1998 Cheyenne, 322,000 miles, codes are misfires, cam/crank sensor's

Asked by Mar 17, 2016 at 08:37 PM about the 1998 Chevrolet C/K 1500 Cheyenne Extended Cab LB RWD

Question type: General

I have changed the transmission, the cam and crank shaft sensors, i have changed the plugs and wires...and i changed the coil.added seafoam to fuel. changed the EGR valve..that being said, i am still getting in order P0300 misfire, P0108 Manifold absolute Pressure Sensor High Input, P0401 EGR flow insuffencient, P1345 Camshaft to crankshaft position correlation fault. and then it repeats with Random Misfire again...I'm very frustrated...I took it to a Mechanic Pro-Tech shop and they told me that the fuel injectors were dumping too much fuel...I asked them to re-time the distributor, but they refuse and said that it was the fuel injectors.. Please I need input before i spend more money

2 Answers


If that shop said it was the fuel injectors,it may be, but you can check by doing a fuel leak down test. Get a fuel pressure gauge and hook it up to the Schrader Valve on the intake, cycle the key on off until the pressure is built up, should be 56 to 63 lbs. and watch the gauge to see if it drops over 5 lbs. in 3 minutes. If it does, the fuel injectors, spider lines, and regulator would need to be replaced as a hole unit.

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This is interesting on the p1345 code.... - Crankshaft Position-Camshaft Position Correlation... Possible causes... - Engine mechanical condition-Valve timing off - Cam sensor or crank sensor are loose on their mounting - Faulty camshaft position sensor - Faulty crankshaft position sensor... Some Tech notes... If this DTC started after recent internal engine repairs, inspect for proper engine mechanical timing. With the camshaft cover removed and the #1 cylinder at top dead center, make sure that the darkened chain links are lined up with the alignment marks on the exhaust and intake cam sprockets... If a P0016 or P1345 is resetting without any engine performance concerns but the above information did not isolate a cause for the DTC, replace the Cam Phaser Actuator sprocket.

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