Is this a problem?

[Anton]

A few of you might know that I did the timing and colourtuned my SJ last year after I struggled to meet emissions on the MOT.

This year, I got this:



Now, initially I was quite happy with that, but Hilux Scottie told me I must be running too lean, and I'm risking burning my piston tops.


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That's what the colourtune looked like.

Anyone think I'm running too lean?

[Jordi]

Does it start well? Tick over well? Run well? Pull when you put your foot down?

[Anton]

It starts on the button, it idles a little high (1200rpm) when warm (had to set it like that or it won't idle when cold), it runs lovely, pulls lovely for a 1.3. I'm really very happy with it, but he's now got me paranoid about ruining the engine...

I was well happy with it. Now I'm wondering if I'm running too lean? Could I be burning my pistons?

[Jordi]

As long as it's running well. I found my 1.6 on an SU to be very low emissions too.

I don't go for colourtune or anything fancy. It's all setup by eye / sound.

If it was too lean it would tick over badly / lumpy and certainly not at 1200RPM. I don't rev that high crawling round off road.

[ScottieJ]

It should happily tickover at 850-900rpm when tuned correctly.

Presume you have the choke set up for cold start ups?

[Anton]

Yes, I should turn the tick over down as the reason I tuned it to tick over so high was that I didn't have a choke. I fitted one but never got around to turning the idle down...

[donkeychomp]

My emissions on P3 (the vit) were so low the guy checked the machine on a car he had just tested to make sure it was ok. She runs perfectly and loves to be caned a bit. So I'd say fret not!

[Anton]

Well, roger that!