560 Dist Timing - PeachParts Mercedes-Benz Forum

garymand · #1 12-11-2006, 04:14 PM

Failed CA smog functional, crazy but passed the emisions gases with flying colors (and I have an aftermarket Cat). timing ight says 30btc. It moves up to 40, but I don't know how to bring it down to TDC.

Details: Failed idle rpm at 942, had a boken hose to the EGR (fixed that), idled at 942, and gas cap doesn't vent right (Can replace that: removes with a swoosh of, I think, pressure, could be vacuum, not sure.)

I think the idle will come down with the timing.

Looked into the dist: Is this right? only has one spring and a bushing on the inner tang where the second spring would go. No bushing on the weight tang. No debre, no spring, no marks or damage that a broken spring might cause.

Gary

jhodg5ck · #2 12-11-2006, 04:24 PM

did you time it w/ or w/o vacuum on the EZL? Timing is only variable via the R16 resistor. Pull the vacuum and re-test @ idle.

Your idle is most likely a vacuum leak somewhere or a sticky air idle valve.

Search rough idle etc and I'm sure you find Lots of info here, BW and MBC's.

Jonathan

garymand · #3 12-11-2006, 04:32 PM

EZL? Where is it, what does it look like.

When I pull the vacuum the timing should retard?

I'll check rough idle...

Looks like you are having fun with 560SEC's! I've been told I should cut the resonators out befor and after the 90* bends and replace with straight pieces. Gives better power, mpg and not much noise, just a nice V8 sound. Any input?

Gary

jhodg5ck · #4 12-11-2006, 06:23 PM

The EZL is the ignition control unit..it's on the drivers side fender well. Has two 4 pin plus, 1 vacuum plug and one 1 pin plug.

Yes, w/ the vacuum advance removed timing will retard.

I have fun w/ all my Mercedes...they keep me happy

Yes, removing the kidney beans as I call them is a good way to open the exhaust up some. Should see minor hp/mpg gains. Adds a bit of throatiness as you mentioned which is nice when you have a V8 under the hood.

Jonathan

garymand · #5 12-11-2006, 07:15 PM

I found the EZL. pulled the vac and idle dropped to ~750 from 950. I did't look at timing change. What's next?

jhodg5ck · #6 12-11-2006, 08:04 PM

what is it you are trying to change? I thought you attempting to check your timing and fiddle with it..

Pulling your vacuum advance and getting a lower idle is odd.. Have you adjusted the CO on your car?

Jonathan

garymand · #7 12-11-2006, 08:12 PM

The timing is 30 at idle! I need to get it to TDC. I don't know how to change it.

This may be of no consequence but I just remembered I replaced the water pump a year ago and R&R'd the distributor. Could it be off by one tooth?

jhodg5ck · #8 12-11-2006, 08:22 PM

Umm...yes, it looks to be... time to re-set your dist.!

I think you'll find your power and economy will come back significantly!

Jonathan

garymand · #9 12-11-2006, 08:30 PM

I just checked timing. It started and settled to 20. First time I've caught it there and the idle was a little lower. pulled zacuum to the ELZ and rpm fell and timing too, to maybe 5*. Repeated 3 - 4 times and noticed rpm climbing and timing came back uo to 30 from 20. took maybe a minute total with the change taking maybe 10 15 seconds. Like something warmed back up. The car had cooled slightly from a short few mile trip to the post office.

garymand · #10 12-11-2006, 08:53 PM

Haven't changed CO, measured .o1 at 2500 and .04 at 942.

Is there only one spring in the mechanical advance??? Anyone know??

I'll check the distributor position. I'll rotate crank to get distributor to #1 & mark on lip. And see where the crank is. Then get the crank to TDC and see where the distributor is. "Mark twice cut once."

jhodg5ck · #11 12-11-2006, 09:01 PM

yes, only 1 spring. Your car should have an initial timing of 3-4 degrees @ idle w/ the vacuum removed.

Where is your distributor set? Is it in the middle of it's adjustment or it is cranked one way or the other?

Jonathan

garymand · #12 12-11-2006, 09:04 PM

Its about in the middle. Rotating either way even all the way made little/no change.

Where do you connect a remote starter switch? I knew where on my 380, but can't find where on the 560.

jhodg5ck · #13 12-11-2006, 09:25 PM

it makes no change to your timing..timing is controlled via the R16 resistor.

Can't say I use a remote started on my 560's..besides, there's always someone to turn the key for me.

Jonathan