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Old 12-14-2006, 04:52 PM
Old School Mechanic
Join Date: Dec 2006
Location: Auburn California
Posts: 127
EZL and R16 on 560SEL

Will some of you verify what I'm getting on a couple of your 560's? Let’s see what is normal and go from there.

Starting over, to clarify all I've learned trouble shooting a high timing and idle at 950rpm. And how R16 sets the timing. Background:The car idles smooth, 90 560SEL w/150k miles, passes CA smog emissions but not function because of the idle at 25 to 30 degrees advanced. I was steered to the EZL, TDC sensor, and R16. But no one seems to know how they work or how to trouble shoot them. So I soldered a 5K pot to banana plugs and rigorously (for me) checked all I could think of and took notes. So here is the low down on R16 and the EZL, at least mine.

Timing at ~30 car warmed up. Remove vac from EZL, timing drops to ~10. When I put the vac back on, timing jumps immediately to ~25 and in 8 to 10 seconds it goes back to ~30 and stays.

1) TDC sensor measures ~800 ohms engine cold (50 degrees F outside, California), ~1050 engine warmed up. I think its expected. Resistance in copper wire is heated. I expect a lot of windings in a magnetic pickup, so a fair amount of change. Reconnected sensor.

Below are all at idle in Park:
2) Removing vac drops timing to one of 5 steps set by 5 R16 ranges: 5ATDC, 0, 5 BTDC, 10 and 15. You can check three easily: R16 in (0, 5, or 10 BTDC), R16 shorted (5 ATDC), R16 pulled out (15 BTDC).
3) Re-applying vac at idle jumps the timing from one of the timing steps to ~25btdc then in 8 to 10 seconds later it jumps to ~30btdc.
4) From the R16 step, EZL timing advances smoothly as vac is increased from ~10lb vac down to ~40lb vac.
5) EZL timing jumps in steps as R16 goes from 0 to ~3k ohms. (That is the full range of my EZL response to R16 resistance change.)
4) EZL timing jumps in 5 timing steps of timing to 5 RANGES of resistance:
0 - 145 ohms ~4atdc
150 - 330 ~0 tdc
350 - 675 ~4btdc
680 - 3.0k ~10btdc
3.2k - 0pen ~15btdc

5) R16 must be available in 4 resistances around 100, 200, 512, 750, (and maybe 3.5k). Mine measures 750, it is color coded 750 and is part# 000 540 24 81 I think Bosch 09 8659 24. That is putting my timing at ~10 BTDC with no vac applied.

Now I wonder if the smog tech should have pulled the vac line to expect 0TDC. And my R16 would need to be ~200 ohms to get me to TDC. And, Why hasn't this come up on earlier smogs? I've set the timing to ~4 and taking my wife shopping with any luck we won't get there . I left the R16 original and its in the fuse box just in case
Please, will some of you verify what I'm getting on a couple of your 560's? Let’s see what is normal and go from there.


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Old 12-14-2006, 09:05 PM
wheeels's Avatar
Join Date: Nov 2004
Location: burlington on. can.
Posts: 19
1st check the fuse in youre ovp relay...(poss could have an issue with idle speed control unit as well --caution this injection /eng management will make you an alcholic,,,
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Old 12-14-2006, 10:57 PM
Old School Mechanic
Join Date: Dec 2006
Location: Auburn California
Posts: 127
Is that the one by the Master Cylidal with a clear top door with a fuss under it? I pull that fuse to turn the motor without starting it. That fuse is good. Wouldn't I not be able to start the engine if the fuse was bad?

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