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Cold start time longer after injectors replaced

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Old Jul 4th, 2020, 18:43   #1
Moonhammer
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Question Cold start time longer after injectors replaced

Hi Folks,

My XC90 (2011) 2.4l D5 had its head off and all 5 injectors replaced recently. I had Volvo ‘re-code’ the new injectors into the ECU shortly after.

Since having the car back, I notice that the cold start time has increased from a quick 1-2s to a much more noticeable 4-5s. It idles smooth and the driving performance is great. I’m still concerned that the increased cold start time is symptomatic of another underlying problem. There is no warning lights and no faults on Vida.

This is what I have checked so far:

1. Glow plugs tested (all 0.7ohm to chassis). Glow plug module confirmed ok.
2. Battery fully charged overnight using battery charger. No difference with cold start.
3. Injector leak back test. All fine.
4. Fuel filter was changed only 3 months ago.

What else could this be ? Am I be overly concerned ?

Appreciate any comments.

Thanks

Last edited by Moonhammer; Jul 4th, 2020 at 19:01.
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Old Jul 5th, 2020, 15:17   #2
JohnL
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I think you need to check the fuel pressure with just the key on, before start, the pump in the tank should prime the main pump to a set pressure, if you dont get that pressure the main pump has to turn much more longer before it generates enough pressure to start. There is a minimum valve here in Vida.
I wonder if there could be air trapped in the common rail and acting as a cushion perhaps? Be careful if testing as there is a huge pressure there!
Was it a genuine Volvo fuel fitted, it may also be a slight air leak there?
I wonder if the pipes are in the places after the head has been off?
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Old Jul 5th, 2020, 19:40   #3
Moonhammer
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Thank you for your thoughts John. I was starting to get think more about the fuel system too.

A few quick questions if you don’t mind:
1. Is there an easy way (without using Vida) to confirm if the pre-start fuel pump is functioning? I.e can I find it and observe it operating ?
2. Is there a way of bleeding air out of the fuel line near the engine? The engineer in me says that a bleeding point would be more likely on the low pressure side of the fuel manifold.
3. I am in the process of setting up Vida on my laptop (slow process with pitfalls galore). Can the fuel manifold high pressure sensor data be acquired through Vida ? What would an acceptable prestart pressure be ?

Many thanks.
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Old Jul 5th, 2020, 21:48   #4
JohnL
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Answers to your questions,
1, just with the key on and quiet inside the car I can just hear my pump running, you could perhaps hear the tank pump run for a few seconds, not exactly sure how long it does run for, and also you need Vida to read the pressures.
2, I suppose you are right, the low pressure side should push the fuel and air into the main pump and so bleed itself.
3, You will be able to see the the low pressure and the high pressure, but I dont remember the figures sorry, its all in Vida.
Do you have a specific problem with loading Vida? There are many basic requirements that are needed, A forum member Cheshire does have a lot of info and is very helpful.
John
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