2001 V70 2.4T inconsistent startup issues

[jonesg]

THe video , that deep popping sound, my guess is oil pan combustion.

Along with smoke from dipstick etc.
My concern would be for the rear main oil seal getting blown out.
I'd drive with the dipstick loose to relieve pressure in the pan til you get to that PCV cleanup.

[prwood]

THe video , that deep popping sound, my guess is oil pan combustion.

Along with smoke from dipstick etc.
My concern would be for the rear main oil seal getting blown out.
I'd drive with the dipstick loose to relieve pressure in the pan til you get to that PCV cleanup.

We've actually been driving with the dipstick removed for a while just for that reason.

[jonesg]

Read this, might be vac issue.

http://www.volvoforums.org.uk/showthread.php?t=269693

[prwood]

If I had routed the serpentine belt incorrectly, could it have caused the types of issues I described in this thread?

[prwood]

Well, I don't know for sure, but I have a feeling that I routed the accessory belt incorrectly when I had taken it off in the process of doing the coolant diagnosis. Then on Saturday I did the timing belt, and had to take off the accessory belt again. Unfortunately at that point I didn't make a record of how the serpentine belt was attached, so I don't know how it *was* routed. When putting it back on, I double checked the routing with a diagram I had used in the past, and while looking at it I had a feeling that I may have previously misread the diagram.

In any case I triple checked this time when putting it back on. Ever since, everything has been working great. No startup issues, surging, or A/C compressor issues whatsoever. My theory is that previous way I had routed this belt allowed the car to work somewhat, but some of the pulleys must have been spinning in the wrong direction and causing some of the components (especially the AC compressor) to freak out. It must have also been causing things to seize up occasionally which is why it would sometimes die immediately at startup. I suspect the computer also detected this and that this is why I was getting the 'engine system service required' message. Unfortunately, even after disconnecting the battery, that message has come back, so I suspect it's a sort of permanent mark that gets logged in the computer if it had detected an issue like this in the past, so that a Volvo repair shop will know that something was screwed up at one point. Hopefully I didn't permanently damage anything when the belt was misrouted, but I've been testing it pretty thoroughly since Saturday (various combinations of AC, no AC, periodic AC changes), and not a single problem.

[volvolugnut]

I realize this is an old and dead topic, but I want to clear up misinformation about the box containing the ECM and TCM. On 2001 V70 T5 models (and perhaps the non turbos also), there is an air duct from the cabin air flow that blows air into the back side of the box. Air exits the front side of the box and another duct extends behind the fan shroud and is open. My assumption is this air flow is to cool the ECM and TCM in hot weather when the cabin is assumed to have air conditioning. If you have the cabin fan on high, you can feel the slight flow at the front of the box.

[abscate]

Well, I don't know for sure, but I have a feeling that I routed the accessory belt incorrectly when I had taken it off in the process of doing the coolant diagnosis. Then on Saturday I did the timing belt, and had to take off the accessory belt again. Unfortunately at that point I didn't make a record of how the serpentine belt was attached, so I don't know how it *was* routed. When putting it back on, I double checked the routing with a diagram I had used in the past, and while looking at it I had a feeling that I may have previously misread the diagram.

In any case I triple checked this time when putting it back on. Ever since, everything has been working great. No startup issues, surging, or A/C compressor issues whatsoever. My theory is that previous way I had routed this belt allowed the car to work somewhat, but some of the pulleys must have been spinning in the wrong direction and causing some of the components (especially the AC compressor) to freak out. It must have also been causing things to seize up occasionally which is why it would sometimes die immediately at startup. I suspect the computer also detected this and that this is why I was getting the 'engine system service required' message. Unfortunately, even after disconnecting the battery, that message has come back, so I suspect it's a sort of permanent mark that gets logged in the computer if it had detected an issue like this in the past, so that a Volvo repair shop will know that something was screwed up at one point. Hopefully I didn't permanently damage anything when the belt was misrouted, but I've been testing it pretty thoroughly since Saturday (various combinations of AC, no AC, periodic AC changes), and not a single problem.

Did this problem ever return?

Starting in 1999, Volvo alternators have one way clutches so they will only output turning in the ccw direction facing the pulley. That will trigger the “engine service required light” too

[darrylrobert]

Wow