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Old 04-16-2006, 02:07 AM
Registered User
Join Date: Jan 2006
Posts: 97
89 560 SEC Died in a parking lot Please H E L P !

Hi All,

Is there someone that can help me so I can get my car home?
I just went to the library to drop dvd's in the drop slot @ 1AM and my 89 560 SEC would not start and I had to walk 2 miles.
The tank is full.
If I held the pedal to the floor it would start for a second then quit.
Then it would start with no gas held for the count of one. I actually had to start it a few times, foot floored and when the revs were high pull it as it cut out into R so I could get it into a parking spot that wouldn't get the car towed. (I know that is not good for the tranny, I had no choice). I couldn't keep it running.
I want to shoot over there today (Sunday) what can I look for? I did hear the fuel pump and it did start for a second when the pedal was floored (I know flooring it bypasses things in the injection system when it is flooded) but it would cut right out. I tried starting it for about 15 minutes.

Thanks and Happy Easter
1980 450 SL
1989 560 SEC

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Old 04-16-2006, 10:28 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Sounds like you might have a giant air leak. They happen on that motor from broken booster vacuum check valves and loss of a capping plug from a large unused pipe midway down the intake passenger side. Those would be the easy ones to see.

The conclusive evidense is to remove the airfilter and have some one crank the motor while you gently press the airflow meter flap down. If there is no pressure on the flap, then you have a fuel pressure problem. If pressing it down starts the car and the motor races, it is because unmetered air is entering and when given appropriate fuel the engine runs the speed corresponding to the amount of air entering.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 04-16-2006, 02:17 PM
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Join Date: Jan 2006
Posts: 97
Arrow 89 560 SEC Died in a parking lot Please H E L P !

Hi All,

Does it make any sense that I had a loose negative battery cable and when I tightened it the car started and drove???

1989 560 SEC
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Old 04-16-2006, 04:18 PM
kbannister's Avatar
Registered User
Join Date: Mar 2006
Location: North East, MD
Posts: 113

That will do it.
I really gets fun when they all don't run

84 500SL
99 Jeep XJ
93 Jeep YJ
03 Custom Softail
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Old 04-16-2006, 09:26 PM
t walgamuth's Avatar
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 36,297
those bad grounds can cause some really goofy problems.

tom w
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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Old 04-16-2006, 09:53 PM
Registered User
Join Date: Jan 2006
Posts: 97
89 560 SEC Died in a parking lot Please H E L P !

I do not know why they put the hood hinge so close to the ground cable on the battery.

1989 560 SEC

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