Question about Cars & Trucks
Im getting a random misfire on my 98 chevy truck 5.7 engine p0300 all the time and on my scantool cyl 1 is misfiring really bad so far ive replaced ign system,fuel system,tps,egr,knock sensor,engine,cam and crank sensor,cleaned the mass airflow,o2 sensors,and the problem doesnt go away im thinking i might have gotten a bad injector assy cause its really noisy
Run a compression test to check for loose valve seat insert . no 1 cylinder
other wise it is a fuel pressure problem and faulty injector/s
Posted on Sep 26, 2017
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Posted on Mar 23, 2018
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Posted on Jan 11, 2018
What Causes a P0300 Code?
Low Fuel Pressure
EGR system malfunction
Internal Engine Problems (such as low compression)
Less Common Causes
Faulty Spark Plugs and/or Wires
Camshaft or Crankshaft sensors
Posted on Sep 26, 2017
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Posted on Jan 02, 2017
Check the distributor cap/wires/spark plugs. Also might be clogged injectrors (injector cleaner)
Hope that helps
Posted on Mar 18, 2009
MASS AIR FLOW CAN CAUSE PROBLEMS IF ITS DIRTY OR SKEWED .YOUR IDLE AIR INLET PASSAGES OR THROTTLE BORE IS DIRTY OR FULL OF DEPOSITS.BESURE REPLACE EGR VALVE GASKET THE OLD GASKET WILL LEAK.CHECK FOR THROTTLE PLATE THROTTLE SHAFT OR LINKAGE IS DAMAGED OR STICKING.
Posted on Dec 30, 2010
Testimonial: "THANKS. Going to pull it in the shop this weekend and not leaving until I figure it out or blow it up! LOL"
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P0300....Random/Multiple Cylinder Misfire Detected
so its got a misfire and quickest way out here to avoid a expensive garage visit is to change plugs and Ht leads and see what happens ,HT leads is proper english for fire wires by the way ,see iam learning american ---slowly---
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