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Problems caused by shadetree fix on my 760? 700 1987

This is my first post, but I've found these boards to be a good resource for repairs.

My mechanic has a professional shop, but he, his brother and dad are the only mechanics. This means things tend to be a little shadetree-esque. They only work on European cars, and I've found their repairs reliable before. My only question is this:

I took my car in this morning because it was sometimes dying through low-speed turns or when shifting into reverse, or sometimes when braking at low speeds. I figured something was wrong wtih the idle, but wasn't sure what. They diagnosed it as a bad idle control valve.

Rather than sell me an expensive part, they suggested a fix they claim to have used on quite a few Volvos. They bypassed the bad valve completely by replacing it with a PVC ball valve assembly. (The kind you can buy at any hardware store!) I assume they had to do a little trial-and-error testing to see how far open it needed to be to get the right idle speed.

As shadetree as this fix might seem to be, the car is running perfectly compared to pre-fix. My question to those who might be "real" mechanics is this: do you suspect I'll have any problems with the repair being done this way instead of using the actual $120 (according to my research) part? I can afford to have a $120 part put on, but I am perfectly happy with the $30 repair and I appreciate the idea of getting things done cheaply with a little ingenuity.

What do you all think? I've run it with extra load (automatic climate control and aftermarket stereo running) and haven't had any problems with it idling since the PVC ball valve was put in.

Aaron
'87 764ti (and an '87 240DL that's in the same shop now for rough idle!)








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    Problems caused by shadetree fix on my 760? 700 1987

    I wouldn't really buy either suggestion (that the manual valve is okay, or that Volvo knew best). However, I've seen at least one other person replace the idle motor with a hand valve with some success.

    I'll agree tho that I am suprised they didn't take the motor out and soak it in some carb cleaner. That tends to free up most of them. However, if you cruise the junk yards for an idle motor off of any Volvo with the same injection setup.. you should be able to find a working one in better shape.

    But hey, if it works.. it works.

    - alex

    '85 244 Turbo
    '84 245 Turbo








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    Problems caused by shadetree fix on my 760? 700 1987

    I personally follow the golden rule, if it was put there it was put there for a good reason, Volvo back then being as good a car company as they were, and building engines with less parts then the american car's and building them to last, i would think it is there for good reason's, could possible be for Smog issues' could also be there so information can be relayed back to the computer so the computer can make other adjustments. Ive never in my life met a mechanic that would replace and electrical part with something like you have spoken about.

    It may work but id be cautious. for the price of the valve i would just replace it. Also keep in mind just what that motor does, it adjusts the idle all the time to keep the car idleing at the desired speed, which is supposed to be 800-900 rpm's. if you start having other problems with other parts that motor can adjust and keep the car running, with what you have that probly wont happen.








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    Problems caused by shadetree fix on my 760? 700 1987

    I can tell you that my tech did this with my old 760 Turbo when we suspected that the idle control valve was giving intermittent problems, and I drove it that way for a month with no ill effects. I don't think the idle stablized as quickly and cleanly when I took my foot off the gas, but the car never died or spluttered.

    As to whether this is a suitable permanent fix, I cannot say, but if they claim they do this all the time, then I would think they know(?).

    Incidentally, often the idle control valves can be freed up internally by soaking them in gasoline or diesel. I'm surprised these guys did not try this, given their inventive approach. (That being said, if they are too full of crud the soaking may only bring them back to life for a short time).

    Steve







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