Aug 16, 2010 · The most logical starting point, when troubleshooting a misfire on your 4.8L, 5.3L or 6.0L pickup, van or SUV is testing the COP coils for spark. Because a failed COP coil is usually the reason behind the misfire in the majority of cases. Here are my specific recommendations: Check for misfire codes with a scan tool first . ok first the vehicle 2003 silverado LS 2500HD 4x4 automatic former plow truck fleet vehicle 114,000 miles 1800 hours ok the lq4 in the truck has developed a misfire at 2500rpm or above the only cylinders that are misfiring are 1,5,6,and 8 it is only throwing a p0300 random misfire code Oct 26, 2012 · my 2004 Chevy 2500hd 6.0l vortec recently put out a random misfire code.... so i was told by a buddy of mine to try plugs and wires first, so i did replacing them with brand new Bosch plugs and a Bosch wires, that worked for all of a day then a very slight misfire came back, along with the blinking engine light, the code again was the Po300 ... P0305 CHEVROLET Tech Notes The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 5. Oct 11, 2018 · Random/Multiple cylinder misfire detected. Chevrolet code P0300 indicates that one or more cylinders are experiencing misfires. A misfire occurs when an insufficient amount of fuel is burning in a cylinder. The efficient burning of fuel is essential to engine operation as the combustion of fuel is what provides the energy to power the engine in ... 2003 Chevrolet Silverado 1500 4.3L Hesitation, Misfire Posted to GM Driveability on 1/28/2013 18 Replies Misfiring on all cylinders check for vacuum on dipstick tube to see if intake manifold gasket leaking causing misfires-none check fuel [...] install lab scope on crank sensor-ok install lab scope on cam sensor-random small spike at top of ... P0300 CHEVROLET - Cylinder Misfire Detected Random Cylinders - Possible causes - Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient ... P0300 Diagnostic Code - Random Misfire Symptoms. Engine may stumble or miss Engine may be hard to start you may notice no issues Cause Failing spark plugs or spark plug wires Bad coil or coil pack ... 2003 Chevy Silverado Chevy 5.3 multiple misfire Could be caused by the following: Faulty spark plugs or wires Faulty coil (pack) Faulty oxygen sensor(s) Faulty fuel injector(s) Burned exhaust valve Faulty catalytic converter(s) Stuck/blocked EGR valve / passages Faulty camshaft position sensor Defective computer Aug 18, 2012 · This article will help you to understand some of the most common causes of misfires and misfire codes (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308) on the GM 4.3L, 5.0L and 5.7L equipped pick ups and SUVs. I'm also gonna' offer you a simple diagnostic strategy (one I've used with a lot of success) and guide you to the test ... Aug 18, 2012 · This article will help you to understand some of the most common causes of misfires and misfire codes (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308) on the GM 4.3L, 5.0L and 5.7L equipped pick ups and SUVs. I'm also gonna' offer you a simple diagnostic strategy (one I've used with a lot of success) and guide you to the test ... ok first the vehicle 2003 silverado LS 2500HD 4x4 automatic former plow truck fleet vehicle 114,000 miles 1800 hours ok the lq4 in the truck has developed a misfire at 2500rpm or above the only cylinders that are misfiring are 1,5,6,and 8 it is only throwing a p0300 random misfire code P0300 CHEVROLET Tech Notes The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are a common caused of multi-cylinder misfiring. May 07, 2015 · The Chevy Silverado hooked up to the Scanner showed a misfire on number eight cylinder.The 5.3 in the chevy Silverado is easy to switch ignition coil and plug wire with another cylinder. Repair Information for P0300 Chevrolet code. Learn what does P0300 Chevrolet Cylinder Misfire Detected Random Cylinders means, location and how to repair? Jan 19, 2010 · 2003 Chevrolet Silverado 2500 HD 6.0L Misfire, MIL Lamp on Posted to GM Driveability on 1/19/2010 11 Replies Hello I have an 03 Silverado here with a random miss code p0300, It has new wires & cheaper champion plugs, it has had an injector cleaning done. Aug 16, 2010 · The most logical starting point, when troubleshooting a misfire on your 4.8L, 5.3L or 6.0L pickup, van or SUV is testing the COP coils for spark. Because a failed COP coil is usually the reason behind the misfire in the majority of cases. Here are my specific recommendations: Check for misfire codes with a scan tool first . How to get incentive tokens neverwinter2003 Chevrolet Silverado 1500 4.3L Hesitation, Misfire Posted to GM Driveability on 1/28/2013 18 Replies Misfiring on all cylinders check for vacuum on dipstick tube to see if intake manifold gasket leaking causing misfires-none check fuel [...] install lab scope on crank sensor-ok install lab scope on cam sensor-random small spike at top of ... I have an 03 silverado with a 5.3l vortec. I recently was driving and all of the sudden it started running like crap. It idles rough an excelerates rough. Throws a random misfire code. 17 Answers. My truck throws a random misfire code, a system too lean code, and a intake manifold stuck open code is what I believe it said last. 2000 chevrolet silverado, misfire on #5 cyl,test says EGR valve, replaced this and no change, replaced plugs, no change, but now test says multiple misfires, ran compression test 75% on 3 cyl. and 71% on the rest, this is a 5.7 liter engine with 160,000, May 23, 2018 · I had a random Misfire code on my 2000 chevy silverado, Except it was at higher rpms. It was a p0300, most misfires were on 5 and 8. I unpligged the Maf and it ran better, most gm vehicles will run with it unplugged. If it runs better unplugged its a bad maf. 2003 Chevrolet Silverado 1500 4.3L Hesitation, Misfire Posted to GM Driveability on 1/28/2013 18 Replies Misfiring on all cylinders check for vacuum on dipstick tube to see if intake manifold gasket leaking causing misfires-none check fuel [...] install lab scope on crank sensor-ok install lab scope on cam sensor-random small spike at top of ... P0300 CHEVROLET - Cylinder Misfire Detected Random Cylinders - Possible causes - Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient ... May 07, 2015 · The Chevy Silverado hooked up to the Scanner showed a misfire on number eight cylinder.The 5.3 in the chevy Silverado is easy to switch ignition coil and plug wire with another cylinder. Oct 26, 2012 · my 2004 Chevy 2500hd 6.0l vortec recently put out a random misfire code.... so i was told by a buddy of mine to try plugs and wires first, so i did replacing them with brand new Bosch plugs and a Bosch wires, that worked for all of a day then a very slight misfire came back, along with the blinking engine light, the code again was the Po300 ... Repair Information for P0300 Chevrolet code. Learn what does P0300 Chevrolet Cylinder Misfire Detected Random Cylinders means, location and how to repair? May 23, 2018 · I had a random Misfire code on my 2000 chevy silverado, Except it was at higher rpms. It was a p0300, most misfires were on 5 and 8. I unpligged the Maf and it ran better, most gm vehicles will run with it unplugged. If it runs better unplugged its a bad maf. Aug 27, 2018 · The engine is also not firing all of the fuel, so raw fuel is also passing through Cylinder 4 into the exhaust. Mileage may suffer as well when your Silverado has P0304 as well. Chevy Silverado P0304 Definition. P0304 is a cylinder specific misfire code, which means that Cylinder 4 is misfiring and causing the code. 2003 Chevy Silverado 1500 LS 4WD 5.3L V8 P0300 Misfire Code 1 Answer. I have a check engine light on for over two years. It has been two P0300 misfire codes. In the past 2 years I have changed out all 8 plugs and wires, fuel pump, fuel filter, mass air flow sensor, clea... 2000 chevrolet silverado, misfire on #5 cyl,test says EGR valve, replaced this and no change, replaced plugs, no change, but now test says multiple misfires, ran compression test 75% on 3 cyl. and 71% on the rest, this is a 5.7 liter engine with 160,000, P0305 CHEVROLET Tech Notes The P0305 code means that the cylinder 5 is misfiring or is randomly misfiring. Start by checking for intake leaks and if no leaks are found the next step is to replace the spark plugs on cylinder 5. 2003 chevy 4.3 v6 engine misfires going uphill engine loses power going up long steep hills only - Chevrolet Cars & Trucks question ... po300 random misfire it needs ... ok first the vehicle 2003 silverado LS 2500HD 4x4 automatic former plow truck fleet vehicle 114,000 miles 1800 hours ok the lq4 in the truck has developed a misfire at 2500rpm or above the only cylinders that are misfiring are 1,5,6,and 8 it is only throwing a p0300 random misfire code ok first the vehicle 2003 silverado LS 2500HD 4x4 automatic former plow truck fleet vehicle 114,000 miles 1800 hours ok the lq4 in the truck has developed a misfire at 2500rpm or above the only cylinders that are misfiring are 1,5,6,and 8 it is only throwing a p0300 random misfire code P0300 CHEVROLET Tech Notes The P0300 code means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are a common caused of multi-cylinder misfiring. It has a new AC/Delco spider injector system, new cap, rotor, new sparks plugs, spark plug wires, new coil, fresh set of intake manifold gaskets and factory rebuilt distributor. Truck ran perfect for 4,000 miles, now I have a P0300 random misfire. The misfire occurs only at 1500 rpm (cold or hot), it idles perfect and at higher rpms. P0300 CHEVROLET - Cylinder Misfire Detected Random Cylinders - Possible causes - Faulty spark plug (s) - Faulty ignition coil (s) - Clogged or faulty fuel injector (s) - Intake air leak - Fuel injectors harness is open or shorted - Fuel Injectors circuit poor electrical connection - Ignition coils harness is open or shorted - Ignition coils circuit poor electrical connection - Insufficient ... Jan 19, 2010 · 2003 Chevrolet Silverado 2500 HD 6.0L Misfire, MIL Lamp on Posted to GM Driveability on 1/19/2010 11 Replies Hello I have an 03 Silverado here with a random miss code p0300, It has new wires & cheaper champion plugs, it has had an injector cleaning done. Aug 11, 2015 · This is how to diagnose a code PO300 Random Misfire Code. Keep Christ at the center God Bless. ... HOW TO DIAGNOSE & FIX CODE PO300 RANDOM MULTIPLE CYLINDER MISFIRE DETECTED ... Chevy Silverado ... Jul 25, 2017 · 2007 Silverado 2500HD Classic, 182,000 miles, 6.0L I've been reading for weeks on these humble forums about all the P0300 trouble codes. My engine has a miss, but it would occasionally go away (and so would the engine light). A day later it would come roaring back and stay for a week or better, and then go away again. I messed with it for a month. Yesterday on the way to work my 2000 Chevrolet Silverado 1500 4WD with the 4.8L V8 Vortec engine started flashing a check engine light. I read it and it was a P0300 Random/Multiple Misfire. I had experienced a slightly rough idle previously (nothing serious) and had been unable to track it down. A P0300 diagnostic code indicates a random or multiple misfire. If the last digit is a number other than zero, it corresponds to the cylinder number that is misfiring. A P0302 code, for example, would tell you cylinder number two is misfiring. Unfortunately, a P0300 doesn't tell you specifically which cylinder (s) is/are mis-firing, nor why. Aug 14, 2018 · Chevy Silverado P0300 Definition. P0300 is a general and random misfire code, which means that the code is not going to tell you which cylinder is causing the misfire. Something is causing cylinders to misfire at random, which is a lot less cut and dry than a cylinder specific misfire code. See Also: P0300 Chevy OBDII Code Jul 25, 2017 · 2007 Silverado 2500HD Classic, 182,000 miles, 6.0L I've been reading for weeks on these humble forums about all the P0300 trouble codes. My engine has a miss, but it would occasionally go away (and so would the engine light). A day later it would come roaring back and stay for a week or better, and then go away again. I messed with it for a month. I have a 1997 Chevy Silverado 1500 5.7L vortec and I have a random misfire I have changed the plugs and wire’s and cap and button and the ignition core and it’s still has a random misfire. What do I need to do? ok first the vehicle 2003 silverado LS 2500HD 4x4 automatic former plow truck fleet vehicle 114,000 miles 1800 hours ok the lq4 in the truck has developed a misfire at 2500rpm or above the only cylinders that are misfiring are 1,5,6,and 8 it is only throwing a p0300 random misfire code Aug 27, 2018 · The engine is also not firing all of the fuel, so raw fuel is also passing through Cylinder 4 into the exhaust. Mileage may suffer as well when your Silverado has P0304 as well. Chevy Silverado P0304 Definition. P0304 is a cylinder specific misfire code, which means that Cylinder 4 is misfiring and causing the code. Nov 16, 2015 · I recently received this vehicle from my brother-in-law, I have done the maintenance on this vehicle for years and have never been able to figure out the random misfire. Now that I have the vehicle I want to fix it. The vehicle is a 2003 Chevy Silverado 2500hd, 6.0 V8, 4×4, 193,000 miles. May 07, 2015 · The Chevy Silverado hooked up to the Scanner showed a misfire on number eight cylinder.The 5.3 in the chevy Silverado is easy to switch ignition coil and plug wire with another cylinder. Jul 17, 2017 · Check engine light and P0300 misfire codes on Silverado Sierra Fix P0300 misfire code on Silverado Sierra. GM has issued a service bulletin #PIP5147A to address a situation where you have a check engine light and retrieve trouble codes relating to a misfire. Oct 26, 2012 · my 2004 Chevy 2500hd 6.0l vortec recently put out a random misfire code.... so i was told by a buddy of mine to try plugs and wires first, so i did replacing them with brand new Bosch plugs and a Bosch wires, that worked for all of a day then a very slight misfire came back, along with the blinking engine light, the code again was the Po300 ... It has a new AC/Delco spider injector system, new cap, rotor, new sparks plugs, spark plug wires, new coil, fresh set of intake manifold gaskets and factory rebuilt distributor. Truck ran perfect for 4,000 miles, now I have a P0300 random misfire. The misfire occurs only at 1500 rpm (cold or hot), it idles perfect and at higher rpms. Humic acid supplementP0300 Random Misfire code? 2003 5.3. ... 2014 silverado owners ... A forum community dedicated to GMC and Chevy full size owners and enthusiasts. Come join the ... 2003 silverado 6.0 liter p0300 code multi cyl misfire what can it be? ... Chevy Silverado. ... 2014-12-18 17:44:51. P0300 Diagnostic Code - Random Misfire. Symptoms. Engine may stumble or miss ... Nov 16, 2015 · I recently received this vehicle from my brother-in-law, I have done the maintenance on this vehicle for years and have never been able to figure out the random misfire. Now that I have the vehicle I want to fix it. The vehicle is a 2003 Chevy Silverado 2500hd, 6.0 V8, 4×4, 193,000 miles. Arma 3 civilian weapons mod