FAST850R Posted March 18, 2010 Report Share Posted March 18, 2010 I was driving my car on a freeway today. The outside temp was about 63 degree. Car was fully warmed up. I stepped on the gas pedal (sport mode), and rpm didn't pass 3000rpm, I stepped on it further and the pedal actually touched the ground, still rpm at 3000. I let go of the pedal, and stepped on it again, then kick down switch kicked on, rpm went to 4000, 5000, and car accelerated just fine. I was speeding about 60mph when I tried to go faster. What can cause this problem?? My car is 1996 850r with 140k miles. New spark plugs, wires, cap&rotor, new timing belt with everything need to be replaced, new serpentine belt, new engine oil, tranny oil, and new pcv system. I basically finished stage 0 on my car. This is my first volvo and I don't know how responsive and fast it should be. I honestly want to drive other volvo 850r so I can compare it. I always think that my car is not responsive, and I thought it was turbo lag, but the experience that I had today was not turbo lag, and I don't know what it is. Maybe tranny slipping? How can you tell whether the tranny is slipping or not? The RPM goes over 3000 only when kick down switch kicks on. Most of time, it is kind of boring to drive, and I don't know whether it's normal or not. Any advice on the problem? Link to comment Share on other sites More sharing options...
TRACStar Posted March 18, 2010 Report Share Posted March 18, 2010 Sounds broken Any CELS? Link to comment Share on other sites More sharing options...
FAST850R Posted March 18, 2010 Author Report Share Posted March 18, 2010 I have faulty VSS CEL, but it was replaced today, and took my car to a freeway. Can vacuum leak cause this? Link to comment Share on other sites More sharing options...
FAST850R Posted March 18, 2010 Author Report Share Posted March 18, 2010 I've been researching about the problem, and it might be a faulty O2 sensor? Poor acceleration, and bad gas mileage.....looks like what I have now. Link to comment Share on other sites More sharing options...
jablackburn Posted March 18, 2010 Report Share Posted March 18, 2010 Considering your R has 4 more HP than my S70, it should go like hell when you step on it. The RPMs will go well over 3000 during any normal driving, even in E mode. If I punch the gas in S, not even flooring it, it will immediately drop 2 gears without hesitation and the turbo boosts up almost instantly at speeds over 40. The tranny wouldn't be slipping unless you take off from a stop and the RPMs increase instantly while the road speed doesn't much. You can usually feel the transmission jerking, or at least you could in the case of our old Cherokee. It should downshift pretty quickly and get going when you tell it to. I think you've got a problem with a sensor (throttle position sensor maybe?) somewhere, or a vacuum leak. Turbo hoses? Give things like that a good look-over. Link to comment Share on other sites More sharing options...
FAST850R Posted March 18, 2010 Author Report Share Posted March 18, 2010 Considering your R has 4 more HP than my S70, it should go like hell when you step on it. The RPMs will go well over 3000 during any normal driving, even in E mode. If I punch the gas in S, not even flooring it, it will immediately drop 2 gears without hesitation and the turbo boosts up almost instantly at speeds over 40. The tranny wouldn't be slipping unless you take off from a stop and the RPMs increase instantly while the road speed doesn't much. You can usually feel the transmission jerking, or at least you could in the case of our old Cherokee. It should downshift pretty quickly and get going when you tell it to. I think you've got a problem with a sensor (throttle position sensor maybe?) somewhere, or a vacuum leak. Turbo hoses? Give things like that a good look-over. Thank you for the reply. Yeah I guess my car has a problem. I honestly think my R is kind of boring to drive right now. Throttle response is terrible. I will check TB sensor, vacuum hoses, and turbo hoses, but can anyone tell me where is TB sensor? If TB sensor is bad, don't I get a code? Which vacuum hoses should I check? Is there any hose that known to be failed? Link to comment Share on other sites More sharing options...
Pops Racer Posted March 18, 2010 Report Share Posted March 18, 2010 clean your MAF? Link to comment Share on other sites More sharing options...
jablackburn Posted March 18, 2010 Report Share Posted March 18, 2010 It's right at the front (facing radiator) side of the throttle body. Look down and you will see it. Vacuum hoses: Check the 3 going into the turbo (red, yellow, blue). Those ones are hugely susceptible to the heat over the years and commonly fall apart altogether. Check the ones at the intake manifold, PTC, and left side of the intake manifold as well. Cleaning the MAF is worth a shot as well. Pick up a can of electrical cleaner at the store and just spray the inside and let it dry. Link to comment Share on other sites More sharing options...
FAST850R Posted March 19, 2010 Author Report Share Posted March 19, 2010 It's right at the front (facing radiator) side of the throttle body. Look down and you will see it. Vacuum hoses: Check the 3 going into the turbo (red, yellow, blue). Those ones are hugely susceptible to the heat over the years and commonly fall apart altogether. Check the ones at the intake manifold, PTC, and left side of the intake manifold as well. Cleaning the MAF is worth a shot as well. Pick up a can of electrical cleaner at the store and just spray the inside and let it dry. Thank youso much for the diagram! I will check all the hosese tomorrow. I will take pictures and post them here so you guys can see what condition they are. I hope it's just vacuum leak. Link to comment Share on other sites More sharing options...
FAST850R Posted March 19, 2010 Author Report Share Posted March 19, 2010 I checked all the vacuum hoses, and they looked fine. I sprayed carb cleaner around intake manifold, but no leak there. Idling very smooth, and movement at all. however, I think I am hearing vacuum leak sound, but I am not sure. I posted video here so please check the video and let me know if the motor sounds healthy. I am going to buy electric cleaner right now and clean the MAF. Link to comment Share on other sites More sharing options...
Guest 855T_Jack Posted March 19, 2010 Report Share Posted March 19, 2010 Sounds relatively normal, except when very close to the spark plug cover. Did anybody else notice that? It almost sounded like a rod knock. Anyways, what are you boosting? It sounds like my car did before I replaced my intercooler. The milage was terrible, and the response time was atrocious. As far as not reving up like it should, then it may very well be the TPS. If you can, throw another throttle body in there (takes 10 minutes) and take it for a drive. If nothing changes, nothing changes. If it isn't reving above 3000 as it should... Would anybody else recommend checking the transmission speed sensor? It seems to me that if the TSS is going, it will do its best to keep the revs low. Good luck with the car, man! Avoid any telephone poles, don't end up like me :( Link to comment Share on other sites More sharing options...
FAST850R Posted March 20, 2010 Author Report Share Posted March 20, 2010 Sounds relatively normal, except when very close to the spark plug cover. Did anybody else notice that? It almost sounded like a rod knock. Anyways, what are you boosting? It sounds like my car did before I replaced my intercooler. The milage was terrible, and the response time was atrocious. As far as not reving up like it should, then it may very well be the TPS. If you can, throw another throttle body in there (takes 10 minutes) and take it for a drive. If nothing changes, nothing changes. If it isn't reving above 3000 as it should... Would anybody else recommend checking the transmission speed sensor? It seems to me that if the TSS is going, it will do its best to keep the revs low. Good luck with the car, man! Avoid any telephone poles, don't end up like me Thank you for the reply. I will listen very carefully to hear the knock sound. I think it might be serpentine belt tensioner pulley making noise. I will double check. My car is all stock except the upper engine mount. How should I check the inter cooler? I might check that. Hum...I guess I have to go to a junk yard to find another TB.... is there anyway to check TPS without swapping TB? TSS is the one connected top of the transmission? I think Volvo calls it vehicle speed sensor, no? If it was, then I already replaced it. What happened to your car? Link to comment Share on other sites More sharing options...
Guest 855T_Jack Posted March 20, 2010 Report Share Posted March 20, 2010 Thank you for the reply. I will listen very carefully to hear the knock sound. I think it might be serpentine belt tensioner pulley making noise. I will double check. My car is all stock except the upper engine mount. How should I check the inter cooler? I might check that. Hum...I guess I have to go to a junk yard to find another TB.... is there anyway to check TPS without swapping TB? TSS is the one connected top of the transmission? I think Volvo calls it vehicle speed sensor, no? If it was, then I already replaced it. What happened to your car? Its hard to tell from the video, I just noticed the sound is all. If you're not boosting properly, or at all, or if you're getting hesitation upon acceleration and the such. I good test is to spray water on the seams when its running. Before the intercooler, check the plumbing for it. The soft hoses tend to develop little holes and nonsense like that. Volvo very well may call it the vehicle speed sensor. Its a little plug shaped object right on top of the tranny... I can't think of a single definitive test for the tps except except for swapping it. If you're clever, the JY will let you have a TB for like 5 bucks. Either that or pick up the entire manifold and polish it I slid into a telephone pole coming around a turn at 20 when there was about 4 inches of slush on the ground the DAY after getting all of my issues worked out. Own that pole :/ Link to comment Share on other sites More sharing options...
FAST850R Posted March 20, 2010 Author Report Share Posted March 20, 2010 Its hard to tell from the video, I just noticed the sound is all. If you're not boosting properly, or at all, or if you're getting hesitation upon acceleration and the such. I good test is to spray water on the seams when its running. Before the intercooler, check the plumbing for it. The soft hoses tend to develop little holes and nonsense like that. Volvo very well may call it the vehicle speed sensor. Its a little plug shaped object right on top of the tranny... I can't think of a single definitive test for the tps except except for swapping it. If you're clever, the JY will let you have a TB for like 5 bucks. Either that or pick up the entire manifold and polish it I slid into a telephone pole coming around a turn at 20 when there was about 4 inches of slush on the ground the DAY after getting all of my issues worked out. Own that pole :/ Ouch, that sucks. Well I replaced the TSS so I know it's not the issue. I sprayed carb cleaner when it's running, but no idle changed what so ever.... I will re check the hoses, this time intercooler too.... I guess I will look for TPS at junk yards in local area.... Link to comment Share on other sites More sharing options...
jablackburn Posted March 20, 2010 Report Share Posted March 20, 2010 Hopefully something like this hasn't happened to your intercooler The TPS sounds like a good start to me, or at least it will help eliminate things. I hate throwing parts at a problem, but sometimes you've gotta start guessing things, and that's my best guess. It could also just be a dead turbo control valve, but that wouldn't explain the transmissions total reluctance to kick down as you described. Link to comment Share on other sites More sharing options...
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