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by songzunhuang
29 Jan 2023, 11:33
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Re: Emission system won't reset 98 V70 X/C AWD

Chai, can you post the code you are getting? I know you said it wouldn’t reset, that implies there are codes that are still there. Emissions evap systems leak is usually a P0455. I am in the Santa Cruz area and have a 98 V70 with close to 280k miles. I’ve been doing most of the maintenance myself bu...
by songzunhuang
25 May 2023, 12:16
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Boroscope Pictures of Cylinder 1 and valve

So I realized that I have a boroscope I hardly use. Could my no compression issue be due to a bad piston? Well, we will know for sure when we remove the head, but until then I can check it out with this nifty tool. Here's what I saw. Ignore the date stamp, it's not set correctly. This was 2 days ago...
by songzunhuang
12 Jun 2023, 19:57
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Re: No compression on 1 - burnt valve?

Lots of work. I would also check the injectors, we don't know if they are the reason for it, but it won't hurt and is sensible imo. Maybe someone offers cleaning, or you can get refurbished ones... You an also try to clean them by yourself, build something to actuate the injector and spry carb/inta...
by songzunhuang
17 Jun 2023, 12:14
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Re: No compression on 1 - burnt valve?

abscate wrote: 15 Jun 2023, 06:13 Song - get a bag over that turbo intake pipe facing up, begging to gulp down a loose screw, nut, 10mm socket, or squirrel food and wreck your turbo
Luckily I was able to complete the job without incident! Thanks for the tip though.
by songzunhuang
17 Jun 2023, 12:36
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98 V70 T5 Head Rebuild Done!

So I finally completed the job and fired up the car! It's running good as new, but it wasn't without a few incidents. It took me a lot longer than anticipated because I did a lot of things on top of the rebuild. Here's a picture just before putting the cam cover back on. The gasket material is appli...
by songzunhuang
20 Jun 2023, 10:50
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Re: No compression on 1 - burnt valve?

I went through the same thing, but with far more hiccups. I have the combined Catalytic convert/Exhaust Manifold, it's a chonky piece and couldn't fit behind the now installed head. Obviously I should've have put it in BEFORE the cylinder head. I then had to remove the driveshaft to get it from dow...
by songzunhuang
25 Jun 2023, 22:34
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Awesome Tech Tips Document

I came across this official looking document that has some great information about my ECC unit and other things about our cars as well. https://automotivetechinfo.com/wp-content/uploads/2018/10/Volvo-TechTips-Summer-2018.pdf It confirms that I only have 4 dampers. It also states a procedure to auto ...
by songzunhuang
09 Aug 2023, 17:31
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Re: 2004 XC90 T6 Broken Thermostat Nipple Upgrade

Are there good part numbers to which to index this thread?? I recently came across a Professional Parts Sweden Thermostat Housing which fixes the plastic breather breakage problem! I ordered mine from PartsGeek for about $82. 2004 Volvo XC90 Thermostat Assembly Brand Professional Parts Sweden SKU W...
by songzunhuang
27 Dec 2024, 12:08
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Coolant leak was just a loose clamp

I was re-reading this thread and realized I never closed the loop on the coolant issue. I’m happy to report that my coolant leak was just a loose clamp. It’s been well over a year. I am back in Tahoe again with the family in the red brick. The car now has over 282,000 miles and running like a champ....
by songzunhuang
28 Jul 2025, 09:38
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Re: No compression on 1 - burnt valve?

The Red Brick has 285,335 miles on it now. The P0455 was a bad purge valve. It was annoying that I took the car for diagnostics and they proclaimed my purge valve good. Sure it was “clicking” when energized, but it wasn’t sealing. I took it off to bench test and realized what was going on immediatel...