S2000 Under The Hood S2000 Technical and Mechanical discussions.

Throwing Error code P0303

 
Old 02-22-2018, 04:24 PM
  #1  
Registered User
Thread Starter
 
Join Date: Feb 2018
Posts: 1
Likes: 0
Received 0 Likes on 0 Posts
Default Throwing Error code P0303

It tells me that cyl 3 is misfire, I swapped 2 & 3 coil pak and still throwing the same code cyl 3 misfire?
Check engine Light blinks at idle and code error repeats at about 50 miles. Car runs like a champ?
Any ideas what could be causing this?
Thanks
Desert commuter is offline  
Old 02-23-2018, 03:29 AM
  #2  
 
rpg51's Avatar
 
Join Date: Jun 2016
Location: Vermont
Posts: 2,456
Received 97 Likes on 90 Posts
Default

How many miles on the engine? Any recent work done or events occur with the car?

The way I think about this is to understand that a misfire is generally caused by lack of spark, lack of proper fuel/air mixture getting to cylinder, or lack of properly timed compression. In no particular order. There is a long list of possible causes for each of these possible conditions. We all think about spark first for some reason. The first thing I would do is to pull the spark plugs and examine their condition, that can tell you a lot. What do they look like? Does #3 look different than the others? Do they all look healthy? Are they oily? Black? Grey/brown? How old are they?

Depending on the outcome of that examination, decide what to do next to make the correct diagnosis. I would not just randomly start replacing things. Also, if you do start guessing and making changes, which is what we all sometimes fall into , do one thing at a time.
rpg51 is offline  
Old 02-23-2018, 07:11 AM
  #3  
Registered User
 
HawkeyeGeoff's Avatar
 
Join Date: Mar 2017
Location: Waterford, MI - America's High Five
Posts: 577
Received 57 Likes on 49 Posts
Default

Originally Posted by rpg51 View Post
How many miles on the engine? Any recent work done or events occur with the car?

The way I think about this is to understand that a misfire is generally caused by lack of spark, lack of proper fuel/air mixture getting to cylinder, or lack of properly timed compression. In no particular order. There is a long list of possible causes for each of these possible conditions. We all think about spark first for some reason. The first thing I would do is to pull the spark plugs and examine their condition, that can tell you a lot. What do they look like? Does #3 look different than the others? Do they all look healthy? Are they oily? Black? Grey/brown? How old are they?

Depending on the outcome of that examination, decide what to do next to make the correct diagnosis. I would not just randomly start replacing things. Also, if you do start guessing and making changes, which is what we all sometimes fall into , do one thing at a time.
+1 start with looking at your sparks.

If the sparks look normal ---> Compression test (if that's normal) ---> Replace injector

Something like that. I feel like I've posted about how to diagnose misfires 5x's in the last few weeks; search is your friend, homie.
HawkeyeGeoff is offline  
Old 02-23-2018, 07:44 PM
  #4  
Registered User
 
Join Date: Feb 2018
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Default

The car has 265,000 miles on it.
‘These plugs are only30 days old. I don’t know what the old one looked like
The compression is:
1 = 140
2 = 170
3 = 135
4 = 200
ijohn83 is offline  
Old 02-24-2018, 03:17 AM
  #5  
 
rpg51's Avatar
 
Join Date: Jun 2016
Location: Vermont
Posts: 2,456
Received 97 Likes on 90 Posts
Default

It is unfortunate that you don't know what the plugs looked like when they were changed. Did you change the plugs or someone else? What do the 30 day old plugs look like now? You should check them.

How long have you owned the car? What do you know about its past history?

Check the plugs. But, I'd say those compression results are poor and may be the cause of the misfires. You need to find out why the engine is not producing good compression. I have ideas about how to go about sorting that out, but I'm going to bow out and let others with more experience with this particular engine chime in.

Last edited by rpg51; 02-24-2018 at 03:20 AM.
rpg51 is offline  
Old 02-24-2018, 03:51 AM
  #6  
Moderator
 
Billman250's Avatar
 
Join Date: Jul 2002
Location: Long Island, New York
Posts: 20,720
Received 270 Likes on 210 Posts
Default

90% of posted threads in s2ki lately have lots of missing info.

What year is your car??
Billman250 is offline  
Old 02-24-2018, 04:48 PM
  #7  
Registered User
 
Join Date: Feb 2018
Posts: 2
Likes: 0
Received 0 Likes on 0 Posts
Default

My car is a 2005 and I bought it new from the dealership. No negative history. I barely lift the hood. I commute from the Antelope Valley, CA to Hollywood, CA over the Los Angeles Crest mountain. About 115 miles round trip every day.

~John
ijohn83 is offline  
Old 02-25-2018, 02:59 AM
  #8  
 
rpg51's Avatar
 
Join Date: Jun 2016
Location: Vermont
Posts: 2,456
Received 97 Likes on 90 Posts
Default

Originally Posted by ijohn83 View Post
The car has 265,000 miles on it.

It certainly does not owe you anything.
rpg51 is offline  
Old 02-26-2018, 10:33 PM
  #9  
 
HarryD's Avatar
 
Join Date: Oct 2008
Location: San Francisco
Posts: 1,063
Received 35 Likes on 34 Posts
Default

Originally Posted by rpg51 View Post
It certainly does not owe you anything.
It's a Honda not a Porsche. It owes him at least another 100,000 miles.

+1 on the compression numbers aren't looking very good -- hopefully he found a mechanic down in SoCal that's not the shop that we shall not name.
HarryD is offline  
Old 02-27-2018, 05:16 AM
  #10  
Registered User
 
HawkeyeGeoff's Avatar
 
Join Date: Mar 2017
Location: Waterford, MI - America's High Five
Posts: 577
Received 57 Likes on 49 Posts
Default

Yeah get those valves checked out. That can cause lower compression. That's a pretty large gap between the highest and lowest numbers.
HawkeyeGeoff is offline  

Quick Reply: Throwing Error code P0303


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands