2007 XC90

rssherwin1 · Post by **rssherwin1** » 14 Dec 2023, 06:26

I recently replaced the injectors on my wife’s XC 9 3.2 L front wheel drive car. The car has 140,000 miles on it and ran fine prior to changing the injectors. The reason for changing the injectors was I received a lien bank one and lean bank two code, upon further inspection, using brake cleaner as I sprayed one of the injectors, it caused the engine to have a misfire code appear. I could’ve just changed the O-rings, but I figured with the amount of mileage on it it would be better just to go ahead and change the injectors. After changing the injectors, I did not bleed the fuel rail and noticed the car took about 20 seconds to start. This has continued since the repair when the car is cold. When the car is hot, it starts with just a bump of the key like it did when the original injectors were in the car I see no performance issues with the vehicle, after the engine is started. The parts were purchased from FCP Euro which I’ve ordered from before and never had an issue with parts they provided. Do I need to bleed the fuel rail to get an air bubble out or should I assume that the injectors provided are faulty? This is not a diesel engine.

chitownV · Post by **chitownV** » 18 Dec 2023, 18:34

No need to bleed the fuel rail when installing new injectors.

You could try to reinstall the old injectors yet use o-rings from the new injectors. If you are getting lean both banks then it might be time for you to change the PCV.

To understand the proper maintenance for the 3.2, see the link: https://www.swedespeed.com/threads/the- ... st-7332383

As far as buying from FCP, there was a 2.5t owner who had injectors drop shipped via FCP and they were wrong. He mentioned it to FCP and they handled the replacement directly from their warehouse.

However, poor starting when cold versus when hot may not be the injectors. Besides the PCV that could affect the lean codes and should have been replaced by 140k miles, you may also need to change the fuel filter. If that still has the same issue, then look into the fuel pump.

What is the maintenance history of the 3.2 XC90? Most, if not almost all, issues that arise in XC90s are usually due to delayed maintenance.

rssherwin1 · Post by **rssherwin1** » 18 Dec 2023, 18:47

I changed the fuel filter and the PCV was changed 12 months ago exactly. It was changed with a dealer part the entire cover with PCV not just the valve internals. I tried changing the injector o-rings on the factory ones that didn’t fix it. I also changed the mass air sensor which didn’t fix it. I sprayed carburetor cleaner on the intake piping all connections around the intake around the PCV valve and its housing and the injectors and there was no noticeable change in engine operation. I also cleaned the gas filler spout and orings on the gas cap oil dip stick and oil filling cap. Would you have any other ideas of what it could be. I made an appointment at the dealership but would prefer to fix it myself (sense of accomplishment issue). If it is the PCV it’s under warranty for 12 more months since this was a dealer part. I just find it hard to believe that a new part could fail that quickly.

Post by **pgill** » 19 Dec 2023, 08:58

Take a look at this link for a LR2 with same 3.2 as your XC90

https://landroverforums.com/forum/lr2-3 ... mp-115558/

Measure how low the voltage dips at the battery when cold starting and when hot starting and post your findings here.

Good Luck

Paul

rssherwin1 · Post by **rssherwin1** » 19 Dec 2023, 10:05

12.52V not running cold
14.40V running cold start
Turn engine off check voltage and restart 30 sec of time laps between cold running and hot not running voltage test.
13.20V hot not running
14.40V running hot start

Not sure if this is what you meant but I used a fluke 87 iii true RMS multimeter to obtain these readings.

I got to thinking about it and I’m probably describing it wrong the initial start is a cold start any start following even if it only ran a few seconds from the initial start are hot starts to me as the car has been started once within a short period of time without sitting for like 1 hour

Post by **pgill** » 19 Dec 2023, 11:15

With the Starter motor engaged what does the voltage dip to?

Post by **pgill** » 19 Dec 2023, 11:55

rssherwin1 wrote: ↑19 Dec 2023, 10:05 I got to thinking about it and I’m probably describing it wrong the initial start is a cold start any start following even if it only ran a few seconds from the initial start are hot starts to me as the car has been started once within a short period of time without sitting for like 1 hour

I am going to restate what you wrote

Let me know if this is accurate

Condition 1 - the fuel system has residual pressure in the fuel line (and the fuel line is warm) and if the engine is started it will start immediately and it will run on this residual pressure for several seconds until the ECU confirms that the engine is running and it take over control of the fuel pressure. This change over is transparent to the user but if you monitor the current draw by the fuel pump module you will see it..

Condition 2 - the fuel system has no residual pressure and the fuel and fuel lines are cold, in this case only the priming of the fuel pump will generate the initial fuel pressure and the engine will only run very briefly and the ECU must command the fuel pump to run and it will not do that if it doesn't get the needed signals from the engine.

Good luck

Paul

Post by **pgill** » 19 Dec 2023, 11:59

Here is an interesting link from 2017

https://www.freel2.com/forum/topic29593.html

As soon as I saw that the starting delay corresponded directly to the current flowing to the fuel pump module I stopped worrying about it.

This is as the Volvo engineers intended it to be.

And only Land Rover owners with Volvo Engines even notice the delay.

I may need to edit my post to include "A Few Volvo Owner's on MVS might notice"

Thanks

Paul

rssherwin1 · Post by **rssherwin1** » 19 Dec 2023, 13:03

Yes Paul that sounds correct however this was accompanied by a P0171 & P0174 bank 1 & 2 lean condition. The only misfire code was due to spraying carburetor cleaner on injectors indicating a bad o-ring so I changed the injectors which did not solve the problem. After giving it some thought lean means to much unmeatered air or to little gas so I changed the fuel filter and the mass air sensor which also did not solve the problem.

Post by **pgill** » 20 Dec 2023, 11:56

The most likely cause for P0171 and P0174 is the PCV and I believe that you have a Volvo part. Edit: you had Volvo replace this about a year ago so it is unlikely that it has failed so soon.

I would check to make sure that the bolts are tight because I found loose bolts on my S80 PCV and I assume that the previous owner used the dealer.

Have you completed the glove test?

https://www.freel2.com/forum/topic37372 ... glove+test

However anything that creates a false air leak after MAF can cause those codes

Some thing like this

And a broken MAF can cause this but I think you already replaced the MAF.

Another thing to consider is an exhaust leak upstream of the O2 sensors.

Good luck

Paul