tonybaroni
Member
- Joined
- Oct 30, 2017
- Location
- San Francisco Bay Area
I've got a few problems with my b20, and I'm working on diagnostics to determine what's likely the cause, before tearing it apart. I need to keep it running for a bit before I can tear into it, as I am brining my regular vehicle in for some possible extended maintenance soon.
I've seen lots of pics of spark plug diag's...but it's hard to find high res ones. I thought perhaps someone here could point me to a better source for that info.
Couple steps taken/info gathered:
Low compression on rearmost cylinder dry, ok wet. Likely worn rings, or perhaps broken.
Metal shavings present under valve covers, in pooling areas of oil
low vacuum at idle
Low power - doesn't want to rev past 4000 or so
Stumbles upon accellerator press (likely bad throttle switch, but unplugging it makes it much worse, so I think it's helping a little, just not at the very bottom of the pedal travel).
Prev. owner, two mechanics stated cylinder 3 cam lobes worn out (I'm not sure which is #3...does it start with 1 in the front?)
Odd noise
Plug pics...not sure how to read these. And I'm not sure how to add them. My posting rules say I cannot post attachments. Any ideas on how to fix that?
Here's a link to a shared google album w/ the pics, and the notes on testing.
https://photos.app.goo.gl/3ah454CDGfHOI5KG3
The dirtiest one, looks like oil fouling...since it's got good compression, I'm guessing leaking valve seals....
The other ones...perhaps the plug temps are off? The white deposits, apparently flaking off, don't appear normal to me.
I've seen lots of pics of spark plug diag's...but it's hard to find high res ones. I thought perhaps someone here could point me to a better source for that info.
Couple steps taken/info gathered:
Low compression on rearmost cylinder dry, ok wet. Likely worn rings, or perhaps broken.
Metal shavings present under valve covers, in pooling areas of oil
low vacuum at idle
Low power - doesn't want to rev past 4000 or so
Stumbles upon accellerator press (likely bad throttle switch, but unplugging it makes it much worse, so I think it's helping a little, just not at the very bottom of the pedal travel).
Prev. owner, two mechanics stated cylinder 3 cam lobes worn out (I'm not sure which is #3...does it start with 1 in the front?)
Odd noise
Plug pics...not sure how to read these. And I'm not sure how to add them. My posting rules say I cannot post attachments. Any ideas on how to fix that?
Here's a link to a shared google album w/ the pics, and the notes on testing.
https://photos.app.goo.gl/3ah454CDGfHOI5KG3
The dirtiest one, looks like oil fouling...since it's got good compression, I'm guessing leaking valve seals....
The other ones...perhaps the plug temps are off? The white deposits, apparently flaking off, don't appear normal to me.