i just swap in a fully built LS VTEC into my 91 si hatch and it died on me on the freeway at 65. it bogged down like i released the gas but it would bog down more when i gave it more gas. it backfires when i try to start it. some say its the fuel filter is clogged. number 2and 3 plugges are normal with fuel smell but 1 and 4 are not. anyone know wat is causing this. the motor has 1400 miles on her, built for drag racing.

 

my computer is a PR3 non vtec, i am waiting for the right computer, PR3 w/ vtec

 

If you turn the key does it start but die right away?

 

no it cranks and backfires

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91LSVTECH &raquo;</TD></TR><TR><TD CLASS="quote">no it cranks and backfires</TD></TR></TABLE>

Timing, set cams to zero. Check cap and rotor. Set distributor timing to stock. Whats fuel PSI?

 

cap and rotor r good, tried distributor timing but nothing, timing is off by like a 32nd not sure about fuel psi yet

 

Are cams set to zero?

 

cams r good

 

Backfiring sounds like a timing issue.

 

It does.... what about the total timing? Is the dizzy set to stock point?