[W126 Coupe] Wavering High RPMs...fuel dist? Fuel Pump? '85 500 SEC

[dick.spellman@gmail.com]

Fuel pumps could be weak.  Can you set up gauges and watch for pressure drop at wot under load

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----- Reply message -----
From: "Stuart Dangar" <stuart.freeride at gmail.com>
To: "Mercedes Coupes Mailing Lists" <mbcoupes at mbcoupes.com>
Subject: [W126 Coupe] Wavering High RPMs...fuel dist? Fuel Pump? &apos;85 500 SEC
Date: Sat, Apr 16, 2011 10:13 am
Hello,
 
I will try to mention everything just incase they all tie into my issue.
 
Did some work this past month... machined heads, rebuilt top end, new chain, guides, water pump, thermo. didn't do oil pump (should have), plugs, air control valve, idle computer,some new fuel lines where they were needed, distro cap, fuel filter. I also fixed some vacuum issues so now my headlights adjust, and hvac works better, replaced mono valve, still need to replace hvac vacuum pods.

 
Fuel pump is rattling rather loud like a ball bearing rattleing which I am accustomed to hearing on my other two SECs but just not this loud.
Just finished replacing all front end linkages...tie,idler,pitman,control arms... the hole kit and kaboodle before installing revalved hd shocks, h & r s. and tighter sway in back if possible.
 
Was about to buy and refab some RS90 lorinsers, and finish the catless pipes when I realized i might need to troubleshoot this problem first.
 
When I engage the kickdown solenoid and the RPMs kick up it seems like she is starving at the top end. If I get within about 1800-1500 of redline she starts to act like she is starving for fuel. she starts to waver rpms before the gear shifts back down....

 
Any suggestions are greatly appreciated. I was going to do the fuel pump soon when I do the head back pipe rebuild, but might need to focus on fuel distro if y'all think that may be the problem.
 
As soon as I get all this done I am going to revalve and and put some moded camshafts in if I can find an indie shop here in Atlanta willing to work with me. Any suggestions here would be welcomed as well. Or if someone has AMG top end they would like to part with.

 
Can't wait to finish her as the '91 Euro SEC Color 199 RS129 swap is next.
-- 
Stuart Dangar
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