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Old 03 May 2006, 07:07 pm
ReDevil
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Default 92 Civic HB VTEC swapped NEED HELP!


I have a 92 Civic CX(1.5 8v), swapped to a 93 Civic EX (1.6VTEC). The car runs like a champ on the lower cam, but as I top out vtec about 1000rpm before revlimit (7100 I think...) it starts to pop and skip, and my tach jumps like crazy. I unhooked the tach and it is less noticeable, but it still does it. The car has the basic bolt ons, an exhaust, an intake, 9mm wires. I already tried a different distrubutor, different wires, cap, rotor, everthing I can think of. DOES ANYONE KNOW WHAT IS WRONG, I REALLY NEED TO FIGURE THIS OUT

Thanks, Rya

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Old 04 May 2006, 09:08 am
jim beam
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Default Re: 92 Civic HB VTEC swapped NEED HELP!

ReDevil wrote:
> I have a 92 Civic CX(1.5 8v), swapped to a 93 Civic EX (1.6VTEC). The car runs like a champ on the lower cam, but as I top out vtec about 1000rpm before revlimit (7100 I think...) it starts to pop and skip, and my tach jumps like crazy. I unhooked the tach and it is less noticeable, but it still does it. The car has the basic bolt ons, an exhaust, an intake, 9mm wires. I already tried a different distrubutor, different wires, cap, rotor, everthing I can think of. DOES ANYONE KNOW WHAT IS WRONG, I REALLY NEED TO FIGURE THIS OUT.
>
> Thanks, Ryan
>
>

dumb questions for you:

1. are you running nitrous? it affects ignition.
2. did you swap ecu's? the ex ecu has different red line. if you're
running up against the rev limiter on a cx ecu, symptoms are exactly as
you describe.
3. is the timing belt adjusted properly? slop in the belt means cam
timing is wandering back & forth all over the place. with the extended
overlap on the high rev cam, that can cause problems.
4. you say your [presumably after-market] tach affects this situation.
what other electrical mods do you have? electrical noise can easily
cause major issues.
5. are you running the stock ex ignition/distributor?
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