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Megasquirted V8 Running Issue - Ideas ?


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This is an odd one, I have been trying to sort the owner out for a while now, nothing so far has had much effect

Rover V8 Running MS1 V3 MS SnE (EDIS 8)

"The Issue"

Starts when cold on the button, ...warms up runs 'sweet as a sweet thing'...

But :huh:

If you then switch it off.... it won't start until it cools down to below 50

.....once below 50 it starts......again 'sweet'.

So far he / we / I have :

Changed all plugs

Changed CTS

Chnaged MAT

Checked earths

Checked reloaded Firmware and ECU MSQ

Done a log, all looks fine

Check air filter

Engine runs cold (Rear Engine racer big rad and fans) so

dropped WUE to 100% for all cells in case of flooding

checked VR Sensor and conectors

Just asked him to check fuel pressures and PRV

When running everything checks out

:blink:

Anyone any ideas ? (and I am only thinking that there must be more than the above tried so far :lol: )

????

Nige

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You may have changed WUE but have you fiddled with the cranking fuelling? Could be flooding/starving it during cranking.

Does everything look OK when it's refusing to start (all gauges in spec in MT) or anything amiss?

CVhecked all that and reloaded firmware and MSq known good

All guages look spot on :blink:

Nige

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As above, cranking fuel setting is where I'd start. Until the rpm exceeds the cranking speed rpm the cranking fuel pulse width is the only thing used as a basis to calculate fuelling. I'd guess that your cranking pw is set too high and your WUE may be too low when it's cold, you need to get the cranking pw set when it's hot and let the WUE compensate for that when it's cold.

When you are cranking and it doesn't start, is it trying to fire at all (catching and dying ?) or is it as dead as a dead thing ?

Not sure why you'd change sensors out unless megatune was showing something amiss, was it ?

Is it using a standard fuel rail/return setup ? (thinking about possible fuel vapour locks)

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Nige...

Whats in the heat soak area? (Coolant related air density stuff...)

If it only starts below 50 degrees but runs well from below 50, surely it's got to be fuel related?

Have you zero'd warm up enrichments over 40 Degrees to see if it makes a difference ?

Just finkin...

Neil

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Nige...

Whats in the heat soak area? (Coolant related air density stuff...)

If it only starts below 50 degrees but runs well from below 50, surely it's got to be fuel related?

Have you zero'd warm up enrichments over 40 Degrees to see if it makes a difference ?

Just finkin...

Neil

All good ideas :)

All tried :(

Doing my (MS) Head in :blink:

Nige

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Tried unplugging the temp sensor so it defaults to a known value?

Yup

and the resisitor trick :(

Nuffin, still won't start when hot, drop to 50 degrees and starts like a pussycat

and purrs, seriously werid - can't think - but is there anything in the ECU that could cause this

if some internal smokr found its way out ?

Nige

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Right :D

Lets have some Fuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuun :P

The forum members interested in this have a collective 20 Questions.

These Q's can only answer a Yes or No from me.

See if I win :) (Fridge is banned from playing as I discussed it with him this afternoon and knows :lol: )

so, from the above 2 x Qs gone, so 18 "Yes / No" Qs to go

Yipee dooo, let the fun commence :D

Nige

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