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#1
01-23-2005, 06:10 PM
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1998 Surges
MY 1998 4.3 sonoma surges on acceleration and loss of power when going up hills, when cruise is set it also surges, when I give it to much gas rpm increase but will not shift or pick up speed. had 3 codes cat system efficiency below threshold(bank 1), mass or volume circuit range performance problem, and intake air temp circuit high input. replaced plugs , cap, rotor, pvc, air filter, mass air flow sensor, also done a visual on air intake duct. also engine light was on. cleared codes, ran for several days no new codes but still runs same. anyone have any ideas that I can check out before I go and spend to much money at the shop. (please help).
 (truck has 103,000 miles, mostly interstate miles)oh, I also replaced fuel filter 100 miles ago. Last edited by MYSONOMA; 01-24-2005 at 10:42 AM. 
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#2
02-01-2005, 03:09 AM
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Re: 1998 Surges
Have the codes checked again.
Not all codes set a check engine light. Was the O2 code for bank 1 sensor 1?
__________________
1995 Factory Blazer Service Manual for sale, PM if interested.
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#3
02-05-2005, 05:36 PM
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Re: Re: 1998 Surges
Quote:
THANKS FOR REPLY, SAME CODE CAME UP AGAIN CAT SYSTEM, SO I TOOK A CHANCE AND TOOK EXHAUST APART AND FOUND CAT WAS HALF PLUGED, CLEANED OUT AND RUNS GREAT.
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