VW T5 hard start

beanie10

Hi all. I need some help with this. I have a 2006 T5 Transporter with 260,000 miles. Van takes 5-8 cranks before it starts whether its warm or cold.
A mechanical plugged computer into it and showed up crankshaft sensor which was replaced with genuine VW sensor. This made no difference. He then changed 2 temp sensors(1 at bottom radiator and 1 on side of engine), still no Difference. Fuel filter has been changed and again no difference.
For last couple of years it has been hard start only lying up overnight but always started straight away when after that.

Does anybody have any suggestions? A lad suggested checking the wiring loom for a broken cable on the loom that runs along the front of the engine and up over the starter motor but that looks like a stab in the dark.

iamtony

Glow plugs are a possibility.

P.s get a new mechanic he shouldn't be guessing at your expense.

visual

iamtony wrote: »

Glow plugs are a possibility.

P.s get a new mechanic he shouldn't be guessing at your expense.

Fuel pump would be my guess. Small leak that allowing air in over night and fuel drain back towards tank. The extra turns from cold is drawing the fuel back up to injectors

iamtony

visual wrote: »

Fuel pump would be my guess. Small leak that allowing air in over night and fuel drain back towards tank. The extra turns from cold is drawing the fuel back up to injectors

Good suggestion, this can be tested handy enough through VCDS by priming the system. Also cycling the key several times before turning it over should prime it a bit also.

Chimaera

I'd start with the wiring to the crankshaft sensor if that was being reported in diagnostics. A continuity tester, wiring diagrams and some patience are all you need.

iamtony

Chimaera wrote: »

I'd start with the wiring to the crankshaft sensor if that was being reported in diagnostics. A continuity tester, wiring diagrams and some patience are all you need.

Depends if the fault cleared after a reset really and the sensor being replaced.

beanie10

iamtony wrote: »

Depends if the fault cleared after a reset really and the sensor being replaced.

The fault cleared after replacing sensor. Turning ignition on couple times before starting makes no difference even though I can hear fuel gushing up. Still hard start if I start it straight after turning it off.

iamtony

beanie10 wrote: »

The fault cleared after replacing sensor. Turning ignition on couple times before starting makes no difference even though I can hear fuel gushing up. Still hard start if I start it straight after turning it off.

Any other symptoms? Low on power, Black smoke, or a smell after it starts anything like that?

beanie10

iamtony wrote: »

Any other symptoms? Low on power, Black smoke, or a smell after it starts anything like that?

No it drives perfect, no leaks. There is a small bit of blue smoke when started.

Mike2k

Have you tried changing the looms to the glow plugs instead of the glowplugs themselves?

getaroom

ok, here is my tupence worth. tomorrow morning, turn on the fan before turning on the ignition. Van should be easier to start.

I would suggest that your egr valve is filthy and should be cleaned. Once this is done, stick a blanking plate on the egr. Then clear the codes. Straight forward.

doodledandy123

beanie10 wrote: »

Hi all. I need some help with this. I have a 2006 T5 Transporter with 260,000 miles. Van takes 5-8 cranks before it starts whether its warm or cold.
A mechanical plugged computer into it and showed up crankshaft sensor which was replaced with genuine VW sensor. This made no difference. He then changed 2 temp sensors(1 at bottom radiator and 1 on side of engine), still no Difference. Fuel filter has been changed and again no difference.
For last couple of years it has been hard start only lying up overnight but always started straight away when after that.

Does anybody have any suggestions? A lad suggested checking the wiring loom for a broken cable on the loom that runs along the front of the engine and up over the starter motor but that looks like a stab in the dark.

Hi, I am glad to find some one else with same problem as me, 132.000 on clock so far I have tried everything, mechanic said its injectors .. injectors just done, collected van, same as before, if you could advise as to how you got on, id be grateful.

Waterson

You do really need to get someone to plug in VCDS and get some live data when cranking; fuel rail pressure, EGR valve position feedback, etc. i wouldnt be thinkng glowplugs as the ECU probably isnt using them in this mild weather.

dieselbug

You should start a new thread, latching on to an old one puts some people off.

Give as much detail as possible, year of van, engine size, symptoms of the problem, service history, any work done so far and any fault codes showing. The more detail the better.

It's a PD engine so rail pressure doesent apply. You need to bring it to someone who is familiar with these engines and their issues and equipped to test fuel supply etc.

getaroom

i cleaned out egr and put on blanking plate.
worked fine for a few months. NOTE nothing came up on the vagcom.
I was advised to remove plate before DOE, this I did.
The sluggish starting happened again.

Blanking plate is back on, and no heavy smoke when i take off at traffic lights.

George Dalton

Which engine is in your T5?

doodledandy123

this van will be the death of me yet!! mechanics are all scratching their ..... surely it even sounds fuel related, but told I am not a mechanic. van runs perfectly when going, but start on hill and from cold . . . . .

show me the money.1

Does it start ok from cold?

doodledandy123

no it wont start from cold, or a hill, 4 weeks now and were no further!

show me the money.1

When it is cranking check the live data and see if it is going over 350rpm in needs to be close to this to crack the injectors.

Also check if there is a voltage drop when cranking this will be caused by a loose wire from battery to starter/alternator if they are ok and you get a significant voltage drop a dodgy starter is the issue.

Just where I would start, if you have no fault codes.