I just got done finishing a bhg, tune up ,and new turbo. The car idles around 600 and runs fine, but im not getting any boost and it feels like a N/A.
New turbo , but not boost
- Thread starter red90turbo
- Start date
On the boost gauge it shows 0psi when idling and when i start to go it drops down -4psi and then goes back up to 0psi. I havent put more than 5 miles on the car and i didnt want to push it too far. I havent had time to check engine codes so far but i will this weekend.
red90turbo;1665482 said:
?? 0 @ idle, should be -17 to 22 in hg... OH wait you are still just using stock gauge, is that correct? Still I do not think it should read zero at idle... Have you checked vacuum with a tester gauge both at the boost gauge sensor and at the plenum? Do you have any kind of boost controller connected or are you using WG spring pressure only?
You should have 17-22HG for your vaccum reading at idle. If not, you have a major leak in your intercooler piping, intake manifold gaskets or your accordian hose....
Yea my car is stock as they get ,no mods, im a newbe to the supras , and how do you check the vaccum on the car
IBoughtASupra;1665490 said:
The vacuum at idle is created by the throttle plate being closed, so the leak would have to be after the TB before the engine.
Well, just saying, I had my charge pipe off and it read zero on my AEM gauge.
So the leak has to be one of the two intake manifold gaskets or the throttle body gasket. Replace all three at once so you won't have to worry about it.
So the leak has to be one of the two intake manifold gaskets or the throttle body gasket. Replace all three at once so you won't have to worry about it.
When i replaced the headgasket i also replaced all of the gaskets on the head including all the intake manifold gaskets too ,can i check them without breaking/tearing the gaskets
Does the engine idle properly? You said it basically drives perfect besides not building boost? Check codes and get back to us. Use a mechanical vacuum gauge on a good manifold vacuum source, sounds like you have the gauge sender hooked up to ported vacuum or theres something wrong with the gauge/sender (it shouldn't be connected to any of the ports on the throttle body, those don't measure actual manifold vacuum).
Ok will do,but the car is an auto so im sure its supposed to idle around 800rpm instead of 600rpm, and i will post more pics this weekend
a trick i use with snowmobiles to find intake leaks, carefully spray a little ether ( usually known as quick start or liquid fire, available at most auto parts stores ) around and listen, the idle speed will change when you find the leak. Might want to put on safety gogles when working with ether around a running engine.
Ok i started up the car this morning and faintly misfired around 1000 rpm when warming up, and now im in the process of alignment of the CPS with the engine at TDC