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help! 1998 civic ex
i recently bought a 98 ex and i drove perfect until about 50 miles after driving it, check engine light came on, started idling rough and when i tried to rev slowly it would go from 1500 to 2000 like a rev limiter. plugged the code reader and it showed a code for the iacv, replaced it, and reset the battery, after 50 miles of driving......same issue again. pissed me off because i had just spent 160 on the valve. did some research, cleaned the intake manifold checked wires, plugs fuses, everything, so i thought maybe it was the tps sensor, replaced it, reset the check engine code and same issue again after 50 miles, same code, iacv, checked vaccum leaks and im out of ideas, and now the last thing that might fix it is if i replace the ecu. if i replace the ecu, do i have to reprogram it? im stuck, i love this car and i have so many plans for it, but im stuck no with this issue, thanks for any advise
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Re: help! 1998 civic ex
You probably have an air bubble in the coolant line where it connects to the idle air control valve. If the valve gets too hot or not hot enough, it doesnt allow the correct amount of air to enter the motor and the map sensor sees this incorrect air flow and makes the idle air control valve act all wonky until it triggers a check engine light
Burp the cooling system and report back |
Re: help! 1998 civic ex
thanks, im not sure if i bled the coolant correctly the first time, is there a certain way to do it? thanks for the info, ill research how to take the air out
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Re: help! 1998 civic ex
https://honda-tech.com/forums/honda-...iator-3305287/
Originally Posted by EE_Chris
(Post 28754013)
I've never seen an OBD2 D-series with a bleeder bolt. If anything, old school GS-R's were the ones to have the bleeder bolt on the upper radiator hose fitting.
The OEM thermostat for the OBD2 D-series engine begins to open at ~180* and is fully open by ~195*. The radiator fan kicks on ~205*. Water boils at 212*. Make sure you have the heater control set to full hot (so that coolant can circulate through the heater core) but make sure the fan is OFF (so that it's not trying to cool the coolant you're waiting around on to get hot). Leave the radiator cap off. Helms says to "leave it loose". I can only guess this is to prevent coolant from spilling out while air bubbles are being purged. I just leave the funnel sticking out of the radiator neck. Fill the system with coolant, start the car and refill as needed. Stand around and wait for the cooling fan to at least come on once. I've NEVER waited a second time. If after the cooling fan kicks on once and you still see air bubbles, then wait some more. But in general, you really don't even need to wait till the cooling fan kicks on. By that time, you're assured that the thermostat has fully opened - or was suppose to. Believe it or not, there are people out there that will drain what they can from the system, refill it and then tighten the radiator cap up and call it "finished". It's those massive air bubbles that were never purged that cause problems with the hunting idle. I just did the timing belt on my 00 Ex this past weekend, so the procedure is fresh in my mind. https://honda-tech.com/forums/images/smilies/emthup.gif |
Re: help! 1998 civic ex
thanks alot, i will do this tomorrow and let you know if it worked, thank you for your time again
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Re: help! 1998 civic ex
Originally Posted by aygi21
(Post 51921113)
thanks alot, i will do this tomorrow and let you know if it worked, thank you for your time again
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Re: help! 1998 civic ex
Originally Posted by chrysler kid
(Post 51921092)
You probably have an air bubble in the coolant line where it connects to the idle air control valve. If the valve gets too hot or not hot enough, it doesnt allow the correct amount of air to enter the motor and the map sensor sees this incorrect air flow and makes the idle air control valve act all wonky until it triggers a check engine light
Burp the cooling system and report back |
Re: help! 1998 civic ex
tried burping the coolant and i think i have a bad head gasket, just kept bubbling
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Re: help! 1998 civic ex
Originally Posted by Freedo_Civegra
(Post 51921133)
MAP sensors detect air flow?
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Re: help! 1998 civic ex
Bubbling could also mean there is leak in the cooling system as well. If burping a second time doesnt help, the next step would be renting a cooling system pressure tester from autozone or oreilleys and pressurizing the system and watching and listening for leaks. |
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