[W126 Coupe] Off topic 190E 2.6

[Mister McGoo]

Iain;
 
Your crank may be at TDC, the spark timing absolute correct, and the fuel still being delivered fine.  But if the chain has jumped the valves will be way off (and likely done damage in the process).  Remove the valve cover.  Likely if there is a chain problem it will be obvious, plus there will be a TDC timing mark on the camshaft sprocket. 
 
-Bellamy
 


From: igunn at bmts.comTo: mbcoupes at mbcoupes.comDate: Sun, 3 Feb 2008 02:02:16 -0500Subject: Re: [W126 Coupe] Off topic 190E 2.6



I haven't removed the valve cover, but there's a reference mark and sensor on the harmonic balance that when at about "0" degrees, and I turned the engine over by hand with the plugs out until I got to TDC and the rotor is at he correct corresponding place. I did this on #1 piston.
So I have the engine @TDC for Piston 1 and the reference mark @ 0 and the rotor pointing to #1 on the cap. I guess the next thing is to pull everything and check all the reference positions. Doesn't make a lot of sense, that's why I keep thinking I'm missing something. When you read the original message, this was running and basically stalled, no noise, no nothing, it tried to start a couple of times and ran for a second  until it reached this stage. Damned puzzling.
Thanks, Iain

----- Original Message ----- 
From: Mister McGoo 
To: Mercedes Coupes Mailing Lists 
Sent: Saturday, February 02, 2008 11:34 PM
Subject: Re: [W126 Coupe] Off topic 190E 2.6
Iain; Question:  If there is one, have you checked a corresponding timing mark on the cam sprocket?  I have no experience with that engine but I can't imagine the chain jumping without valve/piston interference.  -Bellamy


From: igunn at bmts.comTo: mbcoupes at mbcoupes.comDate: Sat, 2 Feb 2008 15:18:48 -0500Subject: Re: [W126 Coupe] Off topic 190E 2.6


Hi Guys, me again. Changed the EZL and the crank sensor, still reacting the same, I'm obviously missing something big time. 
I have spark on all cylinders, I have fuel. Verified  that rotor is in correct position when piston @ TDC  #1
Anybody got any other ideas? 
One thing I'm looking for and haven't found yet is the R16 resistor, flat plug in unit. Manual says its near the EZL, can't see it. Other have said its near the battery??
 Problem is there are no competent MB guys within 100 kms of me even if I wanted to take it in to a shop.

 
Original Message 
Here's what happened: the car sat for a week and I went and started the car and it started and ran fine for about 25 minutes. I went to move the car , put it in reverse and the tires were frozen, gave a bit of gas and it stalled, would not start at that point. When it turns over it won't catch and it sounds like either its hydraulicing or way too much ignition advance. When I remove the coil wire it turns over normally.
I pulled the plugs, turned the engine by hand to TDC, as indicated by the markings on the harmonic balancer, #1 piston was at TDC and the rotor is pointing to #1 firing position. On the 190 the trigger for ignition is on the balancer, ( there's a proxy there with a pin sticking out of the balancer.)
Its sounds like a jumped timing chain, but this does not indicate so.
I have also inspected all the pistons for water, as 2.6's have a habit of blowing head gaskets, all OK. All cylinders are getting spark, I have fuel pressure. 
Last thing I did was pore some gas down though the throttle body and turned the engine over, it flashed back through the throttle body. This usually indicates, too much ignition timing or a jumped timing chain.
I'm now stumped. What else can influence the ignition timing? Back in the old days, you would back off the distributor, but as you know, this will not change the timing on these cars.

----- Original Message ----- 
From: Steve Lemberg 
To: Mercedes Coupes Mailing Lists 
Sent: Wednesday, January 02, 2008 11:08 PM
Subject: Re: [W126 Coupe] Off topic 190E 2.6

Ian,
 
In a word No, the EZL is what sets the timing.    You can test the initial timing with the EZL in place and see what it is, to confirm that the timing is off.   Any timing light will work if the coil is firing.    Initial advance on cranking I would guess to be about 15-20 degrees before TDC.    The other thing to check is the crank sensor, it should be ruled out as the cause.    Check the core to ground and shield, you should have open on both.   
 
Steve

----- Original Message ----- 
From: Iain Gunn 
To: Mercedes Coupes Mailing Lists 
Sent: Wednesday, January 02, 2008 6:58 PM
Subject: Re: [W126 Coupe] Off topic 190E 2.6

I cleaned up everything and still the same. I've ordered a EZL to swap out. 
In the meantime is there a way to turn the motor over by hand with the ignition on, the plugs pulled and test without any fancy equipment at what point the plug fires? Using test lights and multi meter?
    Thanks, Iain

----- Original Message ----- 
From: Steve Lemberg 
To: Mercedes Coupes Mailing Lists 
Sent: Saturday, December 29, 2007 1:17 PM
Subject: Re: [W126 Coupe] Off topic 190E 2.6

Ian,
 
The EZL controls advance and dwell functions.   As these cars age more issues arise with the electronic parts, I would also check the ground points near the battery for the engine wiring harness.   There is also a resistor for the EZL that limits the advance, this may have failed.   Clean the plugs, they may be gas fouled.    A timing chain skip on an inline engine is unlikely, not impossible but unlikely.
 
Steve

 
 
 
 





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