strange and unhooked wires/sensors/plugs

General engine questions/issues that aren't specific to the other categories
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strange and unhooked wires/sensors/plugs

By XangerissuesX
- Fri Mar 13, 2009 12:53 am #102755 so i went searching for why my civic was running bad and i found a couple things that were unplugged and just hanging there. its idling rough and doing the ever popular up/down idle between 500-1000 rpm. i'm not sure what engine it has because the swap was done before i got it... i'm thinking d16y7. thats the block it has. any clue on what these are and where they go?

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This is where the black one hides...
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By Faded_Milano
- Fri Mar 13, 2009 2:05 am #102781 those are awfully small pictures. I can't seem to figure out what they are.
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By XangerissuesX
- Fri Mar 13, 2009 2:26 am #102800 i cant take any bigger until tomorrow. i guess the only thing that would help is to know they both hang back behind the IM. should have put that up earlier.
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By Greasedmonkey
- Fri Mar 13, 2009 3:31 am #102839 First looks like an IAT (intake air temp) sensor.

Second is I believe the purge control soleniod. From the looks of it you have a y8 intake manifold.

Purge thing wont mount to it. OBD1 also doesnt use a IAT either that I recall, so Im not sure why that would be there unless you have a y8 engine harness as well.
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By suspendedHatch
- Fri Mar 13, 2009 6:48 pm #102996 Right, IAT and Purge Control.

Of course OBD1 has IAT! Even OBD0 has IAT!! You NEED it on any speed density system. W/out it, the ECU doesn't have enough information to calculate how much air is going into your engine! In other words, if you have a MAP sensor, you have an IAT sensor.

What happened was that the person who did your swap was extremely lazy. OBD1 engines have the IAT mounted in the intake manifold. OBD2 engines have it mounted in the intake tube. You will have to extend your wires so that the sensor can reach the intake tube just before the throttle body. Then you will have to drill a hole, mount the IAT, and make it air-tight.

This is assuming you have an OBD1 ECU With the purge control valve, you will have to get a throttle body from an OBD1 car. This one has the necessary port on top for the vacuum line to the charcoal canister. Then you will need to get a vacuum T and T in the vacuum line for the control valve.

If you have converted to OBD2, then you will need to get a charcoal canister from a 96+ Civic or Integra. Don't worry, it slides right into the bracket you have on your chassis. The OBD2 canisters have one less vacuum line and a different style of purge control that's sitting on top of the runners of your intake manifold. Connecting this up will be fairly obvious. I suspect that this is the cause of your poor idle condition.

Lazy, ignorant Honda swappers :thumbdown: :thumbdown: :thumbdown:
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By XangerissuesX
- Mon Mar 16, 2009 4:53 am #103597 Wow.
Amazing replies. Thanks so much. Yes the guy that did the swap was an idiot. You should see the rest of the car. Gauges in the passenger side of the dash. Not even hooked up. All of the wires run to the engine bay and are spliced into each other and various other wires. Intake made of random plastic tubing connected to a very dirty and beat up filter. Huge cursive HONDA decal on the windshield. Stupid huge split pipe exhaust. (gonna be first thing replaced)

do you know how i could tell which head it has? its got a y7 block, and you said y8 intake, so that leads me to believe that it may have a (possibly poorly done) mini me in it. that worries me...

do you think that between these, a huge crack in the header, and the incorrect ecu, the mileage, idle, and performance would be negatively affected? it currently has the auto transmission ecu in it. as far as i know, the ecu will just cause a check engine light, but i've read about vtec plus non-vtec ecu or vice versa = bad when it comes to oil pressure and something else. idk. i'm still learning. i'm going to UTI in september for this. its got two check engine lights right now, but i know the causes of them. primary o2 sensor heater and auto tranny lock up.

thanks again for everything.
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By suspendedHatch
- Mon Mar 16, 2009 6:16 pm #103680 Sounds fubar to me. Yet you bought it. This guy I know is a used car salesman. He says "there's an ass for every seat".

I would pull the engine harness out completely and get one from an OBD2 car along with the correct ECU.

Well is there a VTEC solenoid?

"Negatively affect" are you kidding me? That's an understatement.

ECU's have absolutely nothing to do with oil pressure. VTEC has absolutely no effect on oil pressure.
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By XangerissuesX
- Mon Mar 16, 2009 8:09 pm #103697 yeah. well most of the problems i knew would be good for me to learn on, and like i said, its something i am interested on doing as a career.

the injector wiring is electrical taped together. and is now melted all to hell. its a mess.

it doesn't have one, but what i was trying to figure out is what would happen with a y8 head, no vtec solenoid or ecu. sorry about the oil thing. it was a noob guess from what i read.

i know it'll hurt it. just trying to learn the side effects so i might be able to trouble shoot it next time.
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By suspendedHatch
- Wed Mar 18, 2009 2:48 am #104059 If your Y8 head had a missing VTEC solenoid, oil would spew out of the gaping hole.

With no ECU the car would crank but not start.
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