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[BazaJT]

Went to pick up step daughter for a hospital visit with her mother.Anyway the journey is about 25mls each way,approx 60% of which is motorway with ordinary town roads at each end.Car started and ran perfectly all the way there and when I arrived I turned it off,went to restart it a couple of minutes later and it was just as though the battery was flat.The engine turned over very slowly or only sort of part turned over but not fast enough to start.After about 20mins.went to try it and it started with no problems.Temp.gauge when I turned it off was showing 90 degrees[but it's got a lazy 'stat],this has happened on two previous occasions when I've stopped for fuel after a long run,but on both these occasions it's turned over just fast enough to start.From cold/cool the car starts and runs perfectly.No codes are showing,the coolant is up to the mark so no sign of coolant loss.It seems to me to be heat soak causing this problem but why? and how would I cure it?Anyone else experienced this type of problem?

[Grrrrrr]

Sorry, no but as a wild guess I'd have a look for a loose connection either on the starter solenoid or possibly an earth strap.

[Webby the Bear]

Sounds like a crank sensor 

[Entwood]

Sounds like a crank sensor 

Nope .. not IMHO ..

Crank sensor will stop the engine FIRING .. it will NOT stop the engine "turning over" at normal speed.. the ONLY reasons an engine will not turn over at normal speed are..

1) Mahoosive restriction internally (unlikely in this case)

2) FUBARed starter motor (possible)

3) Insufficient electrickery to said starter (probable)

just my thoughts .. nowt else ..

[Webby the Bear]

Fair enough Nige.... just that when my CS went it would only act up when warm 

[Entwood]

Fair enough Nige.... just that when my CS went it would only act up when warm 

Quite probable .. but the engine ALWAYS turned over at normal speed (until you flattened the battery) .. just didn't fire ?? n'est-ce pas  ??

[Webby the Bear]

Fair enough Nige.... just that when my CS went it would only act up when warm 

Quite probable .. but the engine ALWAYS turned over at normal speed (until you flattened the battery) .. just didn't fire ?? n'est-ce pas  ??

Thinking about it you could be quite correct   

[ronnyd]

If starter motor was buggered then the engine wouldn,t turn over normally, would it?

[Entwood]

If starter motor was buggered then the engine wouldn,t turn over normally, would it?

Reply #3

Item 2

[BazaJT]

If starter motor was fubar'd would this not show up as a problem when the engine is cold or merely warm and not solely when the engine is hot?

[Entwood]

If starter motor was fubar'd would this not show up as a problem when the engine is cold or merely warm and not solely when the engine is hot?

"If" the problem was internal to the starter, it could be that, when warm and expanded an electrical contact is poor, or that something in the mechanical drive is expanding and sticking ... but IMHO it is unlikely, though not impossible

My thoughts agree with the early one .. check the earth straps and the battery contacts especially, then the connectors to the starter motor. Corrosion will give high resistance, and the hotter it gets the higher the resistance goes .. so the less current flows, and a slow-to-rotate starter is 90% low current IMHO

Its a 20 minute job to undo battery connectors, clean them up and refit, then do the same to the starter connectors. 

[05omegav6]

Mine sometimes suffers a delay between turning the key to position 3 and actually cranking... never looked into it, but considered that it may well be immobiliser related... key and and straight to crank before the barrel has registered that the key is there

[dbug]

Agree first check earth connections.  Could also be dodgy starter solenoid

[martin42]

Starter motor.

[Grrrrrr]

So, what was it? We're all on tenterhooks!