hay guys... i got no boost after the car reaches temp.... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-21-2007, 12:23 AM   #1
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Default hay guys... i got no boost after the car reaches temp....

well jsut like it says ...no boost after temp is reached...then my engine light comes on.....

i check the code and it came up 56... witch is a vacuum issue it think?

what i dont know is why i would have boost for quite some time and then it just seem to stop....do you think something is over heating?

i picked up a 180 thermostat just for fun....in hopes that it will do some good
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Old 09-21-2007, 12:27 AM   #2
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Please post your year and trim level in your signature, otherwise we have no idea what we are dealing with.

What octane gas are you using?
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Old 09-21-2007, 12:46 AM   #3
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93 SSEI SC....sorry...lol
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Old 09-21-2007, 08:14 AM   #4
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I'm leaning toward the Quad B fault that you mentioned in your other thread.

It probably is a BCS, however by removing one of the vac hoses (I don't remember which..I think the one on the BCS you will put yourself into full boost. This is bad as it won't allow your car to dump boost between shifts etc. Don't leave it like this for any longer than needed for testing.
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Old 09-21-2007, 10:24 AM   #5
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ok...should i do it until i reach temp...and should i do this be for i put in the new thermostat?

i will try to check other posts to see what hose it is....
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Old 09-21-2007, 10:54 AM   #6
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Up to temp and thermostat have no bearing on this.
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Old 09-22-2007, 08:33 AM   #7
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i did find another post about this topic but i did notice something different in the pic...there is a terminal near the BCS that has 2 vacuum hoses hooked up to it...well i have three...can you give me a link to another post that has the BCS Test but form my 93'

i will keep looking ..thanks for you help
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Old 09-22-2007, 12:14 PM   #8
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Link us to the one you found.
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Old 09-22-2007, 01:01 PM   #9
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sure this was it...i think i can still use it but i just want to make sure.....


http://www.bonnevilleclub.com/forum/...ic.php?t=84983
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Old 09-22-2007, 01:38 PM   #10
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Same procedure. It'* the elbow you're after.

Do NOT run like that long-term. I suspect your PCM is pulling boost to protect itself for some reason.

I'd like you to compare resistance between both of your ECT'* for starters. After that, warm the car up until the problem starts, keep it running, and spray carb cleaner lightly on all vacuum connections, and around the base of the supercharger. If the idle changes, you have a boost/vacuum leak.
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