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idle won't return to normal 200 1980

posted by  someone claiming to be bryan on  Mon Nov 13 11:52 CST 2000 [RELATED]

i have a unique car with what i expect is a common problem. need a little advice/help.

its a 1980 wagon with a 1986 engine and computer. trouble is, when the car is warmed up (not too sure about during warmup), when i apply the gas, then let off, the idle wont return back to the normal idle level. it stays high, right about where it was before i let off the gas.

the cable does not appear to be sticking, and nothing seems to be loose, such as vacuum hoses, unless i am missing a hard to spot one somewhere, like the ones that are under the intake manifold.

any suggestions on where to start?

thanks to everyone who spent time reading, thinking, and/or replying!







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    Re: idle won't return to normal 200 1980

    posted by  someone claiming to be L K Tucker, formerly L K on  Mon Nov 13 16:43 CST 2000 [RELATED]

    /// The simple answer is that the cable is binding. This requires geometry rather than mechanical skill. After cranking the car at idle mark the throttle plate pulley with a dirty finger or chalk, your choice. Advance the pedal and release. Look at the marked point on the throttle plate pulley. If, for instance, you made a line vertically when the car was at normal idle, a final position off verticle will tell you if the cable or throttle plate is sticking. There may not be much difference so check carefully.

    This won't cost anything and then you can move on to the expert advice you already have.







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    Re: idle won't return to normal 200 1980

    posted by  someone claiming to be Don Foster on  Mon Nov 13 13:16 CST 2000 [RELATED]

    Bryan --

    I would walk through a number of service steps.

    First, I'd make certain the throttle and linkage are free (not binding).

    Next, I'd clean the throttle body and properly adjust the butterfly using the mechanical stop.

    Next I'd adjust the throttle switch, and make sure it's functioning properly (electrically).

    Finally I'd remove the CIS motor (idle air valve) and wash through it with carb cleaner to wash out any gum 'n gunk. If the motor is electrically worn, it must be replaced. Be certain the electrical connector is clean and that the lugs are shiny.

    Also, I'd be absolutely certain the engine has no vacuum leaks and that the intake manifold is tight.



    Don Foster (near Cape Cod, MA)







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      Re: idle won't return to normal 200 1980

      posted by  someone claiming to be Zee on  Mon Nov 13 18:23 CST 2000 [RELATED]

      Don,

      > Finally I'd remove the CIS motor (idle air valve) and wash through it

      > with carb cleaner to wash out any gum 'n gunk. If the motor is

      > electrically worn, it must be replaced. Be certain the electrical

      > connector is clean and that the lugs are shiny.

      Have you ever tried to repair this motor electrically?

      From my '86 sedan, I found the commutator (?) (that is, the small diameter silver hub that the three copper contacts ride on near the bottom of the can) was worn in three spots. The copper contacts had worn three cupped gouges in the silver commutator.

      Having nothing to lose, I tried to float electrical solder into those depressions and build them up with the solder. Then I hand sanded them so the entire circunfrence was smooth and shiney.

      The motor actually worked for a couple of minutes. then, suddenly, something changed and the engine began racing above 2500-3000 as idle speed.

      (you may have seen my posts a couple of weeks ago about "Fast Idle Whoooooas")

      Still have this problem, eventhough I installed two different ICV's.

      Out of desperation, I switched the ICV connector with the one from the TPS, and this slowed the idle to about 950-1100.

      P.S. My classmate who engineers Cadillac, Olds and Buick said they farm out their technical writing. He didn't have anything for your thesis.







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        Re: idle won't return to normal 200 1980

        posted by  someone claiming to be Don Foster on  Mon Nov 13 22:38 CST 2000 [RELATED]

        Zee --

        "...ever tried to repair this motor electrically?"

        I've taken apart, oh, maybe a half-dozen of these motors—it's a bitch bending those tabs—and found that they all had commutators completely worn through. I don't think I salvaged any of 'em.

        When I decided to clean the TB on my '86 (which was thoroughly coated 'n clogged up with varnish) it resulted in a 3000 rpm idle.

        I found that the PO's moron mechanic had adjusted idle using the mechanical setscrew 'cause the CIS motor had long since died. Each time more varnish coated the TB, closing off the tiny annular opening around the butterfly, the idle would drop—so moron mechanic tweaked the screw.

        (He wasn't really a moron — he was a thief. Volvo owners willingly paid him for that type of work.)

        When I removed the accululated varnish, the annular gap was large and idle was high. Readjusting the mechanical setscrew and the throttle switch and installing a new CIS motor solved it all.

        "...farm out their technical writing. He didn't have anything..."

        Thanks for the thought!



        Don Foster (near Cape Cod, MA)







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          Re: idle won't return to normal 200 1980

          posted by  someone claiming to be jorn schreurs on  Mon Nov 13 23:02 CST 2000 [RELATED]

          Don,

          You normally trouble-shoot Volvo problems at 4 in the morning?? Man, you ARE Mister VOLVO! Sure you are not born in Sweden.

          (I access from the UK, it's 11 in the morning now)

          Reg,

          Jorn







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            It's not that early.... 200 1980

            posted by  someone claiming to be Don Foster on  Mon Nov 13 23:31 CST 2000 [RELATED]

            Jorn --

            "...trouble-shoot Volvo problems at 4 in the morning?"

            No, on our East coast it's an hour later than the time-stamp inserted by the BB server. I'm usually up 'n around between 4:30-5:00 (my time) on weekdays. When you see a "4:15" message from someone on the U.S. East coast it was really 5:15 local time.

            What's the old saying, "The early worm gets the birds..."?



            Don Foster (near Cape Cod, MA)






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