over fueling - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
LinkBack Thread Tools Display Modes
post #1 of 13 (permalink) Old Apr 5th, 09, 12:41 PM Thread Starter
 
Join Date: Apr 2009
Posts: 14
Smile over fueling

i have a 91 rs 305 that starts and runs fine till it gets warm then it floods and stops. if i pull the wires off the 2 injectors it will run ok for a while. any help with thanks
paradox2012 is offline  
Sponsored Links
Advertisement
 
post #2 of 13 (permalink) Old Apr 6th, 09, 12:07 PM Thread Starter
 
Join Date: Apr 2009
Posts: 14
Re: over fueling

could this just be a sensor problem??
paradox2012 is offline  
post #3 of 13 (permalink) Old Apr 6th, 09, 12:11 PM
Gold Lifetime Member
John
 
Join Date: Dec 2008
Location: Louisville, Ky.
Posts: 3,403
Re: over fueling

My first guess is the temperature sending unit, front of intake near theromostat?
john68 is offline  
 
post #4 of 13 (permalink) Old Apr 6th, 09, 06:58 PM
Senior Tech
 
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277
Re: over fueling

An important thing to consider is whether or not the engine is running in open or closed loop mode. When the engine is cold, the ECM sends a pre-programmed amount of fuel to the injectors. Once the engine is warmed up, it switches to closed loop mode and begins monitoring the O2 sensors to set the mixture. First step is to get the codes out of your computer. After having pulled two injectors though, you may have to clear the codes first and then get to misbehave to get a good read on them.

Dave
========================
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
dnult is offline  
post #5 of 13 (permalink) Old Apr 6th, 09, 08:47 PM
Senior Tech
Alan
 
Join Date: Oct 2007
Location: SoCal
Posts: 3,903
Re: over fueling

I think John and Dave are both onto something. If the temp sensor is faulty and the ECU thinks the engine is cold, it will always run rich. Typically, you should be able to test the temp sensor with a DVM. When the engine is cold, you would get one ohm range reading and when the engine is hot, the sensor will read a different range of ohms. If you are getting the same readings hot or cold, you have a bad sensor.

alan
alanrw is offline  
post #6 of 13 (permalink) Old Apr 7th, 09, 12:41 PM Thread Starter
 
Join Date: Apr 2009
Posts: 14
Re: over fueling

many thanks for your help chaps! as the radio i have in the car discharges the battery i disconect it so i guess i have lost any codes. i am now going to run it up till it faults again and try for codes.
paradox2012 is offline  
post #7 of 13 (permalink) Old Apr 8th, 09, 02:09 PM Thread Starter
 
Join Date: Apr 2009
Posts: 14
Re: over fueling

right she still runs fine for about 5 or so mins then both injectors go crazy. have checked codes and got 15 and 23 out of it. the cat was removed sometime ago before i got the car. help?
paradox2012 is offline  
post #8 of 13 (permalink) Old Apr 8th, 09, 02:55 PM Thread Starter
 
Join Date: Apr 2009
Posts: 14
Re: over fueling

oh yeh the cat was taken off and i cant see a oxygen sensor, think i have found the wire where it should be. has been that way for the year and half that i have had the car tho.
paradox2012 is offline  
post #9 of 13 (permalink) Old Apr 9th, 09, 12:06 PM Thread Starter
 
Join Date: Apr 2009
Posts: 14
Re: over fueling

new temp sender should be here sat
paradox2012 is offline  
post #10 of 13 (permalink) Old Apr 9th, 09, 03:42 PM
Senior Tech
Alan
 
Join Date: Oct 2007
Location: SoCal
Posts: 3,903
Re: over fueling

Did you test the old one?

alan
alanrw is offline  
post #11 of 13 (permalink) Old Apr 9th, 09, 07:55 PM
 
Join Date: Apr 2009
Posts: 9
Re: over fueling

i have a 92 and its doin the same thing. it ran great after tune up and then it all went to hell. its now just pouring full throttle at start and bogs the motor out. it barely runs. i pulled the tbi off and cleaned it that should do it. has the car been sittin??
chevyhead420 is offline  
post #12 of 13 (permalink) Old Apr 10th, 09, 12:36 AM Thread Starter
 
Join Date: Apr 2009
Posts: 14
Re: over fueling

na i didnt test it alan as i have no multi meter, should get one i guess. did get code 15 out the ecu tho. cheveyhead, yeh has been stood up for the winter with the odd start now and then.
paradox2012 is offline  
post #13 of 13 (permalink) Old Apr 11th, 09, 11:58 PM Thread Starter
 
Join Date: Apr 2009
Posts: 14
Re: over fueling

hey! she is sorted. runs best she ever has and i have the service light off now to. i guess the sensor was faulty all the time i have had the car. thanks for the help guys! poasted the same things on a uk forum and not a single message back. THANKS!
paradox2012 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Team Camaro Tech forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address.
NOTE we receive a lot of registrations with bad email addresses. IF you do not receive your confirmation email you will not be able to post. contact support and we will try and help.
Be sure you enter a valid email address and check your spam folder as well.



Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 On

 
For the best viewing experience please update your browser to Google Chrome