E90 M3 throttle motor failure

Post Wed Mar 05, 2014 3:15 pm

Friend of mine has an E92 M3 with a throttle body actuator motor failure at ~60k miles.

Was just wondering if anyone had come across this before, I am told this is not uncommon but it does seem a little serious for a 60k mile car.

Cost for the job at the moment to do both motors is ~£2k.

Post Wed Mar 05, 2014 4:22 pm

I've heard its fairly common on the s65 Byron, along with coil packs

Post Wed Mar 05, 2014 6:48 pm

Yep, both those issues are common.

Throttle motors are also common on the S85 V10.

Post Wed Mar 05, 2014 7:36 pm

bss325i wrote:Yep, both those issues are common.

Throttle motors are also common on the S85 V10.

you're right barry,

my replacement engine came with a throttle motor already removed.
I used the throttle motors off my original engine, as according to info in the ecu, the original engine had only 3.5k miles on it. although it had been to max rpm 206 times !!........in only 3.5k miles

Post Wed Mar 05, 2014 7:39 pm

Gently run in then!

Post Wed Mar 05, 2014 8:17 pm

bss325i wrote:Gently run in then!

yeh,
no wonder it was f**ked

Post Wed Mar 05, 2014 8:51 pm

Had a customer ring today for an E92 M3 steering rack - it had been damaged by a conrod coming through the sump at high velocity.
Common problem on earlier ones, typical late model BMW crap. I'm sure the rot began to start when BMW bought British Leyland 20 years ago - they talked at the time of 'sharing technology'. They certainly did that alright.

Post Wed Mar 05, 2014 8:54 pm

There go my dreams of an e90 m3 in a few years time.

I'll stick to £20 throttle cables I think

Post Wed Mar 05, 2014 10:29 pm

Yes i have heard of a hand full of S65 engine failure, coincidentally all had been remapped.

Raised rev limit FTL.

Post Thu Mar 06, 2014 8:08 am

bss325i wrote:Yes i have heard of a hand full of S65 engine failure, coincidentally all had been remapped.

Raised rev limit FTL.

Indeed stressed engines don't need more stress added for a few meaningless hp and nothing stresses an engine like extra RPM.

Well good/bad to know about the motors, bit of a sting to do both but i am told that if one goes then both are suspect right?

Post Thu Mar 06, 2014 5:03 pm

bss325i wrote:Yes i have heard of a hand full of S65 engine failure, coincidentally all had been remapped.

Raised rev limit FTL.

It was a fault with the rods or bolts - the same issue that afflicted the early F10 M5. But yes, raising the rev limit of any high revving engine is just madness.

Post Thu Mar 06, 2014 5:55 pm

The early F10 M5 S63 engine suffered oil pump failure.

I remember cooper Thames ditton had one in that hadn't even been pdi'd and it needed a new engine!

Post Thu Mar 06, 2014 6:57 pm

bss325i wrote:The early F10 M5 S63 engine suffered oil pump failure.

Ah, that's okay then.

My bad, it was the E46 M3 that had rod bolt problems. But nice to know their tradition of launching cars with major engine problems is alive and well!

Post Thu Mar 06, 2014 7:01 pm

Yes early S54's suffered from rod bolt issues an early E46 M3's were recalled.

Interestingly Z3M's with the same engine and of the same age were not.

Post Thu Mar 06, 2014 9:07 pm

bss325i wrote:Yes early S54's suffered from rod bolt issues an early E46 M3's were recalled.

Interestingly Z3M's with the same engine and of the same age were not.

Iirc, lower rev limit and power output?

Saw a Y reg Phoenix yellow M3 today!

Post Fri Mar 07, 2014 8:38 am

The issue on the S54 was also prevalent to a lesser extent on the S50b32 as well was it not?
The knocking out of rod bearings and spinning of shells was/is down to the cap loosing proper compression with the rod due to the bolts being too close to their tensile limit.
Which again is why the S50b32 with a raised rev limit is most likely to throw a rod/spin a shell.

Did they not revise the rod bolts? A simple change that would have cured the problem outright.