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Big loss of power... Backfire?

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  • #1

    Big loss of power... Backfire?

    Flooring it in first gear, once I hit 4500 RPM it "chokes" to pull anymore. I thought it might be in need of a tune up. What do you think? Sounds like a clogged cat or crappy plugs.

    Time to put on those headers and Off road Y, eh? I guess next is the headers and off road Y, plugs and wires.

    Anything else I should replace while I'm in there?
    97 Chevy 'Raro Z28 M6- Ported & Polished LT1 heads,beehives,1.6/1.94 valves, 226/231 custom cam,K&N FIPK, 94-95 BBK shorty's,ORY,Magnaflow Catback,no cats,BMR LCA Relocation Brackets,Lower Control Arms,Adjustable Panhard Bar,Eibach Pro Kit,SPEC Stage 1,Walbro 255 Fuel Pump,30LB Injectors,Pro 5.0,Short stick,MSD 8.5's,NGK TR55's,LT4KM

    01 Honda CBR600 F4i-Two bro's,Corbins,SS brake lines

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  • #2
    Would this do the trick?
    http://www.lmperformance.com/4616/2.html
    97 Chevy 'Raro Z28 M6- Ported & Polished LT1 heads,beehives,1.6/1.94 valves, 226/231 custom cam,K&N FIPK, 94-95 BBK shorty's,ORY,Magnaflow Catback,no cats,BMR LCA Relocation Brackets,Lower Control Arms,Adjustable Panhard Bar,Eibach Pro Kit,SPEC Stage 1,Walbro 255 Fuel Pump,30LB Injectors,Pro 5.0,Short stick,MSD 8.5's,NGK TR55's,LT4KM

    01 Honda CBR600 F4i-Two bro's,Corbins,SS brake lines

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    • #3
      Wait scratch it all.. Can I just get an offroad Y for this car? I can't find one. They seem to skip over the 96-97 years everywhere.
      97 Chevy 'Raro Z28 M6- Ported & Polished LT1 heads,beehives,1.6/1.94 valves, 226/231 custom cam,K&N FIPK, 94-95 BBK shorty's,ORY,Magnaflow Catback,no cats,BMR LCA Relocation Brackets,Lower Control Arms,Adjustable Panhard Bar,Eibach Pro Kit,SPEC Stage 1,Walbro 255 Fuel Pump,30LB Injectors,Pro 5.0,Short stick,MSD 8.5's,NGK TR55's,LT4KM

      01 Honda CBR600 F4i-Two bro's,Corbins,SS brake lines

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      • #4
        iam having the same kinda problem... i changed plugs, and new wire set.. didnt work, but helped.. I was thinking of changing the coil packs or the ignition module soon..

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        • #5
          I'd definetly check the opti. Many times what you described about the loss in power around 4500 rpms is a good sign of the opti. How many miles on the car?
          1994 Firebird Formula, M6, Fan switch, 160 thermostat, Pacesetter LT headers, Morosso CAI, TB bypass, True duals.

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          • #6
            85K on the car. Think it's the opti? How much to replace that and how difficult is the job?
            97 Chevy 'Raro Z28 M6- Ported & Polished LT1 heads,beehives,1.6/1.94 valves, 226/231 custom cam,K&N FIPK, 94-95 BBK shorty's,ORY,Magnaflow Catback,no cats,BMR LCA Relocation Brackets,Lower Control Arms,Adjustable Panhard Bar,Eibach Pro Kit,SPEC Stage 1,Walbro 255 Fuel Pump,30LB Injectors,Pro 5.0,Short stick,MSD 8.5's,NGK TR55's,LT4KM

            01 Honda CBR600 F4i-Two bro's,Corbins,SS brake lines

            Comment

            • #7
              i had the exact same problem about a month ago and sure enough it was the opti. I only had 70K on my car so it very well could be.
              1994 Camaro Z28 Bolton's, stall, 275 nitto's - SOLD
              1998 Camaro SS looking for 120+MPH N/A

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