Misfire when engine cold

1996 MERCEDES BENZ E230
276,000 MILES • 2.3L • 4 CYL • RWD • AUTOMATIC
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ZIQ MOHAMMAD
  • MEMBER
  • 1 POST
Engine misfire when cold.
Engine fault code.
1. (MB Code 036) Lambda control, mixture too rich (intake air leak, fuel injectors, diaphragm pressure regulator).
2. (MB Code 067) Camshaft signal incorrect/not recognize.
3. (MB Code 064) Crankshaft signal incorrect.

Parts replaced.
1. Spark plugs.
2. Coil plugs.
3. Spark cables.
4. Camshaft position sensor.
5. Crankshaft position sensor.
6. Fuel pump.
7. Fuel filter.
8. Fuel pressure regulator.

Compression test
Cylinder one dry 180/ wet 200
Cylinder two dry 180/ wet 200
Cylinder three dry 180/ wet 200
***Cylinder four dry 170/ wet 150
May 16, 2017 at 1:11 AM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
Misfire when cold sounds like a vacuum leak around the manifold. When it warms up the parts expand and seal up.

Check the new parts on a scan tool to be sure they are sending a good signal and that they are in sync. A hard reset and cam/crank relearn may take care of those codes, unless the cam chain is stretched, which it could be. That should show up using a scope and looking at the wave-forms of the cam and crank sensors.
May 16, 2017 at 8:12 AM
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