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Matt
Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 20575
Experience:  BEng hons Mech engineering, in auto industry 22 years
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M- E240 estate year 2000. If the car is parked in the sun

Customer Question

M-B E240 estate year 2000. If the car is parked in the sun light the under bonnet temperature increase and affects the engine. The engine will start and run for a few seconds but then stops. If the bonnet is lifted for a several minutes to allow the hot air under the bonnet to escape, the engine will then start and run normally. The same problem occurs if the car is stationary in traffic for more than a few minutes, but the engine runs normally if the car is moving. Water temperate is normal.
Submitted: 4 months ago.
Category: Mercedes
Expert:  Matt replied 4 months ago.

This could be a wiring issue as things tend to expand when hot and its possible a poor or partial electrical connection is being pushed apart on one of the major sensors so check the connection plug and wiring to the following;

Airflow meter

Crank position sensor

Cam position sensor

O2 sensor

Throttle position sensor

unplug each in turn and use some switch / contact cleaner spray on the pins to ensure its all grease / dirt free

Also worth checking the connections to the fuel pump for the same reason - unplug each in turn and give them a good squirt of switch / contact cleaner - Not WD40

and also unplug and inspect the main power relays and fuses for signs of overheating or corroded terminals - so the ones for the ECU and the fuel pump

And also unplug the wiring loom connections in the engine bay one at time and inspect for corroded or recessed pins.

Check the resistance of the spark plug leads ( 13-15Kohm / metre) and replace if any doubt or high resistance - Also replace the spark plugs if any of them fail this checklist:

http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp

rmal>

Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a quick fault find if you unplug the meter and run the engine without it.

if the engine condition is the same then chances are the meter or the connection to it is faulty

Expert:  Matt replied 4 months ago.

Hi

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