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-   -   boost issue (https://www.rx7club.com/3rd-generation-specific-1993-2002-16/boost-issue-790334/)

Sideo Sep 29, 2008 12:31 PM

boost issue
 
The car was running great, cold night, was creeping up to 13 psi. I have 850 primaries so it wasnt a problem. The car was pretty hot so i let it idle in front of a fan after we were done driving. The next morning i am now only hitting 5 psi. I tried doing a pressure test but i think i am doing it wrong. I clamped a capped pipe with a valve stem into the TB elbow and filled it with air, it sounded like it was all coming out of the air filters, do i need to cap them also. all the couplers seem tight, cannot find any loose vacuum hoses.

BOOSTscoop Sep 29, 2008 12:34 PM

how long did you let it warm up for?

Sideo Sep 29, 2008 12:35 PM

when i did the pressure test? i drove from my house to the gas station to use their air, probably 2 or 3 miles.

BOOSTscoop Sep 29, 2008 12:39 PM

my car is doing the same thing..... pretty much the exact same thing

other shit too.. =[

Sideo Sep 29, 2008 12:41 PM

what else is it doing? If i find anything out ill let you know.

BOOSTscoop Sep 29, 2008 12:44 PM

the low coolant light goes off randomly, and quite frequently. and my water temp spikes and drops (from 50% - 75% then back down) it doesnt gradually go up or down just jumps. and also as of the other day my idle spikes up and down to between 1.5 and 2.7k

ToMaC Sep 30, 2008 01:15 AM


Originally Posted by Sideo (Post 8594782)
The car was running great, cold night, was creeping up to 13 psi. I have 850 primaries so it wasnt a problem. The car was pretty hot so i let it idle in front of a fan after we were done driving. The next morning i am now only hitting 5 psi. I tried doing a pressure test but i think i am doing it wrong. I clamped a capped pipe with a valve stem into the TB elbow and filled it with air, it sounded like it was all coming out of the air filters, do i need to cap them also. all the couplers seem tight, cannot find any loose vacuum hoses.

5 psi throughout the power band? Your sig says you have a cracked apex seal? What's that all about? Are you driving it knowing one of your seals are damaged?


Originally Posted by BOOSTscoop (Post 8594819)
the low coolant light goes off randomly, and quite frequently. and my water temp spikes and drops (from 50% - 75% then back down) it doesnt gradually go up or down just jumps. and also as of the other day my idle spikes up and down to between 1.5 and 2.7k

Do a champagne test, sounds like you have exhaust gasses in your coolant.

parid Sep 30, 2008 06:46 PM

Do you have a real water temp gauge or are you just reading off the stock gauge (that is nearly useless)?

Sideo Sep 30, 2008 07:59 PM

i havnt updated my sig yet, i rebuilt teh engine have around 1k miles on it so far. 5-4-5 boost pattern sometimes hit 6 or 7 psi if its cold


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