No boost.... acts like it wants to...
08-28-08, 10:29 AM
#1
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No boost.... acts like it wants to...
Regarding my STOCK 87 T2
Boosted fine this morning while it was cold (first couple minutes of my drive)
I sat in traffic for about 1 hour, the car ran and drove fine but once traffic cleared the car refused to boost. It would hover over the 0 mark on the stock boost guage, and not go any further. The car idles great, but drives like an N/A. It will accelerate smooth all the way to redline, but just isn't boosting today...
Here are my thoughts- the car was just vacumme checked and it was all good, no leaks, no idle issues... The car boosted for a few minutes while cold.. (opposite of most peoples issues)
How possible is it that the wastegate is stuck open? I can't even hear the turbo spool, but when I remove the intake the turbo spins freely with no shaft play to speak of...
Any help would be great.. i am daily driving the car right now.. Oh also this is my fist "unmodified" rx-7.. I am getting around 17-20mpg.. is that pretty normal?
Boosted fine this morning while it was cold (first couple minutes of my drive)
I sat in traffic for about 1 hour, the car ran and drove fine but once traffic cleared the car refused to boost. It would hover over the 0 mark on the stock boost guage, and not go any further. The car idles great, but drives like an N/A. It will accelerate smooth all the way to redline, but just isn't boosting today...
Here are my thoughts- the car was just vacumme checked and it was all good, no leaks, no idle issues... The car boosted for a few minutes while cold.. (opposite of most peoples issues)
How possible is it that the wastegate is stuck open? I can't even hear the turbo spool, but when I remove the intake the turbo spins freely with no shaft play to speak of...
Any help would be great.. i am daily driving the car right now.. Oh also this is my fist "unmodified" rx-7.. I am getting around 17-20mpg.. is that pretty normal?
08-28-08, 12:01 PM
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Think I found it. The vacumme hose from the intake to the pressure sensor had a crack in it... I am on the way to the store to buy about 10 feet of hose to replace all the vacumme lines.. They are a little brittle...
08-28-08, 12:56 PM
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Weird.. After disecting the brittle tube that was cracked i found a small black plastic peice inside the hose (about 1/8 of an inch long with a large hole on one side and a small hole on the other side... Anyone know how needed this is or what it is?
08-28-08, 01:07 PM
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I'd bet it is a restrictor in the hose going to the waste gate - part of the boost control system. If you don't have the restrictor you probably will not hit full boost.
08-28-08, 01:31 PM
#7
Pull the BOV and make sure you can't blow air through it without applying vacuum. Then inspect the wastegate actuator/arm, which is unfortunately hidden by the heat shielding. Make sure the arm didn't come off of the flapper door or something. I've heard of people making small amounts of boost with problems with either of these, so it is strange that you have 0 PSI at any throttle level/rpm.
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08-28-08, 05:10 PM
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Yeah that fixed it... Something simple.. All I did was replace the vacumme hose going to the pressure sensor, and put the restrictor plug back in... Boosted great on the way home.. Yee HAw!
08-28-08, 06:37 PM
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