lumpy idle when low on petrol and v hot

[thegman]

Stuck in a traffic jam comign back to London and the car started to idle badly. Would drop to 200rpm or so then the stepper (I assume) would open and recover. I was low on fuel (less than 1/4 tank) and the engine was stuck at 90 for several minutes. On Sunday I filled the car up and the idle was smooth as normal.

Anyone else experienced this? Fuel vapourisation? My stepper is fine before anyone suggests!

[DHUDD]

I ALSO HAVE THIS PROMBLEM! I WAS THINKING IT MIGHT BE THE AIRFLOW METER!?
MY DAD HAD THE SAME PROBLEM ON HIS JAGUAR XJ6 4.2 AND THAT TURNED OUT TO BE THE AIR FLOW METER?
THANKS GUYS

[thegman]

DHUDD said:

I ALSO HAVE THIS PROMBLEM! I WAS THINKING IT MIGHT BE THE AIRFLOW METER!?
MY DAD HAD THE SAME PROBLEM ON HIS JAGUAR XJ6 4.2 AND THAT TURNED OUT TO BE THE AIR FLOW METER?
THANKS GUYS

could be my afm. have recently changed it though. It is definately working though. If it was on limp home you would know about it. need to get it tested

[paulathome]

When you fueled up did you notice a rush of air when you took the fuel filler cap off?
You might have a bit of a vacuum in the tank when low on juice.
Could be you carbon canister is fubar or the valve in said item which vents the tank to atmosphere.
Just a thought.
Paul.

[thegman]

paulathome said:

When you fueled up did you notice a rush of air when you took the fuel filler cap off?
You might have a bit of a vacuum in the tank when low on juice.
Could be you carbon canister is fubar or the valve in said item which vents the tank to atmosphere.
Just a thought.
Paul.

yes - this is exactly what happened - a big hiss when I took off the filler cap.

where is the carbon cannister? I will have a look in the bible.