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Post by studabear on Jul 28, 2018 23:32:35 GMT 1
You certainly know your stuff, your explanations are superb.
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Post by develin on Jul 28, 2018 23:37:41 GMT 1
It means a partial failure of the EGR valve could go undetected by the previous owner for some time..... Undetected? You mean like 90% of issues with a car!? The amount of times I've looked at a car and been told "mechanically it's sound" only to find a list as long as my arm when inspecting... some people are having a laugh but most really do think there's nothing wrong as long as it starts and moves. Personally I like my cars to work properly! My personal favourite is "but it passed it's MOT?"
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Post by valhalla on Jul 28, 2018 23:43:50 GMT 1
It means a partial failure of the EGR valve could go undetected by the previous owner for some time..... Undetected? You mean like 90% of issues with a car!? The amount of times I've looked at a car and been told "mechanically it's sound" only to find a list as long as my arm when inspecting... some people are having a laugh but most really do think there's nothing wrong as long as it starts and moves. Personally I like my cars to work properly! My personal favourite is "but it passed it's MOT?"
I think that could be the case with this car - it isn't unfeasible that a sympathetic free-accel tester could let this one through if he/she happened to avoid letting the engine speed sail into the governed speed of circa 4700rpm.
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Post by valhalla on Jul 28, 2018 23:50:24 GMT 1
I forgot also to mention that the more I drive this car, the worse the rattles become! I cannot stand squeaks and rattles, but one step at a time; MoT first, then refinements like getting the upper dash off the car to screw things together again. I did a bit of research on the V70, and was surprised to find that this Phase_1 model has a pretty bad reputation for squeaks and rattles in older age. Damn. Maybe I was just lucky with the other car!
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Post by develin on Jul 29, 2018 8:25:46 GMT 1
Don't usually associate rattles with tanks (volvos)
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Post by valhalla on Aug 1, 2018 23:18:29 GMT 1
Well, she rattle and squeaked her way over to the MoT this morning, and came away with a pass, despite me taking notice of Mrs. Valhalla for once in my life - and NOT fiddling with the EGR before the test. She knows me better than most, and my ability to clutch defeat from the jaws of victory. So she suggested just seeing how things went, then doing a proper diagnosis on it (loaded hint there from Mrs. Valhalla - "Preach what you want, but take some notice of it every once in a while" - Guilty as charged, M'Lud.....)
The smoke is actually there slightly below 3000rpm on the full-load curve, but it could still be the EGR valve. I have 12months to diagnose it now..... FAS figure came out as 0.41/m, so not a major problem here.
One advisory to look at; a slight play in R/H track-rod end balljoint, which had clearly passed me by, not least a bit embarrassing as that is the wheel that has been off the most for the engine work. It might manifest itself the worst when the wheel is at its normal position in the wheelarch; I have only had this car on the 2-poster so far, so the suspension has been unloaded and dangling up to now.
Anyway, I think a wee dram is in order for tonight, considering this car was written-off by the previous owner and his garage as "dead" at the start of May.
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Post by rhyds on Aug 2, 2018 7:00:11 GMT 1
Top work chief!
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Post by valhalla on Aug 30, 2018 0:51:12 GMT 1
I haven't had much time on the V70 these last two weeks, as I have been flat-out on other jobs around the place, but I did manage to get a couple of items done;
1) The steering tie-rod balljoint was worn, but manifested itself better with the wheel at the normal height in the arch. With the wheel dangling, you could find this if you were looking directly for it, but not if you happened to casually just shake the road wheel to work the steering rack. I had to order something else from Autosessive, so I added a Delphi tie-rod end for the V70 onto the order, and that got fitted last week. Tracking everything back to optimal afterwards was fairly easy on the floor, and the car seems to have improved a lot for precision on faster cornering, even though the wear was minimal beforehand and the nominal tracking figure was spot-on.
2) I also fabricated an EGR blanking plate for my diagnosis of the black smoke, and have proven that the problem is not EGR related at all. That's a shame, as I had pinned this being a quick-fix, so the next stage is to measure the ECU parameters whilst it is happening, and see where I stand. Anecdotal evidence from other V70 TDI owners of the past would suggest that this is not uncommon, meaning that the problem could well be down to a shoddy calibration from the factory. There's a bit I can do to help the mapping if that is the case, but I don't want to strangle the engine for the sake of a localised full-load smoke issue. The car is otherwise spotlessly-clean whilst driving away from full-load, pointing to a mapping problem for smoke-limitation, or possibly a stuck MAF meter potentiometer.
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Post by develin on Nov 2, 2018 14:44:37 GMT 1
You do mapping also?
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Post by valhalla on Nov 2, 2018 22:35:45 GMT 1
No, I stay away from that sort of thing. I cannot justify the kit and the time to do this sort of thing properly - and I know how fragile some of the reflashing prochedures can be, so the last thing I need is to take a healthy car into the workshop in the morning, then ship it out to a dealer (135miles away, at least) on a truck in the evening!!
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Post by develin on Nov 25, 2018 19:38:24 GMT 1
Done and dusted?
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Post by valhalla on Nov 25, 2018 23:54:04 GMT 1
Not quite. I have been out of action for 8weeks, so haven't had much of a chance to play with this car since then. However, I have it back into the workshop today for a coolant problem; as usual for one of these, it has a weep from the heater matrix, which is still the original (not bad for 171k).
Fortunately, Volvo have made this job such a doddle, it is so easy to inspect and diagnose the precise problem (usual seepage from the tubes to plastic end-tanks) and swap it all out.
Unfortunately, the better-quality aftermarket matrices do not always have the screw hole, to secure the coolant pipe manifold to the lower tank, properly formed, so one has to remove said matrix and clear the hole with a twist-drill on the bench......
I'm leaving the half-completed repair overnight with the heater still exposed, as I want to be certain that all the weeps are accounted-for before putting the trim and carpets back in. The reason for that is that the V70 lower dash panels are a fiddle to get the clips correct, and the panel locked back, when you replace them. So I don't want to have to do that bit of the job twice.
I'm still itching to get the interface tool onto the car and take some readings out on the road, as I do still need to get the smoke issue under control. It might just be that the problem is improved slightly in this present air temperature that we have at the moment (4celcius) as the EGR ought to be fully off out on the road in that sort of low ambient temperature.
The car is going to have to earn its living for a wee while now, as I have two of my everyday smokers (actual both quite clean) now out of MoT; one of the problems of being a bit ill to keep on top of MoT's at just the wrong time of the year. So it happens that only the Volvos are still legal, one V70 2.5 10v petrol, and this TDI. It would be just my luck if the cold weather turns to snow....
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Post by Deleted on Nov 26, 2018 0:22:49 GMT 1
I remember someone on here describing a Mitsubishi diesel where the pistons would hit the valves but that a rocker arm would take the brunt of the impact and the engine could be saved? Are you "Young enough" to remember the Bedford Midi vans the rockers were made of alloy and when the cam belt failed the pistons and valves used to contact but the alloy rockers broke to save the engine from a rebuild.
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Post by develin on Nov 26, 2018 0:32:49 GMT 1
Used to have a midi... blue it was... brilliant fold down bed/seat thing in the back such a good family car
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Post by develin on Nov 26, 2018 0:42:43 GMT 1
Not quite. I have been out of action for 8weeks Stay strong fella
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