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.

2001 Bonneville supercharger boost problems. HELP!

Thread Tools
 
Search this Thread
 
Old 11-17-2013, 01:37 PM
  #1  
Junior Member
Thread Starter
 
Rcassetty77's Avatar
 
Join Date: Nov 2013
Location: Flint, Mi
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Rcassetty77 is on a distinguished road
Default 2001 Bonneville supercharger boost problems. HELP!

2001 Bonneville supercharger boost problems. HELP!-img_20131117_132813.jpg

As you may or may not see (in case I uploaded it wrong) that my boost gauge is reading at almost 0 at idle. It also buries itself when accelerating. If I don't let off immediately the motor feels like it'* misfiring and the SES light starts flashing. This is the only time I get any kind of misfire. The motor runs great the rest of the time. I've fixed vacuum leaks, changed plugs and wires, had cat converter checked out, changed front O2 sensor, all with no change. I can't find anything online related to this specific problem. Someone please help!
Old 11-17-2013, 06:06 PM
  #2  
Retired



Certified Car Nut
 
Mike's Avatar
 
Join Date: Jul 2003
Location: Dark Side, AZ
Posts: 17,920
Received 1,780 Likes on 1,304 Posts
Mike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond reputeMike has a reputation beyond repute
Default

Yea, if the check engine light is flashing and you got the pedal buried, get out of it. The PCM is probably seeing KR(knock, so its retarding your ignition) which is a really bad thing.

I'm not familiar with the stock boost gauges on these cars. But the most you should see is around 6-8psi at full load with a stock engine. 0 to -10 at idle is normal for an engine. I'm wondering if you have a bad MAP sensor.

If you can, please get your car scanned for any codes, this will help diagnose your issue.

Moved to 2000-2005 section for better visibility.
__________________
Retired Administrator
2002 *-10 5.7 V8
2023 Jeep Rubicon Diesel

Old 11-17-2013, 07:42 PM
  #3  
Junior Member
Thread Starter
 
Rcassetty77's Avatar
 
Join Date: Nov 2013
Location: Flint, Mi
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Rcassetty77 is on a distinguished road
Default

It'* not the accelerator that'* buried it'* the boost gauge. As soon as it gets close to the yellow line i let off. I was just trying explain the situation. The service engine light only flashed on one occasion when it down shifted into the passing gear. It'* frustrating cause the car runs great except for this. Someone else suggested the map sensor as well. I'll try it. Appreciate the help and will post the results
Old 11-17-2013, 09:06 PM
  #4  
Senior Member
True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,816
Received 241 Likes on 198 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

Check that the boost solenoid is working, and the activation arm is retracting and extending completely. With the engine running and in park observe the position of the rod that comes out of the BCS. Pull the vacuum line off (plug the end with your finger) and see how the BCS arm reacts.

I just want to determine if the BCS is moving freely, or stuck in the full boost position.
Old 11-18-2013, 07:50 AM
  #5  
Junior Member
Thread Starter
 
Rcassetty77's Avatar
 
Join Date: Nov 2013
Location: Flint, Mi
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Rcassetty77 is on a distinguished road
Default

Ok, i will check the bcm arm. I have had the car scanned. I have a matco scanner. I'm not showing any codes except for the rf wheel speed sensor that i changed the wheel bearing on yesterday but it must be something in the wire. I don't have a service light on either. If the map sensor was bad wouldn't it throw a code? Idk. I'll the solenoid as well.
Old 11-18-2013, 03:40 PM
  #6  
Junior Member
Thread Starter
 
Rcassetty77's Avatar
 
Join Date: Nov 2013
Location: Flint, Mi
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Rcassetty77 is on a distinguished road
Default

Ok, when i pull the bottom vacuum line off and stick my finger on the bcs and plug the hole with my finger it does nothing. When i pull the top hose of it drops slowly to the hard stop. Idk if that'* good or bad. The arm itself is not stuck.
Old 11-19-2013, 11:45 AM
  #7  
Senior Member
True Car Nut
 
2kg4u's Avatar
 
Join Date: Sep 2006
Location: Windsor, Ontario / Detroit, Michigan
Posts: 4,816
Received 241 Likes on 198 Posts
2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of2kg4u has much to be proud of
Default

When the car is not running, the arm on the boost control actuator should be fully extended. When you start the car, the arm "pulls up" into the actuator. Under WOT the arm will again extend (to the position it is in when the car is not running) to open the */C gate valve. In other words, when the arm is retracted into the actuator you have no boost. When the arm is extended out of the actuator you have full boost. High vacuum (idle) no boost, low vacuum (engine off, or WOT) full boost.

If the arm extends when you unplug the vacuum lines it is operating as intended.

Have you scanned for trouble codes?
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
immusicman
Forced Induction
12
09-27-2009 12:05 AM
Toddster
Trouble shooting + Test Procedures
0
03-21-2009 06:24 PM
DanCulkin
Performance, Brainstorming & Tuning
14
07-02-2007 11:02 AM
Boombata
Performance, Brainstorming & Tuning
10
10-10-2005 03:55 PM
hvactech
Performance, Brainstorming & Tuning
12
05-10-2005 10:14 PM



Quick Reply: 2001 Bonneville supercharger boost problems. HELP!



All times are GMT -4. The time now is 02:35 AM.