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Re: Mystery Hose/Cold Start Idle Posted by Justin VanAbrahams [Email]  (#32) [Profile/Gallery]
(more from Justin VanAbrahams) on Wed, 28 Nov 2018 07:29:08
In Reply to: Re: Mystery Hose/Cold Start Idle, Kenny Crippen, Tue, 27 Nov 2018 19:24:39 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Yes, a different part number - you can use 86/87/88... I'm sure you can find the actual part number or Bosch number by searching this site. But, it's almost assuredly the AMM. The issue on the '85 was far more subtle than that. The 1000rpm rev until warm is usually caused by a bad AMM. When the car is cold it relies 100% on the AMM for mixture. Once the O2 sensor warms up and starts providing feedback things tend to level out. When it's cold, and the AMM is providing bad data the idle is unstable as it leans out, starts to stall, and ECM opens the idle valve to keep it running, revs high, idle valve closes, gets lean, nearly stalls, and again and again. Sometimes you will find vacuum leaks, a bad O2 sensor, a bad NTC sensor, or on an '85 bad wiring, but the AMM is always the thing nobody changed for 30 years because the car generally runs right.
posted by 66.60.14...
, Tue, 27 Nov 2018 05:29:00, Wed, 28 Nov 2018 07:29:08 <-- Viewing This Message, Wed, 28 Nov 2018 21:07:52, Mon, 26 Nov 2018 07:19:44, Mon, 26 Nov 2018 09:29:20, Mon, 26 Nov 2018 11:16:59, Mon, 26 Nov 2018 13:03:27
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