1998 CHEVY SILVERADO REBUILT ENGINE MULTIPLE OR RANDOM MISF

  • Tiny
  • Evan Tyrrell
  • 1998 Chevrolet Silverado

Engine Mechanical problem
1998 Chevy Silverado V8 Four Wheel Drive Automatic 130000 miles

1998 Chevy k1500 350 129000 miles

I recently rebuilt this engine and did all the mechanical work myself. I had a very experienced guy do the block work, and he put a new crank in it. I kept the same cam and heads. The mechanic that did the block said the cam was alright, and the heads/valves appeared alright to myself and several others. After several hassles and tinkering I am to the point where the engine will run but brings up the po300 trouble code, twice. I have been through the ignition system several times, and everything appears fine. I have no compression tester, and did the valves according to a haynes manual. What next? I am getting limited on what I can do myself and dont wanna go broke at the shop. Any suggestions?

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Friday, March 5th, 2010 AT 10:17 AM

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  • Tiny
  • evantyrrell
  • Member

Other than the misfire codes I have been getting o2 sensor codes since before the rebuild. After the rebuild I got an additional code for the o2 heater sensor, I believe on bank one. Today I tried unhooking the map and maf sensor, It didnt seem to have any effect on the motor.

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Friday, March 5th, 2010 AT 1:35 PM
  • Tiny
  • Evan Tyrrell
  • Member

Parameter Description Value
DTC for which Freeze Frame was Stored P0300
Fuel System 1 Status Open Loop
Fuel System 2 Status Open Loop
Calculated LOAD Value 26.67 %
Engine Coolant Temp 80.60 F
Short Term Fuel Trim - Bank 1 0.00 %
Long Term Fuel Trim - Bank 1 0.00 %
Short Term Fuel Trim - Bank 2 0.00 %
Long Term Fuel Trim - Bank 2 0.00 %
Intake Manifold Absolute Pressure 20.73 inHg
Engine RPM 2,544.50 rpm
Vehicle Speed Sensor 0.00 mph
Air Flow Rate Mass Air Flow Sensor 7.78 lb/min
Absolute Throttle Position 29.02 %

idk if this helps

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Friday, March 5th, 2010 AT 3:36 PM
  • Tiny
  • 2CarPros Linsey
  • Member

Hi, Thanks for using 2CarPros. Com. I wanted to see where your at with your problem and see if was any additional information we could help you with. I f so please let us know, Thanks again.

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Friday, March 12th, 2010 AT 4:33 PM

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