Ugh..Broken TPS Bolt...now what? - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 13 Old 15th October 2011, 08:02 PM Thread Starter
cab
m5board.comoholic (>1000 posts)
 
cab's Avatar
 
Join Date: Sep 2008
Location: Grapevine, TX
Posts: 1,067
Thanks: 26
Thanked 168 Times in 114 Posts
Ugh..Broken TPS Bolt...now what?

Sometimes you are the hammer, sometimes you are the nail...

Ss part of my jerky throttle triage I decided to pull the two TPS sensors off, which of course meant battling the phillips head TPS screws. First side gave me some issues and I ended up have to dremel/chisel off the head of the bolt. Once the TPS was out of the way (slid off after that) I just unscrewed the threads....no biggie. Second side (left) was similar, first bolt came out OK, but second was was just stripping so I tried the dremel. Tighter fit this time and I just get a notch in it, so I decide to just whack the head off with the chisel like I did with the other side...cr*p - it broke alright - INSIDE THE THROTTLE BODY! Now I have three options:

1. Reinstall with just one screw - note I can tell it won't hold tight and will probably move around, probably not an option.

2. Pull the number 8 throttle body only and just extract it and/or retap as necessary - this requires disturbing what I am calling a "stop screw" (see pic). I could "count" the number of turns it takes to remove it and dupplicate when I re-install.

3. Pull all 4 throttle bodies on that side, leaving them "connected" to each other (if that is even possible) in order to avoid disturbing the throttle adjustment screws.

Here is the stop screw I am referring to (red arrow). There is one between each of the throttle bodies.



Any adice is greatly appreciated. I feel like my job is to fix my car, and my car's job is to stop me!
cab is offline  
Sponsored Links
Advertisement
 
post #2 of 13 Old 15th October 2011, 08:08 PM
leviathan
Member, Sport: On DSC: On (>100 posts)
 
leviathan's Avatar
 
Join Date: Feb 2011
Location: carrboro, nc
Posts: 113
Thanks: 0
Thanked 12 Times in 9 Posts
did it break off flush or inside of the hole? if inside, you'll have at least a few threads to screw into with a truncated bolt and loctite
leviathan is offline  
post #3 of 13 Old 15th October 2011, 08:14 PM Thread Starter
cab
m5board.comoholic (>1000 posts)
 
cab's Avatar
 
Join Date: Sep 2008
Location: Grapevine, TX
Posts: 1,067
Thanks: 26
Thanked 168 Times in 114 Posts
Quote:
Originally Posted by leviathan View Post
did it break off flush or inside of the hole? if inside, you'll have at least a few threads to screw into with a truncated bolt and loctite
flush (of course). I tried screwing the other bolt in there to see if it would catch even one thread...nope. :<
cab is offline  
 
post #4 of 13 Old 15th October 2011, 08:43 PM Thread Starter
cab
m5board.comoholic (>1000 posts)
 
cab's Avatar
 
Join Date: Sep 2008
Location: Grapevine, TX
Posts: 1,067
Thanks: 26
Thanked 168 Times in 114 Posts
Hmmm...after looking at the throttle bodies more closely, I don't think they are "connected" per say by the linkage, just positioned with intertwined linkage. Each throttle body's linkage has a tab that is "clamped" to the next by a spring loaded "stop" and the actual stop screw. I think can actualy slide the tab out (it would snap shut of course, w/o disturbing the set screw, but it might be a bear to reinsert it (space is tight). Option 2 seems to be where I am headed...will wait to see if anyone else has a suggestion.

Thanks!
cab is offline  
post #5 of 13 Old 15th October 2011, 08:44 PM
Burnout_187
Member, P500 Sport, DSC off (>900)
 
Burnout_187's Avatar
 
Join Date: Sep 2010
Location: Finland, Helsinki
Posts: 910
Thanks: 217
Thanked 193 Times in 122 Posts
Burnout_187 is offline  
post #6 of 13 Old 15th October 2011, 10:30 PM Thread Starter
cab
m5board.comoholic (>1000 posts)
 
cab's Avatar
 
Join Date: Sep 2008
Location: Grapevine, TX
Posts: 1,067
Thanks: 26
Thanked 168 Times in 114 Posts
Update to my own saga. All 4 throttle bodies are off - You can't really remove one as the giant avuuem tube that connects them all together prevents it. On the upside, it also keeps everything together. If I didn't already have all my fuel injectors out for cleaning, this would have been a huge pain. I had to drill the old bolt out, but I actually appear to have soem deeper threads left which I may be able to use...investigating a tiny heli-coil option now. Good times.

(p.s. needless to say, I will be giving the tb's a good cleaning while they are off).
cab is offline  
post #7 of 13 Old 16th October 2011, 02:49 AM
68FB
M5 Expert (>4000)
 
Join Date: Mar 2011
Location: Ontario, Canada
Posts: 4,488
Thanks: 477
Thanked 1,418 Times in 1,032 Posts
This is a good example of why I hate Phillips head screws! They are the reason impact screwdrivers had to be invented.
Just in case you need to replace the TPS's again (God forbid), maybe use Allen head screws?
68FB is offline  
post #8 of 13 Old 16th October 2011, 03:11 AM
jt2ma71
m5board.comoholic (>1000 posts)
 
jt2ma71's Avatar
 
Join Date: May 2009
Location: Vancouver
Age: 30
Posts: 1,782
Thanks: 28
Thanked 194 Times in 157 Posts
Next time break them loose with vise grips then use the bit to unscrew it. Trying to loosen it with the phillips becomes pointless because 90% of the time it just strips.

2003 E55 AMG - Obsidian Black/Black, Eurocharged ECU reflash, 84mm SC pulley, CM30 IC Pump, FTP Heat exchanger, Needswings Dual CAI, Custom exhaust, Forgestar F14's, Lowering links, E63 Spoiler, CF Front lip
2000 BMW M5 - Alpine White/Silverstone Extended Leather/BBS LMs 245.35.19, 285.30.19/Evolve Alpha-N/Tubi Exhaust/AA Intake/Ducts/Dinan Springs - RIP
2001 Yamaha R6 - Yamaha Blue, Yamaha GYT-R Exhaust, Factory Pro +4 Ignition Advance, Factory Pro Jet kit, 03R6 Airbox/Filter, Clear Alternates and fender eliminator, puig windscreen, Yamaha Solo seat, APE CCT
2000 Durango SLT+ - 5.9 V8, 3.92 LSD, 32x11.5 BFG All Terrains, Airaid intake, Hughes F1 Airgap, SCT Tuner, Flowmaster 50 Series, Fully rebuilt 46RE, 2" torsion lift
Glock17 9x19|Vz.58 7.62x39|Mossberg 500
jt2ma71 is offline  
post #9 of 13 Old 16th October 2011, 03:43 PM
nightkrawler
M5 Guru (>2000 posts)
 
nightkrawler's Avatar
 
Join Date: Apr 2007
Location: PA
Posts: 3,968
Thanks: 32
Thanked 581 Times in 435 Posts
as you've realized you cannot remove just one throttle, they have to come out as a set. might as well remove both sets and clean them, they get really cruddy. b12 chemtool spray and a toothbrush works really well for cleaning them. also a good time to clean the intake valves. with the throttles removed you have good access to them. take a look down there with a flashlight, im sure a lot of the valves are covered with carbon. manually rotate the engine so that the valves on the cylinder you're working on are closed. then spray some cleaner down there, i like castle hydroblast and the b12. also need something to scrape the carbon off with, use something made of plastic or hardwood, nothing metal.
nightkrawler is offline  
post #10 of 13 Old 16th October 2011, 04:53 PM Thread Starter
cab
m5board.comoholic (>1000 posts)
 
cab's Avatar
 
Join Date: Sep 2008
Location: Grapevine, TX
Posts: 1,067
Thanks: 26
Thanked 168 Times in 114 Posts
Quote:
Originally Posted by nightkrawler View Post
as you've realized you cannot remove just one throttle, they have to come out as a set. might as well remove both sets and clean them, they get really cruddy. b12 chemtool spray and a toothbrush works really well for cleaning them. also a good time to clean the intake valves. with the throttles removed you have good access to them. take a look down there with a flashlight, im sure a lot of the valves are covered with carbon. manually rotate the engine so that the valves on the cylinder you're working on are closed. then spray some cleaner down there, i like castle hydroblast and the b12. also need something to scrape the carbon off with, use something made of plastic or hardwood, nothing metal.
Yeah, once I saw how nasty this side was it is sort of hard not to justify doing both sides...in for a penny, in for a pound I guess.
cab is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW M5 Forum and M6 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Similar Threads
Thread Thread Starter Forum Replies Last Post
Broken Oil Filter Bolt Replacement getbent E39 M5 and E52 Z8 Discussion 4 2nd September 2010 08:48 PM
TPS? I can't see anything Elekta E34 M5 Discussion 4 27th April 2008 11:14 AM
TPS bad- car in shop- can I do tps sensors myself? Please help!! SatanicPanda E39 M5 and E52 Z8 Discussion 3 10th January 2008 01:21 AM
UGH - SUV Broken Into (long) :( dmcgibbo E39 M5 and E52 Z8 Discussion 4 7th August 2001 05:55 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome