The truck failed the test, here are the results @ idle RPM 631, co2 14.7, O2 0.1, HC ppm 396, CO% .50 @ 2500 RPM 2482, co2 15.1, O2 0.0, HC ppm 11, CO% .01 the truck was listed as a gross polluter, the fuel cap failed funtional test and the check engine light came on in the middle of the test. fault code po306 misfire detected cylinder #6 the truck does have a miss at idle when I took it in for the test, I replaced plugs with Ac/ Delco iridiem plugs new wires, new Rotor and new distrributor cap, and a new PVc valve, and new gas cap. the truck still has a miss at idle but seems to run great at hwy speeds Milage is 155,000, Anyone have suggestions as to whats causing the miss and what else I might need to change to get my truck back on the road.
Slite posibility of head gasket leaking a little or could be a worn piston ring you have changed every thing else
I replaced plugs, wires, distributor and rotor, pvc. the truck is not losing water or antifreeze, it doesnt smoke while running or starting. I guess next step compression check. but wondering about map sensor or 02 sensor.
possible but i was thinking compresion as well thats why i thought head gasket
It was a stuck valve, I replaced the motor, issue is fixed, I did see the value in just doing a valve job for a motor that had a150,000 miles on it.
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SOURCE: Bad crankshaft sensor on a 1994 GMC k1500 5.7L TBI Auto?
if your o2 sensor is reading too lean then you have a vacume leak spray brake cleaner on all your vacume hoses one at a time if nothing then spray it around your intake manifold gasket they are usually the culprit
SOURCE: 2000 gmc jimmy 4.3L misfire on cyl 4 and cyl 5 at
Clean the egr valve which would cause rough ideling and misfire........Hope this helps u out.
SOURCE: 96 gmc vortec will not start
I AM LOOKING AT TIMING ISSUES OR INTAKE MANIFOLD LEAK.OR EGR VALVE STUCK OPEN.
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