Most likely the fuel pump. The top cracks and causes what you describe. Some have gotten by with applying a layer of JB Weld over the fuel pump plastic to cover the crack. Others just replace the part. Do a search for replacing the fuel pump and you will find what you need. Then remove the seats and...

Look up timing belt replacement. You will see the offending seal once the harmonic balancer is removed (if I recall correctly you have to pull off the sprocket which is not much added work).

If you think you can manage the timing belt and abscate comes by you are home free.

Could be the brushes on the motor going bad or could be a lack of lubrication. As the assembly is out I would clean up the old gunk, repack with grease and then try power directly to the motor. You will have to take the fan cage off which is not difficult to get to the bearings. A rather primitive a...

Springs break. They are mainly designed to go up and down. As I understand it the metal is manufactured to be happy stressing up and down, but this is at the expense of other directions. A tow truck would be putting pressure on the spring front to back and under weight (up and down) - this is a perf...

Epic efforts and I enjoy reading the updates.

I have found that epoxy putty is great for rebuilding broken plastic posts. If you work it just before it completely cures it can be shaped very accurate.

If your crank as set at the timing mark you should be fine. From what I understand the crank timing mark is 20 degrees BTDC. See here for an explanation as to why: https://www.matthewsvolvosite.com/forums/viewtopic.php?t=72757 What you felt was the valve springs pushing the cam lobes as the cam was ...

Before listening to the video -seeing the mileage I said timing belt. So before going forward - has your timing belt been changed as it is due. You have a potential engine wreck coming if you are on the original 20 year old timing belt. Did you have any symptoms before or is this a sudden event? Any...

June those new updated lights do look much better design wise.

Curious if you got the car operational with or without the defouler plugs.

The test results you show are from what source? What I am most curious about is if you use the defouler plugs - does the car still pass emissions or is it just beating the computer you are using.

Some smaller shops will charge less and use regular oil and possibly a lesser filter. They will rightly recommend a 3k service interval. Some will offer full synthetic and some will use quality filters. (Some will even let you bring the filter and oil - and charge $30 for the service only, but leave...