Need a Chicklet ... Lucas rd 953066 - Defender Source
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  #1  
Old March 7th, 2017, 08:29 AM
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Jason England
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Need a Chicklet ... Lucas rd 953066

Does anyone have one?
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #2  
Old March 7th, 2017, 09:03 AM
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Are talking about the 6.8 Ohm tune resister?
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Still looking for that place where I can carry a paddle and get asked what's that.

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  #3  
Old March 7th, 2017, 09:03 AM
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We are indeed!
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #4  
Old March 7th, 2017, 09:49 AM
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This is not a tune resistor, from memory tune resistors are colour coded?

When visually inspecting the EFI Cable Harness Assembly, one unusual component that's particularly conspicuous is the resistor that Rover included on the Engine Speed sense circuit. This resistor should NOT be confused with the Tune Resistor. This circuit is the only connection between the ignition system and the fuel injection system. A damaged or loosely connected resistor would likely result in an open circuit, leaving the ECU wondering about engine speed.

In our example system this resistor is marked "Lucas", "RD953066", "83630A", and "892Q". The resistor should provide about 6.8k Ohm resistance.

Its there to limit the back emf from the coil damaging the ECU when the coil fires, as its the RPM signal to the ECU, and if it goes open circuit the ECU will cut the fuel after a second or two as it thinks the engine has stopped.
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Still looking for that place where I can carry a paddle and get asked what's that.

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85 LR90
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  #5  
Old March 7th, 2017, 09:52 AM
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Quote:
Originally Posted by roverman2010 View Post
This is not a tune resistor, from memory tune resistors are colour coded?
Oh as siri would say let look that up on the web.
Tune Resistor

A Tune Resistor was originally specified in the wire harness so that one ECU part number could serve multiple vehicle markets. (Multiple computer programs could be stored within the ECU, and the ECU could "decide" which one to use based on what resistance it sensed.) One leg of the Tune Resister was wired to terminal 5 of the ECU, and the other leg was spliced to ground.

At some point during 14CUX production, Rover apparently decided to eliminate the Tune Resistor. (According to Rover service literature, this started with VIN number LA451517.) It isn't clear from the literature whether any US-market 14CUX systems would be effected by having an incorrect or damaged tune resister. The example system we photographed and described for this article NEVER HAD A TUNE RESISTOR!

The following information on Tune Resistors is based on Rover service literature.

Visual inspection of wire color codes will allow you to quickly differentiate between resistors.
White 3900 Ohms USA and European vehicles with catalytic converters
Green 470 Ohms UK and European vehicles without catalytic converters
Yellow 910 Ohms Saudi vehicles (without catalytic converters.)
Red 180 Ohms Australia and "the rest of the world."

Note: all four types of Rover Tune Resistors were rated for 0.5 Watts.



When fitted, the Tune Resistor was connected to the ECU through terminal position 5, and it was also connected to terminal position 27 through a splice. If you wish to check the resistor, first disconnect power to the system, second disconnect the EFI Cable Harness Assembly from the ECU, and finally simply measure resistance (using an Ohmmeter) from pin 5 to pin 27 on the main ECU connector. (Resistance isn't polarity dependent.)
Any good info?
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Edward Teach is the Blackbeard, and is a member of the Birmabright Brotherhood.

Still looking for that place where I can carry a paddle and get asked what's that.

JnK Services
FC101 GS FFR
57 LR 88" SXF 858
85 LR90
95 D1 Tdi
05 D3 HSE
97 XK8 BRG FHC For Sale
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  #6  
Old March 7th, 2017, 10:19 AM
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The chicklet is a resistor but it is not the elusive tune resistor.
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  #7  
Old March 7th, 2017, 10:32 AM
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Kevin Keith
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Found info on Piston Heads.... Lucas part #FDB943.... but my google skills did not bring up any sellers.

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  #8  
Old March 7th, 2017, 11:12 AM
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so i built a replacement which is in the truck now ... i'd like to have the real thing though
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #9  
Old March 7th, 2017, 11:14 AM
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RD 953066 is not the tune resistor. It is the resistor in the engine speed sensor line to the EFI ECU. It is just there to protect the ECU from high current.
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  #10  
Old March 7th, 2017, 11:18 AM
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I know exactly what it does ... I just need to find one! ;-)
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #11  
Old March 7th, 2017, 11:22 AM
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Quote:
Originally Posted by leastonce View Post
I know exactly what it does ... I just need to find one! ;-)
?? In a post above, you said it was a tune resistor. It is not.
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  #12  
Old March 7th, 2017, 11:24 AM
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Quote:
Originally Posted by Red90 View Post
?? In a post above, you said it was a tune resistor. It is not.
i didn't ... someone else did! ;-)
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #13  
Old March 7th, 2017, 11:28 AM
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John B.
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But, you agreed. I'm confused.

All that aside, any old high value resistor will work in this service. It does not matter.
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  #14  
Old March 7th, 2017, 11:39 AM
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Quote:
Originally Posted by leastonce View Post
i didn't ... someone else did! ;-)
I was taken the piss lol. It seems that here in the good old USA they call everything somting differant just what they feel like, same as does the bloody french.

Still the best was somebody calling the crankshaft damper bolt a "dog nut" just WTF is a dog nut?
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Edward Teach is the Blackbeard, and is a member of the Birmabright Brotherhood.

Still looking for that place where I can carry a paddle and get asked what's that.

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FC101 GS FFR
57 LR 88" SXF 858
85 LR90
95 D1 Tdi
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97 XK8 BRG FHC For Sale
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  #15  
Old August 21st, 2017, 02:30 AM
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Anyone have a lead on a replacement engine speed sensor inline resistor?
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  #16  
Old August 21st, 2017, 07:04 AM
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Land Rover part #DRC1752L. Obsolete NLA. Try Rob Bass or Randy at Roverbones. They will have to poach one from a harness.
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  #17  
Old August 22nd, 2017, 06:47 PM
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Drew Rogers
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Thanks Bill. Randy is hooking me up.
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