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| Fiero sensitive to the weather? (Page 1/3) |
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Newguy7142
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APR 17, 08:12 AM
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I've heard that the fiero acts/drives different when the weather changes (warm/cold) is this true? I live in south Carolina, and currently the mornings here are cold cold cold and the afternoons are hot hot hot. Will this make the car run differently? My idle has been acting strange lately. Nothing too serious and no ses light, but still.
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hnthomps
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APR 17, 09:27 AM
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| quote | Originally posted by Newguy7142:
I've heard that the fiero acts/drives different when the weather changes (warm/cold) is this true? I live in south Carolina, and currently the mornings here are cold cold cold and the afternoons are hot hot hot. Will this make the car run differently? My idle has been acting strange lately. Nothing too serious and no ses light, but still. |
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I live in Columbia and have never noticed any problems with weather related changes (pouring down rain or high winds excluded) on any of my vehicles.
Nelson
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CJB118
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APR 17, 10:30 AM
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Our 88 2.8 is all stock, with new tune-up parts installed throughout, but it still acts up when the OAT is above about 75f. So, during a warm day, it idles slightly rough, occasionally stalls in traffic, and has a miss around 2500 rpm. Same day, after sundown, all of those issues disappear. I am not putting more effort into correcting it, because it is getting an L67.
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cebix
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APR 17, 10:35 AM
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Yeah I'd also say it runs different. In my opinion it runs better in the rain and moderatly warm outside. Runs rougher when very cold.
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Gall757
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APR 17, 10:41 AM
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Blacktree
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APR 17, 11:07 AM
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It could be a lot of things. I've seen sensors go bad, but not set a trouble code. Some of the sensors (like MAT and CTS, for example) only set a trouble code if the ECM detects an open or short circuit. Anything in between can fly under the radar, so to speak.
To give you an example, I once had an issue where the engine was acting up, but didn't set any trouble codes. The ignition system was all new, fuel pressure was good, etc. So I read the raw data from the engine sensors. I found out that the MAT was reading about 30*C too high, and that was making the engine run too lean.
The moral of the story is: Just because there isn't a trouble code, that doesn't mean everything is fine. The idiot light is no substitute for actual sensor data.[This message has been edited by Blacktree (edited 04-17-2018).]
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Tony Kania
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APR 17, 11:46 AM
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I take great care of my GT. 
I have been daily driving my 87 for a few years now. No matter the weather she runs great. It does run accordingly to atmospheric conditions.
If there are major changes, stalling, rough idle, etc., then there is an issue. That is not normal behavior.
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Newguy7142
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APR 17, 11:55 AM
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When I first start it up, the rpm bogs down very low for about 2 seconds like it's about to die, than it shoots up to normal rpm range. Also, it fluctuates between 800, and 1200 rpm (steadily bounces up and down). this all happens when idling. When I reverse or drive, the rpms are steady [This message has been edited by Newguy7142 (edited 04-17-2018).]
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cebix
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APR 17, 12:34 PM
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Chris Eddy
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APR 17, 01:08 PM
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I did have a bad MAT sensor, did not throw a code, but borrowing a code reader (87 duke has 8192bps) I could see that it was wrong. That did not affect running though.
I do have a cold start issue.. it will reliably start, but runs rough for 3 minutes. I suspect that it has an intake manifold leak maybe. I have scoured it for vacuum leaks.
It will live like that until the big swap in the sky.
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