740 poor running and stalling

[Laird Scooby]

Originally Posted by griston64

I think for the sake of £10 I would order the o rings from Volvo. It's a cheap enough thing to eliminate the potential issue

FRF will also give you a discount if you quote code C3

The part numbers are 947113 and 947115

Gotta be worth a try

Chances are by the time you've paid extortionate P&P from Deutschland and more to HMRC it's cheaper to get them from the dealer anyway.

[Boatie]

Originally Posted by Beadybc

I did put in the VIN, was thinking that that set seemed to have more O rings than necessary.

And Boatie I wasn’t even born yet when that happened, let’s hope that we have a similar situation 20 years later.

&&&&&, I was middle-aged at the time.

To this day I say that if I could buy my old 740 SE new out of the factory I would.

Good luck

[Beadybc]

Originally Posted by Laird Scooby

Chances are by the time you've paid extortionate P&P from Deutschland and more to HMRC it's cheaper to get them from the dealer anyway.

Finally got the car back and we got some more detail from that receptionist. Apparently one of the guys found that: "There is a constant flow through injector 1 and the other 3 are showing signs of being weak"

Some images:

[Laird Scooby]

If you have fuel pressure and airflow through the fuel distributor, you should have constant flow through all the injectors. With that in mind, how were they testing things?

[Beadybc]

Originally Posted by Laird Scooby

If you have fuel pressure and airflow through the fuel distributor, you should have constant flow through all the injectors. With that in mind, how were they testing things?

Not sure, apparently he "stripped them out" to test the flow.

Here's the message:

"Yes no problem, the technician stripped the injectors out and there is constant flow of fuel through injector 1 and the remaining 3 injectors are showing signs of being weak. Injector one is the worst by far but we would only recommend replacing all of them due to weakness. We would then need to reassess once this problem was rectified."

[Laird Scooby]

Originally Posted by Beadybc

Not sure, apparently he "stripped them out" to test the flow.

Here's the message:

"Yes no problem, the technician stripped the injectors out and there is constant flow of fuel through injector 1 and the remaining 3 injectors are showing signs of being weak. Injector one is the worst by far but we would only recommend replacing all of them due to weakness. We would then need to reassess once this problem was rectified."

No clue as to what pressure they were running them on then?

[Beadybc]

Originally Posted by Laird Scooby

No clue as to what pressure they were running them on then?

Probably the receptionist still coming up with info

I still want to replace the O rings though, you can see what I think is the first one around the plastic case in the photos but isn’t there a second one?

[Laird Scooby]

Originally Posted by Beadybc

Probably the receptionist still coming up with info

I still want to replace the O rings though, you can see what I think is the first one around the plastic case in the photos but isn’t there a second one?

You have to get the plastic case off the injector to reveal the other "O" ring on the injector body. See the thread i linked to further up about it. Use silicone grease to help the new "O" rings on and so they don't snag as they're fitted - makes life much easier.

[Beadybc]

Originally Posted by Laird Scooby

You have to get the plastic case off the injector to reveal the other "O" ring on the injector body. See the thread i linked to further up about it. Use silicone grease to help the new "O" rings on and so they don't snag as they're fitted - makes life much easier.

Currently trying to loosen the nut that attaches the injector to the fuel line, it’s not reverse threaded is it? I know you didn’t say anything about reverse thread in that thread that you linked but just want to be sure because if not they’re on very tight.

[Beadybc]

I managed to get them off in the end I just took off the plastic covers first. The plastic cover for injector 4 actually came off with the big O ring attached to the inside and the one that goes on the outside of the plastic cover is sort of molded to the cover as you can see in the photos.