LOST POWER

2005 Isuzu Ascender

Tiny

papadc

July, 12, 2011 AT 12:11 AM

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?

FOUND 4169 RELATED QUESTIONS

13 Answers

Tiny

saturntech9

July, 12, 2011 AT 12:18 AM

I would check for codes and restricted exhaust to start with.

Tiny

rasmataz

July, 12, 2011 AT 12:20 AM

Verify the fuel pressure and comeback with the readings-we start here

Tiny

papadc

July, 12, 2011 AT 12:22 AM

How much of a chance could it be the catalytic converter?

Tiny

saturntech9

July, 12, 2011 AT 12:26 AM

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.

Tiny

papadc

July, 12, 2011 AT 12:28 AM

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?

Tiny

papadc

July, 12, 2011 AT 12:31 AM

Old code was something to with something "below threshhold". Had it erased & it hasn't come up again

Tiny

saturntech9

July, 12, 2011 AT 12:34 AM

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?

Tiny

rasmataz

July, 12, 2011 AT 12:34 AM

P0420

Check the Catalytic Converter if its clogged-up by doing what Sat9 suggested on backpressure test of the exhaust system-

Tiny

saturntech9

July, 12, 2011 AT 12:35 AM

Would have been helpfull to have known the exact code number it was.

Tiny

papadc

July, 12, 2011 AT 12:38 AM

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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