please help with mpfi swap

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Old Apr 12, 2004 | 01:06 PM
  #1  
1991dxhatch's Avatar
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From: rockledge, fl, a
Default please help with mpfi swap

ok i did the mpfi swap now my car will not start. Its now getting spark, its also getting fuel. i have code 10. if anyone has any ideas please help.
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Old Apr 12, 2004 | 01:45 PM
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5thGenKing's Avatar
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Default Re: please help with mpfi swap (1991dxhatch)

what ecu are u running?
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Old Apr 12, 2004 | 02:11 PM
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From: rockledge, fl, a
Default Re: please help with mpfi swap (5thGenKing)

pm6
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Old Apr 12, 2004 | 04:01 PM
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Default Re: please help with mpfi swap (1991dxhatch)

IAT Sensor (Intake Air Temperature) defective circuit or unplugged / defective sensor
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Old Apr 13, 2004 | 06:38 AM
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From: rockledge, fl, a
Default Re: please help with mpfi swap (tilt)

would that sensor make it not run. also do you know where that one is located
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Old Apr 13, 2004 | 06:50 AM
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Default Re: please help with mpfi swap (1991dxhatch)

Its on the right side near the bottom in the back area facing the side looking at it from the front. Don't you got a helms?
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Old Apr 13, 2004 | 06:53 AM
  #7  
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Default Re: please help with mpfi swap (1991dxhatch)



image taken from here:

http://www.fourthgenhatch.com/mpfi.html

very good writeup by fellow member. use it.
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Old Apr 13, 2004 | 10:09 AM
  #8  
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Default Re: please help with mpfi swap (tilt)

Isn't that green plug (which is unused in the picture above) suppose to plug into the EACV? And the white one that is in the EACV in the pic should be the leftover tandem vavle plug right?
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Old Apr 13, 2004 | 10:32 AM
  #9  
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Default Re: please help with mpfi swap (mengo_charged)

From a DX wire harness yes I believe so, thats what I did but extened the eacv. Thats a ZC so may be he is using a different harness all together?
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Old Apr 13, 2004 | 11:29 PM
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Default Re: please help with mpfi swap (ijjz)

what's wrong with his TPS sensor????
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Old Apr 14, 2004 | 08:38 AM
  #11  
1991dxhatch's Avatar
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From: rockledge, fl, a
Default Re: please help with mpfi swap (1991dxhatch)

thats hooked up. im going to try a new ece today i will let you know what happens
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Old Apr 14, 2004 | 08:58 AM
  #12  
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Default Re: please help with mpfi swap (1991dxhatch)

It might be plugged in, but it could be faulty. Try turning the car on, then unplugging it and see if it makes a difference.
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Old Apr 14, 2004 | 10:05 AM
  #13  
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Default Re: please help with mpfi swap (ijjz)

his tps sensor is on backwards

the iat sensor wires should be red/yel and grn/wht

and the eacv wires should be blu/yel and black
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Old Apr 14, 2004 | 10:56 AM
  #14  
1991dxhatch's Avatar
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From: rockledge, fl, a
Default Re: please help with mpfi swap (1991dxhatch)

all my wiring is right ive checked it 4 times. the car run perfect when the manifold was taken off. so i dont believe its the tps.
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Old Apr 14, 2004 | 11:47 AM
  #15  
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Default Re: please help with mpfi swap (1991dxhatch)

no not your tps, in the pic the tps looks funny because its on backwards
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Old Apr 14, 2004 | 11:56 AM
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Default Re: please help with mpfi swap (civickiller)

pull the hazard fuse for 10 sec to reset any codes, then try and start it again, if you still get the code then take off iat plug,

measure the volts between the red/yel and body ground, there should be 5 volts

measure the volts between the red/yel and grn/wht, there should be 5 volts.

if you passed everything, not its either the sensor or the ecu, so now

measure the resistance between the 2 terminals on the sensor itself, there should be 1-4 ohms. if you pass this test then its probably yoru ecu, replace with a known good ecu
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Old Apr 14, 2004 | 01:49 PM
  #17  
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From: rockledge, fl, a
Default Re: please help with mpfi swap (1991dxhatch)

just got back from the shop, found out that all four of my injectors are bad. i took the fuel rail off and no gas game out of injector. so i then can 12volts to injector and i get nothing. does anyone know what would cause all four injectors go bad. im using a resistor, but the first time i wired in the injectors i had the two wires crossed could this cause my injectors to fry. thanks for the help
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