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98’ s70 t5 manual/ car will not accelerate past 2.5k rpms

Volvo S70 Made from 1998 to 2000, this sporty model replaced the 850 sedan and instantly became a hit.

98’ s70 t5 manual/ car will not accelerate past 2.5k rpms

  #1  
Old 11-17-2018, 07:50 PM
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Default 98’ s70 t5 manual/ car will not accelerate past 2.5k rpms

Hi i have a 1998 volvo s70 t5 manual with 113k miles! I am second owner and purchased the car from auction with 110k miles. I did timing belt and water pump service after purchase. 2 days ago i was driving and i acclerated to about 2.5k rpms when the car started jerking really bad and wouldnt drive past 2.5k rpms! It feels like the car is dying of air or fuel! I cant hear anything odd about the car when it idles or drives! I also noticed the car has aftermarket “white fuel injectors”! If anyone has had this issue before or can redirect me please do so! Thank you
 
  #2  
Old 11-17-2018, 09:53 PM
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Is the check engine light on? if so get the codes read and we can go from there. If it is not on try unplugging the MAF sensor. It is on the air intake hose toward the firewall near the air filter box. Once unplugged it will set the check engine light, but if the car runs better, you have a bad MAF. Do a search about the MAF on this forum for more info
 
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Old 11-28-2018, 01:23 AM
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Sorry for late reply! I unplugged the MAF and car will not start! Check engine was present. I plugged it back in and the car drove fine!? Should i still be worried i ordered a new MAF just in case! Also check engine disappeared
 
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Old 11-28-2018, 08:38 AM
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Sounds like the MAF may be (or at least part) of the problem. Once the new one arrives put it in and we can go from there.
 
  #5  
Old 11-29-2018, 07:03 PM
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did you check the hoses from the turbo to the intercooler and onto the throttle body?
 
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Old 12-15-2018, 12:19 AM
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Yes i checked all hoses and everything seems to be intact and ok! But i just noticed my idle when i start up the car is very weird! It usually idles at 900 rpms but seems to jump a little, like from 900 to 970!
 
  #7  
Old 12-15-2018, 10:25 AM
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Was it running fine before you changed the timing belt? If so, are you ABSOLUTELY sure it is not off by one tooth? When is the last time the car had a full tune up? If it has been awhile I would put in new plugs, plug wires, air and fuel filter, Distributor cap and rotor and possibly a new coil. All that should run about $120 or so and will give you a solid foundation to work with.
 
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Old 02-18-2019, 04:08 PM
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I replaced cap and rotor, plugs! Took it for a drive and around 80mph full throttle car started misfiring again! Im going to change the oem bosch ignition coil to MSD and see if that helps
 
  #9  
Old 02-18-2019, 08:09 PM
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Sounds like it could be either a weak coil or a weak fuel pump....or clogged air or fuel filter.
 
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Old 02-19-2019, 09:37 PM
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Fuel pump and filter is next! I have IPD’s aftermarket filter which installed a month ago! I was thinking replacing coil packs too but oddly enough the 98 model does not come with coil packs! Looks like fuel pump/filter is my last hope!
 
  #11  
Old 02-19-2019, 11:10 PM
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98 models come with a single coil that can be replaced......
 
  #12  
Old 02-20-2019, 02:01 AM
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Thought you were referring to coils PACKS! but yes i replaced coil
 
  #13  
Old 02-20-2019, 08:36 AM
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Ok, sounds like a fuel or air flow issue........may have asked earlier, but do you get any check engine lights? Only other wild *** guess I could think of is a partially clogged catalytic converter or exhaust.....
 
  #14  
Old 02-20-2019, 04:58 PM
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Yes but only think showing up from check engine is misfire in cylinder 2,3,and 5! And random misfire detected. Im going to check out the spark plugs today see if they are still good!
 
  #15  
Old 02-21-2019, 08:31 AM
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We had almost the exact same issue with our S70 a year or so ago. I ended up changing the plugs, plug wires, coil, cap, and rotor and it finally went away. Sounds like you have also changed just about everything, but have you changed the plug wires?
 
  #16  
Old 03-19-2019, 07:38 PM
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I was going the performance route! But looks like i might be selling the car soon... i changed the fuel pump today too and the car is still misfiring! Im going to do a diagnostic check hopefully i find the problem!
 
  #17  
Old 03-20-2019, 08:03 AM
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The 98's are cheap and simple, so whatever the problem, it wouldn't be difficult to fix if you just knew what it was. If it misfires, then you don't have a clear indication of a lot of things via onboard diagnostics, unfortunately. It would be nice to know if it's going lean at high load, indicating a fuel delivery problem, or rich at high boost, indicating that your air is leaking out of the plumbing downstream of the turbo.

I hope you figure it out.

I also drive a 98 T5M. If you do give up on it, I am sure somebody else will take up the battle and have fun with it. I wish you were closer, I'd take it over.
 
  #18  
Old 03-20-2019, 09:39 AM
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BTW, I have a set of orange injectors (stock) if you want to try swapping out for the whites. IM me if interested
 

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