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  #1  
Old 09-01-2001, 03:45 PM
richard keane
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300e misfire

In my quest to discover why i am not reving beyond 4800rpm i discovered that the fuel pump relay may be incorrect.
The item fitted has part numbers as follows
001 5457805
[02] 4zyl. kvs+kickdown
05 3702 05 12v
This item has 10 pins the numbers being
31 15 87 87h
50 td 30 87k 87v tf
The recepticle on the car has only 9 pins
This part appears to be for a four cylinder could it cause the problem ?
Also ,would like to check the correct part number for o.v.p.
Part number of unit fitted
201 540 3245
897162
Regards,
Richard Keane
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  #2  
Old 09-01-2001, 06:16 PM
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Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Absolutely!!

The fuel pump relay has an rpm writen on it. That is the cut-out point. This is usually around 6000 for 4cyl and 6cyl, but the relay doesn't count revolutions it counts coil firings. The 6cyl will have 50% more coil firings than the four cyl at any particular speed.

In other words 6000rpms is 12000 coil firings a minute for a 4cyl and 18000 for a 6cyl. Put the 4cyl relay in a six cyl and it will cut out at 12000 coil firings/minute probably 4000rpms.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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