K-Jetronic Recommissioning

[Trommel]

I've been trying to get a K-Jetronic B27E running after a few years in the barn. With fresh fuel and spark confirmed and lots and lots of cranking, it eventually ran for a couple of minutes or so - I held it at around 2500rpm, it seemed to be running on all cylinders and came up to temperature as normal. However it wouldn't idle and stalled without the accelerator depressed.

I did eventually get it to run again (it would only start after being left for a minute or so - thought it may be flooded so cranked it for a few seconds without the fuel pump fuse, but that didn't make any difference) - however, the revs were rising and falling on a steady throttle and it stalled when left to idle. Since that I haven't been able to get any sign of ignition from it.

I'm assuming that the fuel line and filters are OK given that it ran for a couple of minutes (but I will check at the filter) and there is still a spark - any suggestions as to what to check next?

[classicswede]

Was it your ad on ebay?

[Trommel]

eBay? No, it's something I've had for nine or ten years.

[geoffo]

You should change your injector seals ASAP - it's easily and cheaply done and will have a transformative effect; maybe pull your cold start injector too...

[Trommel]

There are no fuel leaks - what effect could new seals make?

Had thought the cold start injector might not have been working, but it won't start when hot either.

[classicswede]

Someone had put an add on ebay asking for help with a similar issue and again the car had stood for a similar amount of time.

The K jet system is probably gummed up where the fuel has gone off. I would start with giving a good clean and buy a couple of fuel filters. Replace the existing on and then after a short time replace that as it could be getting blocked up with deposits from the tank

[Trommel]

Gummed-up lines was my first thought (until it started). Don't much want to have to strip the metering head - I'll take the line out of the filter off to see what's happening as a first step - thanks.

[stephend]

Two relatively easy things to try. One is to clean up / de-gum around the air metering flap; the other is to check the idle air bypass valve (tubular thing bolted to head, with pipes into the top and bottom, and a half-moon flap inside).

[geoffo]

if you can get it running spray wd40 on each injector in turn, if the revs rise then they need doing. Agree with everyone else's comments - and would like to add that 240's seem really sensitive to rotor arm/cap problems - have you checked/replaced?

[jamesy12345]

Hi there was a pretty good series on K-jet fault finding in recent copies of Practical Performance Car. If you send me a PM I can scan useful bits if required

Also the company below can help with parts...for a price...

http://www.kmipetrolinjection.co.uk/...K-Jetronic.htm

I was planning on using them for my Renault.

Idle air valve stuck closed will cause low/no idle, but that wouldn't explain rising/falling revs on steady throttle - could be that the fuel distributor (metering head) needs a service.

Useful link here...
http://www.914world.com/bbs2/index.p...showentry=2520