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Cary Carr Posted on Feb 10, 2018
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2002 saab 9-3 turbo car starts and runs when driving during acceleration turbo boost shoots to the red and car shuts down P0300 random misfire what can I do.

Car idles good when setting in park when put in drive the cars runs fine up to about 15mph then when increase acceleration the turbo boost shoots to the red and the car seems like it has lost all power and shuts down car will start right back up has fuel flow and the plugs have been changed.

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Lee Wilkin

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  • Expert 60 Answers
  • Posted on Feb 10, 2018
Lee Wilkin
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By the sound of it you could have one or both of these problems.
1. a vacuum leak which is causing the car to over boost.
2. ignition fault which is causing the car to die.


1. look in the engine bay and look for small rubber hoses, check all you can find and look for cracks or splits. make sure you check the small rubber hose on the turbo itself.

2. you may have a faulty spark plug, coil pack, HT lead (depending on which engine you have)

1 is probably your boost problem
2 is your cutting out problem
i hope this helps

5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Aug 03, 2008

SOURCE: saab 900 s

what kind of car do you have?
Is your car with distributor or electrical egnition?
the fuel pump is not the at fualt.
in your son car are only two common problems or electricity does not come. Or fuel does not come good like is supose to come.

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Anonymous

  • 2 Answers
  • Posted on Oct 18, 2008

SOURCE: Car started bogging and dying

COIL PACTS GOING BAD OR LOCKOUT ON TRANSMISSION DISCONNECT IT AND SEE IF IT HELPS

Anonymous

  • 184 Answers
  • Posted on Dec 15, 2008

SOURCE: Random engine misfiring- fault code P0300- 1999 cutlass

Could be coil pack(s), fuel injectors, etc. Rather than retype it, just check out this great article on P0300 random misfire - http://www.obd-codes.com/p0300

ash seder

  • 166 Answers
  • Posted on Jan 01, 2009

SOURCE: 2000 Camry 4 cyl 2.2L.

sounds like you have a problem with the spark the coil may be on its way out or there may be oil in the spark plug holls shorting out the spark.
your best bet is to pull the leads out 1 at a time and and look down and check for oil if there is oil there get a new rocker cover gasket.
if no oil refit plug leads loosely and start the car remove one lead at a time slowly and look at the spark cumming out the end off the lead is it blue? if so it is ok if it is yellow and dull you have a coil problem. also check that the spark is only coming out the end of the lead as it may be coming out the side of the lead and shorting to earth,
you can do this by slowly moving the lead around the top of the spark plug holl and see were the spark is coming from

be carfull no to shock your self as it hearts like hell

good luck

roedmondson

Romel Edmondson

  • 68 Answers
  • Posted on Feb 14, 2009

SOURCE: 2000 CIVIC System too lean Cylinder 3 and 4 misfire Deteced

  1. P0171: This means that the oxygen sensor has detected a lean air-fuel ratio. This can be caused due to a vaccuum leak or a problem in the HO2S circuit or the HO2S (Heated Oxygen Sensor) itself. (Bank one Sensor one). This is commonly located along the exhaust pipe. It could also be a bad Mass Air Flow sensor or a bad Engine Coolant Temperature sensor. Diagnostic checks will be needed to be carried out to be verified though
  2. Well as for the other codes, it means #3&4 cylinders are misfiring. It is a possibility that the P0171 code mite have caused the others to show up. I can be wrong though. But it is a strong possibility. If the air fuel mixtue is too lean indeed, mis-firing will occur, unless it is an actual electronic and not a mechnical problem. By the way, when these codes appear, how is the engine's performance. Does it remain the same or behaves poorly?

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Sounds like the recirculation valve (aka diverter valve) is failing. A lot of turbo cars that have them end up with failures from them, since they're usually cheaply made from plastic, and the diaphragms inside don't hold up over time.

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