z_again

Hi, I have a 77 280z with a 5 speed in it. I assume the car came with a 4 speed and the 5 speed was put into it by the previous owner. My speedometer is off by about 12% (too high as measured with a GPS). My question is, what is the easiest way to swap the speedometer cog? Can you do it from inside the car through the opening for the gear shifter or do you have to do it from underneath the car? The reason I ask is that I have the center console pulled right now as I am installing the MSA rear speaker panel kit. If it should be done from the top then now is the time to do it. Also, my car is getting the typical fumes in the car. When I pulled the center console I found the rubber boot on the shifter had a nice big tear in it. So replacing that now and will see what happens. This is my first Z with a standard, the previous 3 had autos (so my wife could drive them). One thing I will say is that I never had exhaust fume problems with the autos. Any idea on that? Thanks, Les

Hi, been fixing problems on my car since purchase last March. Here is what I have done. Replaced: plugs (NGK) wires (Nissan) thermostat (Nissan) rotor distributor cap PCV (old one was froze) air filter fuel filter distributor (old one was froze up and vacuum advance leaked, have set timing and am getting good advance now) vacuum lines water temp sensor and connector AFM boot from AFM to throttle body The previous owner had set the TPS to where it was in WOT mode at all times. I believe this was to mask a running lean problem. Once I set it back correctly I have started the following problem. My car now hesitates on acceleration and will fire through the intake which would imply I am running lean. I swapped my AFM with another, no change. I did all the EFI checks per the bible at the wiring harness connector to the ECU and everything looked ok. I put a Summit Racing fuel pressure gauge after the fuel filter. The gauge goes to a little above 36 psi when running the fuel pump without starting the car as per the FSM. With the car started it reads around 31 psi and will go up to close to 38 when revving the motor. However, last night after warming up, the pressure was around 28 psi. My question is: what should the fuel pressure be at idle with the vacuum hooked up? I have found varying values from searching, anywhere from 24 to 28 and 34 to 36 Could it be dirty/clogged injectors? I have checked extensively for vacuum leaks. The car will almost die when removing the oil cap. I have another ECU but have not tried to swap it yet. I still plan on taking the fuel pump off and cleaning the screen. I have not yet adjusted the valves. Any help would be greatly appreciated. Les