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  #1  
Old 12-04-2006, 07:50 PM
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Join Date: Nov 2006
Location: S.F. Bay Area
Posts: 12
Starting Trouble When Warm

I have a 1979 450SL. I've had trouble starting the motor after the engine is warm. I've replaced the fuel accumulator and check valve. The car starts a little better but it still turns over and over (about 10 seconds) before it starts up. I have one or two fuel injectors that could be leaking. The mechanic that worked on the car checked the pressure with a guage and it held for about 15 minutes and then it dropped just a little. I'd hate to replace the fuel injectors and that not be the problem. Does anyone have any ideas about what's causing the warm startup problem?

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  #2  
Old 12-04-2006, 07:57 PM
Bandolero
 
Join Date: Jul 2006
Location: Adelaide, South Australia
Posts: 2
Could be the fuel damper (next to the pump)

My friend's 6.9 has that problem and he was told it was the fuel damper.
A trick to starting warm is to put the gear shifter into reverse, try to start the car for a couple of seconds, then put it back into park and start the car.
Apparently this pumps some fuel into the system before you start the car.
Hope this works.
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Russell Bond
'79 280 SE
'78 450 SEL 6.9
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  #3  
Old 12-04-2006, 08:17 PM
boomerfix
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i think that the trying to start in reverse a couple of times is the same as cycling the key without start position about 3 times without causing other problems, and i think that 1 or 2 injectors may not cause a no start condition unless there are underlying probs.....it could be as simple as coil or something else.........just my opnion
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  #4  
Old 12-04-2006, 09:00 PM
Bandolero
 
Join Date: Jul 2006
Location: Adelaide, South Australia
Posts: 2
The idea of trying to start with the >>>

auto in reverse is to pump fuel into the system to overcome a lean condition when warm. This will not work by just turning the key to ignition a couple of times.
If turning the key to start with the auto in reverse works, it means that there is a lean fuel condition when warm, which could be the fuel damper.
If it doesn't work, then it is something else.
This is just a quick test to try and work out where the fault lies.

PS; This test worked with the 6.9, he was able to start the car much easier when the motor was warm.

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Russell Bond
'79 280 SE
'78 450 SEL 6.9
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