25% increase in fuel consumption after injection nozzle replacement - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 10-28-2013, 02:05 PM Thread Starter
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Post 25% increase in fuel consumption after injection nozzle replacement

I have G400 Cdi 2004 model where all injector nozzles where replaced with factory new ones. Part number of new injectors is A 628 070 04 87.

Injectors where replaced by a Mercedes workshop.

When driving with new injectors I have measured a 25% increase in fuel consumption.

Is it required to do some kinf of tuning after replacing injectors?

G400
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post #2 of 4 (permalink) Old 10-28-2013, 02:13 PM
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How did you measure fuel consumption?
Did shop supply you with any computer printout after the job?
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post #3 of 4 (permalink) Old 10-28-2013, 02:20 PM Thread Starter
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Originally Posted by Kajtek1 View Post
How did you measure fuel consumption?
Did shop supply you with any computer printout after the job?
Measurement is done by driving a known distance (at least 100km) and calculating the average consumption.

The shop did not give me any printout.
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post #4 of 4 (permalink) Old 10-28-2013, 05:13 PM
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It is hard to understand how new nozzles could change the fuel use significantly as diesels can not run rich as gasoline engines can. Do you have more or different smoking from the exhaust? Normally there is enough air in the cylinder to burn all the fuel injected, and your foot controls how much is injected.
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