 Vibration during idle (theory for mine), Not like other threads, this is my theory on my situation. |
 Mar 25, 2011 - 1:33 AM
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 Enthusiast  Joined Dec 26, '09 From Albuquerque, NM Currently Offline Reputation: 19 (100%)  |
Correct me if I'm wrong.
I know STs are kind of notorious for having a rough idle, but I only experience a rough idle when the motor dips below about 900rpm. I've heard of bad motor mounts being the problem, but why would my motor have a super smooth idle before 900rpm? Seems to me that the engine works less at lower rpms, thus making less vibrations. So what I think might be happening is possibly a clogged/semi-clogged catalytic convertor. When I thought about it, it made sense. When my motor is at higher idle rpms (1,000-1,200), the exhaust velocity is high enough to smoothly overcome the clogged cat, but once it dips below the threshold of my rough idle, the exhaust velocity isn't enough to overcome the clogged cat, and it struggles to get through. It seems pretty reasonable and likely to me, but I'm not a master mechanic, I just have a basic, above-average knowledge of cars. Any input would be great. This post has been edited by HectortheRican: Mar 25, 2011 - 1:56 AM -------------------- taking too long to mod since '09
June '12 COTM '95 AT200 |
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Mar 25, 2011 - 10:56 AM
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Enthusiast Joined Jun 18, '09 From Orlando Currently Offline Reputation: 8 (100%) |
Same here, BUT, only in drive. It rarely likes to dip in neutral. I experience the same drop in RPM sometimes, usually when it's hot or cold and some accessories are on.
This post has been edited by SwissFerdi: Mar 25, 2011 - 10:56 AM -------------------- '97 ST \ Eibach \ KYB \ Kenwood \ Alpine \ Cusco \ OEM+ [sold 10/18]
'93 MX-5 LE |
Posts in this topic
HectortheRican Vibration during idle (theory for mine) Mar 25, 2011 - 1:33 AM
opie_7afe mine has a little rough idle and i have no cat....... Mar 25, 2011 - 2:33 AM 4-eyed-freek yup same here in the gt, i have no cat and it stil... Mar 25, 2011 - 11:42 AM HectortheRican Because IIRC, Kyle (96stgreendemon) had a rough id... Mar 25, 2011 - 11:55 AM 4-eyed-freek in your case it could be, all cars are different a... Mar 25, 2011 - 12:04 PM HectortheRican Exactly. I'll find out in the summer when I go... Mar 25, 2011 - 12:06 PM
stephen_lee add a 330 ohm resistor inline with the ecus coolan... Mar 25, 2011 - 5:50 PM HectortheRican QUOTE (stephen_lee @ Mar 25, 2011 - 4... Mar 25, 2011 - 9:48 PM |
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