2009 Skoda Octavia 1.9tdi
Car starts perfect cold fires up after a second,when warm wont start

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stephen
Driver
1 points

Problem added: Jun 24, 2020 (5 months ago)
I have had this probelm 2 wks now,when cold the car will start no problem whatsoever,it is running perfect,when warm it cranks but stops and just conks out also pressing throttle has no effect , the only way to get going is to labour the starter to get it over 5k revs and it fires up then.I have changed fuel pump,coolant temp sensor,brought o another garage yesterday and they seem to think the crank shaft sensor,there is no faults coming up on diagnostic machine.I dont want to keep putting new parts in the car and still having the same problem,this problem only started 2 wks ago and no problems whatsoever with the car since i bought 3 yrs ago,there is only 118k miles on it and runs perfect apart from hot start problem,some say get it remapped to fix but that is not fixing the underlying problem infact one of remapping guys suggested it is mechanical.Can anyone help pleaseeeeeeeeee

Car details
Car: Skoda Octavia
Variant: 1.9tdi
Model Year: 2009
Category: Running Rough, Starting & Power Loss
Replies and Fixes
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whittingehame
Legend
15,927 points

Jun 24, 2020 (5 months ago)
Crank sensor CAN fail when hot causing non start .Changed the fuel filter ?
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stephen
Driver
1 points

Jun 24, 2020 (5 months ago)
Replying to post by whittingehame:
Crank sensor CAN fail when hot causing non start .Changed the fuel filter ?
Thank you for your reply, I am getting crank shaft sensor replaced tomorrow, I thought would be problems starting whether hot or cold if crankshaft sensor was going but I don't know much about them.
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whittingehame
Legend
15,927 points

Jun 24, 2020 (5 months ago)
Sometimes a good indicator if crank sensor is knackered or not is to see if the rev counter needle moves when cranking
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stephen
Driver
1 points

Jun 24, 2020 (5 months ago)
Replying to post by whittingehame:
Sometimes a good indicator if crank sensor is knackered or not is to see if the rev counter needle moves when cranking
On cold starts it does but hot starts no, it has no response unless u keep key turned labouring the starter to get over 5krevs then fires up and throttle is responsive...
Avatar
stephen
Driver
1 points

Jun 26, 2020 (5 months ago)
Hi,changed crank shaft sensor today and still same problem,mechanic said may be cam sensor,costing me a fortune at this stage and no fix,no faults coming up.
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whittingehame
Legend
15,927 points

Jun 26, 2020 (5 months ago)
If faulty , and scanned with appropriate diagnostic equipment , it should throw a fault code .
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stephen
Driver
1 points

Jun 26, 2020 (5 months ago)
Well this what i would have expected and thought,but no faults can be found,this 2 different mechanics looking for faults and neither can find problem.It is getting very expensive at this stage,changed fuel pump,coolant temp sensor,now crank shaft sensor and going to try cam shaft sensor :(
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