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PCV System Repair on a Volvo 5-cylinder

Let’s talk PCV System Repair

PCV System Cleaning Tutorial w/ Pics

This tutorial will help you clean the PCV system on your 1993-2000 5-cylinder Volvo engine. Keep in mind that this is focused on a later-generation Turbo model (I have a 1998 S70 T5), there will be some differences between each year and depending whether yours is a N/A or earlier model.


If you own a turbo, it is a good idea to clean the PTC nipple periodically every 40-50K miles or so (see below), or get rid of the flame trap if your N/A car still has it installed.

Some introductory notes: Before you even start this job, make sure you’ve got all the tools you’ll need together, especially if it’s your only car.

As promised, PCV System Repair on a Volvo 5-cylinder

Bonus! Volvo Facts

  • Volvo revolutionised safety in cars when engineer Nils Bohlin created the three-point seat belt in 1959. Bohlin’s innovative Y-shaped design protects the chest, pelvis and shoulders upon impact. We waived the patent for the pioneering design so that other car manufacturers could use it too. Volvo’s commitment to safety has saved an estimated one million lives

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I am getting ready to try and do the job myself but have concerns about getting the manifolds bolts loose , did you have any problems getting them off? if so what tricks would you suggest.

1999 v70 t5 I got it a week a go ran great before putting the wife in it. Then it lost all the oil within a couple of miles. The pcv appears to be stop up waiting on the new to come but i have never seen one do that.

A PCV in bad shape is a slow-motion problem, not an immediate problem. But immidiate or not, it’s a costly repair if you let it go… usually a rear main seal blown.

In and of itself, PCV isn’t a problem — it causes other things to break.

Kendash your post sounds a little bit like you’re not sure what’s going on, so maybe read up more on the PCV system, what and why it does what it does. Here’s a group of PCV problems, solutions and opinions that will earn you a Masters in PCV if you read all of them.

Wow, what a huge problem! Got my 98 V70 turbo from my sister (about 190k on the clock) Turbo leaking oil (1 quart per week) out of the seals, not return pipe. Huge oil evaporation smell inside at idle.

Started getting misfire codes. Changed cap and rotor. Old cap was gunked with oil and debris.

Next day, misfire codes and huge smoke! Took to mechanic, cap was full of oil and water. Conclusion, bad PCV.

Cost to replace $600. Included seals for cap and timing belt. BTW, friend had his later V70 PCV replaced at another shop, cost $600.

Looks like, after 2 weeks, oil leak from turbo mostly gone away. Leak caused by back pressure? Maybe.

I believe it’s a good thing to disconnect the connectors or the knock sensors, check them, if needed clean them and lubricate them with a dielectric lubricant.
This is, because they are uncovered during the PCV system replacement.
Often, the knock sensors give a fault code not because they are faulty, but because the connectors are corroded.

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