Login  |  Register
Nissanhelp.com - All About Nissan
All Models, All Years 2014 370Z Coupe 2014 370Z Coupe Nismo 2014 370Z Roadster 2013 Altima Coupe 2014 Altima Sedan 2014 Armada 2014 Cube 2014 Frontier Crew 2014 Frontier King 2014 GT-R 2014 JUKE 2014 JUKE NISMO 2013 Leaf 2014 Maxima
2014 Murano 2013 CrossCabriolet 2013 NV Cargo 2013 NV Passenger 2013 NV200 2014 Pathfinder 2014 Pathfinder Hybrid 2014 Quest 2014 Rogue 2014 Sentra 2014 Titan Crew 2014 Titan King 2014 Versa Note 2014 Versa Sedan 2014 Xterra Concept Models
MyNissan Do-It-Yourself Maintenance Owners Manuals Recalls/Campaigns Service Bulletins Service Manuals Tech Challenge Game Nissan OBDII Codes Glossary & Acronyms Cost Estimator More...
Member's Ride Photos Stock Photo Gallery
Classifieds - For Sale Classifieds - Wanted To Buy Classifieds - Mechanic Wanted Classifieds - Auto Services Search Auto Parts Ultimate Reflector Auto Sun Shades Custom Fit Car Covers Auto Snow Shades Berber Auto Mats Coco Auto Mats Designer Auto Mats Diamond Plate Auto Mats Fashion Auto Mats Flexomats Auto Mats Hexomats Auto Mats
Register FAQ Social Groups Mark Forums Read
Forums Nissan Models Sentra 05 Sentra Misfire on Startup- Code P0300
Forgot Password? Join Us!


Sentra Nissan Sentra Discussion Forum

User Tag List

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 11-29-2009, 09:08 AM
tman17m's Avatar
Registered User
2005 Sentra
 
Join Date: Sep 2009
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default 05 Sentra Misfire on Startup- Code P0300

My 2005 nissan sentra with a 1.8L engine has been having a misfire problem on startup for about 6 months now (I was going to let it go and hope it went away). The car starts fine (on the first try) but misfires for 3-5 seconds on startup almost every start. After the initial 3-5 seconds the misfire goes away and the car runs fine. The check engine light came on and I read the codes with a scan tool. The code came back P0300 - random misfire.

I changed all the spark plugs about 3 weeks ago. No change in the startup condition, but now the car misfired really badly on the highway. Got back and had two codes, P0300 and P0302. Swapped #2 and #4 plugs, cleared the codes, test drove, now P0300 and P0304. figured bad spark plug. Replaced the plugs again. Car now ran fine on highway, but still misfire on startup and P0300 code.

When i changed the plugs, the #2 cylinder spark plug was very hard to get out, and looked much worse than the other cylinders. See the attached pic. Mind you, these plugs have about 1k miles on them. I tested the compression on the engine- #1-158, #2-145, #3-165, #4-165. Nissan spec says 168 min, 190 standard, so they were all low. I might try retesting the compression, but im pretty sure i did it right (I screwed the tester as tight as i could get it into the spark plug hole).

The coolant level in the car has also been low- ive had to top it off about once a month or so. Do you think its a head gasket? Would buying a cooling system pressure tester and seeing if the cooling system holds pressure tell me anything additional?

I shined a flashlight down into the cylinders when i had the spark plugs out to test the compression- the #2 cylinder piston top was much shinier than the others.

Sorry for the long post, thanks for any help!
Attached Thumbnails
05 Sentra Misfire on Startup- Code P0300-100_2391.jpg  

Last edited by tman17m; 11-29-2009 at 09:52 AM.
Reply With Quote
  #2 (permalink)  
Old 11-29-2009, 12:05 PM
NissanTech's Avatar
Super Moderator
2004 Xterra
 
Join Date: Jun 2005
Location: California
Age: 43
Posts: 11,409
Thanks: 428
Thanked 466 Times in 421 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Default

Quote:
Swapped #2 and #4 plugs, cleared the codes, test drove, now P0300 and P0304
Do you think it is possible that you may accidentally swap the coil as well? The problem sounds like a bad ignition coil and Nissan has had many ignition coils issues.
__________________
CarZone Auto Repair - Nissan Service Center - Van Nuys CA

Nissan OBD-II Trouble Codes

Show your support to our forums and get unlimited access to the knowledge base files: Subscribe
Reply With Quote
  #3 (permalink)  
Old 11-29-2009, 12:46 PM
tman17m's Avatar
Registered User
2005 Sentra
 
Join Date: Sep 2009
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Default

after i had the P0302, i first tried swapping the #2 and #3 coils. cleared the codes and went for a test drive. car still misfired, read the code and it stayed at P0302. At this point i swapped the #2 and #4 spark plugs, cleared the codes and went for a drive. code moved to P0304. thats how i determined it was a spark plug

i left this part out (about swapping coils) because it didnt help me diagnose the P0300 code. presently, i am only getting the P0300 code which doesnt help me since i cant pinpoint a specific cylinder. i could do an ignition coil test per the service manual, but i havent done that yet.

edit: I could be wrong, but wouldnt a faulty ignition coil make the engine miss all the time? I didnt do the ignition coil test because after the initial startup and misfire, the car runs fine, so i ruled out the ignition coils.

Last edited by tman17m; 11-29-2009 at 12:50 PM.
Reply With Quote
Reply

Bookmarks

Tags
code, misfire, p0300, sentra, startup

Thread Tools
Display Modes

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 Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -8. The time now is 10:25 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.0
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.