Random Misfire p0300 HELP - Camaro Zone - Camaro Forums and News

Go Back   Camaro Zone - Camaro Forums and News > Camaro & Firebird Tech Forums > 4th Gen (1998-02) Camaro and Firebird Tech

Join Camaro Zone Today
Reply
 
LinkBack Thread Tools
 
Old 09-17-2011, 11:55 AM   #1
New Member
Feedback Score: 0 reviews
 
Join Date: Sep 2011
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Question Random Misfire p0300 HELP

2000 chevy Camaro 3.8 engine. Have had a random misfire code for months, but smog is coming up now no one can figure out how the hell to fix this thing.
I have changed, spark plugs, wires, coils. I bought a new ICM from auto zone and put in it there, and changed all 3 02 sensors. Even put the fuel cleaner in the gas.
Nothing happened, car has to be driven about 40miles before that CEL comes back on. Run the code reader, comes up with p0300.
Car was taken to a shop, they replaced the fuel filter, nothing. They wrote “misfire 65mph under load 180 degrees.”
They also put in a new cam sensor and road tested the car but the light came back on so they put the old cam senor back on.
Took the car to a different shop they did a fuel injector flush. Light came back on after being driven.
After that the guy scanned the code on the computer and found that it was cylinders #1 and #6 misfire. He then did a compression test on 1,3,6. #1=125psi, #3=140psi, #6=140psi.
I am at a loose with this car, the second shop told me that he really has no idea were to go from here, that there is nothing mechanically causing the misfire that he can see. he told me to take it to a chevy dealer to have them diagnose it.
If you have any input on what the hell could be going on I would really appreciate it.
Help me please…. Thank you.
__________________

__________________
knscharf is offline   Reply With Quote
Old 09-17-2011, 01:42 PM   #2
The "Senior" Member
Feedback Score: 1 reviews
 
NavyVet's Avatar
 
Join Date: Jan 2010
Location: Jacksonville, FL
Posts: 15,504
Thanks: 36
Thanked 967 Times in 870 Posts
Garage
Do a fuel pressure test with a direct reading gauge attached to the test port.
Get a gauge with a long enough hose so you can tape the gauge to the windshield and watch it while driving.
Also, pull the vacuum hose off of the fuel pressure regulator and see if it has fuel in it.
If it does, the regulator has failed.
__________________

96 T/A, Black/Graphite Leather, T-Tops, 6 speed, 10 speaker Delco/Bose "Monsoon"
Original owner, 191k miles and counting.
Total engine rebuild at 187,020 miles.
AIR delete. Bored .030 over.
Comp cams Xtreme Energy LT1 266HR-14 street cam and springs..
NavyVet is offline   Reply With Quote
Reply

Thread Tools

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 On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
The dreaded P0300 code CincyBird98 V6 Camaro and Firebird Tech 4 07-06-2011 11:17 AM
p0300 and many others!!!! DecencyxDefied 4th Gen (1998-02) Camaro and Firebird Tech 9 01-22-2011 10:12 PM
P0300 77k5 4th Gen (1993-97) Camaro and Firebird Tech 5 05-22-2010 10:23 PM
2001 3.8L Firebird... Random Misfire mechanic98 V6 Camaro and Firebird Tech 0 10-12-2008 11:34 PM
Optispark/timing/p0300 ccanterb 4th Gen (1993-97) Camaro and Firebird Tech 3 01-28-2008 11:25 AM




Powered by vBadvanced CMPS v3.2.3

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

RV & Travel Trailer Communities

Our RV & Travel Trailer sites encompasses virtually all types of Recreational Vehicles, from brand-specific to general RV communities.

» More about our RV Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities


Copyright 2002-2012 Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 06:20 AM.
Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.6.0
Copyright © CamaroZone.com

Camaro News Delivered to your Email!

Get the latest Camaro news straight to your inbox!

unsusbcribe at anytime with one click

Close [X]