P0302=Cylinder 2 Misfire Detected Need Help!! - Chevrolet Forum - Chevy Enthusiasts Forums

Go Back   > >
Log In 

Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 08-15-2006, 12:37 PM
Thread Starter
 
Join Date: Aug 2006
Posts: 8
Default P0302=Cylinder 2 Misfire Detected Need Help!!

On my 1996 Chevy c1500 pickup, 4x2 and 5.7L 350. I recently got this P0302 error code. Spark plugs are less than 10000 miles old. I changed out the spark plug wires, swapped spark plugs between cylinder 4,2, changed distributor cap and rotor. I had AutoZone clear the error but it still comes back after about 2 minutes. At lower speeds the truck sputters a lot. Has any one had this error before and knows what the possible cause might be? Any suggestions are appreciated.
Reply With Quote
  #2  
Old 08-15-2006, 05:19 PM
 
Join Date: Jul 2006
Location:
Posts: 504
Default RE: P0302=Cylinder 2 Misfire Detected Need Help!!

What kind of gas do you put in it? The computer can tell you which clyinder is misfiring by vibration. If you have a bad knock sensor it would cause vibration and poor idle or not be very drivable. I don't know how to check these but it is a thought. The knock sensor will adjust timing so you don't have a preignition. Good Luck
Reply With Quote
  #3  
Old 08-16-2006, 12:03 PM
Thread Starter
 
Join Date: Aug 2006
Posts: 8
Default RE: P0302=Cylinder 2 Misfire Detected Need Help!!

Last night I put in a can of B-12 Chemtool and a half tank of Premium gas (usually i put in regular) hoping it would clean out my fuel ejectors. I drove around last night for 20 or so miles with no change, then another 20 miles this morning, but still no change. I'll check on the knock sensor tonight. Is there any way to check to see if the fuel ejector is working properly?
Reply With Quote
  #4  
Old 08-16-2006, 12:51 PM
 
Join Date: Jul 2006
Posts: 265
Default RE: P0302=Cylinder 2 Misfire Detected Need Help!!

The gas is not going to be a problem. All you need is 87 and anything higher is just waist. And thinking if you run higher octane that it will clean out the system is silly also. Just go get a fuel system cleaner and pour it in the gas tank.
Reply With Quote
  #5  
Old 08-18-2006, 01:53 AM
 
Join Date: Aug 2006
Posts: 3
Default RE: P0302=Cylinder 2 Misfire Detected Need Help!!

Change coil packs around and see if it throws the same code on a different cylinder. It could just be a bad coil pack.
Reply With Quote
  #6  
Old 08-19-2006, 12:39 AM
 
Join Date: Jul 2006
Posts: 265
Default RE: P0302=Cylinder 2 Misfire Detected Need Help!!


Quote:
ORIGINAL: GMJunkie

Change coil packs around and see if it throws the same code on a different cylinder. It could just be a bad coil pack.
It only has 1 coil pack and a distributor.
Reply With Quote
  #7  
Old 08-19-2006, 02:09 PM
 
Join Date: Jul 2006
Location:
Posts: 504
Default RE: P0302=Cylinder 2 Misfire Detected Need Help!!

If the knock sensor is bad better gas can help, sometimes. I only say that because the knock sensor adjust the timing to keep the gas from igniting to early. If it is going bad then a higher octane will not ignite as soon and may get it to run better.
Reply With Quote
  #8  
Old 08-19-2006, 02:37 PM
 
Join Date: Jul 2006
Posts: 265
Default RE: P0302=Cylinder 2 Misfire Detected Need Help!!


Quote:
ORIGINAL: kcb37

If the knock sensor is bad better gas can help, sometimes. I only say that because the knock sensor adjust the timing to keep the gas from igniting to early. If it is going bad then a higher octane will not ignite as soon and may get it to run better.
What are you talking about? The octane rating is how much the gas can be squeezed before it detonates and last I checked timing doesn't change the compression ratio of a motor. Just changes when the sparkplug fires.
Reply With Quote
  #9  
Old 08-20-2006, 02:17 PM
 
Join Date: Jul 2006
Location:
Posts: 504
Default RE: P0302=Cylinder 2 Misfire Detected Need Help!!

NCHEVYHEVN when you have a high compression engine you need a higher octane so you don't have pre detonation, on a fuel injected, and I belive a throttle body, the knock sensor will change the timing so you can run a lower octane. If the Knock sensor goes bad and won't adjust the timing then 87 octane may not work, but if you put in 91 it has a possablility of running better because the timing won't need adjusted to make it run right. But then the knock sensor could just be all messed up and a little higher octane rating wouldn't do anything. If you can't figure it out from this I don't know what to tell you.
Reply With Quote
  #10  
Old 08-20-2006, 02:25 PM
 
Join Date: Jul 2006
Location:
Posts: 504
Default RE: P0302=Cylinder 2 Misfire Detected Need Help!!

akimber
I am curious, do you pull a lot with this? If you do how much weight?
I'm kinda thinking, cause you changed your plugs and your wires around, you don't really have anything else to make one single cylinder misfire.
But if your valve seats or valves themselves were bad it wouln't get the full effect of fire. It wouldn't hurt to do a compression test.
I think this is kinda a reach and probably not it but worth looking at.
Good luck.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Odb2 code P0302 Bhutzkal General Tech 4 09-06-2013 12:18 AM
98 chevy with P0302 code Bhutzkal Silverado & Fullsize Pick-ups 0 08-17-2013 10:00 PM
po455 large evap leak detected izzyrn Malibu 2 06-25-2012 12:56 PM
P0302 joejfsdc Malibu 2 10-14-2010 07:41 PM
1997 chevrolet Venture P0302 williamvaldivia Venture 1 06-04-2009 10:58 PM


Tags
05, 2000malibup0302, b12, camaro, chemtool, cobalt, cylinder, cylinders, hhr, lumina, misfire, p0302, trailblazer, traverse, vitamin, vitamins

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 11:56 PM.