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post #1 of (permalink) Old 09-07-2003, 11:09 PM
dadare
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K1500 Power Loss - lean condition

Got a 1995 K1500, 125k miles, clean and kept up, but it just started losing power/acceleration. Run at 65 mph on the highway and it doesn't want much more. Going up hills it lacks the punch. Good compression, idles and seems to run smoothly, everything serviced regularly. Dediced to change the plug wires, just because it was time, and took a look at the plugs. Very white but not blistered on the insulators..or if so, only very slightly. So, she's running lean. Anybody know what could cause this with the computer compensating? Had a new intake manifold gasket put on 9 months ago, it's fine. Been told the injectors might be slightly clogged. Try and run Techron thru them several times a year. Heard failed O2 sensor will cause it to run rich. Any ideas on what to check?

Thanks.....
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post #2 of (permalink) Old 09-08-2003, 12:18 AM
 
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Re: K1500 Power Loss - lean condition

Changed the fuel filter yet? B.
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post #3 of (permalink) Old 09-08-2003, 03:09 AM
 
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Re: K1500 Power Loss - lean condition

fuel filter
intake system have carbon build up?
check spray pattern of injectors with a timing light to see if clogged
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post #4 of (permalink) Old 09-09-2003, 08:51 PM
dadare
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Re: K1500 Power Loss - lean condition

Fuel filter is good, after the intake manifold was off for the gasket replacement I took a look at the valves through the ports. They could be cleaner but until I rebuild the whole motor, thought I'd run with it. I think it's the fuel injectors but don't really know how to troubleshoot. Kindof hard to see a fuel pattern and if it's only slightly restricted, really hard. Any tips on that?
post #5 of (permalink) Old 09-09-2003, 09:33 PM
kevin_z71
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Re: K1500 Power Loss - lean condition

had a 94 c3500 w/454 and it sucked fuel bad and smoked like a chimney. found out after i sold it, the 02 sensor was bad.
post #6 of (permalink) Old 09-12-2003, 07:50 AM
Phazer
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Re: K1500 Power Loss - lean condition

Try unbolting the exhaust in front of the converter. Run it down the road. Might be plugged.
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