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Hot start problem 2
Posted: 03 Dec 2010, 16:40
by eatcustard
Have van serviced
replaced the temperature sender for the injectors
all runs fine.
but will still not start when hot.
what else should I be looking for
Re: Hoty start problem 2
Posted: 03 Dec 2010, 16:44
by Nicola&Tony
Starter motor and its connections?
Tony
Re: Hoty start problem 2
Posted: 03 Dec 2010, 16:48
by eatcustard
No it spins over fine
Just will not fire up (leave it 15 mins and if fires up)
fuel not getting in, may be?
ignition module?
Re: Hot start problem 2
Posted: 03 Dec 2010, 18:53
by kevtherev
same on both fuels?
Re: Hot start problem 2
Posted: 03 Dec 2010, 18:57
by eatcustard
kevtherev wrote:same on both fuels?
can only start on petrol
Re: Hot start problem 2
Posted: 03 Dec 2010, 19:14
by kevtherev
won't start on LPG at all by design then?
Re: Hot start problem 2
Posted: 03 Dec 2010, 19:19
by eatcustard
By design
Re: Hot start problem 2
Posted: 03 Dec 2010, 19:21
by kevtherev
I believe HOT injection engines need full throttle when you turn the key. if it does, it would suggest there's not an over fuelling problem
possibly temp 2 sensor if that is a problem
Re: Hot start problem 2
Posted: 03 Dec 2010, 19:26
by eatcustard
kevtherev wrote:I believe HOT injection engines need full throttle when you turn the key. if it does, it would suggest there's not an over fuelling problem
possibly temp 2 sensor if that is a problem
new temp 2 sensor has been fitted
foot to floor, still does not help
Re: Hot start problem 2
Posted: 03 Dec 2010, 19:28
by kevtherev
OK
disconnect the fuel pump then start with full throttle to check if it's over fuelling
should be enough pressure in the system to get it to fire up
if this fails we're on to air mass meter or ECU I would guess at
Re: Hot start problem 2
Posted: 03 Dec 2010, 19:37
by eatcustard
Thanks
will give it a go
Re: Hot start problem 2
Posted: 03 Dec 2010, 19:41
by kevtherev
another check
disconnect the temp 2 when it's warm... not hot then try starting, just a check for the sensor, it should be difficult
temp 2 was from Brickwerks was it?
Re: Hot start problem 2
Posted: 03 Dec 2010, 19:45
by eatcustard
kevtherev wrote:
temp 2 was from Brickwerks was it?
Yes
Re: Hot start problem 2
Posted: 03 Dec 2010, 19:50
by kevtherev
great
can you get or rather borrow an ECU..? (I wish the club could invest in a borrowable on )
Re: Hot start problem 2
Posted: 03 Dec 2010, 20:02
by kevtherev
just did a search on thesamba..
look up and consider a "hot start Relay" as there is often a Voltage drop from the ageing VW wiring from the battery to the Key switch to the starter solenoid. this relay provides the starter with as close to full voltage as possible.
Also note there is a wire FROM the starter TO the "double Relay" on the firewall, that runs the Fuel pump "while Cranking"
have an assistant check to see (hear) if the fuel pump is running/priming during cranking. it's located under the sliding door by the frame rail, should Bzzzz and such.
if you get it to crank and fire but won't stay running. often there's an issue with the 'fuel pump' switch in the AFM (air flow meter) on the air cleaner housing.
inside there are 2 contacts that touch when the engine is sucking air thru and continues the power to the fuel pump after the Double relay is done with the cranking, kind of a hand off aspect but sometimes needs a little help.
also the cold start valve was discussed.. in being that a leaky valve would cause issue