Date: 20 Sep 1999 14:57:59 GMT From: hoopsnopsamcom (Lonn Howard) Subject: Re: Rough idle on 90 900t
In article <jjvantol-1909992351430001nopsam.0.2>, jjvantolnopsamst.net says... > >In article <VeZD3.3093$cz.66421nopsam2.mia>, "Richard and Paula" ><rmarlownopsamam.bellsouth.net> wrote: > >> My 1990 900 Turbo does much the same, but the idle fluctuates once it is >> warmed up. I am told it is the ECU which needs to be specifically for a 1990 >> 900T, not one from another years model. I had the oxygen sensor replaced >> which allevieted the problem slightly. >> >> Mike Prager <cmp19m1znopsamnet> wrote in message >> news:G6QD3.437$td5.10543nopsamtx1-snr1.gtei.net... >> > My 900 Turbo revs and drops while warming up in the morning. >> > >> > > >Check the air mass meter, also check for proper operation of the idle air >control motor, and for vacuum leaks. ECU failures are EXTREMELY rare, and >are usually complete failures when they happen. I would also suggest vacuum leaks as the culprit. Every time I get a rough or surging idle I have been able to trace it down to a vacuum leak. Easy to find and fix. Good luck, Lonn 89 900T 'vert