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#1
06-04-2006, 06:23 PM
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95 E320 M104 poor idle and flat spot
Hi, I have the above problem - flat spot is around 3,500 RPM and then picks up and flies at 4,000 RPM and above. Idle speed is steady but misfiring (only when hot).
Car is new 2 months ago to me but dealer records show harness replaced 2003, O2 sensor and MAF 2004. Also coils replaced plus ECU coil output stage rebuilt by local inde late 2004). The OVP is the old part number but appears OK (fuse, contact and soldering all fine, voltages measure OK)? I did the B service plus all fluids and replaced plugs and boots. Also read the codes and fixed a broken knock sensor lead which improved things a lot but, having driven another E320, this one ain't right! (swapped MAFs with this one and reset adapt - no change). No codes from the reader now. Cleaned and checked throttle flap, intake temp sensor, resonance flap clear and moves with vac. Cleaned up and checked fuel vapour recyc system (valve clear and "beats" OK, cleaned by Arthur D's WD40 method). Can't find any vac leaks. Please advise what to check/look at next.....thanks!
__________________
Regards, Steve ------------------------------- 1995 E320 Coupe (125.052 104.992 722.369) 
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#2
06-04-2006, 06:30 PM
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I forgot to say the car does not have EGR and has the cable throttle (linkage all checked and adjusted OK as per the CD).
__________________
Regards, Steve ------------------------------- 1995 E320 Coupe (125.052 104.992 722.369)
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#3
06-04-2006, 06:41 PM
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What are you using for plugs?
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#5
06-04-2006, 06:48 PM
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Pull the vac hose off the fuel regulator and see if there is any fuel evident there..
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#7
05-28-2009, 01:58 PM
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i know its an old thread, but on my 36 amg M104 i have the same flat spot at 3400 and then its fine at abt 3700 rpm.
I have changed the resonance flap, its relay (is that the OVP) and have changed the electronic throttle along with full service. so what is the ovp and how can it affect the faltsopt?
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Jay, ----------------- -1995 Blue W202 C36 AMG (M) SOLD ;( -1995 Black W140 S500 (Lady) -1992 Black W124 E300 (Dima) (Ex-Mosselman Twin turbo Kit). -1988 Black W124 300 E 4-Matic.(Nadeen) -1983 Brown W126 500SEL.(Old Lady)(Sold) -1981 Gold W123 280CE.(Dareen)(Sold) http://www.youtube.com/user/jayrasheed 
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#8
07-26-2010, 10:44 PM
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I guess it's my turn to revive this old thread.
 My dyno guy is trying to diagnose some issues with the aftermarket ECU connected to my engine. Can someone please post a pic which shows where the connections are for the intake resonance flap and variable valve timing on a 3.2L M104 HFM engine? Not sure if they're electrical or vacuum operated. Do they both use a simple on/off signal? Thanks!
__________________
1989 300CE "Project HWA124" (400rwhp Turbo Technics AMG C36 engine) 
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