Last post on Aug 15, 2012 at 7:24 PM
You are in the Volvo S70
What is this discussion about?
Volvo S70, Sedan
#970 of 1197 Volvo S70 w/bad engine
Jun 26, 2006 (12:38 pm)
I suspect my young adult ruined the engine in this 1998 S70 GT by using poor quality regular gasoline even after several warnings. The sensor was replaced and several mechs looked and said dump the card. Black smoke (no oil leak apparent) continues to invade passenger compartment and environment. It was purchased used and is still bank owned. Is a rebuilt engine recommended?
#971 of 1197 Re: Volvo S70 w/bad engine [yhwh4me]
Jun 26, 2006 (12:46 pm)
I had no problem running regular in my '98 T5, so the GLT certainly should have no problem with it. Just exactly what are we talking about when you say "poor quality"? It would have to be REALLY poor. Like stalling and sputtering poor, in which case, I don't see how the car would be driveable with that gas in it.
Is it a stick or auto? How many miles? Do you have to keep adding oil? (I presume so if its spitting out black smoke, but just looking for confirmation)
You sure he's not racing the thing?
Aside from the smoke, how is it running?
#972 of 1197 Re: Volvo S70 w/bad engine [qbrozen]
Jun 26, 2006 (1:00 pm)
It does stall at times. 120K miles. I recommended a name brand gas like Mobile,Exxon,BP,..not GAS brand. No excessive oil use.
We get persistent coughs after driving and the smoke stains the ground below tailpipe.
#973 of 1197 Re: Volvo S70 w/bad engine [yhwh4me]
Jun 26, 2006 (1:05 pm)
Hmmmm... black smoke without burning oil. Well, that means its not burning the gas properly. Have you done a full tune-up? (wires, plugs, filters, etc)
How about cleaning the crankcase ventilation system (PCV). Its definitely due with this many miles and can cause excess pressure in the crankcase, which can then cause blowby and ultimately result in a blown main engine seal (YIKES!).
After all that, go and pay for a fuel injection system cleaning. Its not something I usually recommend, but it sounds like you may be a good candidate.
If you aren't burning oil, then I don't see how anyone can recommend replacing the engine. That's premature, to say the least.
#974 of 1197 Re: Volvo S70 w/bad engine [qbrozen]
Jun 26, 2006 (6:33 pm)
Hi folks. Since we're on the topic of fuel octane rating, my 1999 S70 (base) owner's manual says it'll run on regular 87 octane, but recommends 91. I've switched between 89 and 91, with no difference in performance or fuel consumption that I could tell. Have never tried 87 octane though. Any thoughts/experiences? Anyone suffered pings/knock with 87? Any long-term harm in using 87 or 89 rather than 91?
#975 of 1197 Re: Volvo S70 w/bad engine [oculus1]
Jun 27, 2006 (6:34 am)
As I said, I ran 87 in my T5 for years with no problems. So your base model should certainly be just fine with it.
Jul 20, 2006 (6:02 am)
hi, new member here, have a 99 s70 with about 118,000 miles. just went in for an oil change at a local volvo servicer and he mentioned getting the timing belt replaced? i know the manual suggests this at 105k, and i cant remember what all i have done to it. it runs great, but wondering how much of an issue this timing belt really is. thanks
#977 of 1197 Re: timing belt [99reds70]
Jul 20, 2006 (12:21 pm)
well, if the belt has not been replaced, then you are on borrowed time.
S70's have zero clearance engine's meaning if the belt goes, so will the valves. Find out if the belt has been done, if not get it done SOON.
#978 of 1197 Re: timing belt [99reds70]
Jul 21, 2006 (7:47 am)
listen to vmax!
heck, i would not even be driving that car right now without knowing if the belt was done. If it goes, you can scrap the whole car because it won't be worth it to fix.
Jul 28, 2006 (5:08 am)
hey, got the timing belt replaced, no problems, but this volvo is expensive. and now the service place mentions a slight high pitched whine when the engine starts and this might be the alternator??? i do hear a higher pitched whirring noise when i first start the car, but then it goes away after just a couple seconds. ever heard of such a thing??