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7 Series - E38 (1995 - 2001)

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Old 11-06-2012, 09:48 AM
Linseman Linseman is offline
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Location: MA
Join Date: Dec 2011
Posts: 8
Mein Auto: 740il

Car seems to lose power quickly when not accelerating. Even going down hill the car slows itself down. If I throw it in neutral, it will then pick up speed. Spark plugs and air filter have been changed regularly for what that's worth.

Could this possibly be a transmission problem?
Could the mass air flow sensor possibly need to be replaced?

Any input would be helpful.

Last edited by Linseman; 12-14-2012 at 04:45 PM.
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Old 12-02-2012, 08:55 PM
Gc740il Gc740il is offline
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Location: Essex county
Join Date: Nov 2012
Posts: 2
Mein Auto: 1999 740il
I have the same problem
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Old 12-14-2012, 04:31 PM
zachiepie zachiepie is offline
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Location: St. George, Utah
Join Date: Sep 2006
Posts: 793
Mein Auto: 1997 328is, 2001 750is
Mine actually does that too. I used to drive an ambulance with a Ford powerstroke body, and that truck did the same thing. Apparently those have the same transmissions (labeled differently) as the e38s.
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Old 12-19-2012, 10:22 PM
bmw2qnj2le bmw2qnj2le is offline
Location: TEXAS
Join Date: Jan 2012
Posts: 29
Mein Auto: 740i
Few days ago, my 2001 740i had the "TRANS. FAILSAFE PROG." display. My bimmer lost acceleration on the 1st gear. It accelerated slowly... I thought of low trans. fluid. In the Bimmerfest, some one explains due to the moisture/water condensation causing the electrical short that triggers the computer senses something was wrong with the trans. In the afternoon, my car drives normally without touching/fixing anything. Any inputs from experienced Bimmer would shed some truth!. Thanks in advance. BMW2QNJ2LE
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Old 12-20-2012, 05:50 AM
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joyism5 joyism5 is offline
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Location: USA
Join Date: Jan 2011
Posts: 1,271
Mein Auto: '99 740IL, K75RT
Originally Posted by bmw2qnj2le View Post
Few days ago, my 2001 740i had the "TRANS. FAILSAFE PROG." display.
Often, this message comes on, when the transmission module does not receive sufficient power/voltage. This could be due to damaged wiring, loose connection and even bad alternator/battery.
Any transmission failure/issue inspection should began with level, color and smell of the transmission fluid.

PS: NOT a transmission specialist.
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