Thread: Disco TDI300 hard starting when warm

Originally Posted by Matt & Jo

Hi all.
Just changed Disco's from V8 to TDI300 s1 and the old girl is a bit hard starting when warm. Motor ticks over easy. Always wait for Glow plug light top go out before turning the key. ????
Could it be Glow plugs. If so why only when warm.
Matt & Jo.

No need to wait for the glow plugs as they arent really required here, check all the filters and the sedimenter, i cant think of anything except possibly the injector pump solenoid power lead ?

if it happens a lot when the car has been on a good run but happens intermittently then it could be the starter on the way out...this is what happened to mine.

there is a way of testing this if the car doesn't start but I can remember it requires putting a wire to the starter solenoid or something...but I'm sure someone will chime in

Check the earthing...

The starter gets its earth through the casing, which in turn gets it from the block, etc... All it takes is a thin smear of oil/grease and the electrical connection is knackered.

The easy way of testing is to simply use a jump lead. When you get the problem next, stick the jump lead onto one of the starter/bell housing bolts and the battery -ve and see what happens.

M

Some things to try:

* Check spade connector onto starter solenoid. Get's dirty from oily turbo hose above
* Check voltage at starter solenoid. Mine was only 9V, enough to click but not actually engage fully
* Check earth straps on chassis, gearbox and battery
* Check ignition switch as they can fail