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The v70 is going in tomorrow for a misfire.
I've just insured her, checked fluids etc and fired her up.
It's a 2.5 10v. 179k miles.
The Pcv was done less than 20k miles ago but I noticed the dipstick smoking today.
Popped a glove over the dipstick tube and it inflated.
Could this be serious? Engine wear?
I may get a compression test done before any works start.
Anyone had experience with this?
Thanks
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I’d start with a compression test, but it could be something as simple as a breather fault.
Does it use oil, or suffer from a lack of power/smoke excessively under load?
Edit - of course it suffers from lack of power , it’s got s misfire Doh!
Note to self- read post properly 🙄
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Hopefully. I'm using a new mechanic for the first time tomorrow so we'll see.
Doesn't use oil at all, the service history is incredible so I'm hoping its not worn internally.
No smoke etc from exhaust
😂 yep defo lack of power haha! Plugs were filthy black upon inspection so hopefully the misfire is due to running rich, 02 sensor or vac leak.
I think the smoking dipstick isn't related to the misfire, just crossing my fingers and toes that a) it isn't knackered and b) the new mechanic knows his stuff.
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Good news! Compression test passed  Cracked rotor arm replaced, still tracking down misfire |
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ChasR
RR Helper
motivation
Posts: 10,189
Club RR Member Number: 170
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Blow by/ Engine wear? VolvoChasR
@chasr
Club Retro Rides Member 170
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When is the misfire present? Is it all of the time or does it come and go? If intermittent, when does it come and go?
By the sounds of it, this uses a distributor based EFI setup to fire the plugs?
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Last Edit: May 5, 2020 16:11:31 GMT by ChasR
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stealthstylz
Club Retro Rides Member
Posts: 14,829
Club RR Member Number: 174
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Blow by/ Engine wear? Volvostealthstylz
@stealthstylz
Club Retro Rides Member 174
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Compression tests aren't the best way to check for bad rings or damaged pistons the oil getting past can cause a good enough seal to make the readings good.
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Compression tests aren't the best way to check for bad rings or damaged pistons the oil getting past can cause a good enough seal to make the readings good. What way would you use to check for bad rings/bores? Not being smart, I’d be interested to know, especially as what you said makes sense when we put oil into a cylinder to see if the compression improves? Cylinder leakage test? |
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stealthstylz
Club Retro Rides Member
Posts: 14,829
Club RR Member Number: 174
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Blow by/ Engine wear? Volvostealthstylz
@stealthstylz
Club Retro Rides Member 174
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I usually do a combination of leakdown test/check spark plugs/have a sniff down the sparkplug hole on petrols and just the leakdown test on diesels. The smell thing is probably difficult unless you've stripped a lot of engines though. I can tell what's going to be wrong by the smell of it when I take the rocker cover off lol.
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Update...
Cracked rotor arm and a hairline fracture on one of the plugs. Replaced, still the same.
Swapped a couple of injectors over as couldn't hear 1 working. Now runs fine! Reset eml by disconnecting battery all sorted.
However, the dipstick is still smoking and venting positive pressure. Obvs not connected to the misfire. The pcv etc was all done late last year so shouldn't be blocked again should it?...
Hope I'm not looking at a rebuild..
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Worth checking the whole of the breather system including PCV. Not sure how complex the system is on the Volvo but there’s often plenty of scope for blocked/collapsed hoses and sometimes there are gauze flame traps at the point(s) of exit from the engine which get clagged up.
Nick
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1967 Triumph Vitesse convertible (old friend)
1996 Audi A6 2.5 TDI Avant (still durability testing)
1972 GT6 Mk3 (Restored after loong rest & getting the hang of being a car again)
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ChasR
RR Helper
motivation
Posts: 10,189
Club RR Member Number: 170
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Blow by/ Engine wear? VolvoChasR
@chasr
Club Retro Rides Member 170
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Like Nick said, I've had breather hoses block up, especially with the car used on short journeys.
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The pcv etc was all done late last year so shouldn't be blocked again should it?... Was it a brand new PCV unit or used one? You can tell a faulty Volvo PCV unit a mile off. There will be distinctive echoing, rattling,tapping, man with maracas noise under your bonnet which often can be heard at the intake/airbox. If that's the case, undo oil cap and noise will stop/lessen. That's a faulty PCV. If not, yes it's a good call to check out for restrictions in the PCV pipe lines. Perhaps increase the diameter of the PCV pipes like this guy did here
As for an engine rebuild, if it's your daily , it's got reasonable miles on it so there's going to be a bit of breathing - add a catch can and pour the contents back in every now and then. |
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Cracked rotor arm replaced, still tracking down misfire
