1997 CL420 Cranks, No Start
04-24-2019, 10:42 AM
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W124 300E-24V
1997 CL420 Cranks, No Start
Hello, I am looking for some further insight in to my C140 coupe with a no start condition. The car is a 1997 CL420.
The car was off the road for ten years before I found it and purchased it so some issues are to be expected but i would like to make some headway all the same. I am not too familiar with the set up in the car which I believe is an M119 but I am a fairly competent mechanic with quite a lot of equipment so I should hopefully be able to get somewhere.
To start with, the car cranks over well when the battery is fully charged. I have been doing most of the cranking with it jumped as well to maintain voltage. I initially expected a dead fuel pump/blocked filter so I replaced these as a precaution anyway but to no avail. Made no difference to the non starting condition.
Upon turning the key, fuel priming cannot be heard, even with a new pump on. This lead me to bridge the relay in the boot and get fuel to the rail which i did with success, checking the valve at the fuel rail to confirm but still no start. I removed the spark plugs to confirm they were dry so I'm presuming the injectors are not getting the signal to spray or they aren't working which i think is quite unlikely as its all 8 in one.
I then proceeded to replace the crank sensor in hope that this would maybe trigger firing although I am not to sure which component actually initiates this. Again to no avail, still no start condition.
Any further help would be greatly appreciated. Thanks in advance.
The car was off the road for ten years before I found it and purchased it so some issues are to be expected but i would like to make some headway all the same. I am not too familiar with the set up in the car which I believe is an M119 but I am a fairly competent mechanic with quite a lot of equipment so I should hopefully be able to get somewhere.
To start with, the car cranks over well when the battery is fully charged. I have been doing most of the cranking with it jumped as well to maintain voltage. I initially expected a dead fuel pump/blocked filter so I replaced these as a precaution anyway but to no avail. Made no difference to the non starting condition.
Upon turning the key, fuel priming cannot be heard, even with a new pump on. This lead me to bridge the relay in the boot and get fuel to the rail which i did with success, checking the valve at the fuel rail to confirm but still no start. I removed the spark plugs to confirm they were dry so I'm presuming the injectors are not getting the signal to spray or they aren't working which i think is quite unlikely as its all 8 in one.
I then proceeded to replace the crank sensor in hope that this would maybe trigger firing although I am not to sure which component actually initiates this. Again to no avail, still no start condition.
Any further help would be greatly appreciated. Thanks in advance.
