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Message: <blockquote data-quote="hakimsutar" data-source="post: 3686761" data-attributes="member: 65545">Hi, all brader n shifu...Yesterday while I drove my car suddenly the car can't rev over 4000 rpm. (If I press the padle the rev can't go up and the engine just bbrrrrp...)Today I've done this job one by one:- check all tubing n hoses (ok)- check all intercooler piping (ok) - change the spark plug- test the O2 sensor from another ER34The problem still not solve.After that I reliased the fuel press drop from 30 to 20 psi.- changed the standard fuel pump to walbro pump. The fuel press went up to 40 psi but after about 30 sec it back to 20 psi.Checked power supply for the fuel pump, 12.2V after started the engine but went down to 5.9V after 30 sec running.Took direct power supply from battery to fuel pump - also the sameChecked the earthing for the pump - not enough. Put direct earthing cable from pump to car body and it's work. The fuel pump supply mantain at 12V and press mantain at 40 psi but the problem still not solve.Changed the fuel pressure regulator -problem still not solve. My question :1) What is the PROBLEM - can't rev up.2) Fuel pump earthing not enough. *my er34 all in stock except the intercooler.I have no idea what else to do.... Help please.......</blockquote>

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