Still no boost. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 10-21-2004, 02:23 PM   #1
Senior Member
Posts like a Supercharger
Thread Starter
 
Join Date: Mar 2004
Location: Monroe Michigan
Posts: 199
Thanks: 0
Thanked 0 Times in 0 Posts
Jagman04 is on a distinguished road
Default Still no boost.

Well i got my new BCS in the mail today and i went outside put er on and started it up. Still only get 2 lbs of boost, to begin with i had a code 26 41 and 56 being QBDM2, Cam sensor, and BCS. Now im getting a code 55 which shows as a ECM problem in there also. Now im a little confused on one part of techinfo a code 56 is a boost control problem, and 55 is the ECM, now on another part of it for the same gen and year it says 55 is a EGR solenoid fault and that 56 is quad driver b and 57 is the boost problem?!?! techinfo is a little confusing on these matters, now i dont know why i dont have boost anymore, cam sensor is in the mail and should be here tomorrow, but what is the proper code for my problems?

UPDATE: I have an extra ECM so i changed that out and i still have 26, 41 and 56 but theres no 55 anymore..??
Jagman04 is offline   Reply With Quote
Old 10-22-2004, 02:24 PM   #2
Senior Member
Posts like a Supercharger
Thread Starter
 
Join Date: Mar 2004
Location: Monroe Michigan
Posts: 199
Thanks: 0
Thanked 0 Times in 0 Posts
Jagman04 is on a distinguished road
Default

Anyone have any thoughts? i got the cam sensor today and tomorrow or monday im gonna put it on or try to atleast...
Jagman04 is offline   Reply With Quote
Old 10-22-2004, 02:34 PM   #3
Senior Member
True Car Nut
 
Join Date: Sep 2004
Location: Farmington, Minnesota =MWBF '05 SURVIVOR= =CEBF '06 SURVIVOR= =August '06 COTM=
Posts: 9,130
Thanks: 0
Thanked 0 Times in 0 Posts
LakevilleSSEi is on a distinguished road
Default

I don't think that the cam and crank sensor would have any effect on boost...but I could be wrong....Has happened many times before......What are the description of the codes that you are recieving out of the ECM? I thought that the only problem that arose out of the crank and cam sensors was no start conditions because those two sensors control the timing of the motor. The ECM u swapped, was that one with a factory chip or did you swap your thero runner chip also? The quad driver B I believe is related to the trans shift solenoids and something else. Get a chiltons or haynes maual and they can tell you how to troubleshoot the EGR valve and solenoid.
LakevilleSSEi is offline   Reply With Quote
Old 10-22-2004, 02:47 PM   #4
Senior Member
Posts like a Supercharger
Thread Starter
 
Join Date: Mar 2004
Location: Monroe Michigan
Posts: 199
Thanks: 0
Thanked 0 Times in 0 Posts
Jagman04 is on a distinguished road
Default

The codes are
code 26: Quad driver module "A" Circuit
code 41: Cam sensor circuit loss of signal
code 56: Boost control solenoid or (56 - Quad-Driver " B " Fault ) depends on which tech info

Now someone told me that a broken cam sensor pulls timing and makes the computer dump boost?? Im thinking that since i already have quad "A" that the 56 isnt a boost control problem and is really a quad driver "B"? Well im changing the cam sensor soon as i have some free time, if anyone has some advice about the codes and what i should do let me know
Jagman04 is offline   Reply With Quote
Old 10-25-2004, 06:54 PM   #5
Senior Member
Posts like a Supercharger
Thread Starter
 
Join Date: Mar 2004
Location: Monroe Michigan
Posts: 199
Thanks: 0
Thanked 0 Times in 0 Posts
Jagman04 is on a distinguished road
Default

Well i changed the cam sensor but i still have the code so im going to assume that its the magnet or wiring, my dad has the tools but i dont have the time to be messing around so im just going to take it in to the shop and have them deal with it. Also today i rotated tires, finished my box for my CAI (looks like crap), and changed my O2 sensor. Next week is cleaning the TB (where do i get gaskets?)
Jagman04 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Low boost, no boost problem immusicman Forced Induction 12 09-27-2009 01:05 AM
Boost Control Solenoid Maintenance and Boost Control Actuator Test for low Boost* Toddster Trouble shooting + Test Procedures 0 03-21-2009 07:24 PM
More boost via boost controller... DanCulkin Performance, Brainstorming & Tuning 14 07-02-2007 12:02 PM
low stock Boost vs high stock boost hvactech Performance, Brainstorming & Tuning 12 05-10-2005 11:14 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 04:22 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.