Club 80-90 Forums

Hi expert advisors,
Ive been and done it ..... Far north of Scotland, with a few cold start situations where the revs wouldnt keep up for the
power steering and stalled the bus, but apart from that noprobs... arrived home yesterday and there was a nice parcel from Cj waiting, thanks cj, fitted ecu and air flow meter .... turned the key, petrol pump started, and then, a beautiful thing, it stopped .... fired the ignition, revolutions up, turned steering wheel from side to side, revs increased to compensate, test drive, s**t of a shovel, better performance than when first bought. Absolutely delighted,particularly having done 900 miles with problems, now the vw world seems a different place ... thanks for your help.
By the way, Durness and Lairg campsites are offering free camping if you dont need electric, if you do its 2.50 at Lairg and 6squid at Durness .... smashing places.
Thanks again
best
Doogie


Hi t25ers,
two wee issues I have to offer for your help please,

if yours was a 2.1 DJ water cooled flying machine(relatively speaking of course ) and you had to bypass the ecu effect on the fuel pump relay i.e. the relay is not powering the fuel pump, due to a fault in the ECU, so you miss the relay, with a wee bit of bypass wiring out so the fuel pump is running all the time, would you be happy to run your machine like that, if it appears to be running ok;....
a) forever, b) not at all c) until the ECU is repaired or D) fit a new or reconditioned ECU (if you can find one??) .

If your view is b) what problems if any could/does this scenario present with and is there any inherent dangerous things about to strike me down? and would you go to Scotland this weekend for a couple of weeks touring around the far North of Scotland???

Question two may or may not be related .....
The scene described above is in place and you find engine revs are sometimes not enuff , and stalling occurs when using the power steering for example, or sometimes they are too much, and it revs continuously at about 1200rpm, and doesnt drop off when revs normally would, at a junction etc. Mine is Automatic and the fast tickover revs are enuff to propel said van without throttle.

i suspect there is no connection between scenes 1 & 2, so disonnected the electrics from the air flow meter, and the revs become normal. Does this mean there is no connection between the two faults and the airflowmeter is knacked?

If you know the answer to these problems, and have the bits to fix them, or know someone who does would you be kind enuff to let me know. I would really appreciate it and many many thanks in anticipation.
all the very best
Doogie
(Scotjock)

Doogie, if you have traced a fuel supply fault to the ECU and are happy with the get you by fix then so be it, IMHO if possible try to find a good ECU and put it back to how it should be.
My question is why by-pass the relay if it is the ECU (signal) which is has gone missing ? Unless the relay is also at fault .

In the short term it should be OK to run like this but the choice to go on holiday is surely yours as only you will know how long each trip is likely to take.....

Your second problem/fault could be due to many things and with the ECU playing up then this for me would be the first thing to have a closer look at with the help of a Bentley manual which has detailed sections covering each component and how to test these pieces when problems occur.


Regards


Fritz,,,,,,,,,,,

Having spent a couple of hundred pounds trying to diagnose a fault which turned out to be the ECU I am intrigued with the prospect of being able to bypass various functions of the ECU in a "get you home in an emergency" situation. I am thinking in terms of a simple idiot sheet outlining symptom and bypass method backed up by some wire and crock clips in your tool box. Has anyone got the in depth knowledge to come up with such a scheme?
Cheers
Wolfie

the fuel pump is linked with the hall sender in the dizzy and the ecu,in stock form if you were in a crash or get rear ended if the rotor arm isnt turning then the fuel pump switches off,as you have it if their is a calamity and your engine stops then your fuel pump will continue to pump petrol untill you turn it off which is fine as long as your awake and able to turn it off,cj.

It sounds like the safety fuel pump cut out feature same as the inertia switches the F ord injection systems had (have ?). I wouldn't recommend by-passing this feature, your grieving relatives and insurance company may not understand your fix.

Why not just buy a s/h ecu from one of the breakers ? If these are becoming an issue buy another one too as your 'get me home in an emergency' spare.

Ian.

Thanks Fritz, thanks Cj and thanks Ian,
Your input is greatly appreciated, and everythin youve said is dead on, so I am now in the market for an ecu and airflow meter.
Apart from the danger of not switching off the juice everything else is acceptable until replacement parts can be found.
Fritz, the relay, courtesy of rewiring, is working as it is still running the pump but the ecu isnt switching it on/off.
CJ do you have ecu and flow meter for this engine?
Thanks again fellas
all the best doogie
PS. Smithy, if I can remember how I did it I will put it up.

hi,give me a call i will do you a good deal on both,cheers cj.

Cheers CJ ... Ive emailed you at work.
Doog

Citizen Smith wrote:Having spent a couple of hundred pounds trying to diagnose a fault which turned out to be the ECU I am intrigued with the prospect of being able to bypass various functions of the ECU in a "get you home in an emergency" situation. I am thinking in terms of a simple idiot sheet outlining symptom and bypass method backed up by some wire and crock clips in your tool box. Has anyone got the in depth knowledge to come up with such a scheme?
Cheers
Wolfie

OK maybe not...
Cheers
Wolfie

Wolfie, I have seen a device on the samba forum for the MV 2.1 engines. Someone has made a solid state module that you plug your loom into instead of the ECU, and it has individual tests which check the function of each sensor, wire etc. Using this as a template it would seem fairly straight forward to manufacture one for the DJ. This then could be used by members to test injection systems much more logically than our random gueswork.

I will try and find it, it had a wiring diagram as to how to make it, Standby....

Hi expert advisors,
Ive been and done it ..... Far north of Scotland, with a few cold start situations where the revs wouldnt keep up for the
power steering and stalled the bus, but apart from that noprobs... arrived home yesterday and there was a nice parcel from Cj waiting, thanks cj, fitted ecu and air flow meter .... turned the key, petrol pump started, and then, a beautiful thing, it stopped .... fired the ignition, revolutions up, turned steering wheel from side to side, revs increased to compensate, test drive, s**t of a shovel, better performance than when first bought. Absolutely delighted,particularly having done 900 miles with problems, now the vw world seems a different place ... thanks for your help.
By the way, Durness and Lairg campsites are offering free camping if you dont need electric, if you do its 2.50 at Lairg and 6squid at Durness .... smashing places.
Thanks again
best
Doogie