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Motor Swap issues 

 

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 Post subject: Motor Swap issues
Posted: Wed Jun 25, 2008 5:06 pm 
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OK iv got car running Good Idling is fine and so is timing but when i go to drive it when the revs build up it Backfires and losses power
The motor is running very rich?
I am using the ECU out of A 4.0l aout and my car is a 3.9 manual now


Help Please

Last edited by duvauchellemotors on Sat Aug 02, 2008 4:01 pm, edited 1 time in total.

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Posted: Wed Jun 25, 2008 5:09 pm 
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could just be a flat battery.

 

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Posted: Wed Jun 25, 2008 5:12 pm 
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is the wire on the starter???

 

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Posted: Thu Jun 26, 2008 3:22 pm 
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no the battery is fine and the wire was on the startor
To get the car running i bridged the startor with the battery but i wont the key to work ????
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Posted: Thu Jun 26, 2008 3:27 pm 
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what ECU do you have and what month 1992 is your car?

 

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Posted: Thu Jun 26, 2008 5:13 pm 
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I have the 3.9 ECU in it and im not sure on month but its a 1992
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Posted: Thu Jun 26, 2008 7:59 pm 
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did centrepoint 3.9's have the injector cutouts in the head?

If not could pose a slight problem lol, has it got spark and compression?
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Posted: Thu Jun 26, 2008 8:14 pm 
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if you just put the motor and gearbox you can still use the eb ecu. i am sure a loom or something has been left off or something or fuse related is it a smartlock model??? or pre Smartlock? i did a manual conversion and couldn't start the caar for like 2 weeks it turns out i left the loom unplugged underneather the intake manifold

 

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Posted: Sat Jun 28, 2008 8:44 am 
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yea i dont think it is a loom that is left off because it can start when i run the started direct to the battery?

also when it does run its real s**t and missing at iudle also it back fires alot?
I am going to check to the plugs hope that they are the problem for it running bad but still puzzed about the starting problem?
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Posted: Sat Jun 28, 2008 10:21 am 
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it may be the auto box starter cut out since you removed the switch with the box. If you joint the wires it may work? I once had this switch die on me and had to short the starter solenoid with a piece of wire to start it.

 

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Posted: Sun Jun 29, 2008 1:19 pm 
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Yoy could be right but whitch of the wires are they
cheers

also when i have it running it wont idle and when i give it some rev to keep it going it back fires ou the exhurst and also out the intake manifold
I have a 4.0ltr manifold on it but i dont think that is the prob
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Posted: Sun Jun 29, 2008 8:48 pm 
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I wonder if the timing could be out, causing combustion problems, including out-of-phase, irregular, and incomplete combustion.

 

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Posted: Mon Jun 30, 2008 4:48 pm 
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I am having trouble getting the timing right im not sure if it is 10 past TDC or IGN i assume its TDC and 10 past is Ignithion if so where should the rotor be Through my knowlegd i think it should be around number one ??

Ive swaped distributers with the one of the 4.0ltr and now the car wont start but it has spark and the fuel pump is running So im bung out of ideas

Also can i use the 4.0ltr Computer even though it an auto one??
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Posted: Mon Jun 30, 2008 4:52 pm 
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also its very differcult to do the timing because it wont idle????
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Posted: Mon Jun 30, 2008 8:58 pm 
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duvauchellemotors wrote:
I am having trouble getting the timing right im not sure if it is 10 past TDC or IGN i assume its TDC and 10 past is Ignithion if so where should the rotor be Through my knowlegd i think it should be around number one ??

Ive swaped distributers with the one of the 4.0ltr and now the car wont start but it has spark and the fuel pump is running So im bung out of ideas

It is meant to be 10 degrees before top dead centre. That might fix things. Turning the dizzy clockwise retards the timing.

I suggest you turn the dizzy to as close as you can guesstimate, then try and run the motor and initiate the 'self test' mode. I found that adjusting the dizzy without doing the 'self test' mode (or resetting the computer by disconnecting the battery for say 30min) seemed to make the computer go a bit haywire.

Quote:
Also can i use the 4.0ltr Computer even though it an auto one??

I have heard of ways to use auto computers in manual cars, but that's a question for someone else.

 

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