Misfire Assistance (P0300) - Page 2 - 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 07-10-2014, 07:45 PM   #11
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,150
Thanked 785 Times in 614 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

Your next step should have been to swap that bad coil with say, 3/6 coil, and see if the problem moved to another cylinder....if it did, bad coil, if it didn't, bad ICM....
Tech II is offline   Reply With Quote
Old 07-10-2014, 08:07 PM   #12
Member
Posts like a V-Tak
Thread Starter
 
goeppngr's Avatar
 
Join Date: Mar 2005
Location: Milwaukee, WI
Posts: 59
Thanks: 0
Thanked 3 Times in 2 Posts
goeppngr is on a distinguished road
Default

Good call, Tech II. I just did that and the misfiring cylinders misfired remained 1/4. This would lead to the ICM.

My brain must not be working after a long day at work, and a non functioning vehicle...
goeppngr is offline   Reply With Quote
Old 07-10-2014, 09:33 PM   #13
Senior Member
True Car Nut
 
jwfirebird's Avatar
 
Join Date: Dec 2009
Location: western,ny state
Posts: 9,616
Thanked 563 Times in 481 Posts
jwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond reputejwfirebird has a reputation beyond repute
Default

sounds like the icm is the issue for the poor running to me. i dont really know whats best for your l67. i have used delco and delphi stuff for years but on plugs and wires i have had issues on the last couple sets i have bought for my bonnie and my previous monte carlo. now i normally get bosch single platinum plugs and bosch wires. but those are all NA vehicles and they have come with single platinum so thats what i put back. i still use delco sensors, cap, rotor, or that icm i would get delco. the icm on my bonnie is original and has over 200k
jwfirebird is offline   Reply With Quote
Old 07-15-2014, 01:44 PM   #14
Member
Posts like a V-Tak
Thread Starter
 
goeppngr's Avatar
 
Join Date: Mar 2005
Location: Milwaukee, WI
Posts: 59
Thanks: 0
Thanked 3 Times in 2 Posts
goeppngr is on a distinguished road
Default

Wanted to put some closure on this topic:

I received the ICM from RockAuto yesterday (United part information below, cost was $72.79):

"UNITED IGNITION WIRE Part # DCM9607 United Premium OEM replacement Control Module"

Running back to normal. As I go back on this I should have purchased the spark tester first before doing any fuel work (not a big deal, as I needed to replace fuel filter anyway). The $5 kept me from replacing the LIM gaskets (immediately anyway). For that, I can now watch the coolant more closely and decide when/if that still needs to be completed, again.

Thanks for all the input on resolving this issue.
goeppngr is offline   Reply With Quote
The Following 2 Users Say Thank You to goeppngr For This Useful Post:
jwfirebird (07-15-2014), Mike (07-15-2014)
Old 08-26-2014, 08:42 PM   #15
Member
Posts like a V-Tak
 
Join Date: Feb 2012
Location: mi
Posts: 69
Thanks: 0
Thanked 1 Time in 1 Post
kaptainkhaos is on a distinguished road
Default

having the same problem with my sons 2001 bonnie. all coils test good. new plugs and wires. still not burning all the fuel. will stop by harbor freight for spark tester. can you post a picture of spark tester please. thanks
kaptainkhaos is offline   Reply With Quote
Old 08-26-2014, 09:18 PM   #16
Senior Member
Posts like a Turbo
 
chevy82's Avatar
 
Join Date: Jan 2014
Location: Missouri
Posts: 396
Thanked 99 Times in 84 Posts
chevy82 is a glorious beacon of lightchevy82 is a glorious beacon of lightchevy82 is a glorious beacon of lightchevy82 is a glorious beacon of lightchevy82 is a glorious beacon of lightchevy82 is a glorious beacon of light
Default

chevy82 is offline   Reply With Quote
Old 08-26-2014, 09:57 PM   #17
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,150
Thanked 785 Times in 614 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

My fave:

Attached Thumbnails
Misfire Assistance (P0300)-kd2756.jpg  
Tech II is offline   Reply With Quote
Old 08-26-2014, 10:18 PM   #18
Senior Member
Posts like a Turbo
 
chevy82's Avatar
 
Join Date: Jan 2014
Location: Missouri
Posts: 396
Thanked 99 Times in 84 Posts
chevy82 is a glorious beacon of lightchevy82 is a glorious beacon of lightchevy82 is a glorious beacon of lightchevy82 is a glorious beacon of lightchevy82 is a glorious beacon of lightchevy82 is a glorious beacon of light
Default

Quote:
Originally Posted by Tech II View Post
My fave:

Not a big fan, With the other tester the bulb gives a good indication if a wire, cap or coil is breaking down while the engine is running. Ive had too many false readings with the one shown above. Case in point atv wouldn't start. My tester showed a very dim bulb while the other showed a fine spark. But everyone has their preference.

Last edited by chevy82; 08-26-2014 at 10:19 PM.
chevy82 is offline   Reply With Quote
Old 08-27-2014, 12:29 AM   #19
Member
Posts like a V-Tak
Thread Starter
 
goeppngr's Avatar
 
Join Date: Mar 2005
Location: Milwaukee, WI
Posts: 59
Thanks: 0
Thanked 3 Times in 2 Posts
goeppngr is on a distinguished road
Default

Quote:
Originally Posted by kaptainkhaos View Post
having the same problem with my sons 2001 bonnie. all coils test good. new plugs and wires. still not burning all the fuel. will stop by harbor freight for spark tester. can you post a picture of spark tester please. thanks
Here is a mobile link to the product (I just googled "harbor freight spark tester). Very easy to use, but no real directions. Simply unplug the wire from the plug, plug the spark tester on the plug (the only end that will fit) and the other end in the wire. Then start the car and inspect the light patterns. For me I had two cylinders not lighting at all.

Let me know if you need anything else.

http://m.harborfreight.com/inline-ignition-spark-checker-69014.html?utm_referrer=direct%2Fnot%20provided
goeppngr is offline   Reply With Quote
Old 08-27-2014, 11:20 AM   #20
Senior Member

Certified GM nut
 
Tech II's Avatar
 
Join Date: Feb 2014
Location: Worcester, Ma.
Posts: 2,150
Thanked 785 Times in 614 Posts
Tech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond reputeTech II has a reputation beyond repute
Default

The reason I like this one(there are two kinds, one with the center post and one without....for HEI, you want the one without.....) is the sound.....there is spark and there is spark.....there is a good healthy spark sound you want to hear....a weak sound or intermittent spark is not good....

I don't use this the conventional way......

I watched a Buick Know How once.....what they did was, similar to your tester.....they added an ignition wire and installed a bolt in the boot coil end of the wire( I have this setup with my tester, handy)......pull wire off the plug, and attach it to ST-125...take the other ignition wire, and attach it to the plug in the engine.....now attach the ST-125 alligator clip to the bolt in the end of the other ignition wire....you are now checking the weakness of that coil through the ST-125 plus the your engine plug gap, and you are not adding fuel to a cylinder that is not firing....

The only drawback to this tester? the spark.....do not let it spark near the battery......if the battery happens to be releasing excessive hydrogen gasses, KABOOM.......saw it happen to someone who didn't use the tester properly.....luckily he did not get hurt.....just lack of common sense.......
Tech II is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Impala Misfire P0300... more inside espee1989 Chevrolet 9 11-16-2011 01:22 PM
P0300 misfire help (fixed) midwboss Buick 13 10-20-2011 02:04 PM
2001 Chevy Blazer P0300 misfire wayneo28088 Chevrolet 2 09-07-2011 05:02 AM
p0300 Random/mult cylinder misfire (fixed) bonnie_99 1992-1999 16 05-08-2011 10:55 PM
DTC P0300 Engine Misfire Detected Wargamer 1992-1999 26 05-01-2005 02:57 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 06:36 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.