190E (W201) 1982-1993: 190E 2.3, 190E 2.6, 190E 2.3-16, 190E 2.5-16, 190 D 2.2, 190 D 2.5, 190 D 2.5 TURBO, 190E 2.5-16 Evolution I, 190E 2.5-16 Evolution II

1990 w201 2.6 will not start

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Old Feb 2, 2008 | 04:23 PM
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Thguns's Avatar
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From: Rivers, Manitoba, Canada
2009 Mercedes C63 AMG, 2013 Mercedes C350 4Matic Coupe. 2012 GLK 350 4Matic
1990 w201 2.6 will not start

Perhaps someone can give me some insight into this?
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 reference 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.
What i have done
Changed the EZL and the crank sensor, rear of engine, cleaned all grounds, 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.
Thanks, Iain
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Old Feb 2, 2008 | 07:32 PM
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From: Sugar Land Texas
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timing is controlled by the ezl, the crank signal tells it when to fire, I`ve seen the flywheel cause that but only after someone has had it off to do a rear main seal, you might want to check the exhaust to make sure it is not clogged, you can pull a o2 sensor out and try and start it
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Old Dec 30, 2008 | 10:35 PM
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1988 190e 2.0 litre
Did you ever get the timing issue resolved Iain?, sounds very much like the problem I have with my 2.0 190e. I can get it started but only with the timing retarded (older ajustable distributor) but then it runs bad, set the timing and it runs great, just wont sart again !! Steve
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