Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1987 Mercedes Benz 260EFACTORY OEM SERVICE PROCEDURE
Acceleration Enrichment
- To test acceleration enrichment function, cold engine operation must be simulated as acceleration enrichment is not functional above 176°F (80°C). To simulate cold engine, connect a 25,000-ohm resistor wire between coolant sensor wiring connector and vehicle ground.
- Start engine and bring engine speed up to 2500 RPM for short time. Lower chamber pressure should drop as engine speed increases. If lower chamber pressure does not drop, test airflow sensor potentiometer, test control current to differential pressure regulator and test ECU.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.