Then if still no error found you need to check the ECM. It controls the ON/OFF fuel pump relay, which in turn controls the fuel pump." So what the means is that you need to check your pump, the relay after that the POS and the camshaft position sensor as well as all the wiring in between. The spark plugs on your Nissan Altima receive the electrical charge from the ignition coil so they can create the spark that causes combustion. The ECM does not directly drive the fuel pump. The ECM stops pump operation and prevents battery discharging, thereby improving safety. If the engine speed signal is not received when the ignition switch is ON, the engine stalls. If the ECM receives a engine speed signal from the crankshaft position sensor (POS) and camshaft position sensor (PHASE), it knows that the engine is rotating, and causes the pump to operate. The ECM activates the fuel pump for several seconds after the ignition switch is turned on to improve engine startability. Now here is how it all works according to the SM:" ![]() Mitchell1 you are not telling us what you have checked regarding the fuel situation. Ecu does connect and communicate perfect. These all pulse the grounds and are triggered by the ignition pulse. pin 102 (1 inj) red and black, pin 107 (2 inj) yellow and black, pin 104 (3 inj) green and black and pin 09 (4 inj)blue and black. Coming off the ECM, are four wires which are numbered as followed. Coil packs have power and ground but not seeing anything from ecu triggering the coils. ECM makes and breaks the ground to pulse the injectors. Ive checked the timing and had my father double check all work (20+ year mechanic) He confirmed that I was on the money. And its also not starting with cam sensor unplugged. When I am on the highway, the RPM are at 2500-2700 at 60 MPH and I have noticed my fuel economy getting a bit worse. My 2005 Nissan Altima 2.5 seems to not be shifting into 5th gear. Sure enough, we were missing the O ring that goes there. It has ignition 12v power going to it, but nothing - Answered by a verified Nissan Mechanic. However it started after unpluging the cam sensor and ran perfect unless you gunned it (I thought maybe the vvt solenoid wasnt getting oil pressure). ![]() After replacing the gasket I tested compression and had no issues there. Prior to replacing the head gasket we replaced the injectors, coil packs, spark plugs, o2 sensors, cam sensor. maybe 8 hours of total worktime to complete. I replaced that myself as the dealer wanted $2000(14 hours) for the job that took me. If you consider 0.044 inches as nominal, the actual gap you will have when installing the plug will probably vary by 0.001 inches. ![]() Some people like to gap a couple of thousends off stock either way. Had missfire issues from blown head gasket. 0.043 to 0.045 (depending on the math done in the SI to English conversion from the factory specs) is the stock gap regardless of platinum or copper.
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