95 E320 Cranks but No Spark - Mercedes-Benz Forum
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post #1 of 26 (permalink) Old 06-03-2019, 11:16 PM Thread Starter
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95 E320 Cranks but No Spark

Been rebuild/swaping the engine on my 1995 E320 convertible. I have gotten everything connected and the engine cranks but I am not getting any spark out of the coils. Things I have tried so far to fix this.

1. Test the CPK(CPS) crank position sensor. Reads 0.1 ohms however I am not confident in this reading. Hard to see what I was doing under the car.
2. Unplug the CPK(CPS) and see if the RPM reading stayed at zero which it did. Plugging the sensor back in restored the rpm reading when cranking the engine. This makes me think the sensor is ok.
3. Tested/swapped the coil packs off the scrap engine.
4. Checked for engine codes with the built in LED. Did not see any.
5. Tried cranking the engine in neutral.
6. New spark plugs.
7. Measure voltage on the low voltage side of the coils. Reads 9-10v DC
8. Checked all the fuses I could see. . none were bad.
9. Check the OVP (over-voltage protection circuit). No corrosion on terminals. Audibly clicks when turning the key. Possibly Good...anyone know how to test this?
10. Checked the resistance on the plug wires. Read 2k ohms. Not surprising this was a new set from MB.
11. Getting pressure on the fuel rail. 50-60 psi when cranking.

Observations thus far:
-I can definitely smell gas in the exhaust and in the cylinders when I pull a spark plug. Injectors working...
-The starter smells like it is cooking. (probably from to much cranking??)
-Very rarely I can see a spark on plug 1. This was after ~10 cranking session of 30 second duration. (this only happened once)

Car info:
-Wiring harness has been replaced. (hooray for ecojunk)
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post #2 of 26 (permalink) Old 06-04-2019, 02:07 AM
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Check the carbon brush in the centre of your distributor .Sometimes they get damaged after the distributor cap is removed and as its lined back up it damages the earth brush in the centre of the distributor .Another thing if engine was rebuilt , do a check on all the earth points, as they may have been removed , and not re fitted back in place. Earth leads are a return path back to the battery .Even battery poles can be a problem if dirty or loose .Remove earth leads grease them up and refit after cleaning the body . Check all fuses in the fuse bax . If you see a spark the alarm and imobiliser is ok . You could look in the engine in the dark .You will be looking for electrical shorts you will see them better in the dark if it is going on. Good luck .

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post #3 of 26 (permalink) Old 06-04-2019, 02:31 AM
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Do you have signal on the injectors?

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post #4 of 26 (permalink) Old 06-04-2019, 03:17 AM
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No distributor on the OP's car and he's stated that he can smell gas. I would replace the OVP. Without it being 100% solid, your car will not run.

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post #5 of 26 (permalink) Old 06-04-2019, 01:46 PM Thread Starter
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Ordered a new OVP today. Going to give this a shot. I also tested it using the procedure here:

https://www.benzworld.org/forums/w12...tion-test.html

Everything seemed to work correctly. No voltage drop on the pins etc.

Gonna go over the car again and see if I missed anything.
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post #6 of 26 (permalink) Old 06-06-2019, 07:54 AM Thread Starter
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Got the new OVP in from mercedes and the car still will not start. Testeded for spark again on the plugs with a timing light and nothing. Not sure what to try next...crank sensor?
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post #7 of 26 (permalink) Old 06-06-2019, 09:28 AM Thread Starter
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Checked the resistance on the crank sensor it is 1.111 k ohms. Maybe faulty.
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post #8 of 26 (permalink) Old 06-06-2019, 09:30 AM
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A healthy crank sensor should measure in the neighborhood of 800 ohms.

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post #9 of 26 (permalink) Old 06-06-2019, 09:49 AM
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check your ignition module/CDI. or you can check the voltage on the cable towards the coil pack, maybe around 12 volts. if it's not there, maybe your ECU or CDI [ignition module] has a problem. try to find ECU or CDI that you can borrow, so you don't buy the wrong item.
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post #10 of 26 (permalink) Old 06-06-2019, 01:01 PM
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I would suspect that you have a bad ECU. If the injectors are firing and the tach is responding while cranking, then the CPS is putting out a sufficient signal. Since you have ruled out the other components of the ignition system, that leaves the ECU. Was the non-start condition sudden? Perhaps the ECU was damaged by the ecco junk wiring while it was still in the car and now it has failed.

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