Idle vacuum pressure
- Thread starter smagnotta
- Start date
Thats on the low side of normal IIRC. It might be more accurate to get a mechanical vacuum guage thats more accurate to check for sipping or spiking... that will tell you if there is a problem with many things. http://cygnusx1.net/supra/techtips.html go to the vacuum reading thing and it talks all about this.
I thought I should be around 20. Oh well at least it is steady at 16.5 and does not fluctuate. Looks like I need to see if the valve timing and ignition timing are OK. The car has 121,000 miles and the timing belt was changed by the previous owner at 75,000 miles. Maybe I will replace that too since I am in there checking the timing...
I have taken this car apart so many times...
I have taken this car apart so many times...
smagnotta said:I thought I should be around 20. Oh well at least it is steady at 16.5 and does not fluctuate. Looks like I need to see if the valve timing and ignition timing are OK. The car has 121,000 miles and the timing belt was changed by the previous owner at 75,000 miles. Maybe I will replace that too since I am in there checking the timing...
I have taken this car apart so many times...
16 isnt that bad...do you ever look at it after you drive for a bit? mine is usually around 15-17 until it warms up and then it idles around 20-22...
timing could cause a low vacuum but 16 isnt that bad really...
On my N/A the ilde vacuum pressure was around 20-25 in/Hg IIRC. I'm not sure what units you are looking for, but that can be converted. I always wondered why Autometer used inches of mercury instead of mm/Hg or P.S.I...
-Nick
-Nick
what, knowing that metric vaccum readings arent important???
no one else mentioned that average vaccum is 500mm/hg. i figured thats useful information for those of us running a Metric boost guage... like anyone w/ a Defi, HKS or GReddy... you know.
no one else mentioned that average vaccum is 500mm/hg. i figured thats useful information for those of us running a Metric boost guage... like anyone w/ a Defi, HKS or GReddy... you know.
flubyux2 said:
I don't think he knew you were being serious, he probably thought you were trying to be funny or something...
lol. cmon guys, i always try to be funny!
i typically dont postwhore to post whore... i make ita point to say something constructive even if the main basis of my reply is off-topic... like when i make fun of Jayson for being jewish or something like that.
but anyways, 500mm/hg is about average for good vaccuum. alot of times, it can fluctuate either way by 50mm/hg depending on idle speed, isc steppery or timing.
i typically dont postwhore to post whore... i make ita point to say something constructive even if the main basis of my reply is off-topic... like when i make fun of Jayson for being jewish or something like that.
but anyways, 500mm/hg is about average for good vaccuum. alot of times, it can fluctuate either way by 50mm/hg depending on idle speed, isc steppery or timing.