Hey guys, ok well here is my problem. Right when I start up my car when the car is "cold" my engine will rev to 2k then back down to almost 0 then back up to 2k over and over again. It seems to only happen when I have the air running though. I thought that I might have been the cooling system, like there could have been bubbles or something so I had a complete flush and put brand new coolent in. Nothing happend. So I have just about to give up, you guys are my last chance! Have any ideas?
need more info...does it only do it when u start then goes away once the car is warm...or does it do it constantly? were you driving hard when it happened? is this the first idle problems u ve had? are all your vacuum lines plugged right ?
it might the the common idle problems that everyone has had...thats an easy fix...but give me more info...as much as u can, so I can think of more solutions and post everything at the same time.
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ok well lets see. It only happends when then car is first warming up. It seems to happen right when I let out the clutch comming to a stop (I am not sure if that is true, but thats what it seems like). I dont drive hard when it happends. This is the first idle problem that I have ever had. In order to stop the revving I have to tape the gas pedal just slightly and it will idle normally. It seems to only happen when I have the air-conditioner running right at the start up of the car. After maybe like 1-5 min of the car warming up it wont happen again.
have you looked inside your throttle body lately? If it is dirty then clean it using intake spray and go from there. maybe also check your throttle rotor for grit can get stuck there causing the throttle plate not to close properly when comming to a stop. Air leaks = fluctuating idle whether its a vacuum leak or a throttle plate air leakage.
it sounds that your IACV (idle air control valve) is giving away. it usually starts out that when, it only does it when the car is cold, then once it warms up it goes away...it gets a lil worst after a while, and starts doing it constantly...no matter how hot or cold the car is. Thats an easy fix, and has been covered quite a few times...look at this thread, and read my post...that helped him fix the problem...so try it, if u do it, and it doesnt not work then let us know we ll think of something else.
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Yah ^... basically if the fluxuation is intermitant, it may be something is giving way. Do the simple stuff first... cleak the screens on the iacv... check vaccum lines... do the lower tb port test to see if it is the fitv (put finger over lower hole... see if there is suction)... Yah take it from me... I've done almost everything you can do for idle flux fixes.... till finally it turned out to be a vac leak from my IM which was warped... had to have it ground down...
and really, please try not to address this problem with sea foam... it may cause you more problems... isolate it first.
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-Steven
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Originally Posted by vile10
not to offend anyone but usually when you hear a loud noise but never see the car for a long while, that's probably a civic
Ok, let me ask this, when this started happening, or around that time. Did you put a short ram or CAI in you lude? If so its probably your vaccuum lines. Alot of times they will leave a line disconnected because there isn't a nipple for the line that went into your stock intake. This happened to me and it drove me nuts. What happened was the tech capped the vaccuum line with a screw to stop the airflow into that line. THe real fix would be to have a nipple threaded into the CAI/Short Ram and put the vaccuum line back on. Otherwise if you uncap it it will almost fix your revving issue.
Ok, let me ask this, when this started happening, or around that time. Did you put a short ram or CAI in you lude? If so its probably your vaccuum lines. Alot of times they will leave a line disconnected because there isn't a nipple for the line that went into your stock intake. This happened to me and it drove me nuts. What happened was the tech capped the vaccuum line with a screw to stop the airflow into that line. THe real fix would be to have a nipple threaded into the CAI/Short Ram and put the vaccuum line back on. Otherwise if you uncap it it will almost fix your revving issue.
if it was a vacuum line, his problem would be constant...and not go away after the car is warm.
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NOTE:
My domain name has changed. If any pics I have posted in the past appear to be missing you will need to copy the old link of the image(right click on the red X or not found link and click view the properties of the image, or quote my post to get the URL), remove the gzone.homelinux.org part, and replate it with thegzone.net/old_site/. Thanks.
Not true, The throttle body has two phases cold idle and warm idle. theres an extra litle hole in the TB that opens when it is cold and uses the vaccuum lines differently from stage to stage. Forgive the grammar. Spanish speaker.
You're talking about the fitv. It's a valve that only allows more air flow in when the car is cold. It has nothing to do with the vaccum lines... the lines that are hooked up to the fitv are coolant lines.
When the car is cold, the valve is open and coolant runs through the tb which isnt at normal operating temperature yet... thats why we idle high when the car is first started. After the coolant/car gets to normal operating temp, the valve closes and the idle drops to normal.
__________________
-Steven
Quote:
Originally Posted by vile10
not to offend anyone but usually when you hear a loud noise but never see the car for a long while, that's probably a civic
I currently have the exact issue with my 93' vtec, I have narrowed the issue to the Throttle position sensor a.k.a. Throttle angle sensor. The sensor controlls throttle adjustment. I am positive that mine is causing the reving during cold start up. The sensor sits on the firewall side of the throttle body/carb. Try disconnecting the plug on the sensor and start the car with a cold engine. I am currently trying to find a replacement for mine w/o going to the dealership, they wont sell it w/o the entire throttle body about $600. I'll let you know as soon as I get my replacement installed. The Sea-foam is also an excellent product I saw that it was suggested to you already. Run it through all systems fuel, oil and air intake, It worked wonders for me. Use it somewhere that you can release ALOT of foul exhaust though and change your plugs afterwards.
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"Life is like a game of chess. You must think first, before you move."
In my honest opinion, it isn't a smart idea to rely on sea foam until AFTER you have isolated the problem and have it fixed. Sea Foam can actually eat up some carbon build up that may have certain holes plugged and you will get other leaks.
How do you know its your throttle sensor?
__________________
-Steven
Quote:
Originally Posted by vile10
not to offend anyone but usually when you hear a loud noise but never see the car for a long while, that's probably a civic
I was able to swap mine with a friends who has the exact same engine. The idol problem was gone. To be sure I put mine into his engine and kept his in mine overnignt, started it in the morning idoled up between 1500 and 2000 held steady and once it warmed up dropped to about 650. Unfortunatlly I couldn't keep it so I need to find a new one...
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"Life is like a game of chess. You must think first, before you move."
I see. Yep, they dont sell those seperate from the entire TB unit... sucks ass =[... where are you from? Hit up some of the pick n pull places and junk yards.
__________________
-Steven
Quote:
Originally Posted by vile10
not to offend anyone but usually when you hear a loud noise but never see the car for a long while, that's probably a civic
I'll chime in and say that yesterday my car did the same exact thing at start up. It was also the first cold day here this year. Car is dead stock and I definitely have it tied to the cool weather.
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