M5 in the workshop - some opinions please

[maxf]

I think I'm probably a victim of 'forum-fear' but I've booked my M5 in tomorrow for a checkover to see that all is ok as I've noticed some 'issues'...

There is a very occasional hesitation/flatspot when accelerating (3rd/4th gear, at about 3500 rpm) - its only happened twice, but was almost like turbo lag, or clutch slip (but without the rise in revs).

There is a lot of 'hunting' when cold - especially in reverse.

It is consuming around 1 ltr of cws for every 500 miles

Any opinons on what to 'encourage' them to look for? Its under warranty, but I have to pay for the checks initially.

Cheers collective,
Max

[stuh]

maxf said:

I think I'm probably a victim of 'forum-fear' but I've booked my M5 in tomorrow for a checkover to see that all is ok as I've noticed some 'issues'... There is a very occasional hesitation/flatspot when accelerating (3rd/4th gear, at about 3500 rpm) - its only happened twice, but was almost like turbo lag, or clutch slip (but without the rise in revs). There is a lot of 'hunting' when cold - especially in reverse. It is consuming around 1 ltr of cws for every 500 miles Any opinons on what to 'encourage' them to look for? Its under warranty, but I have to pay for the checks initially. Cheers collective, Max

MAF's?

Any rattling noise from the engine, or emmision light on?

[maxf]

No, no emmisions light. Some startup rattle, but nothing I'd worry about to be honest.

There is probably nothing up, I just wanted to be sure before I start a fairly speedy weekend at Le Mans.

Probably wasting my money getting it checked!

[hereward]

Mine hunts in reverse; it always needs more revs when reversing to stop it stalling.

[gibo993]

Hi Max

Just had my MAFS replaced as I noticed a slight hesitation, no massive difference just a bit sharper mid range.

Cheers
Grant

[dazren]

MAX

Any calls from the garage yet giving you an update?

DAZ

[gibo993]

What do you mean by wasting money?

They should check the car is OK if its under warranty it should cost you zip

If it rattles on sartup useses loads of oil and hesitates in midrange.

It has to be Vanos or MAF sensor and they have to check these for free don't let them squeeze money out of you

[fixedwheelnut]

I take it it's the later V8 M5, there are some oil seal O'rings on the Vanos that go and this allows oil into the inlet manifold, get them to wip the top of the inlet manifold if it's full of oil then check the Vanos seals

[maxf]

Well, apparently I have a faulty coil which is causing the occasional flatspot - a missfire apparently.

The oil consumption is down to two leaking gaskets - a rear engine gasket and a rocker cover gasket (I've never seen oil on the drive - but they say it will be leaking into the undertray!).

Both items are covered under warranty, thankfully! I'm not sure what I think about the 'oil leak' - sounds like BS to me, but I'm not a mechanic!