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What is this device inline with the fuel line out of the WUR

 
Old 05-17-2019, 10:54 AM
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kcm93
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Default What is this device inline with the fuel line out of the WUR



That yellow thing inline with the fuel hose. Looks like a fuel injector? What is the purpose of that

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KM
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Old 05-17-2019, 11:29 AM
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Jadz928
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Looks like a frequency valve which modulates control pressure base on Lambda sensor output.
Common addition to gray market 'Euro's when federalized in the US.
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Old 05-17-2019, 02:02 PM
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kcm93
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Originally Posted by Jadz928 View Post
Looks like a frequency valve which modulates control pressure base on Lambda sensor output.
Common addition to gray market 'Euro's when federalized in the US.
so that must also explain the German warnings on the dash lights. Interesting.
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Old 05-17-2019, 03:37 PM
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dr bob
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Look for "KE Jetronic", the official Bosch designation for the modulated-pressure system when fitted OEM. The injector valve is actuated by an analog controller that reads an oxygen sensor. The duty cycle of that injector valve is adjusted to manage control pressure, based on the readings for CO in the exhaust. A working KE Jetronic offers some significant fuel and emissions savings over a K Jet system. With the mixture monitoring working correctly, you can tune the fuel metering unit with a common "dwell meter" and/or a DMM. Look for 50% duty cycle on the valve using the dwell meter or an o'scope, or a 0.5 VDC average reading from the sensor itself. To work correctly, you need a different warm-up regulator than a "normal" K Jet system uses.
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Old 05-17-2019, 11:25 PM
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reanimotion
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KE-Jetronic has no WUR at all and a completely different control system attached directly to the fuel head

I also doubt it's a K-Jet Lambda retrofit, as that would require a later fuel head
Lambda works by varying the upper and lower chamber pressure differential, not CP

It is more likely an attempt to replicate the hot start valve which bleeds off control pressure during cranking on a warm engine

If there is no electrical connection to the injector and the engine runs ok with no fuel leaks, just leave it as is.
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