Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 02-16-2000, 10:29 PM
Posts: n/a
Hello, I just replaced my tach in a 76 450 se, the tach shows 2k at idle, when I rev up the engine it goes to 3k then comes back down to 2k. the needle does not bounce around. When I turn on the ignition, the green wire going to the top postshows about 7 volts and the black and red wire has no power. Is that correct.
Reply With Quote
Old 02-18-2000, 01:37 PM
Registered User
Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Does it just go between 2000 and 3000 or does it go above and below, i.e, if you rev the engine is it possible to go above 3000 rpm or does it just stick there? Does it drop below 2000 rpm when you engage the tranny and prepare to move on. I guess what I am saying is that if neither of the above occur, then your tach head is either incorrectly wired or it's fried. Is the seven volt reading with the engine running or with the key on w/o running engine. Need more info.. BTW, what is your idle speed set at??? ;

Jeff L
1987 300e
1989 300e
1987 BMW 325

[This message has been edited by jeffsr (edited 02-18-2000).]
Reply With Quote
Old 02-19-2000, 12:59 PM
Posts: n/a
rpm will drop to 17k, idle set at 830. Tach shows 3500 while crusing at 70mph. Tach will go higher. It just seems to read double what engine is doing at idle. When accelerating tach while jump to 4k and then settle in at 2500, If i rev up the engine, tach will go up after releasing gas pedal. Thanks
Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
What books are you reading now? vanakin Open Discussion 82 06-08-2007 01:38 PM
What are you reading? fahrgewehr2 Open Discussion 35 03-15-2004 04:12 PM
Slow response of S500 ambient temp reading Cricket Tech Help 4 05-29-2003 08:08 PM
X11 Port Reading Correct? chicago124 Tech Help 5 03-06-2003 07:38 PM
Low engine oil reading Robin Teo Tech Help 7 03-10-2002 12:03 PM

All times are GMT -4. The time now is 03:10 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page