Vacuum chamber
#1
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Vacuum chamber
I've got low boost in 1st gear, so I'm checking my vacuum chamber. If I rev the engine in neutral it goes up to 15 or so, holds for 6 seconds and then drops back to 5. The drop is quick so I'm thinking it's a solenoid. It should just hold the vacuum, right ?
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Get a hand-held vacuum pump with gauge found at Napa.
You can use it to check any chamber and all check valves, actuators, solenoids, etc.
It is THE best diagnosis tool to have with our complicated vacuum/pressure system.
You can use it to check any chamber and all check valves, actuators, solenoids, etc.
It is THE best diagnosis tool to have with our complicated vacuum/pressure system.
#4
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Originally posted by Flybye
Get a hand-held vacuum pump with gauge found at Napa.
You can use it to check any chamber and all check valves, actuators, solenoids, etc.
It is THE best diagnosis tool to have with our complicated vacuum/pressure system.
Get a hand-held vacuum pump with gauge found at Napa.
You can use it to check any chamber and all check valves, actuators, solenoids, etc.
It is THE best diagnosis tool to have with our complicated vacuum/pressure system.
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Originally posted by Tom93R1
Isnt the vaccuum chamber the little black box on top of the engine? How is that a PITA to replace? Or is this not the vaccuum chamber?
Isnt the vaccuum chamber the little black box on top of the engine? How is that a PITA to replace? Or is this not the vaccuum chamber?
The one behind the power steering pump is the pressure chamber. THAT one is a BEATCH to replace.
#7
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Originally posted by Flybye
The chamber on top is the vacuum chamber.
The one behind the power steering pump is the pressure chamber. THAT one is a BEATCH to replace.
The chamber on top is the vacuum chamber.
The one behind the power steering pump is the pressure chamber. THAT one is a BEATCH to replace.
The vacuum chamber sits underneath the alternator. Believe me it's not an easy job. Alternator, oil filler neck pipe, intake elbow, intake--all come out--just to get at that damned vacuum chamber!
Last edited by SleepR1; 11-12-03 at 07:01 PM.
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Update: I teed into the TCA vacuum line. It jumps to 15in at the transition, which I think is correct. Strange because the vac chamber doesn't seem to have 15 in available.
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Update: The vacuum chamber seems fine. Am I correct in assuming what that the lines to the solenoids connected to the vacuum chamber (CCV,TCA,CRV) should be airtight ? Also, is the colored vacuum diagram incorrect ? It shows a vacuum line and a pressure line to the TCA under the UIM. Shouldn't one solenoid have vacuum and one pressure ?
#12
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Originally posted by Fred Sickert
Update: The vacuum chamber seems fine. Am I correct in assuming what that the lines to the solenoids connected to the vacuum chamber (CCV,TCA,CRV) should be airtight ?
Update: The vacuum chamber seems fine. Am I correct in assuming what that the lines to the solenoids connected to the vacuum chamber (CCV,TCA,CRV) should be airtight ?
Also, is the colored vacuum diagram incorrect ? It shows a vacuum line and a pressure line to the TCA under the UIM. Shouldn't one solenoid have vacuum and one pressure ?
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Originally posted by SleepR1
Not sure what you mean, but the hoses should be attached to the nipple rather snugly.
Not sure what you mean, but the hoses should be attached to the nipple rather snugly.
Nope that's correct. There's a pressure and a vacuum line to the TCA solenoid near the ACV. There's a TC solenoid on the solenoid rack, and this gets vacuum only.
From Wades site :
When the ECU applies no voltage to the Turbo Control Solenoid, the passage is blocked. Vacuum from the vacuum chamber is applied to one of the nipples. When 12V is applied by the ECU, the valve opens and vacuum travels through the solenoid.
His diagram looks right to me. Wades site
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There is an error in the diagram that's stuck to the hood. As I recall, the part number with an "A" is wrong, and the part number with a "B" is correct, but that was a while ago, so better check with those with better memories. I tried to order the corrected sticker, but it was unavailable.
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Originally posted by SleepR1
There's a turbo control actuator solenoid near the air control valve, and a turbo control solenoid on the solenoid rack. The TCA has a pressure and vacuum nipple.
There's a turbo control actuator solenoid near the air control valve, and a turbo control solenoid on the solenoid rack. The TCA has a pressure and vacuum nipple.
#17
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The turbo control actuator solenoid controls the turbo control actuator. The turbo control actuator operates using BOTH pressure and vacuum.
Please refer to the '93 Rx7 factory service manual for more details.
Please refer to the '93 Rx7 factory service manual for more details.