Hi, My 84 QV has developed an intermittent none start issue! Car is running perfect in every way apart from occasionally don’t turn over, you can hear the fuel priming etc but start doesn’t go. Then sometimes will start 20 times no issue, really randomly does this Any one else experienced anything similar? Thanks in advance Ross
They are known to have a start problem due to low voltage getting to the starter solenoid, this can be a bad connection etc. if you find the starter motor and it solenoid, connect a voltmeter to the signal wire to the solenoid from the ignition key and see how many volts you get. I can let you have a wiring diagram if u drop me an e mail address. You can also get a relay kit to improve this lack of volts
Thanks Mike, Would appreciate that! Would that still be the case if it only doesn’t start every so often? Or would the low voltage be expected to be constant if was this? thanks
It gets intermittent, do you have an immobilizer. Also can be starter motor needing overhaul.( dont buy new one as might be brushes) You need to find out volts to starter solenoid. Starter motor is a pig to get out . Send e mail address for circuit diagram
I did have that problem...and changed almost everything before finding the reason...1 coil going bad.
When the key is in Pos III (start), the fuel pump will run (and audibly hum) even if the starter/solenoid doesn't actually engage and spin the flywheel (it's not really "priming", it's just trying to run like it always does during starter motor cranking or engine running).
Oh I see so normally we don't hear that because of the starter motor noise. I thought it's inhibited from running as long as the air measuring plate is closed.
That's what the additional relay controlling the fuel pump relay is all about -- if the air measuring plate is closed during starter motor cranking (which it often is because the engine RPM is so low during starter motor cranking), this additional relay sends the same signal going to the starter solenoid to the fuel pump relay to close it and run the fuel pump. Gives the behavior: When the starter motor is cranking (key in Pos III) = the fuel pump always runs regardless of the state of of the safety switch of the air measuring plate. When the engine is running (key in Pos II) = the fuel pump only runs if the engine is actually running and the air measuring plate is deflected enough open the safety switch contacts.
Anyone else added the relay kit? Got the diagram from Mike, just want to know which relay to use? Thanks
This is one reason why I'm not a fan of the "relay" solution. No relay is really designed to be mounted directly on top of a hot engine, and even heavy-duty starter motor relays that are designed to be mounted under the bonnet, like this: Image Unavailable, Please Login are typically mounted on the side inner fender wall (away from the engine). I know that there are plenty of people using the small cube Bosch relay on top of the engine seemingly successfully, but we have had one report of a flywheel getting torn up when such an added small cube relay got stuck in the closed position IIRC. (Rant off ...)
Mine was mounted by the starter motor sealed in a plastic bag for over 10 years with no issues. The extra relay takes its power from the starter power supply and the original line from the ignition switch to the solenoid becomes its signal.
I have my ac relay inside the eco by-passed by another relay to remove the load from the ecu. That additional wire goes to the remote AC clutch relay and only gets power when the starter motor is not running.
That is connected the same as my explanation. You are putting an extra relay in as a primary, which then supplies the starter solenoid as a secondary relay. You can fit this in the boot by the sunroof motor or elsewhere as only need to run a couple wires. Pointless putting in the engine bay as too hot.
