Question about 2008 Chevrolet Silverado 1500 2WD

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Number one cylinder misfire on v6 ... 50k miles. replaced plugs, this happens occasionally then goes away. could this be injector problem?

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  • cheap repair Sep 30, 2010

    have you checked for proper spark from the coil?

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  • Chevrolet Master
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Hi:
If you have replaced the spark plugs already, consider replacing the wires, if you have them, or if your engine has the individual coils on each plug, then it could be the problem.

Posted on Sep 30, 2010

  • lsco1152 Sep 30, 2010

    Dealer replaced one plug! I replaced all six plugs. Getting 301 (number one cylinder misfire) code, and then a code for o2 sensor. Ran 2 cans of injector cleaner thru system, disconnected battery, reconnected, and now check engine light is off and truck is running great. But this happens every few months or so again. I will replace wires and see what happens. Thanks.

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  • Master
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It could be an injector, although unusual on a car so young. Perhaps also check the fuel pressure relief valve FPR and also the coil set. The coil set can be checked by looking at the quality of spark exhibited by each spark plug when taken out in turn and held against the car frame or engine block. To check the FPR have the engine warmed up at idle. Detach the vacuum line to it. The engine should speed up for a couple of seconds and then drop in revs and start to run roughly. If this happens your FPR is fine and you can reconnect the vacuum line. If the engine fails to speed up momentarily then this could indicate a fault. If you can, block the vacuum line to the inlet manifold and connect a tube to the FPR and **** on it (to create and artificial vacuum. The engine should become slower and laboured at full vacuum. If no vacuum can be sustained than the FPR will need to be replaced. To clean the suspect injector back flush it. This is an important principle that if you suspect anything getting blocked in one direction then the way to clear it is to apply pressure in the opposite direction. Back flush onto a cotton towel and if there is debris then do the same to the other injectors as a precaution.

Posted on Sep 30, 2010

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1 Answer

Misfired cylinder 6, replaced coil, plug Misfired cylinder 5, replaced coil, plug Misfired unsure which yet, all of these happening within a week. It will run fine for a day or so after rep


change all plugs with proper ones - they are picky for some reason - do not change number or brand from original - coils were probably ok, - get some injector cleaner and run through it but check for exhaust leak at e g r tube - is a common over looked cause of misfire - a thing to keep in mind is misfire isn't always spark issue. hope I was of some help

Apr 20, 2014 | 2003 Lincoln Town Car

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Miss fire


Hi Richard, I'm glad to help! Richard, there's a lot of things that can cause one certain cylinder to misfire. I would first: "Replace the Spark Plug and Spark Plug Wire for number 4 and see if the misfire goes away. If it doesn't then you need to do a "Compression Test" for cylinder # 4 and compare it to another cylinder and if its more then 25 Psi difference then you need to do a "Cylinder Leak Down Test" to see where you are loosing the compression. If the compression is good and you have new plug and wire and it still misfires. Then you'll need to check and make sure you have good spark coming from the coil. If you have good spark coming from the coil. Then you'll need to check and make sure the # 4 Injector is firing. Hope this helps and have an awesome day Richard.

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Miss fire at cylinder 6 on my 2004 grand am 3.4 i have replaced new plug new coil and wire whats next still miss fires


With the engine running and the cylinder misfiring tap (key word is tap) the injector with a screwdriver a couple of times. If the misfire goes away replace the injector.

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2000 Celica GT engine misfires periodically


Hello, it could be an injector problem, try replacing the #2 injector/.

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Aug 21, 2012 | 2001 Oldsmobile Silhouette

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1996 isuzu rodeo keeps reading #2 misfire runs good xcept when cold it hesitates most times or jus occasionally hesitates then the check engine light flashes and its guzzling gas i only got 50 miles on a...


A misfire alarm typically means the coil pack mounted above the sparkplug indicated in the misfire had gone defective.

To test it, swap the coil pack with another cylinder, and see if the misfire goes from #2 to the cylinder you put it on.

If the misfire continues to be on #2, then consider changing the sparkplugs.

I hope this helps.

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1 Answer

Acura mdx 2001 ingine codes p1399 andp300 as well others codes 305


All these codes indicate you have a misfire on cylinder number 5.
P1399/P0300 - Random/Multiple Cylinder Misfire Detected
P0305 - Cylinder #5 Misfire Detected

Causes:
- Improper spark plug at cylinder #5
- Insufficient compression at cylinder #5
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #5
- Fuel injector #5 may be faulty
- Intake air leak at cylinder head

Solutions:
- Perform Injector Service
- Replace Spark Plug #5
- Replace Injector #5
- Replace Ignition Coil #5

Mar 09, 2011 | Acura MDX Cars & Trucks

3 Answers

CODES-PO301-PO303-PO316- CHANGED PLUGS & WIRES. STILL MISS ON START UP, GOES AWAY MOST OF THE TIME ABOVE 1000 R.P.M


P0301 - Cylinder 1 Misfire Detected.

Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0303 - Cylinder 3 Misfire Detected.
Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

Causes:
- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Base engine
- Damaged Powertrain Control Module

Solutions:
Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

Jan 17, 2011 | 2002 Mercury Sable

1 Answer

Giving a 300 and a 301 code where do i start sounds fine when started and then when you put in gear it start misfiring


P0300 - Random / Multiple Cylinder Misfire Detected

Possible Causes:
- Improper spark plug
- Insufficient compression
- Incorrect fuel pressure
- The injector circuit is open or shorted
- Fuel injectors may be faulty
- Intake air leak

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plugs
- Replaced Injectors
- Replaced Ignition Coils

P0301- Cylinder Number 1 Misfire Detected

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak at cylinder

Possible Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Most likely your issue is with cylinder number 1. Follow the info I have provided and you should be able to solve this issue.

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3 Answers

Error code p0303 cylinder 3 misfire


po303 is misfire on number 3 cylinder. It could be a bad spark plug or wire, maybe a loose plug wire, could be alot of things. injector problem drop of water in fuel that happened to hit that cylinder. but most likely a plug misfired. I would clear the code and see if it happens again. If so give care a tune up.

Aug 09, 2008 | 1999 Ford Taurus

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