Question about Volvo 850

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Re: one otherwise terrific 1997 Volvo 850 turbo GLT sedan. Starts fine and runs fine when cold, but once it reaches operating temp / warmed up it sputters and stutters terribly under acceleration and/or load (up steeper inclines w/higher revs). Only very occasionally does this occur when idling in gear at a stop. I have a nice OBDII reader but never got a code UNTIL the one time it nearly stalled- then codes were mulitple, (a.)- random misfire (duh!) p300, (b. & c.)-cylinders 2&4 misfire, p302 & p304 and (d.) secondary air system p410. While I suspect the last one is my culprit, numerous q&a's from other forums give a large variety of answers. Have replaced the cap & rotor with new, the plugs look clean/fine, wires might be next. Also replaced the cam position sensor with a low mileage used to clear a seperate fault code- that code has not returned. Is "secondary air system" the turbo, or vacuum, or what? I'm a do it relatively competent myself-er, without much financial reserves. Any and all suggestions as to where I start and proceed from there would be greatly appreciated.

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Can you borrow an ignition coil and/or control unit for a day or two to check for the misfires?
The "Secondary Air System" should not be the problem since it merely is some air that gets blown into the exhaust line to increase start-up speed of catalytic cleaning. P0410 indicates a malfunction of this additional air system. This might be caused by the non-return valve in the air flow, the lambda sensor, or the air pump (which the turbo does not have, as far as I know). The valve is not too easy to get to but is quite often the source of the problem.

Good luck
Ingo

Posted on Mar 07, 2017

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Posted on Jan 02, 2017

  • 512 Answers

SOURCE: 98 jeep starts cold sputters, no power

the p0171 code is for a fuel system lean code......possible causes are a cracked exhaust manifold.....bad o2 sensor...bad coolant temp sensor fuel pump.....lean fuel can cause the other codes you have for misfires

Posted on Sep 30, 2008

  • 31 Answers

SOURCE: hesitates/stalls during acceleration

i would check fuel supply, volume adn pressure, i wold also look at the MAF sensor hot wire to see if it has a little chia pet growing on it.

Posted on Dec 13, 2008

  • 44 Answers

SOURCE: mustang 3.8litre.codes#p300,p302. did compression

are you loosing antifreeze. head gasket or cracked head?

Posted on Nov 06, 2009

  • 1 Answer

SOURCE: my engine light will start flashing somtimes, then

http://www.obd-codes.com/p0301

  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer

Posted on Feb 22, 2010

zaldyboy01
  • 293 Answers

SOURCE: Check engine light

Reset the computer.

Posted on Mar 06, 2010

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