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Message: <blockquote data-quote="k0pi" data-source="post: 1064500671" data-attributes="member: 117648">hey bro jebatdex - have you tried sudden flooring to accelerate and getting fuel surge or bigger jerks (floor wide open throttle at 3000rpm and let it accelerate to 6000rpm) in 3rd or 4th gear? If you do... then that's the fuel pump problem. It does start with these small jerks first coz the fuel pump may sometimes stop momentarily.... and this is on stock Mikuni throttle, fuel regulator, ECU... if you decided to change the fuel pump, don't go for the cheap ones usually sold between RM120-160 and do buy from Proton Parts center coz there's many-many-many shop now selling fake denso pumps (irritatingly 100% looks the same as the original) that'll phucked up less than 2 years and worse - they don't deliver 110lph flow - less than that. Original Proton-denso pumps may last until 15yrs and support 102lph good for upto 150hp NA application tuned with 240cc injectors (4g91/92/93) wthout getting leaned out. Cost of the ori pump is RM230-250/unit. other than that if you're getting the small jerks throughout all RPMs till redline (soft or hard accel) wthout the a/cond turned on (jerks frequently if AC on) but doesn't experience big jerk like the engine starving for fuel - just small bumpy jerks even if you throttle down 100% to redine, its the crank pulley due to the rubber lining at wrapped around the center of the pulley has weakened (like mounting bush) and may have been able to shook, causing misstiming - and the jerks won't happen when the engine is still cold or newly warmed. But this problem may lead to bent valves (starting with valve seal damage) on long ignore. Cari pulley kedai potong sudaa... new OEM ones... think it costs 400 bucks? can't remember... other than that if you or someone have touched the TPS sensor and tweaked it before / or you've got new throttle body - get someone to tune it back wth a multimeter/ohmmeter. to get the correct TPS value at 0.48/0.49/0.50V (0.490V the best for 4G92p). Sometimes the TPS wrong adjustment causes jerks too because it controls the behavior of the injectors (close/open frequency = amount of fuel vs. amt of throttle given) and the igniton timing. Not only that... correct TPS tune may give your 92p good fuel consumption averaging 13km/L at least and loads of low-end torque... if its stock. First diagnose for this - reset the ECU. The jerks wont happen the first drive after reset. not really sure about the ECU logic tho... other than that.... can't brain edi... those jerkings are pain in the arse to solve...</blockquote>

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