hard to start when its warmed up

[MontieVHSL/E]

i have had this problem since i bought the car 7 months ago, it starts first thing when its cold, it will still start up after being off for about half an hour but after an hour or so it takes a bit of cranking to start and then kinda splutters into life.
any ideas?

thanks

[Harvs82]

i have had this problem since i bought the car 7 months ago, it starts first thing when its cold, it will still start up after being off for about half an hour but after an hour or so it takes a bit of cranking to start and then kinda splutters into life.
any ideas?

thanks

Perhaps check the oxygen sensor(s). Are you getting any black smoke on startup when warm? Could be an indication of the engine running way too rich. Also check out the coolant temp sensor, it could be giving the wrong info to the ECU, also creating a rich mix.

[Reggie]

yeah it sounds like a fuel prob. too rich to me also. ummm maybe leaking injectors,just a thought.when it starts does it blow black smoke?

[Reggie]

try this, just to rule out leaking injectors. before you turn the car off take out the fuel pump relay. let the fuel system run dry and stall the engine. leave it for an hour, put the relay back in flick ignition on for five seconds do this a couple of times to get pressure back, then start it.

[MontieVHSL/E]

it doesnt blow smoke, i have looked for that. how would i check the coolant temp sensor?

[89 calais]

Just a little trick you can try,take the car for a good drive and get it hot then make sure your back home when you turn it off.Try starting and if still the same problem pour water over your crank angle sensor.They have been known to cause this type of problem when they are old and overheat,then try starting the car again.If this is the problem the car will start easier,and if so replace your crank angle sensor,hope this helps!

[greenfoam]

Leaky injector/s maybe

[slayer]

coolant temp sensor wheres that located

[tlndofa]

IT IS YOUR CRANK SHARFT SENSOR,this does not start the car when warm if damaged but easy cold,tip water on it to start car first kick,2lt...is behind the harmonic balancer,bottom wheel of belt. (wire to it).ser 2 has plastic coating on it which tends to give protection but shorter life,also check trany oil ,may be low,an caused the problem...30$ for second hand sensor max..50$ labour max ...well after reading posts 89 calias is so correct.

[pandaman]

As a couple of people have mentioned, if it starts when cold but is an absolute bastard when it's warm, the crank angle sensor is a common culprit and would be the first thing I'd check. As they have also stated, it's easy enough to diagnose that particular fault as well, just pour some water over it when it's decided not to start and if it starts afterwards then hey presto! If not then you've just narrowed down the possibilities with no expenditure.

[greenfoam]

Anyway has anyone else noticed it hasn't even been said what engine this is? I'm assuming injected 5 liter in the VH SLE but for all I know that has a carby 304 in it and hes talking about a V6 VN

[pandaman]

Anyway has anyone else noticed it hasn't even been said what engine this is? I'm assuming injected 5 liter in the VH SLE but for all I know that has a carby 304 in it and hes talking about a V6 VN

Woops, I'd assumed a v6 vn because it was in here, well picked up. If it's a carby 8 then thats a really weird problem and I have no idea what's wrong with it, usually the buggers are more difficult to start when cold. If it's an injected 8 then thats a really weird problem and I have no idea what's wrong with it, although common sense would seem to be pointing to the fuel side of things.

[MontieVHSL/E]

hey thanks for all the help guys! i havnt had time to do anything about yet. it is a vn 5ltr engine (injected). sorry i guess it was assumed, i should have mentioned that.

[hazza]

I have the same problem but apparently in my case it has something to do with the gas computer. It seems to put both gas and petrol in at the same time. What can i do!!!!

[HoZy]

IT IS YOUR CRANK SHARFT SENSOR,this does not start the car when warm if damaged but easy cold,tip water on it to start car first kick,2lt...is behind the harmonic balancer,bottom wheel of belt. (wire to it).ser 2 has plastic coating on it which tends to give protection but shorter life,also check trany oil ,may be low,an caused the problem...30$ for second hand sensor max..50$ labour max ...well after reading posts 89 calias is so correct.

It's called a Crank Angle Sensor aka CAS...

Get your facts right mate.

Cheers
MaT