another Kjet problemooooo

[86gti]

Ran into a spot of bother...
I replaced the main pump resivour on the gti on monday...
cleaned everything up (the pump is less than 2 years old)....put it back together ,run the pick up pump to get fuel into resivour, for about 8-10 sec..wired it all up and off she went...all was well......finished up and didn't think anymore of it. Started raining yesterday (uncommon in tassie lol)...
Went to move the car.....no go tried to start but just wouldnt go...
Same symptoms I had when the main pump decided to go....
I now have a relay that primes the system twice when u turn the key. so i turned it on and off a few times and still no go.....

Left it for about 2 hours turned the key......ran on 2-3 cyl for about 10 seconds then was fine. Went for a drive went ok, no probs..turned it off left it for a couple of hours, started fine again...

Went out thismorning and same thing.....ran the pumps a couple of times and it fired but on 2-3 cyl again blowing some fuel smoke..... let it idle for about 10 mins and it came right again.....

Strange that it has done this only since the new resivour went in...
Double checked everything, all seemed fine.
I dont have a pressure tester but all the flow rates of the pumps are just above what they should be. The check valve on the pump is new.

Any ideas???

once its going it runs fine............ just has issues starting when cold it seems, and when it does start it sounds like a damn subaru!!!.....

[Preen59]

Leaking injectors? They could be leaking and filling the inlet with fuel when it sits for a while. When you go to start it, it fouls the plugs and looks rich, then comes good.

Only a suggestion, one of the Kjet whizz's might chime in and tell you exactly what it is.

[86gti]

all that seems fine.... I know most of my way around the system but all the tests im able to do with the tools i have point to everything being ok. lol...

I'm thinking its a pressure problem........... I dont like what I'm thinking

[h100vw]

Leaking injectors? They could be leaking and filling the inlet with fuel when it sits for a while. When you go to start it, it fouls the plugs and looks rich, then comes good.

Only a suggestion, one of the Kjet whizz's might chime in and tell you exactly what it is.

Would be my guess too. I have had plenty of K-jettters in the past. Run the motor and then switch it off. Then pull the injectors out of the manifold and look for leaks.

The best thing to do IMO would be buy a pressure tester for the K-jet system and following the troubleshooting guide in the Haynes Manual.

http://www.etoolcart.com/browseproducts/CIS-K-jet-Fuel-Injector-Tester-TA33865.HTML

You could leave it connected for a while and see if the residual pressure drops too quickly indicating a leaky injector/s

Gavin

[86gti]

Cheers Gavin...
Got the manual, and a tonne of Kjet related books etc...
But no pressure guage..lol.
I'll have a bit of a look in the morning....

Just weird it has done this since I have done the resivour ...

[Preen59]

Cheers Gavin...
Got the manual, and a tonne of Kjet related books etc...
But no pressure guage..lol.
I'll have a bit of a look in the morning....

Just weird it has done this since I have done the resivour ...

Possibly...

The reservour may have been leaking worse than your injectors, and now that your res. has been fixed, your pressure weak point is your injectors, so now the pressure is bleeding off through them.

Make sense?

[h100vw]

Cheers Gavin...
Got the manual, and a tonne of Kjet related books etc...
But no pressure guage..lol.
I'll have a bit of a look in the morning....

Just weird it has done this since I have done the resivour ...

Are you talking about the accumulator? Can you do a picture of the bit you changed? So I know we are talking about the same thing.

[86gti]

yup

the black tank the main pump goes into.......



its pre pressure tho...so the pressure is after the pump.....
the tank is just what the pump feeds from.

[h100vw]

I always think of the accumulator on the MK1. Basically it removes pulses in the pump pressure. All it is, is a spring behind a diaphragm. I odn't see that it would be connected to your problem at this stage.

I'd still look for leaky injectors and maybe check the spray patterns, to make sure one isn't significantly different to the others.

I don't know if the control pressure regulator/warm up reg has started to fail. I have only seen good and bad ones though.

The bad ones you have to baby into life and have no power until the engine has warmed up quite a bit. Due to a weak mixture. They run really rough/lumpy and don't respond to throttle from tickover very well.

Once up to temp the engine runs perfectly.

I haven't seen ones that got progressively worse and wouldn't dream of buying a new one for troubleshooting due to the massive cost.

Just another though, the cold start injector isn't leaking is it? Maybe you should check that too.

Gavin

[86gti]

Cheers Gavin......
Well...Today. It did basicly what you said.
Started fine, idle fine, but as soon as i put any more than 1500 rpm on it, it started to die.....Take foot off and it was fine......
Let it idle for no more than 15 sec and it was fine!!

Weird thing about the WUR is that when i got the car the WUR was unpluged..
And it stayed that way for a fair while,( i didnt know what the hell it was 3 years ago) had no problem starting back then....but It's been pluged back in for about 2 years now...

Ive been going to order a pressure test kit for a while now.....
Now i guess its a good time to get it...........

I'll get the multi meter out after lunch and have a bit of a look.

[86gti]

Tested the WUR...Everything seems fine there.
Cold start injector is working fine and not leaking.

I'll check main Injectors if problem persists :-S


One thing i did notice, that I have taken out.( dont recon it will make much differance )

The resivour that i got is for both K and KE ....The KE jetronic runs a second pressure valve in the resivour where the fuel enters the resivour...( little white sleeve with a rubber ball and spring ).....In the manual it states the KE and Motronic run this valve and the K doesn't .....
So ive just popped this out so its exactly the same as the one that came out now......

Not shure if this would cause any problems having it in there or not, but by the look of it it seems it would restrict flow to some degree.

This thing.


fits into the inlet on the resivour on KE and Motronic


Came in the Resivour so i've now popped it out and is now the way it was before with the old one...

Here is where the ball and spring sits.



Doubt it would cause issues either way???

Just been out, motor still cold ( only ran it for about 1 min thismorning) and starts fine again...

I'll try and start it early in the morning and see what symptoms i get then...

[Golf Loon]

Probably better without that restrictor. KE Jet has a different startup system and I think the pressure is different.

[Jmac]

Yeah Ke is different , you have to check system pressure and control pressure. Ive still got my K jet book from the course i did in 1989!!! ill have a look and if i can send you some that might help ya. I personally think you are having a drop in residual pressure which can be a dribbly injector or something else. Mate take off the feed at the meter head and pulse the punmp and fill a beaker of fuel and check the fuel condition. K ket hates crap and water in fuel makes it go out of whack. Just before i left Porsche i had a K jet 911 turbo that wouldnt even rev up. I had to drain the tank in that thing and replace the injectors and then set up the system of course , CO and all. Set the plate height and strip and clean the warm up reg. Mate while i write just had a thought have you opened up your warm up reg????? it can get rusty in there. This does affect pressure too. The Porsche one i stripped and cleaned it and that thing went like stink after all of that.
Jmac

[86gti]

Cheers ppl.
Well, Ive been on a big drive. Took her for a bit of a belt into town and around some twisty back roads to get back home. Was running fine.
I've taken out the Valve...So i guess i'll just wait untill morning and see how she goes....

I'll update you on what happens! lol.
Thanks for all the Help pplz =).

[86gti]

A leaking injector is the cause i would imagine.
Started up on 3 cyl thismorning, fuel smoke, gave it a boot full of revs and then it was fine. Starts and runs fine once its been running for a few mins.

Taking it in to consult with Allan Cash (merc specialist in launnie) tomorrow.
Going to get him to do a bit of a check on the whole system and get her all running as it should...
I'm considering selling the car, so I want to know that everything is A1...

Update you all once its sorted..

thanks for pointing me in the right direction pplz ...