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400 SE
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Discussion Starter #1
Hello everybody,

my benz has multiple faults in the ignition, it appears that the electricity does not reach the ignition system, when stop in a red light i can feel the failure of 1 or more cylinders, i have check most of the system, spark plugs , wires, rotors, distributor cap and all seems to be ok, when i turn the head lights ,the A/C, and the radio it makes things worst ( not that much , just make the car jumpier ).i scanned and it gave no error codes,

and yesterday didnt want to start, the wires and coils have no electricity at all:eek::eek: , but there was power in all the car , light windows radio ..

any suggestions?
 

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current fleet: 1996 s500; 1997 BMW 328ic; 2000 Nissan Frontier; 1966 AC Cobra
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Couple of suggestions:

1- provide the year of your vehicle

2- check your wiring harness for failing insulation
 

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400 SE
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Discussion Starter #3
it a 1992 400se , and i replace the harness 5 years ago . i also check the harness and it looks in perfect condition
 

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93 300se, 94 s420, 98 s420, 95 s500, 97 s500, 96 s320w, 96s320, 99 s420
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and yesterday didnt want to start, the wires and coils have no electricity at all:eek::eek: , but there was power in all the car , light windows radio ..

any suggestions?

maybe the windows might work and soon the radio but if the car doenst start might be somthing in there not allowing it from to do so.

this is out of no where but doesn't hurt to try,

get your self a multimeter and do a voltage test for your battery and amperage test reading for your alternator . try them both with the car on and accessories on , and the car off. see what your readings are and maybe you would find something that might cause what your experiencing with the power surge in your ignition system..


good luck
 

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Discussion Starter #8
maybe the windows might work and soon the radio but if the car doenst start might be somthing in there not allowing it from to do so.

this is out of no where but doesn't hurt to try,

get your self a multimeter and do a voltage and amperage test. try them both with the car on and accessories on , and the car off. see what your readings are and maybe you would find something that might cause what your experiencing with the power surge in your ignition system..


good luck

ok thank you , where should i connect the multimeter :(??


by the way nice tail lights :thumbsup: , looks like the w221:D
 

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93 300se, 94 s420, 98 s420, 95 s500, 97 s500, 96 s320w, 96s320, 99 s420
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603 Posts
ok thank you , where should i connect the multimeter :(??


by the way nice tail lights :thumbsup: , looks like the w221:D

ok look what you do . if you are able to start the car at all,

start it up, pump up your trunk and get access to the battery in the right side of the trunk, after your car is turned on, turn on the headlights to , the stereo, get the multimter turn the switch in it to 20v DC put the red knob to the positive cable of battery and the black knob to the ground battery and cable and see what the reading is on the multimeter. if you got anything under 13.xx volt than your alternator ( regulator is not good) if you got anything over 13 than youll pass that test.

shut off the car and just test the battery itself and see what youre reading for voltage with the car off.

let me know .

btw thanks and appreciate your comment about those tail lights
 

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1993 300SEL (Sold) 2007 X5
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I'd imagine that if it's only at low idle it's a failure of the charging system. If the car has high km's/miles then it might not be charging properly through the alternator and may need the bushes or bearings redone.
 

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Discussion Starter #11
I'd imagine that if it's only at low idle it's a failure of the charging system. If the car has high km's/miles then it might not be charging properly through the alternator and may need the bushes or bearings redone.

is only 87500 miles but could be
 

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1993 300SEL (Sold) 2007 X5
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That is reasonably low miles, perhaps the humidity could have some effect and cause it to deteriorate faster? I don't know.
 

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Discussion Starter #13
ok the car starts but is jumpy , the cilinders are failling , the spark plugs are not constant , last night in a total dark i was amazed because all the spark plug wires were glowing :eek::eek::eek: it was cool :cool: , but i guess the wires are completely bad RIGHT ?:confused:

the multimeter shows 14.20v when is start but it goes up and down ,
when the A/C , the head lights and the radio are on it shows from 13.10v to 13.27 an so..

any sugestions ?:bowdown:
 

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1993 300SEL (Sold) 2007 X5
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What's the condition of the ignition coil? Also have you had the leads tested or do they just look OK?
 

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2010 E350 P1/P2, 2008 S550 Designo, 2002 ML320
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If you see that kind of glow from the wires, they are most certainly in need of replacement.
 

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Discussion Starter #17
If you see that kind of glow from the wires, they are most certainly in need of replacement.

yes i think i better replace them , may be thats the problem , thank you all for your advise , i will post the results .:thumbsup::thumbsup::thumbsup::thumbsup::thumbsup::thumbsup::thumbsup::thumbsup::thumbsup::thumbsup::thumbsup::thumbsup:
 

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1993 300SEL (Sold) 2007 X5
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If you see that kind of glow from the wires, they are most certainly in need of replacement.
Yeah I was gonna say like so many ignition components a visual inspection can be pretty misleading, mine looked fine when infact 2 of them had faults causing a misfire.
 

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93 300se, 94 s420, 98 s420, 95 s500, 97 s500, 96 s320w, 96s320, 99 s420
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603 Posts
ok the car starts but is jumpy , the cilinders are failling , the spark plugs are not constant , last night in a total dark i was amazed because all the spark plug wires were glowing :eek::eek::eek: it was cool :cool: , but i guess the wires are completely bad RIGHT ?:confused:

the multimeter shows 14.20v when is start but it goes up and down ,
when the A/C , the head lights and the radio are on it shows from 13.10v to 13.27 an so..

any sugestions ?:bowdown:


ok you're car doing good on the chargin system then.. what it seems to be the problem its in your ignition engine electrical system ( ignition wires, spark plugs, or coils.. you have to check/replace one by one and see what fixes the problem. good luck
 

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Discussion Starter #20
well the spark plugs are new , $20 each at the dealer :mad: , i order the wires , just have to wait to order the coils .
 
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