RPMs very slow to drop |
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RPMs very slow to drop |
Tdskip |
Oct 16 2018, 03:40 PM
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#1
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Advanced Member Group: Members Posts: 3,686 Joined: 1-December 17 From: soCal Member No.: 21,666 Region Association: None |
Hi guys-hoping to get some sage advice here on what's going on. I am picking at the 1973 1.7 L D-jet car and when I was test driving her today she did not want to return back to idle.
When you accelerate in first gear up to about 3500 or 4000 RPM and then take your foot off the gas the RPMs stay at the same level or climb slightly and then only slowly drift down. She starts fine and will idle at about 1000 RPM, air bleed screw is close to all the way in. There is an aftermarket return spring on the throttle assembly but appears to have the right amount of tension. I took the air cleaner off and when I manually actually the throttle it appears to settle down faster than when I do it with the gas pedal. The pedal does not appear to be binding on the carpet or interior trim. Any ideas for me? Thanks! |
andreic |
Oct 16 2018, 04:35 PM
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#2
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Member Group: Members Posts: 172 Joined: 21-December 15 From: Madison, WI Member No.: 19,479 Region Association: Upper MidWest |
1) You must be having some pretty bad leaks if you can not bring the idle down with the screw on the throttle. Replace all vacuum lines and/or test with a carb cleaner spray at all connections.
2) If the problem is not mechanical (throttle plate not returning to idle position by itself) you may also have a problem with the distributor timing advance. One of the two vacuum lines from the throttle body goes to the distributor in order to retard the timing at idle -- this lowers the idle RPM for emissions control. If the advance plate in the distributor sticks, or the canister does not hold a vacuum, it may be slow to retard the timing, so the idle is slow to come down. |
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