Phase 1 Overfuelling - Tried a number of things but unsuccessful to date.

[MilesH]

Hi,

I have done a search but not found anything concrete so thought I'd ask.

I have an early Phase 1 which can only be described as 'running like the choke is out' and is overfuelling.

I have replaced the following:

Both O2 sensors
Crank sensor
Throttle body
All injectors
Air intact pressure sensor

Before I continue to replace random items can anybody shed any light on the possible cause?

Thanks

Miles

 

[Mar172]

What temp on the gauge mate does it warm up

 

[Dan@SJM]

Why not have it on a diagnostics and have it diagnosed properly rather than replacing random things?

 

[Carlv8415]

Where about's are you located? Like Dan says wouldn't it be best to get it plugged in first ?

 

[MilesH]

I've plugged it in and it comes up with secondary 02 sensor fault, but I've replaced that with 2 different sensors (incase one was faulty) and the problem still exists.

I'm located near Cirencester, Gloucestershire.

Carlv - I've just noticed you're in Ciren, I'm just outside Fairford

 

[Laine_16v]

Loom fault (chaffed wire, corroded, snapped, dirt in connector) i had the same problem.

 

[MilesH]

Loom fault (chaffed wire, corroded, snapped, dirt in connector) i had the same problem.

Thanks, you sound pretty confident that it will be that. I assume it's just a case of going through each lead and connector one by one

 

[Paul172sport]

I've heard they wear thru as it goes over the gear box so maybe try there first.

 

[Mar172]

Mine was over fuelling because it was not getting up to the right temp , changed the temp sensor switch and thermostat and coolant and now runs spot on .

 

[Laine_16v]

Thanks, you sound pretty confident that it will be that. I assume it's just a case of going through each lead and connector one by one

Logic dictates that if you have changed the sensor for new and the fault code persists, you either have a faulty new sensor, or a wiring loom problem. I'd go with the loom...

 

[Carlv8415]

I've plugged it in and it comes up with secondary 02 sensor fault, but I've replaced that with 2 different sensors (incase one was faulty) and the problem still exists.

I'm located near Cirencester, Gloucestershire.

Carlv - I've just noticed you're in Ciren, I'm just outside Fairford

Pop over and I will plug it into my diagnostics machine. Can check your fault codes for you ?

 

[Dan@SJM]

You want to read live data rather than fault codes.

 

[Carlv8415]

Can read live data if you want ? Fuel trim ...

 

[MilesH]

Carl - PM sent

 

[Dan@SJM]

Look at fuel trim, lambda readings, map readings, throttle readings etc