I'm definitely leaning toward using Time-Serts. I think the hole that has to be drilled for one is slightly larger than for the same size Helicoil, so whatever's happened with the Helicoil installation shouldn't effect the outcome of a Time-Sert installation. Something I hadn't thought to check on.....

Can you access the hole by removing the fender well or cutting a hole in the fender well? I think you have identified the problem. It is likely drilled crooked because of poor access. IF you can get the hole straight, then you can add a larger bolt by tapping the larger hole - no Helicoil needed. v...

I forgot to mention of other option being considered -
5) Install a hydraulic tensioner

Here's the situation I'm trying to resolve. I overtightened the tensioner bolt and about 2 weeks later the tensioner loosened, the belt slipped and the intake valves bent. Right now, the valves are replaced, the engine is back together and it's almost time to turn the key and let it run. The remaini...

Can you add a picture of your under hood sticker for reference and also add your build date? I have exactly the same car , by the way, and some different hose routings A picture of the vacuum routing sticker from under the hood is attached below The build date is 10/98 according to the sticker on t...

For further clarity, here are the part numbers for the some of the relevant components - Purge Valve - Pierburg PA6-GF30 Intake Manifold - 9434314 Fresh Air Hose - 9155453 Air Cleaner - 9125215 Air Cleaner Valve - PP-GF-30 (This doesn't seem to be the part number, but it was the only one visible) Oi...

First, this thread - https://www.matthewsvolvosite.com/forums/viewtopic.php?f=1&t=65002 ( 850 AND S/V/C70 NON-TURBO VACUUM LINES) covers quite a lot, but there are differences between what's shown there and what is on my '99 S70 that just add to the overall murky confusion surrounding the layout...