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Solved driveability mystery problem (after a lot of wasted effort) 200 1992

posted by  someone claiming to be Dharvey on  Sat Nov 2 18:09 CST 2002 [RELATED]

You know how the littlest thing can sneak by while you're checking all the important stuff?

I have posted several times about my wagon/AW70 bogging down seriously (even dangerously) when pulling away from a dead stop. Well, it wasn't the rotor or the cap or the coil or the plugs or the fuel pressure or the AMM. The throttle body and the IAC are clean. All hoses tight. etc... No trouble codes, and a disgnostic scope didn't find any either.

A few days ago I reported that disconnecting the battery fixed the problem. Well, it fixed it for a few miles, then the next day the bogging started again. The bogging would sometimes be better, sometimes worse, but always not right. Hmmmmmmm...

A couple of months ago I started hearing a little hiss from the center console when I had the floor vent button out (closed). A local shop said it was the vacuum control not closing completely, allowing some air to bypass. I noticed that I still got some air from the high-level vents so I assumed that the leak was internal to the system and not to the outside air.

So when this driveability problem started, I didn't put 2 and 2 together. Neither did the Volvo shop. Turns out, if I open the floor vent button, the hissing goes away--the valve must seal correctly in that position. AND, if I open that vent and leave it open, the problem GOES AWAY!! The car runs perfectly. Well, maybe 95% like new. It's got just a touch of hesitation, so maybe there is a leetle bitty vacuum leak somewhere else.

I was driving it tonight and closed the floor vents for a few seconds, just as an experiment. The Check Engine light came on with Code 232--"system compensating for rich or lean mixture". Hmmmmm. A vacuum leak would introduce extra air, right, making the mix lean. That's how the car ran--like it was leaning out. I deleted the code and test drove it again--no engine light.

Solving this is a strange feeling--a combination of feeling real smug that I figured it out before a Volvo repair shop could, and feeling real stupid that I messed around for a month before just trying that button in the other position. At least I didn't replace the computer.

Now If I can track down the loud BANG from the right rear hub sometimes when I go from forward to reverse or reverse to forward (all rear bushings are good, everything is tight in the rear axle), I'll be in good shape.

Doug Harvey






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