4age not continuing running

[kpimpin61]

allryt guys ive hada search and nuthing seems to get me anywhere so im guna ask

i have a 16v 4age in my kp61 starlet was running mint a week or 2 ago hasnt run since then , so i jump in slap the battery on and now itl crank over start up and idle for bout 4-5 seconds then just die, crank it over n itl do it again then on the third go it wont start just fire evry now n then, if i do the same and touch the throttle itl die straight away

I hard wired the fuel pumps( is running a surge tank) to the run position n doesnt change
blocked the fuel return hose from pressure reg n same shit

what you guys rekon?
its not bringing up any fault codes either?

cheers in advance
andrew

[Kender]

I think you're right to look to the fuel supply. Sound like a lack of fuel. Have you checked the filter on the fuel pump in the tank? It didn't take much to block the fuel pump pickup on my MR2

[kpimpin61]

the filter before the lift pump is brand new but will check tomorrow, has another filter after main pump which has been on there for a while n has been sitting there empty for a while now so am going to replace that tomorrow too

[jondee86]

Check that you have 12 volts at the injectors when the ignition is ON.

Cheers... jondee86

[kpimpin61]

should i have voltage at both terminals when i turn to run position at ign switch? wen i crank it the black wire looses the voltage?

[jondee86]

Yup... when the ignition is on, there should be voltage both sides of
the injector plugs. The ECU earths the injector to fire it, so you would
expect to see the voltage go away intermittently (drop and then come
back in a rapid cycle) on one side when cranking. The other side (supply
side) should stay pretty much at 12V.

Sure sounds like a fuel fault tho. After it has started and died a couple
of times, are the plugs wet with fuel ??

Did you have anything electrical off the engine at all. Like dizzy or
igniter ? Wires disconnected... that sort of thing ??

Cheers... jondee86

[kpimpin61]

wen i was checking the voltage at the injectors while cranking i couldnt see the voltage drop then come back?, either it was too fast for me or it wasnt hapening at all, plugs are wet after a while cranking etc running for 5 seconds dieng etc etc

ive unplugged the sensors one at a time to try isolate it and fixed 1 dodgy wire from the dizzy, has mint spark fuel to the rail etc etc n the bloody thing wont go, seems like its just running off what the cold start injector pumps in wen it does fire up

[kpimpin61]

ok been on a mission tonite and found that even when the wiring loom is unplugged from the ecu the 2 wires at the injector plugs have continuity which they shouldnt( have been looking through wiring diagrams) so i plasn to fix this tomorrow and il let yas know how it all goes,

cheers for ya help guys much appreciated