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View Full Version : Help - C20LET Overfueling on idle an whilst driving.



krobinson
21-05-10, 08:12 PM
Before I burn my Nova, I'm hoping someone can help :mad::doh:

It's been running 100% for over a year, but this last few weeks when i've brought it out of the garage for a run, it's been overfueling. I've got a wideband, and when I start the car it just go's straight to 10 (the lowest number on gauge, so could be lower than 10)

When I take the car a run, it stays at 10, splutters and misfires on boost.
However it's an intermitent problem, sometimes i'll start and wideband will show 14-15 and then sit at 11 on boost, just the way it should. But tonight its getting worse and showing 10 nearly all the time.

It's a standard engine
Hybrid turbo
3.5bar FPR
Phase 2 ECU (copy chips, but never had an issue till now)

When it's showing 10's on Wideband, if I remove the vacume pipe then it fuels normal again on idle, so i'm assuming the ECU is pulling the fueling down?

Any help would be greatly appreciated.
Keith

turbo-boy
23-05-10, 10:07 AM
air flow meter mate could be reading wrong and playing about with your fuel?

let_nova
23-05-10, 10:37 AM
when mine overfuelled it was down to a damp ecu lol

turbo-boy
27-05-10, 12:13 AM
did u get this sorted mate

krobinson
27-05-10, 10:34 AM
I drove it for about 100 miles later that day without a single issue, it's a strange one!

If it comes back i'll let you know.

John
27-05-10, 07:59 PM
coolant temp sensor.