2.1 dj not starting went hot

[trikepete]

1990 2.1 watercooled dj engine was fine untill saturday
nipped into shop to get some beers came out it would not start
cranked over fast but would not fire
left it walked home went back and she started
so now in the morning she starts ok two miles up the road stop and turn off spins over fast will not fire just like no fuel getting to engine then leave it to cooldown and bingo she ok again any idea what it is thanks in advance

[syncrosimon]

Things (that spring to mind), that are temperature related and can cause complete failure are the coil, and the ECU. Best way to progress is to find someone with a running DJ and swapp bits till the symptom goes away. Sound electrical.

Do the usual preventative maintenance of going through the wiring connectors with a fine tooth comb, looking for frayed wires and corrosion, and repair as necessary.

Do a fuel check by pulling one of the hoses near an injector, and seeing how much fuel she pumps with ignition on in 30 seconds as per Haynes and Bentley manual. If all is well with that then I would say it is an electrical fault.

Simon

[trikepete]

thanks for info i am leaning towards the sensors being at fault will try the water one first and go from there

[syncrosimon]

The water ecu temp sensor wont cause the engine not to start, it will think it is cold and en-richen the mixture if it is knackered. It would have shown symptoms of a high tick over before now. If you had a faulty temp gauge and someone in the past would have had to turn down the tick over, then fitting a new one would make the tick over too low and would stall. Should start though, then stall.

If you short out the ecu temp sensor the ecu will think that the engine is hot (no resistance), set the tick over then, if you can get the thing started. Next replace the wire and see what happens to the tickover. If it is knackered the hot tick over will then be way high.

Be methodical, the best way is to follow bentley and go through each component checking as you go.

This is the schematic for the MV engine, with lambda sensor.

[trikepete]

found a mug
sorry a mate with a dj engine and swoped the temp sensor as you said made no diffarance still starts ok when cold but not when hot was going to try swoping others bits to find the fault if all else fails take it to someone near milton keynes who knows these digijet gizzmos
any one know of any good mechs near me