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xc90 2.5t with dead #3 cylinder

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
hoboken
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xc90 2.5t with dead #3 cylinder

Post by hoboken » Wed Feb 05, 2020 10:22 am

i have a 2004 xc90 2.5t with dead #3 cylinder(low compression) how far could i drive it ? 500 miles? and if i do do i need to be worried about loading the catalytic converter with gas and starting a fire? and if so is there a way to turn of the gas to #3 cylinder?

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RickHaleParker
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Re: xc90 2.5t with dead #3 cylinder

Post by RickHaleParker » Wed Feb 05, 2020 11:17 am

hoboken wrote: ↑
Wed Feb 05, 2020 10:22 am
is there a way to turn of the gas to #3 cylinder?
Disconnect the wiring harness from injector #3.
Platform: P80 1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0,
Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

wanderdĂĽne
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Re: xc90 2.5t with dead #3 cylinder

Post by wanderdĂĽne » Wed Feb 05, 2020 11:26 am

How low is the compression on cylinder 3? And do you know why?

But yes, one could unplug the injector and the coil pack and run it if it had no compression, but probably it would be a good idea to unplug the injector, remove the spark plug and also the coil if there is any compression in the cylinder. I think that if the spark plug were left in and it had some compression, it would send too much air to the cat and make it run hot. Probably would sound a little crazy while running, but hey. The more modern cars that cut a cylinder for fuel economy also relieve the compression through the valves along with other computer adjustments.

Disclaimer: I'm not saying this is a proper thing to do, it's just a theory. This is just my opinion, not advice. Running a car with a dead cylinder could be dangerous for a variety of reasons. What you do to modify your vehicle is your choice.

hoboken
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Re: xc90 2.5t with dead #3 cylinder

Post by hoboken » Wed Feb 05, 2020 11:58 am

wanderdüne wrote: ↑
Wed Feb 05, 2020 11:26 am
How low is the compression on cylinder 3? And do you know why?
26 psi with all other plugs pulled on #3. dealer put a camera in cylinder and said it had a chipped valve.
i should also say it has 215k on milage

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Re: xc90 2.5t with dead #3 cylinder

Post by cn90 » Wed Feb 05, 2020 9:36 pm

My 1998 S70 GLT burned valve #3 at around 180K miles (this was in 2018).
I unplugged the wiring connector to fuel injector #3.
At idle, car was vibrating a bit but at highway speed, it is hardly noticeable.

Then the trans lost reverse at 188K miles, that was when I ditched the car.

So, yes, unplug #3 and turn that into a "grocery getter"...
2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+

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SuperHerman
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Re: xc90 2.5t with dead #3 cylinder

Post by SuperHerman » Thu Feb 06, 2020 7:21 pm

If the car is worth $500-600 bucks to you, pull the head and fix it. Fluids, head gasket, a new/used valve, machine work and new valve stem seals and lapped valves will have you back on the road, plus all the seals are easy to replace. It is not that bad a job if you do it yourself. The engine is darn good and with a new top end you should get another 100k from the transmission. My sister left hers at 250k-ish b/c the power steering rack was more than she could afford.

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Re: xc90 2.5t with dead #3 cylinder

Post by hoboken » Fri Feb 07, 2020 3:34 pm

SuperHerman wrote: ↑
Thu Feb 06, 2020 7:21 pm
If the car is worth $500-600 bucks to you, pull the head and fix it. Fluids, head gasket, a new/used valve, machine work and new valve stem seals and lapped valves will have you back on the road, plus all the seals are easy to replace. It is not that bad a job if you do it yourself. The engine is darn good and with a new top end you should get another 100k from the transmission. My sister left hers at 250k-ish b/c the power steering rack was more than she could afford.
it is, but i don't have a place to do the work. but the machining of the head would be expensive where i am.
That is y i asked about driving it 500 miles to where i grew up and work on it when ever i can. from my research i can get a engine from between 600 to 800 to

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SuperHerman
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Re: xc90 2.5t with dead #3 cylinder

Post by SuperHerman » Fri Feb 07, 2020 7:23 pm

Makes sense. Based on the other comments and suggestions it should make it. I suppose you could do a couple day test run first.

Engine swap not a bad idea, but removal is easy if one has a lift, not so without one. A head is pretty easy, but it requires more time. You should be able to pull the head in less than a day, and bring it with you to clean and prep plus lap the valves.

Theoretically you can pull the head, and if it is flat, just sand it correctly and skip the machine shop. Here I can get the head planed for $100 and that includes a cleaning - which is totally worth it. But, I have done heads, without warp issues, with a wet sand - not to get it flat, but to clean it up.

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Re: xc90 2.5t with dead #3 cylinder

Post by hoboken » Mon Feb 10, 2020 9:14 am

i am more concerned about the seat of the valve machining since valve it is chipped /cracked then worped

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SuperHerman
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Re: xc90 2.5t with dead #3 cylinder

Post by SuperHerman » Mon Feb 10, 2020 4:25 pm

A legitimate concern, unfortunately pulling the head is the only way to know. Prudence would say call around some machine shops and get a quote for replacing the valve seat then make the decision of new engine or head work.

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