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#1
07-25-2003, 04:55 PM
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engine idle question
This isnt really a big deal but i figured i'd ask and see if anyone knew what was up. so the problem is that when i got my AC on and i'm stopped at a stoplight, even if the fan is on low the engine idles really low rpms, like lower than it should...like barely running. a guy i work with told me that there should be a relay or sensor or something that tells the engine to speed up when the AC is turned on so that the rpms dont go down but when i turn it on. because of this i have to turn off the AC every time i stop. so there might be something wrong? anyone know or got a clue?
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97 civic hx -------------------- mod list: CAI, 17" wheels but now removed and much more to come. not much of a list yet really 
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#2
07-25-2003, 05:42 PM
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i dont think this will fix it, but you could try adjusting your idle screw on your tb , turn it maybe a 1/4 clockwise and see what your rpm's are at when you turn the a/c on then.
Tb= Throttle Body
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Its not how fast you go it how fast you finish. Second place is the first looser Skunk2 Coil-overs Aem 2 piece intake Tanabe Exausht Throttle Body coolant bypass Apexi SAFC 2. Skunk 2 cam gear. ZEX dry nitrous system: currently 55 shot.   Best 1/4 Time: 16.402 @ 82 M.P.H w/ 2.290 60ft w/o spray 14.8@94 MPH w/ spray
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#3
07-25-2003, 05:53 PM
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What rpm does your car idle at when the A/C is off? I have a similar problem, but it's off and on. I have that problem when it's very hot outside. You can try to adjust the idle speed. But your friend's right. There supposed to be a sensor or relay to indicate when the A/C is on so the engine remains at the correct idle speed. If there's a problem with any of the sensors or the IACV, the check light should come on right? If the check light isn't on, well, I dunno. Hope it helps.
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My car isn't slow.....it's speed challenged.
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#4
07-25-2003, 06:30 PM
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the check light doesnt come on. i havent seen the light on at all and i've had the car since april. with the ac on the engine idles around 500 rpms maybe.
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97 civic hx -------------------- mod list: CAI, 17" wheels but now removed and much more to come. not much of a list yet really
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#5
07-25-2003, 09:59 PM
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does anyone have any other advice to help me? how to fix it? come on!
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97 civic hx -------------------- mod list: CAI, 17" wheels but now removed and much more to come. not much of a list yet really
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#6
07-26-2003, 01:32 AM
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your check engine light NEVER comes on? like even when you start the car?
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 LS1 RX-7 Zoom Zoom
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#7
07-27-2003, 09:48 AM
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well it comes on when i start the car. i meant it never comes on while i drive.
__________________
97 civic hx -------------------- mod list: CAI, 17" wheels but now removed and much more to come. not much of a list yet really
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#8
07-27-2003, 10:38 PM
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Actually, if you try to adjust the idle by turning the screw, most likely your ECU will override it, so that won't really do anything good. I had a similar problem with a mazda I had. Eventually I took it in to get checked out and the mechanic cleaned some parts in the throttle body and it worked fine. it just wasn't getting enough fuel. on another car i had it was an oxygen sensor right by the intake. it took me about 2 minutes to change. the light never came on by the way so it could still be a sensor. i say you take it to just get checked out by a regular mechanic and see if it's something you can fix urself. I really doubt that readjusting your idle will solve the problem completely and properly, though. Let me know how it turns out.
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#9
07-27-2003, 11:12 PM
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well i just added some fuel injector cleaner to my tank when i filled up yesterday so i'm gonna wait a while and see if that makes a difference if it was the problem of not getting enough fuel at low rpms. the car does seem to be running smoother, i just havent had the AC on yet.
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97 civic hx -------------------- mod list: CAI, 17" wheels but now removed and much more to come. not much of a list yet really
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#11
07-29-2003, 01:30 PM
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my old 97 EX did that, it seemed okay to me, since it would usually idle at 700rpm normally without ac. I think it's just one of those things, as a car gets older. It's not dieing on you is it? Maybe you alternator is going out
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2002 Civic Si 301whp and 255wtq at 10psi 263whp and 219wtq at 7psi 
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