Sputter/Hesitation between 3.5K-5K RPM
Thread Starter
Senior Member
Joined: Jul 2008
Posts: 290
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From: Toronto
BMW M5 + E55 AMG
Sputter/Hesitation between 3.5K-5K RPM
Only happens when flooring it on the highway in the above rev range. Feels exactly like fuel starvation. No codes, no lights. No issues when flooring in 1st or 2nd at low speeds.
Any ideas?
Any ideas?
Thread Starter
Senior Member
Joined: Jul 2008
Posts: 290
Likes: 0
From: Toronto
BMW M5 + E55 AMG
I also noticed this error on the first start up of the day today when it was below freezing. It only comes on when it is very cold outside.
However, I didn't see any wheel being lower than another or stuff blatantly indicative of airmatic strut failure. Moreover, once the car has warmed up, this error doesn't come back on start up. Ie. morning start = error. Drive for 5-10 minutes to warm up. Restart car = no error.
Thoughts? Is that the air compressor having an issue?
However, I didn't see any wheel being lower than another or stuff blatantly indicative of airmatic strut failure. Moreover, once the car has warmed up, this error doesn't come back on start up. Ie. morning start = error. Drive for 5-10 minutes to warm up. Restart car = no error.
Thoughts? Is that the air compressor having an issue?
Senior Member
Joined: Aug 2011
Posts: 304
Likes: 2
From: Atlanta, GA
2007 E63 AMG, 1991 NSX, 2007 Corvette
I had a similar situation a few years ago with the hesitation.
I was using K&N filters and believe it or not, that was the freaking issue.
All kinds of tests were run and finally they spotted the K&N's and pulled them and replaced them with the factory ones and it stopped and has been running strong since. Possibly the K&N's was letting too much air flow.
I never would have guessed it, Always thought the more air flowing the better !!!
Good Luck in finding the fix. stevieg
I was using K&N filters and believe it or not, that was the freaking issue.
All kinds of tests were run and finally they spotted the K&N's and pulled them and replaced them with the factory ones and it stopped and has been running strong since. Possibly the K&N's was letting too much air flow.
I never would have guessed it, Always thought the more air flowing the better !!!
Good Luck in finding the fix. stevieg
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Joined: Jun 2008
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From: Texas
2003 CL55
Check O2 sensors.
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
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E63 Biturbo, UPD Cold Air induction kit, UPD performance crank pulley and UPD adjustable rear suspension with ride height adjustment.
CL55 UPD Cold Air Boost kit, UPD 3000 stall converter, UPD 77mm SC clutched pulley and beltwrap kit, Custom long tubes, UPD crank pulley , UPD suspension kit, UPD SC pulley, Aux. HE, Trunk tank w/rule 2000 pump, Mezeire pump, UPD 5pc idler set, Aluminum rotor hats.
www.ultimatepd.com
instagram @ultimate_pd
facebook.com/ultimatepd
Thread Starter
Senior Member
Joined: Jul 2008
Posts: 290
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From: Toronto
BMW M5 + E55 AMG
Bump for some more info!
Tonight I did a few pulls and noticed the same symptoms.
However, it only happens when in gear. I can rev in neutral to redline no problem. It also feels like it's in the back end by the diff, not from the front of the car. It almost feels like there is a difference in the driveshaft spinning vs. diff spinning, and the car buckles every so slightly but surely and rapidly between 3700-4300 RPM - almost like a misfire.
Has anyone experienced this?
Tonight I did a few pulls and noticed the same symptoms.
However, it only happens when in gear. I can rev in neutral to redline no problem. It also feels like it's in the back end by the diff, not from the front of the car. It almost feels like there is a difference in the driveshaft spinning vs. diff spinning, and the car buckles every so slightly but surely and rapidly between 3700-4300 RPM - almost like a misfire.
Has anyone experienced this?
