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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-28-2015, 02:21 PM
Champ51 Champ51 is offline
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Location: St. Paul, MN
 
Join Date: May 2010
Posts: 4
Mein Auto: 2002 530
Another no-start after CCV - solved

This post is thanks for all the wonderful threads which helped me do the CCV and all the ancillary procedures.

After CCV, Spark Plugs, VCG, OFH gasket, Alternator duct, and Cooling System replacement, I had a crank/no start condition and my Peake showed the code for a bad motorized throttle sensor (aka TPS, MDK, EDK, or Throttle Housing Assembly). Not receiving an answer here on how to test, I ended up disassembling ala ASCOTT and chased wires inside. Discovering a probable bad potientometer, I replaced it and tested the new one. My results at the end of the thread.

After the new throttle was installed, I still had no start. The car had great spark, wonderful fuel pressure and very low compression. Only 15psi after 6 compression strokes for the first 3 holes. Gauge was tested on another vehicle and got 130psi on another cold vehicle. Jacked the right side of the car up to get close to level and soaked the top end with 3 fluid Oz. of Marvel Mystery Oil in each hole for 4 days.

After scavenging out the MMO which had not drained past the rings, wet cold compression averaged about 60 psi. About 6 fl oz of the 18 entered came out the top, with cylinders #2 & 6 having drained completely. But the car started immediately and showed great performance.

As noted above, the only information I could not find on this forum was the resistance readings across the 6 pins of the throttle position sensor. Very clearly from ASCOTT's picture of a disassembled sensor and from my test results, pins 3 & 5 are for the throttle motor. Beyond that I conjecture that pins 4 & 6 are one of the pots since because on my old sensor the resistance didn't change for open vs closed, but the new sensor does. Whether that leaves pins 1 & 2 for another pot, I don't know. Here are the results for all permutations of pin connections.

Pin #s closed open difference
1 2 1409 532 877
1 3 inf inf
1 4 1690 1666 24
1 5 inf inf
1 6 762 1360 -598
2 3 inf inf
2 4 558 1247 -689
2 5 inf inf
2 6 951 951 0
3 4 inf inf
3 5 3 2.5 0.5
3 6 inf inf
4 5 inf inf
4 6 1186 426 760
5 6 inf inf

All readings in ohms. "inf" stands for infinite. The readings for my old sensor were very close, no more than 12% different for all except between pins 4 & 6.
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  #2  
Old 10-28-2015, 02:42 PM
edjack edjack is offline
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Location: San Jose, CA
 
Join Date: May 2007
Posts: 12,229
Mein Auto: '97 540i 6 speed
Thanks for the feedback!

Good diagnosis.
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Ed in San Jose '97 540i 6 speed aspensilber over aubergine leather. Build date 3/97. Golden Gate Chapter BMW CCA Nr 62319.
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  #3  
Old 10-28-2015, 02:46 PM
DesertE38 DesertE38 is offline
Account closed at users request
 
Join Date: Oct 2015
Posts: 75
Mein Auto:
I read this twice...Missing something....Does it run now?
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  #4  
Old 10-28-2015, 07:24 PM
Champ51 Champ51 is offline
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Location: St. Paul, MN
 
Join Date: May 2010
Posts: 4
Mein Auto: 2002 530
I thought paragraph 4 was clear enough, but yes it runs now as well as it has for the past 160k miles.
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  #5  
Old 10-28-2015, 07:57 PM
DesertE38 DesertE38 is offline
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Join Date: Oct 2015
Posts: 75
Mein Auto:
Told ya I was missing something....There its hiding...
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