Dashpot adjusting
#1
Dashpot adjusting
The dashpot on the TB of my '90 GTU does not appear to be adjustable. It is unlike the one shown in the on-line FM or Haynes in that it doesn't have an adjustment lock nut on the outer side of the device (see the attached image). There is a nut holding the device in place on the inner side, but it doesn't seem to have threads that would allow adjustment. Would appreciate it if someone can tell me if this type of dashpot is adjustable and, if so, how to do that. The nut is nearly inaccessible where it is located. TIA
#2
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Don't think I've ever seen a dashpot that really needed adjusting, but if yours does, I think the only thing to do is to create a little extension to the 'plunger' part with epoxy or something.
#3
Originally Posted by johnnyg
Don't think I've ever seen a dashpot that really needed adjusting, but if yours does, I think the only thing to do is to create a little extension to the 'plunger' part with epoxy or something.
The dashpots shown in the manuals are easily adjustable since they have a threaded central shaft with a lock nut on the outer side so that you can loosen the lock nut and rotate the dashpot to make the adjustment. This one ....?
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I can't recall exactly, but I don't believe this can be adjusted on my '91 either. The engine is in pieces in the garage right now, so I can easily check this later today.
#5
Originally Posted by johnnyg
I can't recall exactly, but I don't believe this can be adjusted on my '91 either. The engine is in pieces in the garage right now, so I can easily check this later today.
#6
Originally Posted by johnnyg
I can't recall exactly, but I don't believe this can be adjusted on my '91 either. The engine is in pieces in the garage right now, so I can easily check this later today.
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OK..it just look decieving. The shaft of the dashpot is threaded and threads into the holder. The nut is just a lock. By far, the easiest was to adjust this is going to be to remove the throttle body or the upper intake manifold.
#9
Originally Posted by johnnyg
OK..it just look decieving. The shaft of the dashpot is threaded and threads into the holder. The nut is just a lock. By far, the easiest was to adjust this is going to be to remove the throttle body or the upper intake manifold.
I just had some of that apart yesterday when I removed and cleaned the BAC. Guess I could have taken the next step and removed the TB.
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Thanks again!
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Yup, that's the only locknut. Loosen it up and you'll be able to turn the dashpot.
Describe your stalling problem? Does it just die at idle, or when you let off the throttle, or...?
Describe your stalling problem? Does it just die at idle, or when you let off the throttle, or...?
#11
Originally Posted by johnnyg
Yup, that's the only locknut. Loosen it up and you'll be able to turn the dashpot.
![Frown](https://www.rx7club.com/images/smilies/frown.gif)
Describe your stalling problem? Does it just die at idle, or when you let off the throttle, or...?
After cleaning and testing the BAC, I adjusted the TPS today using the 2-bulb method and then checked the resistance on the relevant connector pins and all checked out fine. I did make a minor adjustment to the TPS, but a test drive indicates that this didn't make any difference. So I will continue to troubleshoot other components. Fun!
Last edited by Go48; 07-19-05 at 01:51 PM.
#12
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When you take off the throttle body, also inspect the thermo wax thingy that controls the fast idle cam. If that isn't working properly, it usually gets stuck in the extended position, which keeps it in fast idle, holding the butterfly open in the throttle body. Then, when you set the TPS, you set it wrong (the throttle isn't fully closed), which has the BAC valve pumping more air into the engine than it's expecting at idle.
#13
Originally Posted by johnnyg
When you take off the throttle body, also inspect the thermo wax thingy that controls the fast idle cam. If that isn't working properly, it usually gets stuck in the extended position, which keeps it in fast idle, holding the butterfly open in the throttle body. Then, when you set the TPS, you set it wrong (the throttle isn't fully closed), which has the BAC valve pumping more air into the engine than it's expecting at idle.
#14
Originally Posted by johnnyg
When you take off the throttle body, also inspect the thermo wax thingy that controls the fast idle cam. If that isn't working properly, it usually gets stuck in the extended position, which keeps it in fast idle, holding the butterfly open in the throttle body. Then, when you set the TPS, you set it wrong (the throttle isn't fully closed), which has the BAC valve pumping more air into the engine than it's expecting at idle.
Thanks again for your help! I'll figure something out.
Larry
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Larry, if you loosen the set nut while the TB is out of the car, then you should be able to grab hold of the dash pot and turn it while it's mounted in the car. Although, I'm hardly optimistic that the dashpot has anything to do with your problem, but I really can't come up with anything else.
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