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IACV-C14 Honda City 98 a/t
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connsuisjeeh
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Jan 31, 2023, 11:24 PM
Post #1 of 19
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IACV-C14 Honda City 98 a/t
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Honda City 98, 1.3 lxi a/t
this is what my car is showing
rough idle, check engine, code 14
>cleaned throttle body and IACV with care
= high idle (steady at 3k), C.E., Code 14
>replaced IACV, did an ECU reset
=still high idle (steady at 3k), C.E., Code 14
What should I consider next? T.I.A.
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Hammer Time
Ultimate Carjunky
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Feb 1, 2023, 5:01 AM
Post #2 of 19
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Re: IACV-C14 Honda City 98 a/t
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That's not a car we have here in the US so we have no specific info on the car.
High idle problems are generally caused by unmetered air getting into the intake or something mechanical getting jammed with the throttle plate.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Feb 1, 2023, 5:30 AM
Post #3 of 19
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Re: IACV-C14 Honda City 98 a/t
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Yes ^ that. It's plain old and not sold here a problem for us. Finding a leak of the sort 1st carefully look, light and mirrors, push and pull gently on air intake parts see if it changes.
However intake meets cylinder head, gasket or issue with metal even?
Happy hunting for it and good luck with certain parts,
Tom
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Sidom
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Feb 1, 2023, 12:52 PM
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Re: IACV-C14 Honda City 98 a/t
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I kinda agree here that you are probably getting some unmetered air causing the high idle.
One step you could do to give you a bit of direction to the problem is to block off the air passage inside the throttle body that supplies the air to the IAC valve. (Whatever type of plug you use, make sure it seals the passage tight and is big enough not to get sucked into the IAC valve.)
After the passage way is blocked off on a warm engine, when you start the engine it should go to base idle, which is usually around 400 rpm, just enough to barely keep it running.
If the engine goes to base idle, then you have a problem in your computer system or bad IAC (and new parts can be bad) keeping the idle high.
If the idle remains high, then you have an air leak or bad throttle body.
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Hammer Time
Ultimate Carjunky
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Feb 1, 2023, 1:02 PM
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Re: IACV-C14 Honda City 98 a/t
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Another thought is a bad temp sensor, either IAT or ECT will tell the computer it's real cold and that will rise the idle speed.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Feb 1, 2023, 1:02 PM
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Re: IACV-C14 Honda City 98 a/t
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Thought of another leak just not heard of one lately. If brakes are vacuum boosted, follow that hose, inspect it. ANYTHING to intake that uses vacuum. It's old could be a lot of things, you'll find it,
Tom
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connsuisjeeh
Novice
Feb 2, 2023, 2:51 AM
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Re: IACV-C14 Honda City 98 a/t
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Yes, we did just that, cover one of the valves, now it's at 500rpm. But I have to keep my foot on the pedal for the first few seconds as she automatically goes down to 0 rpm. After about 10 seconds at 1500rpm (with foot on pedal) she's stable at 500rpm.
Yes, we're looking at the compu box. The fact that we have a functioning replacememt IACV, yet it still detects IACV problems (code 14) kind of points to the comp. box as the next suspect ( I could be wrong though). I was just considering any other culprit that one might present to me.
My mechanic did not see any problems with the throttle body.
Thank you for your time replying to this.
(This post was edited by connsuisjeeh on Feb 2, 2023, 2:54 AM)
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Tom Greenleaf
Ultimate Carjunky
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Feb 2, 2023, 3:23 AM
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Re: IACV-C14 Honda City 98 a/t
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You seem to find the problem item/spot. That's 1/2 the battle. Computer can only adjust so much to info coming in then send that on to hold a realistic idle.
Code can and will be misleading but are useful but do not point to a specific item.
Again on parts. Try hard to be sure it's "that item" as new if you find it may be defective not usually in the same way,
Tom
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connsuisjeeh
Novice
Feb 2, 2023, 5:21 AM
Post #9 of 19
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Re: IACV-C14 Honda City 98 a/t
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Thanks. Yes, I'm quite aware about the importance of finding the right item. Well I hope it ends there (comp box) once it's repaired/replaced.
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Sidom
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Feb 2, 2023, 11:24 AM
Post #10 of 19
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Re: IACV-C14 Honda City 98 a/t
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You need to be careful, because this could be a wiring problem. Having a 14 after a place in the IC doesn't mean the computer is bad.
Since the idle lowers after blocking off the IAC this does indicate a computer or wiring problem.
At this point I would probably want to look at a wiring diagram and also a live data stream.
I'll take a look at a US model later on in my database and see if anything pops out
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connsuisjeeh
Novice
Feb 2, 2023, 7:48 PM
Post #11 of 19
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Re: IACV-C14 Honda City 98 a/t
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I did a double check on the CEL, this time via an OBD II scanner, says P1509 IACV circuit failure. Yes, I'm also considering that the wiring has something to do with this.
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Sidom
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Feb 2, 2023, 10:36 PM
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Re: IACV-C14 Honda City 98 a/t
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If you have access to the scan tools then post a data stream for us to look at. Specifically the coolant temperature reading. Post as much info as possible. Take a reading at idle and then 2000.
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connsuisjeeh
Novice
Feb 3, 2023, 1:43 AM
Post #13 of 19
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Re: IACV-C14 Honda City 98 a/t
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Unfortunately it was just a one time reading and it we never really read data when it was running. Basically just enough to dig into the error when it was on ignition stage (which was code 14 via paper clip to begin with). I had to stop there (price was a little high), I can sense that the fella knew he was one of the few who had the scanner in my neck of the woods, so he sounded high and mighty and ready to rip me off (if I ask for more scan procedure). lol.
Anyway big city peeps that I've consulted already confirmed this is a telltale sign of ECU problems. Will take it from there and see. Anyway, I'm sorry I can't provide the data.
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Hammer Time
Ultimate Carjunky
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Feb 3, 2023, 5:19 AM
Post #14 of 19
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Re: IACV-C14 Honda City 98 a/t
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If you don't have access to any of the required tools to fix this, you really shouldn't be messing with it.
You can buy a code reader for under $50, far less than a computer you likely don't need.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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connsuisjeeh
Novice
Feb 3, 2023, 4:22 PM
Post #16 of 19
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Re: IACV-C14 Honda City 98 a/t
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Thank you for the advice, I'm actually still considering one shop here just to make sure everything is checked via the scanner.
It was not just expensive, the fella was not pro-active to tell me what the implication was after the result came out. I presented the idea that maybe it could be the wirings as well, says maybe yes, maybe not and it stopped there. Comes across as a passive-agressive who's looking more to earn big bucks than actually one who wants to solve the problem.
Will update.
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Hammer Time
Ultimate Carjunky
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Feb 3, 2023, 4:34 PM
Post #17 of 19
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Re: IACV-C14 Honda City 98 a/t
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Sounds more like he just wasn't giving you a free diagnosis, not that he even could without further testing.
Computer diagnostics are very costly for shops and they need to get paid for their time and expertise.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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connsuisjeeh
Novice
Feb 3, 2023, 5:20 PM
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Re: IACV-C14 Honda City 98 a/t
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I actually asked for the price before the scan, I made sure he knows that I'm aware this comes with a price. He could have told me the next possible step(s) to be taken and I would not complain and look into that. But no, kept his mouth shut. Does not sound like someone with expertise to me.
I had ideas but I don't want to come across as a 'mr. know it all'. If there's anything going it should come from him. I take it back, he was not trying to rip me off, was just a non-conversationalist.
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Tom Greenleaf
Ultimate Carjunky
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Feb 3, 2023, 9:30 PM
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Re: IACV-C14 Honda City 98 a/t
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connsuisjeeh: OK, let's make some common sense here.
* The web is never going to be certain with a diagnosis vs being there and some things like this nobody will be.
* You seem so hesitant with 25 year old car and a mechanic/tech that doesn't want to just chit-chat about it IDK might be so busy.
* I'd like a fixed cost known up front too or at least a range of likely cost may not be so possible? Why? It's 25 years old for a start who knows what the car has been thru all those years leaves it to educated guessing yet parts tossing is usually a waste of money without magical luck.
If this guy isn't going to give you a price than set one yourself when to stop fixed or not.
This is or will be for sure. If you ignore this too long you'll need a catalytic converter.
In short if this guy or place isn't suiting you look for another place and mechanic.
Already suggested can you pin this to a limit you can tolerate for cost? It's costly to do this stuff at all a lot more than some other trades.
I feel the frustration costs matter - sometimes you can't peg it age is hard on plain wire and connections if things just bust touching them over that who should take the hit? Rock and hard place it's why people buy another car/vehicle perhaps if bothering you that much that's what you should do??
Tom
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