Author Topic: Warm starting  (Read 4889 times)

reggie

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Warm starting
« on: April 28, 2011, 09:17:57 »
My 1970-280SL, Starts great when cold, When i go for a drive, which is quite a lot recently, And leave it 30 minutes, it take a lot of turning over before if fires up, leave it 5 minutes it starts right up -  ??? , I have read through the tech manual, nothing jumps out at me, Other than that, Its been great driving about in it,  ;D Help.
1969 280 5 speed zf 180g

thelews

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Re: Warm starting
« Reply #1 on: April 28, 2011, 12:54:15 »
I have a similar situation.  Try different ways, no throttle, half throttle, full throttle when cranking.  I can't remember which works best for me.
Enjoy some pictures at this link:
http://www.flickr.com/photos/8292359@N06/sets/72157603240571101/show/

John - Wisconsin
1967 Early 250 SL Red/Caviar, Manual #1543
1961 190 SL 23K miles
1964 Porsche 356
1970 Porsche 911E
1991 BMW 318is
1966 Jaguar XKE
1971 Alfa Romeo GTV 1750

ja17

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Re: Warm starting
« Reply #2 on: April 28, 2011, 12:56:03 »
Hello reggie,

Check the basic first.  The main fuel filter should be clean. The ignition points (dwell) should also be checked.

Next you should check your basic starting aids with a12 volt  test light or a meter. During hot starts the fuel enrichment solenoid (Starting Solenoid) on the injection pump should activate anytime the starter is engaged. Let us know what you find.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

Ulf

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Re: Warm starting
« Reply #3 on: April 28, 2011, 13:45:06 »
Mine has a somewhat similar issue - it fires up instantly when warm, but dies out immediately without a blip of the throttle, it mostly only fires up on 5 cylinders when warm and the 6th usually joins the party within 10-15 seconds...
1965 230 SL in silver (DB180)
1982 Land Rover Series III SWB
2008 Jaguar XF 3.0
2005 Mini Cooper

reggie

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Re: Warm starting
« Reply #4 on: April 28, 2011, 16:49:35 »
Thanks Joe.
Checked all the basic's before i asked, Just tried with the test lamp, nothing there, Its a black wire with a red tracer, looked in the fuse box, No 7 it says, fuse ok, same one for the heater blower, which works ok, checked the fuse behind brake booster, LHD, thats ok, differant coloured wire though, Are there anymore fuses to look at.  ???
Thank you.
Reg
1969 280 5 speed zf 180g

wwheeler

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Re: Warm starting
« Reply #5 on: April 29, 2011, 02:58:06 »
Reggie,

I am dealing with a similar issue except I am getting TOO MUCH fuel when starting. Cold starting is great, but warm starting can be embarrassing. With the starting solenoid wire connected, I get too much fuel and the engine stalls immediately after firing. I have to press the throttle after it fires to keep it alive. With the solenoid wire disconnected, it fires up after a one or two seconds and NO pedal action required. 

Being an engineer, I can't stand to leave the wire disconnected. I am slowly shortening the length of the solenoid rod until I hit that happy median. It has taken a lot of on and offs with the solenoid, but it is getting better. It might be some other hidden problem, but I can't find it.

I think a lot of people have warm starting problems with these cars and each person has their own way of dealing with it. Keep after it!
Wallace
Texas
'68 280SE W111 coupe
'60 220SE W128 coupe
'70 Plymouth Roadrunner 440+6

ja17

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Re: Warm starting
« Reply #6 on: April 29, 2011, 05:19:25 »
Hello Reggie, 

Your relay is most likely not working if you are not getting anything to the solenoid.  Not sure which one is the culprit on your car. Pull the plug off the bottom of a relay. You will see numbers  cast in the plug next to each hole. #87 is the out going power. Just touch a jumper wire to the #87 and see what device activates. When you get to the relay which operates the injection pump solenoid, remove the cover and clean the points inside. Before you put the cover back on, try starting the car and check to see if the IP solenoid is now  working when the starter is engaged.
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback

reggie

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Re: Warm starting
« Reply #7 on: April 29, 2011, 06:51:09 »
Thanks, Joe & Wallace, I will keep you informed,  ;D
Reg
1969 280 5 speed zf 180g

reggie

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Re: Warm starting
« Reply #8 on: April 29, 2011, 11:12:41 »
Well, I have come to the conclusion i dont have a starting device,  ::) My car must be the later type, it has all the emissions gear still on, So what i have been testing, is a fuel shut off valve,  :-[, The one on the intake manifold is working fine, Must be pilot error, Or is there something else that may help warm starting,  ???

Reg
1969 280 5 speed zf 180g