Misfire cylinder 1 - Mercedes Benz SLK Forum

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#1 Old 11-05-2017
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Misfire cylinder 1

Been having trouble with the car running rough. Seemed worse at top revs. Struggle to get over 100mph. Cleaned maf and top end was better, could get up to top speed again, but still running rough. But after maf clean would start to stall at idle. Replaced mag with Bosch and runs much better. Top whack ok, no stall but still slightly rough. Starts fine, no lights. Runs smooth till you hit the gas hard. Ran the individual and got p0301 - misfire in cylinder 1. Guess I should start looking at the spark plugs. Can I swap the spark plugs around and see if the error code moves with the plug? Same goes for the coil if plug doesn't change anything. And if still no change should I go for the CPS? Or the 02 sensor. Any advice gratefully received
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#2 Old 11-05-2017
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When I had that error it was the cps crank position sensor
how many miles you got?
quick and cheap fix

Move plug from 1 to 2
move injector from 1 to 3
move ignition wire from 1 to 4
if still error, move coil from 1 to 2
if still error
replace cps
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#3 Old 11-06-2017
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104k miles. And I had it serviced a couple of years back and they changed all the plugs, so I don't think it'll be just the plug - unfortunately. CPS is what I'm erring towards. Good to know that I can swap all those elements around - that is exactly what I wanted to know. Much appreciated. Will report back.
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#4 Old 11-06-2017
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Try those on cylinder 1
-spark plug ( new or swap with cylinder 2)
-coil pack ( new or swap with cylinder 2)

If those fail then you have to check:
-injector
-compression test
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#5 Old 11-06-2017
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I had a misfire on cylinder 1, car ran rough. Turned out to be a fuel injector. Fairly easy job to replace, and it cured the rough running problem. 114,000 miles at the time.
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#6 Old 11-06-2017
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Gonna swap things round at the weekend, as Mr Banks suggests. Narrow down or eliminate plugs, coil, and injector. And move on from there. The odd thing is if you reset the system, ie turn ignition off and on (even while moving, if enough momentum) the engine runs fine again. Thanks for all the responses. Very useful.
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after 3 engine restarts, cel goes away but stays stored because issue not currently happening until next time


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#8 Old 11-06-2017
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Torque Pro shows Pending (yellow) and Current (red) faults. Carly Pro shows page after page after page... Both can clear them.


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#9 Old 11-07-2017
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Thanks for all the replies. First time using odb. What is the difference between logged and pending faults. I have p0301 logged. And notice there is a pending code p0700. But I don't have any cel on.
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#10 Old 11-07-2017
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Google "OBD code p0301" and you get: https://www.obd-codes.com/p0301

and for the other: https://www.obd-codes.com/p0700

As I understand it, logged is a permanent error and the pending is - just pending. Might be wrong there (and stand to be corrected:-).
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#11 Old 11-07-2017
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Clear all codes, drive your car and scan again see what code is stored.
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#12 Old 3 Weeks Ago
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I am having the same problem. What was the fix?
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Originally Posted by Mantist View Post
I am having the same problem. What was the fix?
This is a two year old thread and the op hasn't been here since.
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#14 Old 3 Weeks Ago
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I know. Just hoped someone would chime in to help..
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