why is my si/mpfi conversion dx boggy only sometimes?

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Old May 9, 2003 | 07:59 PM
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88rexdxa6ed's Avatar
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From: tacoma, wa, usa
Default why is my si/mpfi conversion dx boggy only sometimes?

when you nail the throttle sometimes my car puke's out bad. it's wierd because it only happen sometimes. does anybody know what it could be? maybe a fuel pump or bad filter?
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Old May 9, 2003 | 08:43 PM
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From: Baton Rouge, LA, USA
Default Re: why is my si/mpfi conversion dx boggy only sometimes? (88rexdxa6ed)

maybe because when you do the MPFI, it runs a little richer than normal...im still trying to get my MPFI to work but i can't get any spark....how did you wire your dizzy?? can you show me step by step cuz i tried following other website directions but it aint working right....holla agp
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Old May 9, 2003 | 09:47 PM
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-16V-'s Avatar
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Default Re: why is my si/mpfi conversion dx boggy only sometimes? (AGPSuperstar)

are you usin the si dizzy?

For my swap i got the si manifold with EVERY THING , the si wiring harness and dizzy..

How did you guys do yours?
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Old May 9, 2003 | 10:55 PM
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Default Re: why is my si/mpfi conversion dx boggy only sometimes? (1991_jdm_sleeper)

everything SI except i used the DX harness because they said it was easier...i just took the plugs off of the Si harness for the injectors and dizzy
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Old May 11, 2003 | 12:06 PM
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88rexdxa6ed's Avatar
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Default Re: why is my si/mpfi conversion dx boggy only sometimes? (1991_jdm_sleeper)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1991_jdm_sleeper &raquo;</TD></TR><TR><TD CLASS="quote">are you usin the si dizzy?

For my swap i got the si manifold with EVERY THING , the si wiring harness and dizzy..

How did you guys do yours?
</TD></TR></TABLE>
i swapped the whole si engine, and then did the mpfi swap. the dizzy wires were really faded so it took me a few minutes to figure them out. if you have the 2 white wires on the dizzy mixed up you won't have any spark.
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Old May 11, 2003 | 12:11 PM
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88rexdxa6ed's Avatar
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Default Re: why is my si/mpfi conversion dx boggy only sometimes? (AGPSuperstar)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AGPSuperstar &raquo;</TD></TR><TR><TD CLASS="quote">maybe because when you do the MPFI, it runs a little richer than normal...im still trying to get my MPFI to work but i can't get any spark....how did you wire your dizzy?? can you show me step by step cuz i tried following other website directions but it aint working right....holla agp</TD></TR></TABLE>

i had to get info from a few different pages because a few of them were wrong. all the dizzy wires should match and the blue/green goes to ecu c 1 and the blue/yellow goes to c 2. are you sure you switched the right wires on the ecu?
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Old May 11, 2003 | 02:46 PM
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From: Las Cruces, NM, USA
Default Re: why is my si/mpfi conversion dx boggy only sometimes? (88rexdxa6ed)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 88rexdxa6ed &raquo;</TD></TR><TR><TD CLASS="quote">when you nail the throttle sometimes my car puke's out bad. it's wierd because it only happen sometimes. does anybody know what it could be? maybe a fuel pump or bad filter?</TD></TR></TABLE>

Well if it never happened before the modification, it's likely something wrong with the changes you made. Did you change the two outside TPS wires? Sounds like what you're experiencing.
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Old May 12, 2003 | 11:49 PM
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88rexdxa6ed's Avatar
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Default Re: why is my si/mpfi conversion dx boggy only sometimes? (Aron Parsons)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Aron Parsons &raquo;</TD></TR><TR><TD CLASS="quote">

Well if it never happened before the modification, it's likely something wrong with the changes you made. Did you change the two outside TPS wires? Sounds like what you're experiencing.</TD></TR></TABLE>

no those wires are right. i used the si plug and wires so the wire colors match up. it runs really good other than a little stumble off of idle every so often. i think i might need a new fuel pump and filter.
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Old May 13, 2003 | 11:37 PM
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88rexdxa6ed's Avatar
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Default Re: why is my si/mpfi conversion dx boggy only sometimes? (88rexdxa6ed)

anybody know what is causing this bog?
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