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Re: 1989 900T running slightly rough and lean Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 1 Jun 2006 08:19:56
In Reply to: 1989 900T running slightly rough and lean, Desmond Jones, Thu, 1 Jun 2006 07:40:13 Members do not see ads below this line. - Help Keep This Site Online - Signup |
With lean running, I wouldn't expect to smell gas in the exhaust. In fact, if you do smell raw fuel in the exhaust, I'd expect either rich running or one cylinde where the spark plug isn't firing. That would be VERY rough. And the raw fuel will destroy the catalytic convertor very quickly.
First things first - pull the spark plugs - they live in the engine and will tell you what is going on. Do they look rich (black and fluffy), lean (white) or just right (light grey). Raw fuel on any of them? Are all the plugs the same, or does one cylinder look different? Replace the plugs if they look old, and make sure the gap is correct.
If you're running lean and the car doesn't idle well, I'd immediately suspect a vacuum leak. Check all your vacuum lines for broken or cracked hoses.
but check those plugs as the very first step.
posted by 192.249....
, Thu, 1 Jun 2006 08:19:56 <-- Viewing This Message
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