Really using your boost gauge to find sequential issues
06-10-17, 07:55 AM
#1
RX-7 Bad Ass
Thread Starter
iTrader: (55)
Really using your boost gauge to find sequential issues
Hey all -
Some posts recently made me think about this.
This is a troubleshooting technique I've used for quite some time but I don't think anyone has really talked about or documented it.
Everyone knows you need a boost gauge to troubleshoot turbo problems. Most people look for the 10-8-10 pattern or whatever, and if it's not that, they know they have a problem. But, that's not the end of what your boost gauge can do.
Get a vacuum T and some extra hose. T the boost gauge into various solenoid vacuum lines, drive around, and see what you have.
For example, the turbo control actuator has 2 ports, one that should get boost and one that should get vacuum when you transition. T into the boost side, at the transition you should see the boost gauge go from 0 (atmospheric) to boost. T into the vacuum side, you should go from 0 to vacuum. If you don't see vacuum, for example, then you know it's that side of the system, time to look at the vacuum tank, check valve, and the solenoid.
Using the vacuum diagram you can typically find a spot to T in that doesn't require too much disassembly to get to.
It's also worth doing on a car that's working properly so you can see what it's supposed to do when all is well
.
Dale
Some posts recently made me think about this.
This is a troubleshooting technique I've used for quite some time but I don't think anyone has really talked about or documented it.
Everyone knows you need a boost gauge to troubleshoot turbo problems. Most people look for the 10-8-10 pattern or whatever, and if it's not that, they know they have a problem. But, that's not the end of what your boost gauge can do.
Get a vacuum T and some extra hose. T the boost gauge into various solenoid vacuum lines, drive around, and see what you have.
For example, the turbo control actuator has 2 ports, one that should get boost and one that should get vacuum when you transition. T into the boost side, at the transition you should see the boost gauge go from 0 (atmospheric) to boost. T into the vacuum side, you should go from 0 to vacuum. If you don't see vacuum, for example, then you know it's that side of the system, time to look at the vacuum tank, check valve, and the solenoid.
Using the vacuum diagram you can typically find a spot to T in that doesn't require too much disassembly to get to.
It's also worth doing on a car that's working properly so you can see what it's supposed to do when all is well
.Dale
