![]() I mimicked the XJS EFI wiring as much as possible to make troubleshooting easy for someone familiar with the XJS system. The advance vacuum line already is directly on the manifold, and the AC already activates the idle bump valve thru the relay. However i left it in the harness and can use it if I feel the need to increase the idle at some point. ![]() I don't need it insofar as my installation does not use catalytic converters. It's a vestigial component from previous work arounds by the factory. Keep the supplemental air valve for the a/c idle increase if you have a/c. The only other thing the timer does is power the supplemental air valve for 45 secs when the vacuum advance is off so the idle speed isn't too low. Just run the vacuum line from the manifold directly to the vacuum regulator, instead of having the solenoid in between. It's sole purpose is to eliminate vacuum advance so the catalysts will light off slightly faster. It seems that this is the only way the 45 sec timer will work because if the pump relay is not energized, the timer won't have power to operate and the trigger signal from the start switch will not initiate a timer start. Is that incorrect, and it actually grounds the pump while the starter is engaged. ![]() I thought that the ECU holds the ground open until the engine starts and is running. the ground is supplied for about 5 sec when the ignition is turned on, but then drops out. The relay coil is powered by the main relay but is only energized when the coil ground is supplied by the ECU. the 12v power for the device comes from the fuel pump relay. the component listing and illustration above is very helpful, but how does one troubleshoot the device to determine which component needs replacement.Ģ. Odd, because it is new, but perhaps I also ruined it the installation (the anomaly is the the installation is in an E-type that is the beneficiary of the EFI originally installed in an '88 XJS I had the wiring wrong the first time, but it is now corrected) I have 2 questions:ġ. I have one of these timers and it did not seem to work in the car, and neither on the bench. This is a bit old but I suppose issues on these cars are eternal. I'm doing this test out of the car, which should rule out any wiring issues.Ĭould be I have a bad uld be I'm completely misinterpreted the wiring diagram. When I apply power to the timer leads that connect to the black and slate wires, I don't get voltage out of the white and pink/white wire connectors. From looking at the EFI and Emissions Control schematic that is appropriate for my '87 V12, it seems that the black wire goes to ground, the slate wire applies power to the timer, and the white and pink/white wires should apply power to turn on the SAV and the Solenoid Vacuum Valve (I took my SVV off also) for 45 seconds. ![]() Since I took my a/c off, I'm not too concerned with that aspect of if.Īnyway, I see the timer has four wires to it, black, slate, white and pink/white. I'm having a problem understanding the 45 second timer which controls the SAV.įrom what I've read, the timer has two functions, to increase the idle speed at start and also when the a/c is running. I'm replacing my long defunct Supplementary Air Valve. Please register or login to enable Dark Mode.Forum announcement archives / Forum History.PRIVATE For Sale / Trade or Buy Classifieds.Other Jaguar Models / Concepts / Replicas.S-Type / S type R Supercharged V8 ( X200 ).Jaguar Forums Feedback & Suggestion Center.
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