262 General: V6 not starting

[Laird Scooby]

Originally Posted by 1978

I have finally got around to starting the Volvo after fitting the new injectors, it just cranked and cranked, thought it might have needed bleeding until I cracked open the few injector connections to see air bubbles. Still would not start, so unscrewed the fuel line to the filter to find no fuel at all. It was out of gas So much for the fuel gauge showing 1/4 tank!
Fed a gallon of gas in her and after a few cranks she started. Then after a couple of minutes she started to run rough and rougher like she was over fuelling to the stage that it was hunting badly and choking herself up with fuel. It would clear if I revved the engine high but when it came back to idling it was back to hunting badly and after about 6 minutes it ran out of gas again.
I was thinking that the cold start valve had stuck open, I disconnected what I think is the cold start valve wiring but it still sounded like it was on full fuel.
Not being familiar with the engine component's, is there another part to disconnect to try and stop this over fuel issue.
Many thanks Peter

If it drank a gallon of petrol in 6 minutes, that's definitely over-fueling!

As for the cold start injector potentially being jammed open, if it is the clue is in the statement - removing the power feed to it won't alter it if it's physically stuck open.

However i think your problem is a bit more basic than that. I suspect because the original injectors were so dirty/gummed up, the mixture was progressively richened over the years to give a satisfactory idle. Bear in mind there is no closed loop mixture feedback as with a Lambda sensor and ECU, once the misture screw is set to rich, it stays there until altered again.

Imagine new injectors capable of flowing what they should running on a fuel distributor set to excessively rich to compensate for previously blocked injnectors!

You see where i'm going with this? It could also be the warm-up regulator on the fuel distributor but let's go for the most likely first. Find the mixture screw (3mm Allen key should fit) and turn it 1/3 turn (2 flats on the Allen Key) anticlockwise, refuel and try again. As it warms up , if/when it starts to run rough again, turn the Allen Key in 1/3 turn increments until it remains smooth. If you find it goes lean by turning 1/3 of a turn, go back halfway to where it was before (1/6 turn/1flat) clockwise.

Keep doing this until it warms up completely and runs satisfactorily, if you then have cold start problems it's time to look at the cold start injector but that might be working ok.

[1978]

Originally Posted by Laird Scooby

If it drank a gallon of petrol in 6 minutes, that's definitely over-fueling!

As for the cold start injector potentially being jammed open, if it is the clue is in the statement - removing the power feed to it won't alter it if it's physically stuck open.

However i think your problem is a bit more basic than that. I suspect because the original injectors were so dirty/gummed up, the mixture was progressively richened over the years to give a satisfactory idle. Bear in mind there is no closed loop mixture feedback as with a Lambda sensor and ECU, once the misture screw is set to rich, it stays there until altered again.

Imagine new injectors capable of flowing what they should running on a fuel distributor set to excessively rich to compensate for previously blocked injnectors!

You see where i'm going with this? It could also be the warm-up regulator on the fuel distributor but let's go for the most likely first. Find the mixture screw (3mm Allen key should fit) and turn it 1/3 turn (2 flats on the Allen Key) anticlockwise, refuel and try again. As it warms up , if/when it starts to run rough again, turn the Allen Key in 1/3 turn increments until it remains smooth. If you find it goes lean by turning 1/3 of a turn, go back halfway to where it was before (1/6 turn/1flat) clockwise.

Keep doing this until it warms up completely and runs satisfactorily, if you then have cold start problems it's time to look at the cold start injector but that might be working ok.

Thank you again Laird Scooby, yes this does make a lot of sense now, that's tomorrow's job sorted then

[Laird Scooby]

Let us know how it goes!

[1978]

It may seem like a daft question but where is this small mixture screw.
I have a small screw in front of the fuel distributor which is screwed as far down as it will go, I can unscrew it anticlockwise but it is so loose in the threads I can unscrew with my fingers, so guessing isn't the mixture screw?

[AndrewBrown]

Originally Posted by 1978

It may seem like a daft question but where is this small mixture screw.
I have a small screw in front of the fuel distributor which is screwed as far down as it will go, I can unscrew it anticlockwise but it is so loose in the threads I can unscrew with my fingers, so guessing isn't the mixture screw?

do these pictures help
https://www.landiss.com/graphics/adjust1.jpg

https://ww2-secure.justanswer.com/up...fuel_dissy.gif

https://i25.photobucket.com/albums/c...istributor.jpg

you might want to check the state of the oil seeing its been gulping down loads of fuel in a short space of time you may have some in the oil

hope this helps

[1978]

Originally Posted by AndrewBrown

do these pictures help
https://www.landiss.com/graphics/adjust1.jpg

https://ww2-secure.justanswer.com/up...fuel_dissy.gif

https://i25.photobucket.com/albums/c...istributor.jpg

you might want to check the state of the oil seeing its been gulping down loads of fuel in a short space of time you may have some in the oil

hope this helps

Many thanks Andrew, looking at the diagram and photo the screw I found comes out and the mixture screw is further down.
I was a bit afraid to take this screw completely out just in case it released something.

[1978]

Many thanks guys, this certainly helped with running super rich, was able to lean it off so it would idle better, haven't had a chance to wait until she is warmed up so I can re-adjust, There is a massive water leak coming from somewhere too. Once I get it back up on the ramp I wont be able to sort the running rich when warm check. At least its a lot better now

[Laird Scooby]

Originally Posted by 1978

Many thanks guys, this certainly helped with running super rich, was able to lean it off so it would idle better, haven't had a chance to wait until she is warmed up so I can re-adjust, There is a massive water leak coming from somewhere too. Once I get it back up on the ramp I wont be able to sort the running rich when warm check. At least its a lot better now

That's good news and progress in the right direction.

I'm guessing you haven't checked the cold start because of the water leak?

[1978]

Originally Posted by Laird Scooby

That's good news and progress in the right direction.

I'm guessing you haven't checked the cold start because of the water leak?

Thanks Laird Scooby slowly getting there.
I managed to find the water leak, heater hose.
I removed the cold start valve and got my wife to crank the engine and fuel sprayed out of the cold start valve in a nice cone shaped spray. Tried this again with the wire disconnected and the fuel did not spray out so assume this is working as it should, only this time the engine started up and revved its nuts off until
I shouted to her to turn it off. I guess it was the valve being out that caused this as when I refitted it it ran okay, but still was a bit rich. Now that I have the water leak under control I will put some more fuel in the tank and bring her up to normal running temperature and re-adjust the mixture control and see what happens next.
I will let you know how things go.

[Laird Scooby]

All sounds good with the CSI so hopefully (water leak permitting!) you can tweak the mixture as it warms up and all will be good afterwards.