1993 300E 2.8 Ocasional misfire/backfire
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Joined: Feb 2016
Posts: 49
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1990 200D, 1992 500SL, 1993 300E 2.8, 1997 E220D, 2012 E250CDI
1993 300E 2.8 Ocasional misfire/backfire
Hello guys.. I got the problem of the century right here..
1993 300E 2.8, 50k miles. Always drove superb. Recently got an erradic idle, and a misfire/exhaust backfire. I will explain:
When I am driving it, slowly, it drives like a dream, not sluggish no vibrations. When I stop the car, it idles fine but got some kind of drop of rpm (as shown in this video of the car:
).
If accelerating hard front end shakes (misfiring) and even backfires until gearbox doesn't reduce gear. Only after gearbox decides to reduce gear the car gains speed like a train.
Work done:
- Spark plugs
- Spark plug cables
- coils (bought 1 and exchanged between all 3, no difference in working condition, note that the connector's COIL-spark plug are original)
- MAF sensor
- OVP sensor checked and working good
- Wiring harness replaced ONLY INJECTION SIDE
- crankshaft position sensor
- even ECU checked and nothing melted
Also, the fuel rail was been taken off the car and while cranking all injectors work great, firing order and quantity of gas/petrol seems correct.
I am thinking that the wiring issue was not done properly, but again, the car has the exact same problem after all this work.
I am starting to go a little bit crazy because after all this the car is even worse..
Any help would be great..
Thanks
1993 300E 2.8, 50k miles. Always drove superb. Recently got an erradic idle, and a misfire/exhaust backfire. I will explain:
When I am driving it, slowly, it drives like a dream, not sluggish no vibrations. When I stop the car, it idles fine but got some kind of drop of rpm (as shown in this video of the car:
If accelerating hard front end shakes (misfiring) and even backfires until gearbox doesn't reduce gear. Only after gearbox decides to reduce gear the car gains speed like a train.
Work done:
- Spark plugs
- Spark plug cables
- coils (bought 1 and exchanged between all 3, no difference in working condition, note that the connector's COIL-spark plug are original)
- MAF sensor
- OVP sensor checked and working good
- Wiring harness replaced ONLY INJECTION SIDE
- crankshaft position sensor
- even ECU checked and nothing melted
Also, the fuel rail was been taken off the car and while cranking all injectors work great, firing order and quantity of gas/petrol seems correct.
I am thinking that the wiring issue was not done properly, but again, the car has the exact same problem after all this work.
I am starting to go a little bit crazy because after all this the car is even worse..
Any help would be great..
Thanks
