Chevy 6.0 misfire at idle

Mar 11, 2020 · Change idle to 790 RPM, studders and misfires occur at the same rate as 550 RPM. Change all idle settings to 800 RPM, drive like this for a week, aside from pulling hard on the brakes at a stop, truck runs so smooth. Replaced injector in #2, matched the new injector p/n to the one previously installed, installed new seals on the other 3. I've got a 2007 Silverado 2500HD 6.0 Vortec with a PO300 random misfire/rough idle issue. 150k miles on the truck. I've read most threads on the subject (much appreciation!), and will try some more solutions today. The truck runs rough at idle, though smoothes out as the rpm's rise. One time, it did completely misfire and limped back to my shop.Idle the engine. Turn all the accessories ON (i.e. lights, A/C, rear defogger). Set the Park Brake. Transmission in drive. Monitor all of the Misfire Cur. counters on the misfire data list (one counter per cylinder) using the scan tool. Manual Transmission. Install the scan tool. Idle the engine. The following TSBs of Chevrolet are related to DTC P1682. 2002 Chevrolet Trailblazer Electrical System TSB Details …; 2002 Chevrolet Trailblazer Engine and Engine Cooling TSB Details …

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6.0 - 170k Fairly Recent Fuel Pump, Spark Plugs, Oil Change, Cleaned TB and MAF sensor I just pulled exhaust manifolds and replaced the gaskets. I now have a bad misfire. Only at an idle/low rpms. No CEL, but i did get a p0300 from the computer. I can't figure this out for the life of me. I have about 50psi fuel pressure while running, 58 ...

My 1998 Chevy Silverado has a vortec 5.7L (350) and is misfiring in cylinders 5 and 7, no codes are thrown on the dash but havnt got to run a OBD 2 scan on it yet. At idle you can hear the misfire but while going down the road the truck starts to backfire randomly, it gets worse when the engine gets under load (going up a hill or starting in 2nd gear instead of 1st) I have major lose of power ...
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.
But the misfire usually isn’t bad enough to cause it to stall unless the engine is idling and can’t maintain a high enough idle speed. MORE POSSIBILITIES Vacuum leaks on engines with airflow sensors can lean out the fuel mixture and may cause enough lean misfire at idle to kill the engine.
Chevy Vortec Multiple Misfire Code P0300 - Cheap Fix (Crankshaft Sensor Relearn) Here's a way to possibly solve a random misfire code on a Chevy Vortec 6.0. Mine is a 2000 2500 with 74,000 miles. Chevy Vortec Multiple Misfire Code P0300 - Cheap Fix (Crankshaft Sensor Relearn) 2007 Silverado 2500HD Classic, 182,000 miles, 6.0L I've been
May 11, 2016 · A restriction of 8-10 percent on a single fuel injector can be enough to cause a misfire. When this occurs, unburnt oxygen enters the exhaust and makes the O2 sensor read lean.
Nov 14, 2009 · Idle problem, misfire and backfire Results 1 to 19 of 19 This is a discussion on Idle problem, misfire and backfire within the General Help forums, part of the LSx Technical Help Section category; My car has a slight miss at idle.
Dec 13, 2013 · when you first start it it stumbles bad then kinda has a rough idle but when you accelerate to about 2 grand on rpm's it runs normal can barely feel misfire then when you let go of throttle it acts like It wants to die but just runs rough. it doesn't start smoking till you run it for about 5 or more minutes then it starts to fill garage up with white smoke but if you give it gas it turn almost ...
Check engine light on, misfire and injector codes Check engine light on, misfire and injector codes. GM has issued a PIP bulletin #PIP4924D to address a check engine light on, misfire codes, injector codes on the following vehicles: 2009 Buick Allure (Canada) 2009-2014 Buick Enclave
2003 Silverado rough idle, idles good after "check engine" light My 2003 silverado idles very rough, and then the - Chevrolet 2003 Silverado Ss question
Take a Deep Breath I'm working on a 2002 Chevy Avalanche 1500 equipped with the 5.3L V8. The vehicle has over 250,000 miles on it and the customer has stated that the engine has a random misfire at idle after highway driving. This usually occurs at a traffic light or stop sign. The Check Engine …
Misfire codes are handled differently for different years. Some misfire codes go by firing number order, in other words a misfire code for #2 would be #8 cylinder because it is the #2 cylinder in firing order. Check the service manual for the year you are working on. Firing order is: INJECTORS
Re: Random misfire at idle Apr 03 2012, 8:11pm i have a similar problem with my 2002 chevy silverado 2500 hd 6.0 l but it occurs when i accerlate from a full stop. i have noticed it more in colder weather but i was told it could be my egr valve . what are you thoughts
Misfire codes are handled differently for different years. Some misfire codes go by firing number order, in other words a misfire code for #2 would be #8 cylinder because it is the #2 cylinder in firing order. Check the service manual for the year you are working on. Firing order is: INJECTORS
Dec 07, 2018 · Chevy Trailblazer P0306 Definition. P0306 is a cylinder specific misfire code, which means that Cylinder 6 is misfiring and causing it. An important thing to understand when finding the location of Cylinder 6 is that it’s going to be the sixth cylinder in the firing order. It won’t be the sixth cylinder that you might see when looking at ...
200k Vortec 6.0 running rough with misfire - how much to fix? Looking at buying a 2500HD with a 6.0 Vortec running rough/misfiring with a CEL, about 200k miles. It’s sat for a few years so could just be bad gas but unlikely.
Dec 05, 2020 · Engine Misfire or Rough Engine Idle on GM 4.8L, 5.3L, 6.0L is becoming; more common and getting harder to diagnose. Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174.
91 chevy g 20 has no power wont idle; ... 2004 Express 6.0 won't start; ... 2001 Express intermitant misfire code
2015 6.0 L96 Misfire Mystery Jul 21 2018, 3:51am Guys, I've searched forums and googled my a$$ off for the last two weeks and haven't found much of anything related to misfires on the newer models.
Jun 26, 2015 · Chevrolet Silverado 2007-2013: How to Clean MAF Sensor. How to Clean MAF Sensor This simple cleaning can make your truck's idle smoother and prevent an expensive replacement. This article applies to the Chevrolet Silverado 1500 (2007-2013). The MAF (Mass Air Flow) ...
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 21, 2011 · Re: Random misfire at idle Apr 03 2012, 8:11pm i have a similar problem with my 2002 chevy silverado 2500 hd 6.0 l but it occurs when i accerlate from a full stop. i have noticed it more in colder weather but i was told it could be my egr valve . what are you thoughts
Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
Dec 13, 2013 · when you first start it it stumbles bad then kinda has a rough idle but when you accelerate to about 2 grand on rpm's it runs normal can barely feel misfire then when you let go of throttle it acts like It wants to die but just runs rough. it doesn't start smoking till you run it for about 5 or more minutes then it starts to fill garage up with white smoke but if you give it gas it turn almost ...
rough idle on 2004 chevy Silverado 2500hd 6.0 engine. 0 votes . asked May 9, 2017 by anonymous. rough idle but smooth when running. Vehicle: 2004 chevy silverado ... 0 votes . answered May 10, 2017 by Reynaldo (11.0k points) Rough idle usually will set a misfire code condition. If there is no CK ENG LT or any pending code for the rough idle ...
Mar 07, 2010 · Misfire, irratic low idle and stallout Alright so, my waterpump failed. I replaced the waterpump and through a broken optispark connector that had been taped on by the previous owner, water flooded the opti and it died.
Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
Sup fellas, I've recently gotten a cylinder 3 misfire on my 96 SS. Background Info: GM 845 cam 1.6 Crane Golds K-motion springs 3400 Stall CPT Trans Pro-Race/Street 3.73s Eaton Posi Afterburners 52mm TB Dual Cone CAI 2.5 Catbackw/ Spintech Prostreets (No Cats) Those are pretty much the...
Page 1 of 3:Testing a Misfire Code (P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308) on GM 4.3L, 5.0L and 5.7L. Random Misfire Tests. Rough Idle Tests. Multiple Misfire Tests. Check Engine Light is On with a Misfire Code.
6.0 - 170k Fairly Recent Fuel Pump, Spark Plugs, Oil Change, Cleaned TB and MAF sensor I just pulled exhaust manifolds and replaced the gaskets. I now have a bad misfire. Only at an idle/low rpms. No CEL, but i did get a p0300 from the computer. I can't figure this out for the life of me. I have about 50psi fuel pressure while running, 58 ...
Nov 14, 2009 · Idle problem, misfire and backfire Results 1 to 19 of 19 This is a discussion on Idle problem, misfire and backfire within the General Help forums, part of the LSx Technical Help Section category; My car has a slight miss at idle.
Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
03 chevy express 6.0 misfire code po300, rough idle, sputters and stalls. - Chevrolet 2005 Express question
This is a customer's 2002 that he brought in because he thought it might need injectors. Let us know what you think! (THIS IS AN EXTREME EXAMPLE!!) LB7 powered (through 2004 Duramax) Chevys and GMCs all suffer from injector failure at some point in their service life. Many fail as early as 50k miles. GM recognized this issue and actually had
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. Why? 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.
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. Why? 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.
Feels like it's running on three cylinders or something. Only codes I've been able to get are a P0106 (map sensor) pretty consistently, and one time a P0301 (cylinder 1 misfire). I can get it to start, and it'll run very rough, but it will sit and idle without even giving any codes.
DEFINITION: Engine runs unevenly at idle. If severe, the engine or vehicle may shake. Engine idle speed may vary in RPM. Either condition may be severe enough to stall the engine. 1 : Was the Powertrain On-Board Diagnostic (OBD) System Check performed? — Go to Step 2
Nov 14, 2009 · Idle problem, misfire and backfire Results 1 to 19 of 19 This is a discussion on Idle problem, misfire and backfire within the General Help forums, part of the LSx Technical Help Section category; My car has a slight miss at idle.
Exterior; Fog lamps; Grille guard w/brushed aluminum accents, integrated fog lamps; High Intensity Discharge headlamps (HID) Heating, Ventilation & Air Conditioning; Air condition
Dec 05, 2020 · Engine Misfire or Rough Engine Idle on GM 4.8L, 5.3L, 6.0L is becoming; more common and getting harder to diagnose. Because, GM V8 engines are very prone to a rough idle and engine misfire when cold. The check engine light may also come on, with codes P0300, P0171 and PO174.
Our trusty Fiat Ducato (2003 2.3 JTD) has developed an occasional "misfire". As it's a diesel it's probably not the right word, but what it does is like a misfire in a petrol engine - it "staggers ...
ONLY at idle, it may be a sticking valve due to carbon. seen alot of this lately. if its a secondary electrical misfire(plugs, wires, coil), it will misfire worse under high electrical load such as pulling a hill in OD with tcc locked up at about 45mph, just before it shifts out of tcc and into a lower gear. this is a good place to start, really hard to say without a scanner to see whats going on.
Aug 29, 2018 · hi i have Chevrolet caprice 2009 v8 6.0 ltr im having same problem but with cylinder 7 , (p0307) , often it accrues in idle or low speed , i replaces all spark plugs , i cleaned fuel injectors and swapped its position , i checked the cables and swapped the coils , but problem still exist .
Take a Deep Breath I'm working on a 2002 Chevy Avalanche 1500 equipped with the 5.3L V8. The vehicle has over 250,000 miles on it and the customer has stated that the engine has a random misfire at idle after highway driving. This usually occurs at a traffic light or stop sign. The Check Engine …

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I have a 2011 Chevy 2500hd with 6.0. The truck has developed a misfire at idle and partially on the gas. I have replaced all the spark plugs, all 8 injectors, moved coil packs around, replaced MAF, MAP, b1s1 02 sensor (was getting codes for that sensor only), ECU, fresh gas and added cleaners, cl... Jun 26, 2018 · cold starts chevy k2500hd Hello, I am the original owner of my k2500 HD. I'm an auto body and frame tech, so I'm somewhat knowledgable mechanically, and maintain my own vehicles. Truck is as follows 6.0 engine, 4L80 e trans, 4.10 rr axle. Mods are a K&N fipk2 installed at 25,000 mi, throttle body spacer installed at 25,... B. Idle Time: Run engine (do not drive) for 2 1/2 minutes with the air conditioner on and rear defroster on. During this period the ECU will be running the Oxygen Sensor Heater self-test, Air Injection System Passive Air test, EVAP Purge "No Flow" test, Misfire Detection.

The following TSBs of Chevrolet are related to DTC P1682. 2002 Chevrolet Trailblazer Electrical System TSB Details …; 2002 Chevrolet Trailblazer Engine and Engine Cooling TSB Details … Mar 07, 2010 · Misfire, irratic low idle and stallout Alright so, my waterpump failed. I replaced the waterpump and through a broken optispark connector that had been taped on by the previous owner, water flooded the opti and it died.

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