ignition problem please help
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Member
Joined: May 2007
Posts: 236
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From: stamford, CT
1993 Mercedes 300e 4-matic (m103 motor)
ignition problem please help
ok i need help my cars been undrivabel for about 2 monthes now. and i'm getting ready to throw a match down the gas tank and be done.
Ok heres the deal it will run fine start up fine until runnign temp than it will just turn off. EVERY TIME it will turn off. 9/10 times it will start back up and run for 2 ro 3 minutes than completely die. Than it will crank but no start.
I replaced the ignition coiul, spark plugs, wires cap rotor, and OVP. what else should i change, and has anyoen had this problem or heard fo somethign liek this, i'm so desperate for answers i love this car but its so frustrating that i can;t use it.
Ok heres the deal it will run fine start up fine until runnign temp than it will just turn off. EVERY TIME it will turn off. 9/10 times it will start back up and run for 2 ro 3 minutes than completely die. Than it will crank but no start.
I replaced the ignition coiul, spark plugs, wires cap rotor, and OVP. what else should i change, and has anyoen had this problem or heard fo somethign liek this, i'm so desperate for answers i love this car but its so frustrating that i can;t use it.
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Joined: May 2005
Posts: 2,494
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From: REHOBOTH BEACH DE
88-300CE TWIN TURBO, 99-C43, 05-G55K, 71-280SL, 94-E320 CAB, 08 CLK63 BLACK SERIES
ok i need help my cars been undrivabel for about 2 monthes now. and i'm getting ready to throw a match down the gas tank and be done.
Ok heres the deal it will run fine start up fine until runnign temp than it will just turn off. EVERY TIME it will turn off. 9/10 times it will start back up and run for 2 ro 3 minutes than completely die. Than it will crank but no start.
I replaced the ignition coiul, spark plugs, wires cap rotor, and OVP. what else should i change, and has anyoen had this problem or heard fo somethign liek this, i'm so desperate for answers i love this car but its so frustrating that i can;t use it.
Ok heres the deal it will run fine start up fine until runnign temp than it will just turn off. EVERY TIME it will turn off. 9/10 times it will start back up and run for 2 ro 3 minutes than completely die. Than it will crank but no start.
I replaced the ignition coiul, spark plugs, wires cap rotor, and OVP. what else should i change, and has anyoen had this problem or heard fo somethign liek this, i'm so desperate for answers i love this car but its so frustrating that i can;t use it.
Might as well replace the fuel pump relay which can give the symptoms you are seeing.
The OVP and fuel pump relay in the M103 with KE-Jetronic III are the "brains" of the engine.
If they don't react to the speed signal from the yellow/green wire they will shut the fuel pumps down
Thread Starter
Member
Joined: May 2007
Posts: 236
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From: stamford, CT
1993 Mercedes 300e 4-matic (m103 motor)
i replaced the ovp but i got a used part on ebay so i'm going to try and buy a new one from. is there any way to test the ovp and fuel pump relay?
and of it was the fuel pump relay why woudl it start than die, wouldn't it just not start?
and of it was the fuel pump relay why woudl it start than die, wouldn't it just not start?
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Joined: May 2005
Posts: 2,494
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From: REHOBOTH BEACH DE
88-300CE TWIN TURBO, 99-C43, 05-G55K, 71-280SL, 94-E320 CAB, 08 CLK63 BLACK SERIES
When you turn the key your fuel pumps will start.....they will only keep on running after the engine starts if the relay sees a speed signal.
No speed signal and they shut down and so does the engine.
You should see a black/red/white wire from pin 87 on the fuel pump relay which goes to the fuel pumps.
Turn the ignition on and you should measure a voltage to ground from this point.
Start the car and watch if the voltage drops off prior to stall....if it does it usually is the relay.
Start with the simple inexpensive stuff and work back to the EZL unit on the M103
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Joined: Dec 2006
Posts: 1,042
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From: Bellevue, NE
1995 E320 SE, 162,000 Miles (Sold) 2007 CLK350 Cabriolet 2014 ML550
ok i need help my cars been undrivabel for about 2 monthes now. and i'm getting ready to throw a match down the gas tank and be done.
Ok heres the deal it will run fine start up fine until runnign temp than it will just turn off. EVERY TIME it will turn off. 9/10 times it will start back up and run for 2 ro 3 minutes than completely die. Than it will crank but no start.
I replaced the ignition coiul, spark plugs, wires cap rotor, and OVP. what else should i change, and has anyoen had this problem or heard fo somethign liek this, i'm so desperate for answers i love this car but its so frustrating that i can;t use it.
Ok heres the deal it will run fine start up fine until runnign temp than it will just turn off. EVERY TIME it will turn off. 9/10 times it will start back up and run for 2 ro 3 minutes than completely die. Than it will crank but no start.
I replaced the ignition coiul, spark plugs, wires cap rotor, and OVP. what else should i change, and has anyoen had this problem or heard fo somethign liek this, i'm so desperate for answers i love this car but its so frustrating that i can;t use it.
]I've seen this issue somewhere on this forum before. Anyone recall what the problem was?
Thread Starter
Member
Joined: May 2007
Posts: 236
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From: stamford, CT
1993 Mercedes 300e 4-matic (m103 motor)
I've seen this issue somewhere on this forum before. Anyone recall what the problem was?[/QUOTE]
yeah i've posted about this before. also if theres any indies aroudn me who coudl diagnose this problem and wants to make some extra money i'd appreciate it. It also will like hesitate and rpms will die to almost 0 when i floor it.
yeah i've posted about this before. also if theres any indies aroudn me who coudl diagnose this problem and wants to make some extra money i'd appreciate it. It also will like hesitate and rpms will die to almost 0 when i floor it.
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MBWorld Fanatic!
Joined: Dec 2006
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From: Bellevue, NE
1995 E320 SE, 162,000 Miles (Sold) 2007 CLK350 Cabriolet 2014 ML550
Have you tried disconnecting the temp sensors to rule those out?
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MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,042
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From: Bellevue, NE
1995 E320 SE, 162,000 Miles (Sold) 2007 CLK350 Cabriolet 2014 ML550
I can't find it anywhere in the service manual. 
It should be sticking out of the block towards the top by (or in) the t-stat housing.
On second thought, it could be the ignition coil giving out when it gets hot. Have you tested for spark when it gets to the point where it doesn't start?
It should be sticking out of the block towards the top by (or in) the t-stat housing.On second thought, it could be the ignition coil giving out when it gets hot. Have you tested for spark when it gets to the point where it doesn't start?
