i could really use some help my car wont quit serging one minute it idles fine and the next it idles like crap what could it be if u could help i would be greatful
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Many things could cause surging. Vacuum leaks, a clogged IACV, low coolant levels, etc.Originally posted by duddles93
Have you noticed a pattern to when it does it? Are you in gear (if you have an auto)? Is it when the car is cold? What RPMs does it surge between? does it stop if you step down on the throttle? If you can establish a pattern, it is easier to diagnose where the problem is.1992 Prelude S w/swapped H22A -
it does it around 800 to 1200 rpm it quits when i crank on it what is an iacv an it is an auto but it dont have air intake on it yet would that cause it to surgeComment
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IACV is Idle Air Control Valve, and it is one of the things that helps the car maintain a nice, steady idle when your foot is off of the gas. They can get clogged over time and stop working properly. It sounds like that might be your problem. Do a search and you will find many articles on how to take it off and clean it. Its really easy.Originally posted by duddles931992 Prelude S w/swapped H22AComment
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where would i find a good article on itComment
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There are some stickies at the top of the Beginner Tech/Performance page that might be able to help you, or you could just try a search (in the blue bar).Originally posted by duddles931992 Prelude S w/swapped H22AComment
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thanxComment
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I'll just ride on my happiness regarding a little discovery I've made...
I recently had the same problem: idle would stick to 110 randomly:
TW sensor under the distributor cap goes bad, eventually throwing a CEL code 6.
Find a buddy with a CB7 and some tech know-how or a manual, and put his TW into your engine if he's ok with it.
Drive around for a bit. If the idle is good, you'll have your culprit. Just buy a new sensor from a dealer.
If not, then possibilities are:
dirty IACV (or malfunctioning)
maladjusted FITV (rarely malfunctions)
vacuum leak (hoses gone old)
air in coolant (bleed, refill)
anything else I've forgotten.
Good luck!
HONDAMENTALISMComment
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Search around the forum technical sections under FITV (fast idle thermo valve) and IACV (idle air control valve) for your answers. Also, search intake manifold related vacuum leaks.
Your answer lies there, been covered many times. You have to do research to understand the system somewhat in order to locate and fix your problem. That or just simply repair/check every idle related component to see if it works properly.
- FITV
- IACV
- air starting valve
- check for vacuum leaks on hoses and all parts attached to intake manifold
- idle adjustment screw set properly (if not, reset ECU after adjusted)Last edited by HondaFan81; 02-08-2008, 12:27 PM.Comment
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The FITW seems to be problem with a lot of Honda models of this era.Comment
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Idle fluctuation
Check your fast idle valve. Had that problem with mine, turns out the fast idle valve needed to be tightenedComment
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Originally posted by duddles93
Not likely. Theres some good info in PROBLEMS - SYMPTOMS & DIAGNOSIS LOGTake that freek show to the park, maybe the squirrels will care.
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