ECU error 29?? help thanks

[andy_mk3]

Hmm, bit of an odd one that is! You have air, fuel, spark, compression all happening at the right time, you'd expect it to work !

I don't really know what else to suggest. I'll have a think about it, someone else might be a bit more clued up than I am though (it wouldn't take much!)

[Steve0011]

i will check your original idea of the 12v earthing out to the relay, do you know if the fuel relay fused ? if its not then a voltage drain to earth could quite easily be the problem

[andy_mk3]

As far as I can tell there's no fuse between the power feed and the relay. There's a fuse between the relay and the pump though.

[Steve0011]

you know what? its sounding more and more like what you said

i will let you know how i get on

thanks for the help

steve

[andy_mk3]

Well, it's a possibility worth looking at!

[mowgli]

ok, is this an engine that has been previously run in this car, or is it a fresh transplant?

[Steve0011]

it is/was a transplant

i fitted it along with a complete loom and ecu

the engine was running fine a while back, even drove it round the block a few times. now it just wont start straight away once it does start its lumpy and dies when given throttle

i suspected fuel and now code 29 has come up its starting to check out, either the relays OR a wiring issue for the 12v supply to the relay

steve

[Steve0011]

update

another fuel relay fitted 12.2 volts at the relay, this drops to 10.1 when cranking fuel pressure is constant 3.5 bar

i have noticed something???? the 12v supply shorts to ground when the ingnition is off and 0 volts, is this normal?

i hate electrics

[andy_mk3]

10.1v when cranking is fine.

I don't think it should short to ground with ignition off though. You should have an ignition live and permanent live feed to the relay, output to pump and connection to the ECU.

[Steve0011]

sorted now

i ran a complete new wire for the relay live

thanks for your help buddy

steve