 |
 | Home | Contact Us | FAQ | Search & Site Map | Link to Us |
 | Sign In | Join | Other 45 Sites in Network |
Car Forum / Volvo Cars / January 2007oil-change cause rough idle?
per our '97 volvo 960 wagon, we had the oil changed at a drop-in mechanic/tire shop chain a few weeks ago and, about three days later, the engine started idling rough. a mechanic friend of the original owner (he's out of state) familiar with volvos said that non-volvo guys who change the oil can and do disconnect or otherwise goof-up connections such as vacuum hoses or tubing that could cause a rough idle. a non-volvo local mechanic says he can't imagine how an oil change procedure could produce a rough idle. before we start shoveling money at the problem, would appreciate some learned chat on the appearance of a sudden rough idle on an engine that was running flawlessly prior to the oil change. many thanks. art Unscrew (torx bolts) the plastic cover for the spark plugs, and check for oil spilled when the engine was re-filled. Spilled oil can seep under the plastic cover and collect around the spark plug leads/coil packs/plugs. Also check for loose/unseated cables which may have been moved when cleaning up such a spill. (Don't mix up any cables if removing them to clean/re-seat). I've had uneven running occur just as you describe, a couple of times in the last 2 years on my 960, shortly after an oil change or inadvertent spill during topup. After careful cleaning with a paper tissue and re-seating any loose electrical connectors, the car returns to normal, very smooth, running (now at 125k miles). Your source on vacuum tubes is also correct though, they're just harder to check - there's a junction box of vacuum tube pipes somewhere (lower-right engine compartment? it's too dark to check here just now), one tube could be broken/perished after movement during general wiping up of oil spills etc. I'm told faulty vacuum pipes are harder to detect and replace. Good luck. 960s are still great cars when they work, just a few more things to go wrong than on the 4/5 cylinder models. But much better than the '98 V70 I used to run... > per our '97 volvo 960 wagon, we had the oil changed at a drop-in > mechanic/tire shop chain a few weeks ago and, about three days later, the [quoted text clipped - 6 lines] > learned chat on the appearance of a sudden rough idle on an engine that was > running flawlessly prior to the oil change. many thanks. art ascott: many thanks your good suggestion. a non-volvo mechanic (nephew of a close friend) said he'd give it a quick look-see tomorrow and i'll give him your note. if he can't find the problem, we'll have to move it along to a guy named olaf with an obdii scope. fyi, i took it out on the freeway today and then around the town and you'd never know there's a problem except at idle. smooth as an icy blast of absolut. am > Unscrew (torx bolts) the plastic cover for the spark plugs, and check > for oil spilled when the engine was re-filled. Spilled oil can seep [quoted text clipped - 34 lines] >> was >> running flawlessly prior to the oil change. many thanks. art > ascott: many thanks your good suggestion. a non-volvo mechanic (nephew > of a close friend) said he'd give it a quick look-see tomorrow and i'll > give him your note. if he can't find the problem, we'll have to move it > along to a guy named olaf with an obdii scope. fyi, i took it out on the > freeway today and then around the town and you'd never know there's a > problem except at idle. smooth as an icy blast of absolut. am The problem only at idle really increases the "vacuum hose" suspicion. Mike > per our '97 volvo 960 wagon, we had the oil changed at a drop-in > mechanic/tire shop chain a few weeks ago and, about three days later, the [quoted text clipped - 6 lines] > learned chat on the appearance of a sudden rough idle on an engine that was > running flawlessly prior to the oil change. many thanks. art They may have knocked loose a vacuum line, it's not a Volvo specific problem but if there's lines in the vicinity of the oil filter that's where I'd start, just a good look under the hood with a flashlight should determine the state of those. the mechanic is reporting an unhappy coil. not sure how that could affect only one cylinder instead of all six. we'll see. thanks all for your observations. art > per our '97 volvo 960 wagon, we had the oil changed at a drop-in > mechanic/tire shop chain a few weeks ago and, about three days later, the [quoted text clipped - 6 lines] > some learned chat on the appearance of a sudden rough idle on an engine > that was running flawlessly prior to the oil change. many thanks. art > the mechanic is reporting an unhappy coil. not sure how that could > affect only one cylinder instead of all six. we'll see. thanks all for > your observations. art I don't know when they started doing it but my S80 has an individual coil for each cylinder (connects directly to the sparkplug, no high tension wire) Allen folks: again, many thanks for your input on this query. it turned out to be a bad coil. all best, art p.s. i am unable to determine the root of the coil problem, whether nature or nurture. > per our '97 volvo 960 wagon, we had the oil changed at a drop-in > mechanic/tire shop chain a few weeks ago and, about three days later, the [quoted text clipped - 6 lines] > some learned chat on the appearance of a sudden rough idle on an engine > that was running flawlessly prior to the oil change. many thanks. art |
Reply to this Message |
 Sign In
 Join
 My Latest Posts My Monitored Threads My Blog My Photo Gallery My Profile My Homepage Start New Thread Enable EMail Alerts Rate this Thread
|
©2008 Advenet LLC Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.