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V5 hot start issues


Best Answer jayartibee , 14 February 2021 - 12:42 PM

well the Trouble Code was actually correct this time. That's a bonus....

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#1 jayartibee

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Posted 10 December 2020 - 05:09 PM

Dear all -

 

fairly elderly V5 (10 valve) has developed intermittent non-start when hot. Have to wait about twenty minutes before it'll fire up (cranks nicely). Which is a bit boring.

 

What to check first do y'all reckon? MAF unit?

 

Jeremy




#2 northpole

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Posted 10 December 2020 - 08:06 PM

Vcds or the older vagcom... scan the ecu for faults it'll tell you where to start looking... but knowing the v engines 9 out of 10 times it's the coilpack or the coilpack regulator that causes the non start when hot.  



#3 Imagewerx

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Posted 11 December 2020 - 06:07 PM

Your post has been moved.Always ask technical questions in the relevant technical section.



#4 jayartibee

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Posted 16 December 2020 - 01:54 PM

So where should I have asked a question about the engine not starting, if not in the engine section?


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#5 thinkpad

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Posted 16 December 2020 - 04:04 PM

So where should I have asked a question about the engine not starting, if not in the engine section?

This is one area I completely agree with you. This forum is unnecessarily sub-divided to the extreme that it is very confusing where questions should go even for regular users, never mind newbies.



#6 adam-

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Posted 16 December 2020 - 07:50 PM

I think we just have to accept the gestapo we have.


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#7 jayartibee

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Posted 22 January 2021 - 12:29 PM

Vcds or the older vagcom... scan the ecu for faults it'll tell you where to start looking... but knowing the v engines 9 out of 10 times it's the coilpack or the coilpack regulator that causes the non start when hot.  

There is a P0668 error code - temperature sensor fault - I think that may be connected? Someone mentioned dodgy wiring below ECU?



#8 northpole

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Posted 24 January 2021 - 09:12 AM

you should check the wiring first yes, if that all checks out replace the sensor...  but as you also had the alternator problem chances are the lot is fine but the ecu jjust got random faults because of power not being sufficient...  I would start with replacing the alternator (you already bought a new battery) once that is done scan the ecu, remove all faults, scan again if there are still problems they will pop up, take it from there. 



#9 jayartibee

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Posted 12 February 2021 - 02:48 PM

Turned out to be crankshaft position sensor. Started cutting the engine after about 20 minutes. Local indy replaced for £70 all in. Win!


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#10 davecqd

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Posted 14 February 2021 - 11:12 AM

You're lucky your Indy found it so quickly,  first time mine went it took Vag main agent nearly two weeks get a fix !!!



#11 jayartibee

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Posted 14 February 2021 - 12:42 PM   Best Answer

well the Trouble Code was actually correct this time. That's a bonus....



#12 adam-

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Posted 14 February 2021 - 03:06 PM

You're lucky your Indy found it so quickly,  first time mine went it took Vag main agent nearly two weeks get a fix !!!

Likely because they just scanned it, had a fault code and did that item.  Your garage sounds like they're A, busy or B, actually doing diagnostics.  If it only happens after 20 minutes, that doesn't leave a big window of diagnostics. 


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#13 18tjetta

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Posted 18 February 2021 - 08:54 PM

Good tips

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