99 Si revs all the way up
#1
99 Si revs all the way up
i just bought a 99 civic si. When I crank it up it revs all the way up. I changed the IACV, and map sensor. but it still does it. there is a round two wire plug(green&black) left of the dist. does any one know what it goes to.
#3
Honda-Tech Member
Re: please help
How many RPM is all the way up? 9000? The revving issues could be several things. IACV is one, which you replaced. Check the following: Vacuum line leak or throttle body gasket is bad. Does the throttle surge or just hang at xxxx RPM? Could be the idle adjustment screw also
#4
Re: please help
if i let the car sit for about an hour. it will crank up and surg between 1000-2800 rpms. after it runs for a little bit and i cut it off and re-crank it, the rpms will redline.
#5
Honda-Tech Member
Re: please help
Holy crap... I'm going to take a couple guesses: your throttle position sensor is busted, your throttle cable is stuck, you have a serious wiring issue, or your computer is faulty.
I've never heard of a Honda computer red lining the car on startup... I would very much like to witness this event.
I've never heard of a Honda computer red lining the car on startup... I would very much like to witness this event.
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#9
Honda-Tech Member
iTrader: (5)
Re: please help
Check the color codes for the wiring to the harness plugs that they go to the right sensor, ,they might be mixed up(IACV,IAT Map etc or the one that goes to the ps rack mixed up) use a Helms or other reliable schematics well at least thats where I would start.
#10
Re: please help
I have checked the cable. the owner before me put a b16a3 engine in the car and said he swapped everything over from the a2 engine. but I am wondering if he put the a3 and wiriing harness from the delsol into the car. if so, would the p2t ecu, running an obd1 engine cause this
#11
Re: 99 Si revs all the way up
Thread titles MUST be subject specific so that members browsing topics can easily understand the tech problem without reading the post -- title edited.
#14
Re: 99 Si revs all the way up
i finally fixed it. when they put this aftermarket intake on it, not only did they mess up the gasket, they didn't even put they nuts on the bottom of the intake..
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