1987 Buick Century Low/rough idle

1987 BUICK CENTURY
49,000 MILES • 6 CYL • FWD • AUTOMATIC
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ROB P
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  • 1 POST
I recently bought a 1987 Century 3.8L Auto with 49K. The car after running fine did not want to stay running some times. Engine scanner pointed towards a MAF so that was replaced and stalling stopped. The car still "putters" at idle. I've installed new plugs, wires and IAC sensor. These all helped a little but the car still putters at idle, more so after she is hot (after a freeway run). I believe the scanner showed TPS voltage of 4.5 at idle which I believe is correct. Could you point me some direction? I believe all the sensors are orginal equipment, the car was bought at an estate sale, the plugs and wires I believe were original equipment when I pulled them out. Thanks!

Rob Praydis
Hanover, PA
Jul 18, 2008 at 11:10 AM
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RASMATAZ
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Recheck the TPS voltage both idle and WOT. Also check the idle air control motor/valve
Jul 18, 2008 at 11:20 AM
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DGOOGIN88
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i was told its the timing,so i checked the timing and my timing is horribly off,its supposed to be 10 degrees before TDC and mine is past the marks so far i had to look pretty hard to even find the marks on the harmonic balancer.so have the timing done and maybe that will fix it.
Jan 11, 2009 at 8:02 PM
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