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Car Forum / Volvo Cars / June 2004'95 850 Turbo Surge
Our '95 has developed a surge under acceleration especially from a standing start, and actually you can tell it is there about any time you accelerate fairly hard. Probably goin to run this thing in to the Volvo folk, but would like some idea what might be goin on here from anyone that has experienced this action?? Worry is that so many "repair" outfits have become simple parts changers until they hit on the right one. TIA Jim > Our '95 has developed a surge under acceleration especially from > a standing start, and actually you can tell it is there about any time [quoted text clipped - 6 lines] > > TIA What kind of "surge"? My 97 850GLT choked and stumbled when passing for a while. I believe the check-engine light had come on also. Replacing an oxygen sensor (front, as I recall) cured it. > > Our '95 has developed a surge under acceleration especially from > > a standing start, and actually you can tell it is there about any time [quoted text clipped - 10 lines] > passing for a while. I believe the check-engine light had come on > also. Replacing an oxygen sensor (front, as I recall) cured it. Almost like you are slowly in and out of the throttle. Don't think it is an 02 sensor, gas mileage hasn't changed and the Volvo "specialist" I just had look at it couldn't get any codes to spit out? Strange that at WOT the thing runs fine, just kinda hard to be doing 140 or 150mph around town. Had a similar problem with a Ford Probe but their diagnostic at least spit out a couple codes and indicated a problem with one of three items. I picked the least expensive and it turned out to be the right one - MAF sensor (mass air flow). Guess I'm forced back to the dealer outfit - at least he might have a few parts to try out?? Jim - Old enough to miss the days when a car ran on gas, fire, and air and chances were good that when the thing wasn't running right it was only one or more of those three characters at fault;) > > "JIM" <Firewagon1@prodigy.net> wrote in message > news:haVuc.5057$Ak6.4021@newssvr32.news.prodigy.com... [quoted text clipped - 17 lines] > look at it couldn't get any codes to spit out? Strange that at WOT the thing > runs fine, just kinda hard to be doing 140 or 150mph around town. You have a different problem. Mine choked worst at wide open throttle. > > "JIM" <Firewagon1@prodigy.net> wrote in message > news:haVuc.5057$Ak6.4021@newssvr32.news.prodigy.com... [quoted text clipped - 23 lines] > air flow). Guess I'm forced back to the dealer outfit - at least he might > have a few parts to try out?? Have anoither look at the o2 sensor switching rate.- yes with a multimeter the old fashioned way. Surge is usually due to a slow / lazy sensor- this will only be apprent at light to medium throttle when the ecu is running in closed loop. What happens is the mixture tends to swing too lean and you loose power (but you wont notice this cos you are applying more throttle than you would do if it were working fine) then when the sensor reacts and the ecu applies more fuel you get more power which you notice as a surge. I am surprised that your not getting any long term fuel trim out of tolerance error codes though- its possible that the sensor isnt quite bad enough to cause this tho. Tim.. > Have anoither look at the o2 sensor switching rate.- yes with a multimeter > the old fashioned way. You're kidding, right? Most "repair specialists" have become nothing more than parts changers and probably have a hard time spelling multimeter much less know how to use it..... > I am surprised that your not getting any long term fuel trim out of > tolerance error codes though- its possible that the sensor isnt quite bad > enough to cause this tho. Somewhat my thinking also. Maybe somebody at Volvo still has the capability of doing the process of elimination without doing an engine rebuild?? Thanks for the suggestion, will pass it on. Jim |
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