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Lost power

Tiny
PAPADC
  • MEMBER
  • 2005 ISUZU ASCENDER
  • 6 CYL
  • 2WD
  • AUTOMATIC
2005 isuzu ascender. On long trips on interstate, car would lose some power(still runs, but little power), would be fine after a couple of minutes. Now is continual problem. Changed air filter but not much help. What should I check next?
Tuesday, July 12th, 2011 AT 12:11 AM

13 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
I would check for codes and restricted exhaust to start with.
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Tuesday, July 12th, 2011 AT 12:18 AM
Tiny
RASMATAZ
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Verify the fuel pressure and comeback with the readings-we start here
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Tuesday, July 12th, 2011 AT 12:20 AM
Tiny
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How much of a chance could it be the catalytic converter?
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Tuesday, July 12th, 2011 AT 12:22 AM
Tiny
SATURNTECH9
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I dont know odds thats why I said do a back pressure test to check for possible cat issues have it scanned for codes and checking the fuel pressure like rasmatz said wouldnt be a bad idea.
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Tuesday, July 12th, 2011 AT 12:26 AM
Tiny
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Had it scanned last week. Only problem shown was some to do with the engine being 21% but should be around 5 or 6 %(or vice-versa). Sound familiar?
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Tuesday, July 12th, 2011 AT 12:28 AM
Tiny
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Old code was something to with something "below threshhold". Had it erased & it hasn't come up again
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Tuesday, July 12th, 2011 AT 12:31 AM
Tiny
SATURNTECH9
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That really doesnt ring a bell 21 percent of what?Throttle postion?Dont really know need more details about that one. How checking the fuel pressure and back pressure?
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Tuesday, July 12th, 2011 AT 12:34 AM
Tiny
RASMATAZ
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P0420

Check the Catalytic Converter if its clogged-up by doing what Sat9 suggested on backpressure test of the exhaust system-
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Tuesday, July 12th, 2011 AT 12:34 AM
Tiny
SATURNTECH9
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Would have been helpfull to have known the exact code number it was.
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Tuesday, July 12th, 2011 AT 12:35 AM
Tiny
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Not sure. Idles fine, doesn't skip. But when I press gas pedal a little hard, it doesn't want to go. If I ease into the gas it will evenually get to normal speed
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Tuesday, July 12th, 2011 AT 12:38 AM
Tiny
RASMATAZ
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Disable the EGR valve and see what happens might be opening too soon-don't work have the computer rescanned again -maybe something might just pop up-
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Tuesday, July 12th, 2011 AT 12:44 AM
Tiny
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Pretty sure the code was P0420. Was erased last week. Engine light not on again
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Tuesday, July 12th, 2011 AT 12:45 AM
Tiny
SATURNTECH9
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Without doing some testing one can only guess what might be wrong. When you do some testing let us know what you find.
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Tuesday, July 12th, 2011 AT 12:51 AM

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