i think i'm getting too much boost - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

Reply
 
 
 
Thread Tools Search this Thread
Old 08-31-2007, 07:46 PM   #1
Junior Member
Thread Starter
 
Join Date: Aug 2007
Location: nj
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
gesandow is on a distinguished road
Default i think i'm getting too much boost

Hi. New here. I have a '94 SSEi that I got at 100k miles, now at 142k. It seems from what I have read that I am getting too much boost. The gauge reads +1 or so at idle +2 with a/c on. It jumps to 5 or more when i touch the gas, and it maxes out at 1/2 throttle or so. At idle, the rod in the BCA is almost fully extended, down by the supercharger bolt. Removing the top vac hose extends it just a bit more. removing the bottom brings it all the way up. In either position, I see no change in the boost reading at the gauge. Could this be the BCS?
I also have a SES light, only once the engine is hot and when I let off of the gas. Once on, it stays on, with a p1640 code, or so I'm told. (don't know if the boost is related to the light but it might be a clue).
gesandow is offline   Reply With Quote
Old 08-31-2007, 11:58 PM   #2
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

If removing the bottom makes the rod go all the way up, the BCS is bad. It'* fairly cheap and easy to replace. The fact that the boost needle responds to throttle input, means the MAP is working, but maybe not properly. If you turn the car on, but don't start the engine, where does the boost needle settle?
J Wikoff is offline   Reply With Quote
Old 09-01-2007, 04:58 PM   #3
Junior Member
Thread Starter
 
Join Date: Aug 2007
Location: nj
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
gesandow is on a distinguished road
Default

Thanks for the reply. It settles at +10 with the ignition on, engine off. As for the BCS, will I have to go to a dealer to buy one? Or will any auto parts store have one?
gesandow is offline   Reply With Quote
Old 09-01-2007, 06:35 PM   #4
Senior Member
Certified Car Nut
 
Join Date: Mar 2003
Posts: 12,432
Thanks: 0
Thanked 0 Times in 0 Posts
J Wikoff is on a distinguished road
Default

I can't remember if parts stores will have the BCS. And if your boost needle settles at +10, you need a new MAP sensor, most likely. It should settle at or near 0.
J Wikoff is offline   Reply With Quote
Old 09-01-2007, 09:05 PM   #5
Junior Member
Thread Starter
 
Join Date: Aug 2007
Location: nj
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
gesandow is on a distinguished road
Default

Thanks a bunch. Very helpful.
gesandow is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
How Much Is Too Much? NCCamper General GM Chat 8 05-08-2006 04:38 PM
How much oil consumption is too much? robb 2000-2005 15 07-30-2005 03:59 AM
How much is too much... J Wikoff Forced Induction 3 04-27-2005 12:20 AM
Star Wars + Too Much Time + Too Much Money = ??? mremer Lounge 7 03-10-2004 01:54 AM
how much is too much? buickman401 Performance, Brainstorming & Tuning 9 05-06-2003 12:36 AM


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 11:10 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.