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Problems after replace pcv 850r

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
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dan8519
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Problems after replace pcv 850r

Post by dan8519 » Tue Jun 30, 2020 11:53 pm

Hi friends from Spain! I have a problem on my 850r. This month i have been changing the pcv system and cleaning maf, idle air control valve and the admision valve with a special product. When i went to start the car the revolutions have risen to 3000 momentarily and then it went down to turn off the car. The sound of the engine was irregular and i smelled gasoline in the exhaust. Any idea what the problem may be? Before changing the pcv it worked well, it only had a broken pcv vacuum near thermostat. Thanks friends

dan8519
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Re: Problems after replace pcv 850r

Post by dan8519 » Tue Jun 30, 2020 11:54 pm

Sorry its a 1997 850r

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erikv11
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erikv11

Re: Problems after replace pcv 850r

Post by erikv11 » Wed Jul 01, 2020 12:01 am

Check if there is a vacuum leak.

Is the intake manifold gasket sealed properly, especially on the front corner near the distributor cap?

You can use starting fluid to help find vacuum leaks.
'95 854 T5-R, Motronic 4.4, 185k
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dan8519
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Re: Problems after replace pcv 850r

Post by dan8519 » Wed Jul 01, 2020 3:12 am

Before change the pcv it hasnt problems with vacuum hoses. I will disassemble and reassemble the intake manifold. Do you recommed to dissamble the intake with the fuel rail or dissamble the fuel rail with the injectors and then the intake manifold?

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abscate

Re: Problems after replace pcv 850r

Post by abscate » Wed Jul 01, 2020 3:54 am

You can leave the injectors on.

Take a careful look around the manifold with a flashlight and see if anything is stuck in the gasket
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Re: Problems after replace pcv 850r

Post by scot850 » Wed Jul 01, 2020 11:42 am

There is a bracket on the cylinder #5 end of the intake that holds the PCV pipes in place. I have managed to get that trapped twice doing the PCV systems between the manifold and the head.

Car may have run fine prior to work done, but moving around old pipes and wiring can cause new issues that were not there before. So carefully check everything you disturbed for air leaks or bad connections.

I wish you good luck!

Neil.
2000 V70 R - still being an endless PITA
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2003 Toyota 4Runner V8 Limited
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1993 850 GLT -Sold
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Re: Problems after replace pcv 850r

Post by rguzz » Wed Jul 01, 2020 2:48 pm

Yes, look for torn intake manifold gasket near # 5 cylinder. Sounds like you have an air leak, a large one. Even more likely as you describe no such issues prior to taking on the PCV. Has to come apart, unfortunately. Take a long look at the intake manifold gasket as has been suggested.

dan8519
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Re: Problems after replace pcv 850r

Post by dan8519 » Thu Jul 02, 2020 1:49 pm

Thanks friends! The problem was in the intake manifold gasket, near #5 cylinder. Now the car running perfect! Next step repair odometer and speedometer

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Re: Problems after replace pcv 850r

Post by scot850 » Thu Jul 02, 2020 1:51 pm

Great news! Glad you found the problem, and can move on to the next one.

Neil.
2000 V70 R - still being an endless PITA
2006 XC70
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - New project and test bed - Sold

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