Long term fuel trim

[mb450]

I've noticed my chimaera has been drinking fuel more than usual.
Hooked up rover gauge and the long term fuel trim is adding heaps of fuel. The "odd" side is getting more adjustment than "even"

I've checked the lambdas and they're switching.
I've swapped plugs, ht leads as they were well overdue.
It idles very well and I cannot hear a misfire.

Throttle pot seems fine.

The only thing I'm thinking is the camshaft. At 75k it's still running the original gear.

Anyone got any ideas?

[Pupp]

Coolant temp sensor?

[mb450]

Could be that, is there a reliable way to test?
I checked the water and fuel plugs weren't switched around.

[Pupp]

Just treat them as a consumable as they do screw the mixture when on the way out - watch the quality on replacements; been a few threads recently

[mb450]

Ok will order replacements for both

[blitzracing]

Dont worry if the sides of the V8 are different- thats normal. You say the trim is adding fuel- so the probes are running lean then to correct the mixture, this is the wrong way round for bad MPG. Make sure the short term is cycling cleanly to show the probes are switching as they should.

[mb450]

I'll post some screen shots up in a bit not 100% sure I'm reading roverguage correctly!

[mb450]

Here's the long term and short term fuel trims - this was after about a 20 minute run.

[mb450]

Anyone got any ideas on what I should look at here?

[NZ fan]

My car started showing similar symptoms a while ago. I eventually found the trumpet base loose so sucking unmetered air
So might pay to check for an air leak somewhere. Car now runs very low long term trim (5 to 10%) from memory. Good luck

[blitzracing]

Its basically telling you the mixture without trim correction is a bit lean so it could be an small air leak certainly, and this is set at idle, when the inlet vacuum is at it highest so air leaks would have the biggest affect. The ECU is coping OK, its just something has altered since the car was original mapped, where the game is to get the long term trim as near zero as possible when it left the factory.

[jojackson4]

Any idea what this is
Short term is dancing at the mid point +~10-20%
Long term looks like this

[blitzracing]

Id suspect a wrong sensor reading such as AFM output high, temp low, or wrong fuel map in the ECU. Mechanically the fuel pressure would need to be to high to get this.

[jojackson4]

Like this ?

[jojackson4]

Had the steper unplugged

[blitzracing]

Thats odd- unless it was not reaching the target idle speed to reset the long term trim- one to add the list of "strange things the 14CUX does".

[jojackson4]

The map is 5
5l car
Temp sencer is within 5 deg of the dash gauge
AFM may be the link of the chain that's tits up

What's the left bank fault?