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Car does not want to accelerate, check engine lamp on.

Tiny
KBAKER069
  • MEMBER
  • 1997 BMW Z3
  • 66,800 MILES
I have a 1997 BMW Z3 that when taking off it has to be between 1500-2000 rpms or it will sputter and die. When it happens if you push the clutch in and rev the motor for about 5 minutes it will idle fine. Also when driving it will hesitate and sputter when driving at a steady speed, if you accelerate or decelerate it will run fine. Sometimes when you start it it will start and die, sometimes it starts fine and will idle all day smooth with no problems. I have done a complete tune up(Plugs, filters, clean throttle body), replaced the M.A.F, and replaced S1 o2 sensor.
the codes are as follows:

P0301
P0306
P0302
P0300
P0303
P0305
P0304
P0170
P0101
P1188

Those codes appeared before and after I did the staed repairs to the vehicle. Also the car sat for approx 9 months before I got it so I drained the fuel and filled the car with premium and added Lucas fuel stabilizer. I am getting ready to flush the injectors and thinking about replacing the C.C.V. Any help would be appreciated. Hank you in advance.
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Monday, August 29th, 2011 AT 12:26 AM

11 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
P03xx codes are all misfiring codes.
P0101 is a fault with the Mass/Volume Air Flow Circuit Range Performance.
P0170 = Fuel Trim ( Bank 1)
P1188 = Fuel Control.

From the trouble codes, I believe the MAF circuit is the one causing all the problems. I could not find any detailed diagnostic procedures for the trouble codes in our database and testing requires special scan tools.

Was the MAF replaced new or used and is of the correct part number?
Have you checked for vacuum leaks between the MAF and throttle body?
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Monday, August 29th, 2011 AT 1:56 PM
Tiny
KBAKER069
  • MEMBER
  • 6 POSTS
The M.A.F. Was replaced with a new unit and I have check for vacuum leaks between the air box to the throttle body. I have a snap on solus at my disposal so if you need any readings let me know.
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Monday, August 29th, 2011 AT 2:17 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Send the last 7 of the VIN so we can ID the car.
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Tuesday, August 30th, 2011 AT 11:03 AM
Tiny
KBAKER069
  • MEMBER
  • 6 POSTS
V.I.N is LC09015. Sorry it took so long to reply as I had to deal with a funeral and such.
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Tuesday, September 6th, 2011 AT 8:43 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Are you still with us? The issue could be several things, I would need to see short and long term fuel trim and live data for the air mass.
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Friday, October 7th, 2011 AT 3:22 PM
Tiny
KBAKER069
  • MEMBER
  • 6 POSTS
How do you want to see the data. Vehicle at an idle or while driving at any certain speed? Or maybe even both?
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Friday, October 7th, 2011 AT 3:27 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
Idle for the kg/hr of air through the air mass, STFT and LTFT numbers as well.
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Friday, October 7th, 2011 AT 7:56 PM
Tiny
KBAKER069
  • MEMBER
  • 6 POSTS
At idle cold start.
STFT 0.0%
LTFT 0.0%
MAF 5.46G/S
ECT 100 DEGREES F
IAT 73 DEGREES F
Timing advance 15-16.5
O2 B1S1 .075
O2 B1S2 .740
Load 0.0%

After 10-15 minutes of idle

STFT 28.1%
LTFT 0.0%
MAF 4.27G/S
ECT 169 Degrees F
IAT 102 Degrees F
Ignition timing advance 14.5
O2B1S1 .085V
O2B1S2 .490V
Load 0.0%
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Friday, October 7th, 2011 AT 8:29 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
There is definately an issue with the air mass, those numbers should be much higher. Check for intake vacuum leaks, smoke is the preferred method.
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Friday, October 7th, 2011 AT 9:16 PM
Tiny
KBAKER069
  • MEMBER
  • 6 POSTS
I will do that on Monday and let you know what I find. Thank you!
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Friday, October 7th, 2011 AT 9:28 PM
Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
K
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Saturday, October 8th, 2011 AT 10:56 PM

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