Hi,

Got a small problem with my 97 disco 1 V8, when the thing gets hot it wont turn over. I had this problem earlier and was told to spray water on the modulator situated near the coil which worked, so l replaced the modulator and all good, but same thing is happening again but spraying water on the modulator is not working so it must be someting else.

Anyone else had this problem..? or know how to fix..

Cheers

Phil

 

re-read OP, yep, starter if won't engage and turn over when hot. If cranks but won't start when hot, can be crank position sensor, and also fuel temp sensor.

 

So the starter does not work?
If the engine will not turn over then the starter is bad.
If the engine turns over but does not start then it is most likely the fuel temp sensor.
I have no idea what you are talking about when you say modulator.

 

Hi All,

Firstly thanks for the reply.

To answer your questions:

• The modulator is the "distributor ignition module" which was replaced as this was stopping the ignition circuit when hot - first problem fixed.
• The starter motor works fine.

Engine starts fine when cold but once it gets hot the ignition circuit will not activate the starter motor.

Help required...?

Thanks

 

You really need to rewrite what your problem is. By your first thread the engine will not Crank/turn over, now you are chasing a fuel issue, which is it?

 

Cold or hot, the act of the starter motor engaging the engine and causing the engine to turn over is controlled by electrical connections (clean battery terminals, ground terminal from battery to frame, and connections at the starter), at the starter, and various interlocks that break the connection to the cable that operates the solenoid. The solenoid itself can easily go bad, and in many cases people replace the entire starter.

Fuel pressure, spark plugs firing are other things that keep it from starting and running, but have no impact on the turning over of the engine. A starter will spin an engine with no fuel in the tank (ask my wife) and all eight plugs removed.

Here's a pix of a older starter, and a second pix of a clean one wired up, that very large cable needs to be clean and tight. That small one is the solenoid wire, it must also be clean and tight, even though it plugs on to a tab, or no initial "click". It does not take much corrosion to mess up high amp electrical connections. Inside the starter, that solenoid shoves the starter gear into contact with the engine, and turns on the almost 300 amps needed to spin the starter under load. That internal contact will become pitted and erratic over time.