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Help getting 1997 850R back road worthy

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

Empigt
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Empigt

Help getting 1997 850R back road worthy

Post by Empigt » Thu Dec 05, 2019 7:27 pm

Thanks for any help. I just bought a 1997 white 850 R wagon. It has been treated horribly. Very low miles. 74,000. I bought It in none running condition. It hasn't ran In 7 years( just guessing) In the 3 weeks since I got it, I found the no spark issue to be fuel injection relay hooked up wrong. So it got fire and tried to run. It blew acorn shells 10 feet out the exhaust. It wouldn't hold an idle but revved up sounded great. Lots of smoke at start up and running super rich. So replaced dry rotted vacuum lines. That hasn't helped. In going thru the plug wires and #2 and #3 the motor idle had no change. But good spark for each. Tested the injector wires and both working as they should with solid power and ground pulse. Then #5 injector had good power but a solid none pulsing ground. So I bought another used 850R ecm. Put it in and that corrected the solid ground to #5 injector but made it harder to start when cold. So I just ordered 5 reman White injectors. I also did the pcv system replacement with original volvo replacements not aftermarket as reading on here it sounds like they are junk. So even after doing that and cleaning all ports in the block and ptc (I think that's correct) the ports at the other end by the turbo. Even after doing that it still puffs smoke out the dipstick. But doesn't blow up a glove at the oil fill cap. But doesn't suck it in either. So in the last couple weeks it has come a long way but not there yet. I really want to drive it. Any advice on what else to look for?

polskamafia mjl
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polskamafia mjl

Re: Help getting 1997 850R back road worthy

Post by polskamafia mjl » Thu Dec 05, 2019 9:14 pm

If it's running but puffing smoke with a new PCV I would look into doing a compression test since you might be getting a lot of blow by. The rings could be stuck or they might be excessively worn.
'All my money is gone and I have an old Volvo.' - Bamse's Turbo Underpants

Current: 1995 Volvo 850 T-5R Manual - Bringing it back from the brink of death
Previous: 1996 Volvo 850 GLT - Totaled

Empigt
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Empigt

Re: Help getting 1997 850R back road worthy

Post by Empigt » Fri Dec 06, 2019 9:14 am

I will do a compression test this weekend. Thanks for the tip. With this low of miles I hope the rings aren't shot. It sounds awesome at high rpms.

Empigt
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Re: Help getting 1997 850R back road worthy

Post by Empigt » Fri Dec 06, 2019 9:56 am

Here's a pic of the project.
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foggydogg
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Re: Help getting 1997 850R back road worthy

Post by foggydogg » Fri Dec 06, 2019 10:48 am

+1 on the compression test, and if you get a low number in a hole or 2, a LITTLE Marvel Mystery Oil left to soak for a day or 2 might free up a stuck ring deal. Once you get it mostly running think about the timing belt stuff, not just on the miles but the calendar. I'm trying to resurrect a '98 at the moment, pretty similar story.
I like the stitchwork on the chin spoiler.
Good luck, keep plucking away.
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98 V70GLT x2, parts cars
00 V70xc x2
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Re: Help getting 1997 850R back road worthy

Post by scot850 » Fri Dec 06, 2019 11:10 am

The other suspect due to age of car is valve stem seals.

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Empigt
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Re: Help getting 1997 850R back road worthy

Post by Empigt » Fri Dec 06, 2019 11:30 am

I was thinking valve stem seals as well. I'll do a compression check and injectors this weekend. If injectors help it idle, I'll drive it and see if blowing some carbon and cobwebs out of it helps it out. If compression checks out. And driving it doesnt help it's issues I'm guessing valve stem seals or maybe turbo seals. I'm hoping it clears up with some driving. The kid I got it from did the stitching to the cracks on the bumper. It does give it some attitude.. He had it for over a year and never got it to run. He replaced the cam position, crank position sensors, coil, plugs and plug wires and high pressure fuel line. And never got it to start. It had a number of wires chewed through by rodents under the hood as well.

Empigt
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Re: Help getting 1997 850R back road worthy

Post by Empigt » Fri Dec 06, 2019 12:12 pm

Forgot to say the other things I put on last week. Both o2 sensors, throttle position sensor, since it had the code thrown for it. Coolant temp sensor, the knock sensors(one lead was chewed thru). Timing belt was replaced by volvo at 67,900 miles. By the sticker on the rad. support. It still looks fairly new. I checked the timing to see if that's why it wasn't getting spark. All looked good there.

brunocerous
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Re: Help getting 1997 850R back road worthy

Post by brunocerous » Fri Dec 06, 2019 12:31 pm

What a great project! Can’t wait to see how it goes. Congrats.
2004 XC90 AWD
2000 V70, base, MT, 'The Silver Bullet'
1998 V70, base, AT, 'Blue Steel'
1998 V70 T5, AT, project
1999 V70 XC AWD, AT (RIP)
1998 S70 T5, AT (RIP)

Empigt
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Empigt

Re: Help getting 1997 850R back road worthy

Post by Empigt » Fri Dec 06, 2019 1:05 pm

Thanks. This is my first volvo experience. Been into vw's all my life. Mainly aircooled but a few watercooled ones. My wife wanted a new wagon. After researching The 850R wagon is what I wanted to get her.. She likes this one a lot if we can get it good a dependable. So far only $2000 into it with all the new volvo replacement parts. That's way better than spending $30,000 for a newer mini countryman she did want.

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