MPFI done but low idle at warming up

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Old Mar 3, 2009 | 06:39 AM
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builtsinglecam's Avatar
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Default MPFI done but low idle at warming up

i just fixed my tps sencer wires but now it has low idle could it be the warming up valve in the back of the manifold? and also when i start it up it boggs down when i keep steping on the gas pedal then it revs up fine after that.
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Old Mar 3, 2009 | 07:15 AM
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Default Re: MPFI done but low idle at warming up

does your intake have FITV on it? if it does did u wire it? FITV only gives intake more air in idle in cold temp, so that shouldnt affect low idl; i would check ur EACV
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Old Mar 3, 2009 | 07:20 AM
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Default Re: MPFI done but low idle at warming up

Originally Posted by r4BBiT
does your intake have FITV on it? if it does did u wire it? FITV only gives intake more air in idle in cold temp, so that shouldnt affect low idl; i would check ur EACV
the fitv doesnt have any wires for clarifiation. it opens and closes from the coolant that passes through it. but it could be stuck closed. its located right under the throttle body. if you do a search there are writups on removing and inspecting it on here.
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Old Mar 3, 2009 | 07:58 PM
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Default Re: MPFI done but low idle at warming up

anyone else?
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Old Mar 3, 2009 | 08:10 PM
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Default Re: MPFI done but low idle at warming up

if you're using like an a6 intake mani and tb then you won't have a fitv. it is possible i would imagine that if the iacv was stuck closed all the time it might cause a low idle. is the idle always low or does it come up once the car is warmed up? it could simply be that the idle screw is set too far in.

try adjusting it

"Instructions to set the Idle:

-Warm the car up to operating temperature. This is generally determined when the radiator fan turns on if the car is stationary.
-Unplug the IACV valve on the back of the intake manifold. This needs to be done because the IACV valve is what the ECU uses to dynamically control the idle by allowing more or less air to bypass the throttle plate. Be careful not to burn yourself!
-Set the idle to 600rpm using the idle control screw. This screw controls the static amount of air that bypasses the throttle plate.
-Turn the car off and plug in the IACV valve.
-Reset the ECU. This needs to be done because the ECU will have thrown an ECU error code.
Restart the car. The idle should be running nice and close to 750 rpm."
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Old Mar 4, 2009 | 01:14 AM
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Default Re: MPFI done but low idle at warming up

check your plugs.
are you doing obd 1 swap? if yes, make SURE you are not using tps or iacv as the coolant tempt swtich ( i did that and after i switched it, idle problem went aawy)

make sure you got the FITV, TPS, and IACV at the right place.

http://www.nobodysuspectsthewagon.co...cm-wiring.html

theres the wiring diagram so make a double check.

3rd check timing either retard or advance.
Check your vaccum lines too.
other than that...thats pretty muich what i can come up with
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Old Mar 6, 2009 | 12:07 PM
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Default Re: MPFI done but low idle at warming up

Originally Posted by 90civichbsi
the fitv doesnt have any wires for clarifiation. it opens and closes from the coolant that passes through it. but it could be stuck closed. its located right under the throttle body. if you do a search there are writups on removing and inspecting it on here.
I don't know about your FITV, but mine has to wires and its plugged in to the ECU. Also mine is not located under TB, its behind the IM on the oppposite corner of TB. First i didn't have it plugged in, because i had to use that pin for something else when i was doing MPFI swap, but afterwards i got a couple ECU plugs from junkyards and wired it in. There was a www with ecu wiring (or maybe it was in manual).

edited: B2 is ECU pin is for FITV, and if i remember right it was a blue wire.

http://hondaswap.com/reference-mater...pinouts-28667/

Last edited by r4BBiT; Mar 6, 2009 at 12:15 PM.
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Old Mar 6, 2009 | 12:33 PM
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Default Re: MPFI done but low idle at warming up

Originally Posted by r4BBiT
I don't know about your FITV, but mine has to wires and its plugged in to the ECU. Also mine is not located under TB, its behind the IM on the oppposite corner of TB. First i didn't have it plugged in, because i had to use that pin for something else when i was doing MPFI swap, but afterwards i got a couple ECU plugs from junkyards and wired it in. There was a www with ecu wiring (or maybe it was in manual).

edited: B2 is ECU pin is for FITV, and if i remember right it was a blue wire.

http://hondaswap.com/reference-mater...pinouts-28667/
your thinking of the idle air control valve (iacv), it is located on the backside of the intake manifold, and it is controlled electronically. the fast idle thermal valve (fitv) is controlled entirely by coolant, has no electrical connection on it, and it is located on the underside of the throttle body.
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Old Mar 6, 2009 | 01:04 PM
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Default Re: MPFI done but low idle at warming up

I'm talking about that thing on the right, one of the wires is blue, which according to this link http://hondaswap.com/reference-mater...pinouts-28667/ is Fast Idle Control Solenoid Valve. I might be wrong though

Anyways work is done, time to go home
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Old Mar 6, 2009 | 02:32 PM
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Default Re: MPFI done but low idle at warming up

check ur intake air temp wiring i had problem with the idling at first too then got that fix and it solves the problem. gL
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