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After replacing Air Mass (Flow) Meter my engine's running different and surges... 200 1986

posted by  datadave on  Thu Jul 10 04:12 CST 2003
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My '86 245 has been a loyal friend for two years now even though I probably have saved it from a junk yard with it's body problems that previously owner's couldn't deal with....(leaking exhaust into car...) New Brakes I paid for and engine's been relatively great until my recent replacing AMM (which I couldn't afford a mechanic to solve..and this Board figured it out for me... Thanks again to "Lucid" and Volvodad!

Now this time: My engine's needing some timely help and this DIYer is starting down the usual road of perdition that many of the "hobbyists" here seem to be on...like keeping the Old Volvo long past any "normal" person should keep a car.

So Be It. My Questions are why is my engine surging??: sounding well at idle for about 3 seconds, then less well for the next 3 seconds, and over and over again...getting better after warming up but still surging at idle/ .

Also, My new rebuilt AMM obviously works as the old one stalled my car completely BUT my idle speed is slower after new AMM. Is that other people's experience?... I did turn my idle speed knob under throttle body counter clock-wise quite a bit....after noticing that it'd been turned almost as low as it could go before... by previous mechanic in response to my complaints that idle used to be too high.... well, My old AMM coulda been going bad for sometime... but shouldn't AMMs not effect idle speed? Used to be about 1000 rpm and now it's about 750.... I like it about 850-900 according to my dash tach which I know many of you don't trust...but I don't want to buy a handheld yet....


first choice ideas as to surging? Ignition timing? new timing belt?..(mine's over 5 years old even if mileage is only about 40 to 50 K)

anyone else experience either surging or differences in idle speed when replacing AMM?






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