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[tunnie]

Also tunnie - I'd have thought cambelt setup being correct would have had a lot more impact on efficiency than changing the oil...  :-/

i mean regular changes to keep the breathers clean.

I think cam timming is more for performance than mpg? Will help, but not that much.

Air leaks? dud sensor readings someware, under inflated tyres?

Sometimes just a few psi makes a big difference.

[Taxi_Driver]

Currently economy is low.

Checked cambelt setup, cams 1 and 2 were about half a tooth too retarded, and cams 1 and 4 a couple of mm too advanced.

Likely to make a difference, or not? Some say a lot, some say none - what's your opinion?

That doesn't make sense.

didnt to me either.....but

I read that as 1 and 2 too retarded 3 and 4 too advanced  :-/

[TheBoy]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

[Lazydocker]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

And that's you told  

I agree... The standard service may well (and probably will) return the results you want

[Kevin Wood]

Do the works, too. Run some injector cleaner through it because if the injector spray patterns are rubbish or the flow rates are all over the place that won't help. Change all the filters, clean the breathers, check for air leaks and make sure the multirams are behaving - you know the drill.

Cam timing will have an effect but I think what you're seeing is the result of neglect in every area - so make sure it's all tip top.

Kevin

[JamesV6CDX]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

All in the plan - in fact, is what I was doing tonight

[TheBoy]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

All in the plan - in fact, is what I was doing tonight

So stop moaning about economy until those basic steps have been done

[TheBoy]

Oh, and use genuine GM air filters, not come across a pattern one as good yet

[JamesV6CDX]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

All in the plan - in fact, is what I was doing tonight

So stop moaning about economy until those basic steps have been done

Not moaning - but I see that having the valve timing right IS a crutial step towards getting it spot on, don't you agree?

[TheBoy]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

All in the plan - in fact, is what I was doing tonight

So stop moaning about economy until those basic steps have been done

Not moaning - but I see that having the valve timing right IS a crutial step towards getting it spot on, don't you agree?

As is doing the basics.

[JamesV6CDX]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

All in the plan - in fact, is what I was doing tonight

So stop moaning about economy until those basic steps have been done

Not moaning - but I see that having the valve timing right IS a crutial step towards getting it spot on, don't you agree?

As is doing the basics.

Not disputing the basics make a difference -

But for the purpose of the question assume that is done, but the two cams are still slightly out.

Will half a tooth out make a noticable difference to either performance or economy,  in your experience, yes or no

[TheBoy]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

All in the plan - in fact, is what I was doing tonight

So stop moaning about economy until those basic steps have been done

Not moaning - but I see that having the valve timing right IS a crutial step towards getting it spot on, don't you agree?

As is doing the basics.

Not disputing the basics make a difference -

But for the purpose of the question assume that is done, but the two cams are still slightly out.

Will half a tooth out make a noticable difference to either performance or economy,  in your experience, yes or no

Slight difference, yes, but not enough to account for your economy.

[JamesV6CDX]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

All in the plan - in fact, is what I was doing tonight

So stop moaning about economy until those basic steps have been done

Not moaning - but I see that having the valve timing right IS a crutial step towards getting it spot on, don't you agree?

As is doing the basics.

Not disputing the basics make a difference -

But for the purpose of the question assume that is done, but the two cams are still slightly out.

Will half a tooth out make a noticable difference to either performance or economy,  in your experience, yes or no

Slight difference, yes, but not enough to account for your economy.

Thanks

In which case, once that's done, COMBINED with a full service, it should be somewhere towards better

[tunnie]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

All in the plan - in fact, is what I was doing tonight

So stop moaning about economy until those basic steps have been done

Not moaning - but I see that having the valve timing right IS a crutial step towards getting it spot on, don't you agree?

As is doing the basics.

Not disputing the basics make a difference -

But for the purpose of the question assume that is done, but the two cams are still slightly out.

Will half a tooth out make a noticable difference to either performance or economy,  in your experience, yes or no

Slight difference, yes, but not enough to account for your economy.

Thanks

In which case, once that's done, COMBINED with a full service, it should be somewhere towards better

Mixed 50 mile run, some sections in 3 figures, i averaged 27.6 in mother tunnies estate.

[TheBoy]

JamesV6CDX - before ripping engines apart, do the std service - fuel filters, ait filters, oil, breathers and so on.

All in the plan - in fact, is what I was doing tonight

So stop moaning about economy until those basic steps have been done

Not moaning - but I see that having the valve timing right IS a crutial step towards getting it spot on, don't you agree?

As is doing the basics.

Not disputing the basics make a difference -

But for the purpose of the question assume that is done, but the two cams are still slightly out.

Will half a tooth out make a noticable difference to either performance or economy,  in your experience, yes or no

Slight difference, yes, but not enough to account for your economy.

Thanks

In which case, once that's done, COMBINED with a full service, it should be somewhere towards better

I would have done it the other way round - a known good service that then gives you a baseline to start from.