split blms - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Pontiac When starting new posts, please specify YEAR, MAKE, MODEL, ENGINE type, and whatever modifications you have made.

Reply
 
 
 
Thread Tools Search this Thread
Old 09-05-2013, 03:04 AM   #1
Junior Member
Thread Starter
 
Join Date: Sep 2013
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
slaytonic is on a distinguished road
Default split blms

on my 95 firebird with the stock 3.4l what would cause split blms? as in left bank 128 right bank 105 in cell 16(idle).two brand new 02 sensors ,new plugs and wires, no error codes (i am using tunerpro rt). injectors not leaking. what should i be looking at to fix this? cant pass emissions nox over double the standard in az.
slaytonic is offline   Reply With Quote
Old 09-05-2013, 03:28 AM   #2
Senior Member

Posts like a Camaro
 
Join Date: Aug 2013
Location: Northern California
Posts: 1,014
Thanked 164 Times in 130 Posts
75 racer is a splendid one to behold75 racer is a splendid one to behold75 racer is a splendid one to behold75 racer is a splendid one to behold75 racer is a splendid one to behold75 racer is a splendid one to behold75 racer is a splendid one to behold
Default

Could be a blown diaphragm on the fuel pressure regulator causing raw fuel to be sucked into the intake through the vacuum line.
75 racer is offline   Reply With Quote
Old 09-06-2013, 04:45 AM   #3
Junior Member
Thread Starter
 
Join Date: Sep 2013
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
slaytonic is on a distinguished road
Default

the problem is on one side and the fuel pressure regulator would effect both sides i believe. i could be wrong on that. fuel pressure at the fuel rail was good. is there a way to test the fuel regulator?
slaytonic is offline   Reply With Quote
Old 09-06-2013, 04:48 AM   #4
Junior Member
Thread Starter
 
Join Date: Sep 2013
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
slaytonic is on a distinguished road
Default

also when i pulled the vacuum line there was no gas present.
slaytonic is offline   Reply With Quote
Old 09-06-2013, 11:10 AM   #5
Senior Member
True Car Nut
 
rjolly87's Avatar
 
Join Date: Jun 2003
Location: Las Cruces, NM
Posts: 6,857
Thanked 298 Times in 246 Posts
rjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant futurerjolly87 has a brilliant future
Default

After some interwebbing, I found this info, which gives me a bit of an idea:

Quote:
What Causes High NO - Nitrous Oxide - SmogTips.com. Why did my car fail emission test high NO emissions. What is NO. My vehicle failed high nitrous oxide emissions test. Produced high NO. Common high NO failures. NO emissions. How can I lower NOx. Co

WHAT CAUSES HIGH NO?

Nitrous Oxide or NO is created when an engine'* combustion chamber temperature reaches over 2500F. Vehicle manufacturers have designed several systems, which when working properly, lower nitrous oxide emissions. Below are common failures which may cause your car, truck, van, suv, or motorhome to produce high high nitrous oxide.
Causes go on to include running lean, egr issues, carbon buildup, and overheating.

You have indicated the computer is accounting for something, pulling more fuel to one side. That may be the indication you are looking for. Sometimes if injectors aren't flowing right, clogged, etc, it can cause this issue. It also indicates carbon buildup as well could cause this. If an injector is clogged, you will have one lean cylinder, and 2 rich cylinders, which will wreak havoc on emissions.

When was the last time you were on carbon patrol? I am thinking a good engine/fuel system cleaner (seafoam or techron) is in order, along with some spirited driving. If the issue persists, I would swap injectors from one side to another to see if the problem moves. Also look for vacuum leaks as well. Dryrotted vacuum lines are a possibility too.
rjolly87 is online now   Reply With Quote
Old 09-07-2013, 11:33 AM   #6
Junior Member
Thread Starter
 
Join Date: Sep 2013
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
slaytonic is on a distinguished road
Default

I have tried swapping injectors and no change, as for carbon and such i completed a valve job not to long ago and its clean inside. i think i found a spark plug that looked odd and will be trying out new ones today. ill let you know if that was the problem. if the plug wasn't firing then that would explain all the extra fuel going thru the cat. i think anyways.
slaytonic is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
SSEI split 3 spoke Rim pics....JUST THE RIM Findlay GTP General GM Chat 14 01-31-2004 01:17 AM
EGR in a 92? (split from another topic by admin) BonneMeMN 1992-1999 7 07-04-2003 02:44 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 09:20 PM.


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.