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Engine has low vacuum

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Old 10-22-2003, 07:51 AM   #1
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Default Engine has low vacuum

My engine has low vacuum, how can I fix it?
Setup: B18b with Crower 404 cams, JG/Edelbrock intake manifold, Holley T/B
Je pistons, Eagle Rods, Crower Valvetrain, etc.
Thanks for any feedback.
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Old 10-22-2003, 10:05 AM   #2
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Default Re: Engine has low vacuum (whatVTEC)

^bump^
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Old 10-22-2003, 10:28 AM   #3
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Default Re: Engine has low vacuum (whatVTEC)

whats the vaccum at?if its just a little low its ok cause of the cams
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Old 10-22-2003, 11:22 AM   #4
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Default Re: Engine has low vacuum (mmuller)

I don't remember what it was, but I had a technician at my work look at it and he said he was surprised it was even running. My car doesn't idle for ****. I don't know if it's related to the low vacuum.
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Old 10-22-2003, 11:33 AM   #5
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Default Re: Engine has low vacuum (whatVTEC)

idle like?
those cams are pretty big so it will have a lumpy idle and vaccum its gonna be low at idle.
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Old 10-22-2003, 11:37 AM   #6
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Default Re: Engine has low vacuum (whatVTEC)

has the engine ever ran with the propervacum? usually low vacuum at idle is caused by severly retarded ign timing or cam timing
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Old 10-22-2003, 12:09 PM   #7
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Default Re: Engine has low vacuum (JDogg)

its called bigger cams.........they dont produce a good vacuum signal.......same goes with my big block chevy.......i have a lopey cam and it only makes like 5inches of vacuum...........
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Old 10-22-2003, 01:25 PM   #8
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Default Re: Engine has low vacuum (rsbad454)

Well when the car wants to idle it's lumpy which is normal. But the car very rarely idles. The timing stock. It's not advanced or retarded. Is there something I could add to make more vacuum?
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Old 10-22-2003, 02:46 PM   #9
 
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Default Re: Engine has low vacuum (whatVTEC)

how do u tell if ur car is making low vacuum?
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Old 10-22-2003, 03:42 PM   #10
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Default Re: Engine has low vacuum (WuRKD b16)

Hooked it up to a vacuum gauge
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Old 10-22-2003, 06:14 PM   #11
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Default Re: Engine has low vacuum (whatVTEC)

you could make it have more vaccum by putting the stock cams back on
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Old 10-23-2003, 03:01 AM   #12
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Default Re: Engine has low vacuum (whatVTEC)

your running 404 cams and want vacuum??????

"Stage 3 - 3/4 Race, recommended for mostly strip. Requires 84162 kit and ECU mod. 1100 to 8200+ rpm, lope at idle."

3/4 RACE??? Who here knows THAT terminology??????
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Old 10-23-2003, 05:10 AM   #13
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Default Re: Engine has low vacuum (Mista Bone)

you wont make more vacuum unless you install stock cams........you can save vacuum with a resevoir like used for V8 street machines with power brakes. Yes, ECU's usually like to see a better chip to run with the bigger cams. these arent like the 2 in 1 cams for Vtec motors with small and bif lobes......only thing i can suggest is to increase the idle with the screw. Call the cam manufacturer and see if these are suppose to cause this type od idle.
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Old 10-23-2003, 06:59 AM   #14
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Default Re: Engine has low vacuum (Mista Bone)

The thing is that I was under the impression that my car would still idle with these cams...just lumpy. But my car don't idle at all.
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Old 10-23-2003, 09:06 AM   #15
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Default Re: Engine has low vacuum (whatVTEC)

well then you need to check for vacuum leaks, and do you have cels?
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Old 10-23-2003, 12:30 PM   #16
 
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Default Re: Engine has low vacuum (whatVTEC)

Quote:
Originally Posted by whatVTEC
The thing is that I was under the impression that my car would still idle with these cams...just lumpy. But my car don't idle at all.
'idle' is relative - crank it up. probably won't smooth out until the advance catches up a bit and you've got some vacuum (12-1300 rpms). ought to be real nice at the other end.
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Old 10-23-2003, 03:14 PM   #17
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Default Re: Engine has low vacuum (rsbad454)

I know I gotta vacuum leak somewhere which isn't helping, but there is no CEL
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