Extremely brief loss of power - BMW M5 Forum and M6 Forums
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post #1 of 3 Old 21st June 2018, 05:00 PM Thread Starter
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Extremely brief loss of power

Yesterday I put a couple hundred miles on my M5. On my way home, shortly after I fired up the car (engine still warm, trans in neutral), there was what felt like one brief misfire--the engine RPM dropped slightly for a split second and I could feel a slight shudder, but it recovered immediately.

Then, twice on the 120-mile drive home, cruising at around 3500RPM on the interstate, there was a split second loss in power. It felt like I took my foot off the throttle and then immediately reapplied it back to the same position. The two times it happened were not back-to-back--they were probably 30ish minutes apart. One time I was using the cruise control; the other time, I had my foot on the accelerator.

The rest of the drive was uneventful; engine power and drivability feel normal.

It's an '08 6-speed with 48K miles on it, and so far has been trouble-free. What does this sound like it might be? Throttle actuators?

--'08 M5 - 38K miles, 6-speed, Interlagos Blue, muffler delete, RPI scoops, charcoal delete
--'04 Mustang Cobra, bolt-ons, ~460rwhp (blower upgrade and 600rwhp coming soon)
--'08 Buell 1125R, '14 Yamaha Vmax, '05 Triumph Speed Triple, '03 Suzuki DRZ-400E
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post #2 of 3 Old 21st June 2018, 10:53 PM
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Interestingly, I believe I've experienced the same thing. 2008 6 speed as well. It occurs randomly and not very often...like once a month. Only time I've noticed it is at cruise on highway where it skip a beat (as does my heart!).

110000 miles and no ill effects. Been doing it for years...
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post #3 of 3 Old 24th June 2018, 08:27 AM
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Never had that happen on my 6 speed, and she’s been my daily for the past 130,000+ miles.

The only thing I recall “wonky” is when my voltage regulator was going out — I had my speedo/gauges flatline, then come back up.

BTW...I just sent my e60 away for my second set of rod bearings and a refresh of the little things, while I’m out of town for a couple weeks.


///M The ///Most Expensive Letter in the Alphabet
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s85 + (afterthought) 6mt =162,000 miles with no RCOD and counting ...just saying...

2007 Dinan S2 e60 m5 6MT Interlagos Blue; DINAN 3.91 Exploded @8x,xxx ; Performance Gearing 3.91 LSD 3 clutch, 30/50 ramps, R&P polished ; ClutchMasters FX350 clutch and LTW single mass FW @157,000 miles, RPi Oil Cooler/Scoops; DINAN High Flow Air Mass Meter/Intake, DINAN TBs, DINAN pulley, DINAN strut, DINAN Monoballs, FastAttack Tune, w/Kung Fu grip!, Einhorn Industries Race Jedders, track pipe, and x-pipe; DINAN Section 3, DINAN LTW 19x9 ET18, 19x10 ET25, Michelin PS4S 275/35/19 and 305/30/19, Macht Schnell 15mm spacers (front); FERODO FRP3000H race pads; StopTech BBK 6/4 380mm/35mm x 380mm/32mm w/SS lines; RDSport F/R sways; MCS 2WNR motorsport coilover, -2.0/-2.5 F/R camber; z3 1.9L SSK, with f10 shifter; F/R G1W-H; Uniden R1, remote ALP 2Rx:1Tx, F/R NetRadar DSP, w/GPS and BT. SprintBooster v3; Euro MDM and DSC off. Fluids: Motul 7100 4T 10w60, Redline ShockProof Lightweight 75w140, Castrol SRF, Unicorn Jizz and Wolfpack Blood; Rod bearings replaced at 84,000 and 150,000 miles!!!

1988 e28 m5 STROKER 420bhp 91 octane(Paul Burke s38b39); VAC LTW flywheel; MegaSquirt G2 DME; Nuke Performance fuel rail and pressure regulator, Carbon Fiber CSL intake; Lifeline Zero 360 FIA 3.0kg Novec fire suppression; Cool Shirt Pro Air/Water system; Euro RestoMod track car: caged, 6 point Schroth FIA harness, FIA Sparco Ergo & Sabelt GT-160 seats...AC/heater, interior, sunroof, rear seat delete; Euro Headers, dump valve, and race cats; CAE Ultra shifter; custom Ground Control Coilovers/camber plates; Mason Engineering front/rear strut bars; Brembo 6/4 BBK; 17x9 BBS Style 42 w/Michelin Cup 2; undergoing Euro restoration, building the e28 CSL ///Motorsport never built. 5.71lbs/hp

Not-spec e30 racercar!!! Fully caged for wheel 2 wheel racing

1996 FZJ 80; LOCKED; Factory TRD Supercharger; Expo/Overland/Backcountry Rig; custom sleeper/drawer system, full rock armor, 33"s on 2.5" OME Heavy Lift; Rigid LEDs F/R; 231,000 miles and counting.
2008 Audi A3 S-Line Quattro w/flappy paddles (Mammoth Mountain Commuter)
2000 e39 m5 TiAg (Gone, but not forgotten) sold 7/2014.

The Indys that I trust for all my Beasts' needs: oceansidemotorsports.com my local physician for service
fastattackmotorsports.com because JColley!
einhornindustires because WolfPack!

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