Help Please!! 03 SE pulled out code P-0300B random misfires. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-17-2007, 12:50 AM   #1
Junior Member
Thread Starter
 
Join Date: Feb 2006
Location: Naples, Maine
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
GM-Maine is on a distinguished road
Default Help Please!! 03 SE pulled out code P-0300B random misfires.

Need car working badly. Code P-0300B Random misfire and looked further and seems fuel bank one is closed, fuel bank 2 is disabled. Car is not driveable, misses bad and uses alot of fuel when I drove it the rest of the way home. Happened on the road after it had been driven about 10 miles and was fully warmed up. Won't rev above 4k even in park, bad egg smell from tailpipe and fuel smell when just starting from a start. 52,000 miles on it, non SC. Looking possibly towards fuel problem but not really sure and nothing more coming out of the determinator scan tool. Need help and a hint PLEASE! cb
GM-Maine is offline   Reply With Quote
Old 03-17-2007, 02:02 AM   #2
Senior Member
True Car Nut
 
Join Date: Jul 2004
Location: Grand Rapids, Mi
Posts: 5,656
Thanks: 0
Thanked 0 Times in 0 Posts
Archon is on a distinguished road
Default

There are many things that could cause your problem. First off, your car will not rev higher than about 4k RPM in park or neutral. That is hard on the engine, so a rev limiter is programmed into the computer to prevent the engine from running any faster than that without a load.

Can your provide the codes that go with your fuel problem? Are you losing any coolant? Start by replacing your plugs and wires, and possibly post pictures of the old plugs once you pull them out. Check for rust or corrosion on the coil terminals, and test the coil per the procedure in techinfo

http://www.bonnevilleclub.com/forum/...e=article&k=33

That will be a good start. Then post back with your findings.
Archon is offline   Reply With Quote
Old 03-17-2007, 11:23 AM   #3
Junior Member
Thread Starter
 
Join Date: Feb 2006
Location: Naples, Maine
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
GM-Maine is on a distinguished road
Default

Unfortunately there are no codes pending or hard for the fuel issue. I got that info. off the data stream I ran and recorded 2 separate tests. Data stream info is as follows: STFT bank 1 sensor 1 =10.9% ; STFT bank 1 sensor 2 = 99.2%; RPM=847; temp= 185; spark adv.=22; Fuel system status bank 1= closed; Fuel system status bank 2=disabled.
This one has 3 double coils controlling 2 cyl. each, and with one whole fuel bank showing disabled and a random misfire instead of a specific 1 or 2 cyl. misfire I am a little buffaloed. Also a week ago found some coolant on the transmission and seemed like it ran down the rear drivers side corner of the intake or plenum area, but cleaned it off in that area with some engine cleaner and figured I would just keep a eye on it and it'* still dry. At that time it was about -5 below zero with a bad wind so I figured maybe just a freak thing. No running problems after that for a whole week, and I work 38 miles away. It has been about 500 miles or so since that happend. I heard these 3800'* have intake issues, what are they and how can I tell?
GM-Maine is offline   Reply With Quote
Old 03-17-2007, 12:12 PM   #4
Senior Member
True Car Nut
 
Join Date: Jul 2004
Location: Grand Rapids, Mi
Posts: 5,656
Thanks: 0
Thanked 0 Times in 0 Posts
Archon is on a distinguished road
Default

Information on the intake problem can be found here, in techinfo.
http://www.bonnevilleclub.com/forum/...e=article&k=38

A search of the forum will provide you with many threads regarding it. Is the coolant in your expansion tank dropping?

Checking the coils is a good troubleshooting process. While it may not be the main cause of what your are experiencing, it can be contributory. If one coil has a problem, you would have the one or two cylinder misfire. If more than one, which is rare, but not unheard of, you'll have more misfires. The coil terminals have been known to rust.

Bank one being closed indicates that the system is in closed loop. We'll have to wait for someone a bit more familiar with that part of the scan tools on if there is a sensor for that for bank 2, or if it just uses one. Do you have reading for STFT at higher RPMs? What does the MAF and O2 sensors show? What about fuel pressure? Have you tested that? Checking the condition of the plugs can provide a lot of information also.

We can head off in several different directions, here but let'* try to follow a bit more of a methodical process.
Archon is offline   Reply With Quote
Old 03-17-2007, 01:06 PM   #5
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Forget bank 2. That'* the O2 behind the CAT. It has nothing to do with fueling or running.

Look at your injector pulsewidth or duty cycle to verify all 6 injectors are firing.
willwren is offline   Reply With Quote
Old 03-17-2007, 07:24 PM   #6
Junior Member
Thread Starter
 
Join Date: Feb 2006
Location: Naples, Maine
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
GM-Maine is on a distinguished road
Default

Went out agian and scanned it and did a thorough check on the intake and plenum and found an external leak on the back side of the plenum on the firewall drivers end of the plenum. Scanner shows misfires on 3 and 6, which are on the same coil, coil tested good but changed it anyway, leak may have caused these to cylinder to get wet. I can't get the plug wires off those two cylinders or any others for that matter, to change the plugs and look at them. Any tricks to getting these off? Do you think this is safe to drive to repair shop like this? These 2 cylinders are missing on every rev.. Thanks, cb
GM-Maine is offline   Reply With Quote
Old 03-17-2007, 09:29 PM   #7
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

Twist the boots back and forth. They'll break loose. I'll be curious to see what all 6 plugs look like. Put them in order when you pull them, or mark them with cylinder numbers as they come out. When you get them out, check the resistance of each plug wire. Post your numbers here.
willwren is offline   Reply With Quote
Old 03-18-2007, 04:23 AM   #8
Senior Member
Posts like a Camaro
 
Join Date: Dec 2005
Location: Clovis, CA
Posts: 851
Thanks: 0
Thanked 0 Times in 0 Posts
MACDRIVE is on a distinguished road
Default

Quote:
Fuel system status bank 1= closed; Fuel system status bank 2=disabled.
Quote:
found an external leak on the back side of the plenum on the firewall drivers end of the plenum.
So is the external leak related to the fuel banks being shut down?
MACDRIVE is offline   Reply With Quote
Old 03-18-2007, 11:59 AM   #9
Junior Member
Posts like a Ricer Type-R
 
Join Date: Aug 2002
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
willwren is on a distinguished road
Default

No, Mac. It'* not. And the fuel isn't shut down either. Read the replies above.
willwren is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Buick Century Misfires Cylinder 1 code p0301 susiespontiac Buick 3 03-17-2015 11:24 PM
misfires n such please help clesabre Buick 3 09-14-2014 11:26 AM
Random Misfires SLE2005 2000-2005 6 03-05-2013 01:03 PM
Random misfires with code P0321 FaceShot 1992-1999 9 09-21-2009 09:23 AM
1998 Random cylinder misfires and code P0420 jllracer55 1992-1999 0 10-07-2008 12:41 PM


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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 11:29 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.