740 and 264 probs

Roo · Post by **Roo** » Wed Sep 21, 2005 9:22 am

Had my dad on the phone last night with a couple of probs.
Firstly his 740 GLE Auto 'F' reg has a starting fault.
After running the car up to normal operating temperature all is fine. However, if you stop the engine and leave for 5-10 mins, eg when refueling, the car is very difficult to start and once started it idles very roughly on 2 then 3 then 4 cylinders. this sorts itself out after about 40 seconds and the car is fine again until it is stopped and started again. There is also a strong fuel smell round the passenger rear door area too. I guess these could be connected?

The car had new injector oil seals last year and this was initially thought to have helped but now that seems doubtful.

Second prob!
My grandads 264 GLE auto V6 'V' reg has a starting fault. When cold the engine starts fine and idles ok but when you apply any load like turn the power steering or touch the throttle, the engine stalls. After a few minutes of idling, the car is fine and drives well, its only when the cars engine is cold.
Any ideas?

I love this new section!

Ally · Post by **Ally** » Wed Sep 21, 2005 10:26 am

On the 740, I'd have a look at the in-tank lift-pump - could be slow to build up pressure in the fuel rail?. I had to replace mine because the originals were steel pipes welded to a plate which rusted at the welds. The replacement is all moulded plastic, but I seem to remember having to mod the hoses a bit to get it all connected. There's an inspection hatch in the forward part of the boot area (underneath the plywood lining (concealed nuts behind back seats, lift and slide forwards)).

Maybe even fuel filter?

If it's dodgy starting especially when hot, check the little plastic flame trap in the crankcase breather hose. It clogs up and causes problems on a fairly regular basis in my experience. You can just clean it out, but they're only a quid or something from volvo - if you're feeling lazy.

Does the F reg have the diagnostic thing on the strut? Mine has, but usually proves pretty useless although it can give some hints in what direction to be looking.

Hope this helps...

Roo · Post by **Roo** » Wed Sep 21, 2005 10:41 am

Thanks Ally, i'll pass that on to my dad and see what he says...

martinholmesuk · Post by **martinholmesuk** » Wed Sep 21, 2005 11:00 am

both sound like engine temp sensor problems. I had the problem of not starting when hot.

OK when cold but putting to much fuel in when hot.

Mark 480s · Post by **Mark 480s** » Fri Sep 23, 2005 10:59 am

Hi Roo

The 740 GLE is it the Bosch mechcanical fuel injection (Bosch K injection system)? if so it could be the start enrichment injector. this is controlled by a simple heat/timer relay mounted on the engine block. when the block is cold it provides additional fuel for a couple of minutes or until the block is warmed up. When it goes wrong it dumps loads of extra petrol into the engine causing bad running and starting when warm, because the mixture is far to rich.

regards

Mark

chris1roll · Post by **chris1roll** » Fri Sep 23, 2005 3:44 pm

Mark 480s wrote:Hi Roo

The 740 GLE is it the Bosch mechcanical fuel injection (Bosch K injection system)? if so it could be the start enrichment injector. this is controlled by a simple heat/timer relay mounted on the engine block. when the block is cold it provides additional fuel for a couple of minutes or until the block is warmed up. When it goes wrong it dumps loads of extra petrol into the engine causing bad running and starting when warm, because the mixture is far to rich.

regards

Mark

WE had the exact same problem with ours, the cold start injector had become jammed open (you could blow through it) and it actually filled the intake up with petrol, which was nice.

In actual fact it is wired off the starter circuit, then through the temp sensor on the block, so the injector should ony open when the starter is engaged and the block is sufficiently cold to require it. At least on our 1987 E plate one.

huskyracer · Post by **huskyracer** » Fri Sep 23, 2005 5:59 pm

The most common thing I see that causes this fault on k-jet cars is the injectors dripping. when you switch it off, the injectors drip causing a collection of fuel in the manifold/intake port, when you start it it draws this in which makes it go very rich for a couple of seconds, and the car will run on 2 or 3 cylinders untill the metering head can build enough pressure in the pipes to the injector/s to open them again. remove the injectors, place each one in a milk bottle with the pipes conected, brdge the fuel pump relay out and pull the flap in the metering head up, this will make the injectors spray, you only need to do this for a second or so, just to build pressure in the pipes. remove the bridge from the pump relay and watch the injectors to see if they leak. more than a couple of drips in 5 minutes means there shot.
Hope that helps
Iain

chris1roll · Post by **chris1roll** » Fri Sep 23, 2005 9:03 pm

Sounds exactly like ours!

Still, with being a "communal" car, and 200k on the clock, It'll have to put up with them.

Roo · Post by **Roo** » Wed Sep 28, 2005 9:24 am

Roo wrote: Second prob!
My grandads 264 GLE auto V6 'V' reg has a starting fault. When cold the engine starts fine and idles ok but when you apply any load like turn the power steering or touch the throttle, the engine stalls. After a few minutes of idling, the car is fine and drives well, its only when the cars engine is cold.
Any ideas?

Anyone shed any light on this one?
Also, this prob seems worse when the car has not been started for a couple of days.

Will be passing 740 info to my dad later so will let you know what happens...

Volvo 480 Club Europe

740 and 264 probs

740 and 264 probs

Re: 740 and 264 probs