent garage near you which know something about these cars, have a look in the yellow pages etc and see if one is in the "good garage scheme".

Or get a haynes manual and have a go yourself, everything in my last post is possible to do with little tool and experiance……

mark1gls said

Why do you need a specialists? These are simple cars with simple engines…
I know alot of newly trained mechanics can't do much unless they have a laptop pluged in and then just throw new bits at the car untill the problem goes away.
There must be a decent garage near you which know something about these cars, have a look in the yellow pages etc and see if one is in the "good garage scheme".

Or get a haynes manual and have a go yourself, everything in my last post is possible to do with little tool and experiance……

I'd love to try to it myself but i may make it worse and wouldny know where to start, have you got a haynes manual for  a

mark1gls said

Why do you need a specialists? These are simple cars with simple engines…
I know alot of newly trained mechanics can't do much unless they have a laptop pluged in and then just throw new bits at the car untill the problem goes away.
There must be a decent garage near you which know something about these cars, have a look in the yellow pages etc and see if one is in the "good garage scheme".

Or get a haynes manual and have a go yourself, everything in my last post is possible to do with little tool and experiance……

Id love to try and sort it myself, but what if i make it worse, i havnt a clue, but im going to try, does anyone have a haynes for a 91 gti cabby or send me a link to one please? Cheers guys

To cover your engine, fuel system, running gear, brakes, electrics etc… you need this (Mk2 Scirocco same floor pan)

http://www.ebay.co.uk/itm/VW-Scirocco-1982-1990-Haynes-workshop-manual-/161172747958?pt=UK_CarParts_Vehicles_Manuals_Litterature_ET&hash=item2586a4f6b6

To cover the body work, trim, light fittings etc you need this (does cover some of the injection system)

http://www.ebay.co.uk/itm/Haynes-Manual-VW-Golf-Scirocco-Mk-1-inc-GTi-1974-to-1979-/380778427379?pt=Non_Fiction&hash=item58a829b3f3

Perhaps someone living closer to you could lend a hand or show you what to do as I'm sure once you have watched someone else doing the work you will pick it up no problems and be servicing your car… Always a learning curve with old cars :-)

There is a how to guide on this site the last post is about changing the filler neck it gives you pictures on what you're looking for and where the opening to the top of the fuel tank is under the rear seats. There is also lots of help with the basic things like changing the air filter. A Haynes manual is a great tool to have at home as lots of info in there on all this.

Thabk you so much for your help, ive ordered the second one you sent me but the first one has ended and i cant seem to find another one atm, i guess your right its a learning curve but once ive learnt how to do it if the problem occurs again it'll be much easier and without the help of a mechanic, are you a mechanic by trade or just self taught and know about your cars? I will give tje filler kneck a look thanks.

get the brown haynes chap covers both mk1 golf, cabrio and scirocco models. its the best one out of the lot

heres one:
http://www.ebay.co.uk/itm/VW-Golf-Jetta-and-Scirocco-Petrol-Haynes-workshop-manual/221336965855

also have a read of the mk2 16v guide, most of it is the same for the 8v kjet lumps except when doign the ignition timing you need to disconnect and block the vacuum hose to the dizzy, plus theres a few extra bits bolted on that you wont have such as isv, over-run curt-off valve etc but the basics are all the same
http://www.vwgolfmk2.co.uk/forum/viewtopic.php?f=37&t=25972

rubjonny said

heres one:
http://www.ebay.co.uk/itm/VW-Golf-Jetta-and-Scirocco-Petrol-Haynes-workshop-manual/221336965855

Thata awesome but mines at 91 gti it doesnt say it covers that?

rubjonny said

heres one:
http://www.ebay.co.uk/itm/VW-Golf-Jetta-and-Scirocco-Petrol-Haynes-workshop-manual/221336965855

Thata awesome but mines at 91 gti it doesnt say it covers that?

rubjonny said

heres one:
http://www.ebay.co.uk/itm/VW-Golf-Jetta-and-Scirocco-Petrol-Haynes-workshop-manual/221336965855

it covers it dont worry

the 91 is same as the 85 really, only thing it may not cover specifically is the clipper body kit but thats not really any different to normal bumpers just has extra trims clipped on the side.

edit: oh and if you have a very late one with the digifant fuel injection system then you'll need a mk2 haynes if you really want the info on that, but you dont really need to worry as its well covered on the forums plus theres my digifant faq

awesome ive got both now, so should be ready to attempt to fix it! thanks for your help guys!

As I mentioned I thought it was the ignition module I changed that, the problem still persisted then I noticed some of the bolts and screws were missing so I replaced all them so it was fixed properly and had a sufficient earth for it, but today it cut out again. If for example I hammer it in 2nd gear to its limit the engine just cuts out and wont restart for a while, the engine turns over perfectly but just wont fire back up. Any suggestions guys? Thanks

If its cutting out when you reach the rev limiter don't hit the rev limiter, the engine runs out of puff at about 5,750 rpm so not much point reving any higher.
I belive the fuel pump relay has the rev limiter built into it so maybe try another relay as it might not be resetting after the limiter has come on.
Do you hear the fuel pumps running when trying to start the car after it cuts out, if not the relay is not working, try exchanging the fuel pump relay for the indicator relay and see if it starts.