It's possible that the 2004 Ford Ranger's engine or the tachometer itself is to blame for the difficulty you're describing with the tachometer reading. A crankshaft position sensor issue is one typical reason for a tachometer to read high. To determine the engine's RPM, this sensor transmits signals to the engine control module (ECM). The tachometer may show a reading higher than the real RPM if the sensor is broken.
There are several possible causes for this issue, including a problem with the tachometer itself, a problem with the sensor that sends information to the tachometer, or a problem with the vehicle's electrical system. It is also possible that the tachometer cable is loose, damaged, or disconnected.
It's recommendable to take your truck to a professional mechanic to diagnose and fix the problem. In some cases, the problem might be fixable by replacing the sensor or cable, but in other cases, it may require more extensive repairs or replacement of the tachometer itself.
It's also important to note that even though the tachometer is not working properly, it does not affect the performance of the engine, but it will give you a wrong idea of the RPM, which could lead you to over-rev the engine and cause damage.
One of several possibilities. The first is one is one that I have seen at weddings and other celebrations. A friend thinking it is funny will put a wire hooking the two systems together so when the lights go on, the horn honks. That being said, I would look at the wiring to make sure the did not melt together is they are close to a heat source. Also a possibility, the clock spring in the steering column may be shorting. The combination switch could also be problematic.
the inertia switch is only supposed to trip in the event of impact, so unless you are off roading or otherwise jolting the vehicle - the switch may be failing.....
Fuse #20 is refer at Anti-lock Brake System (ABS) module, Brake-shift interlock, Speed control module, Back-up lamps, Overdrive cancel switch, Electronic flasher (turn/hazard), according with the2004 Ford Ranger Owner Guide.
You will need to check and test all the circuits involved in this point, siwtches, sockets and wires; since this fuse is blowing constantly, one short is located in some circuit. I will disconnect all those components one at a time and road test.
Well you can remove the sensor in the diff and make sure that looks ok they g obad quiet often also woulnd not hurt too remove the rear diff cover and inspect the rear end if it is whining and you dont see anything wrong i would refill it with lucas oil/grease and start praying check the pinion too and see if it has any play in it
try getting a manual from www.reliable-store.comit's very helpful in repairing info
or try manualslife.com
very good online places, makes repair much easier
Surge usually means its getting extra air (VACUUM) from somewhere, usually a vacuum hose has come loose or developed a hole or crack letting extra air into the engine.
Make sure the belt is tight. You can try spraying some belt conditioner on the ribbed side with the engine running. It can also be pulley bearings--especially the idler. Try spraying a little oil on the accessory bearings with the engine running. If the chirping stops where you spray, replace that part.
you should go and find an accredited service shop as the mechanic that advised you on new head is touching your wallet
most misfires are from faulty injectors and in many instances a quality injector cleaner will fix the problem
Check engine light . Your best bet , take it to a qualified repair shop . Special testing needs to be done to determine what the problem is . Bulb or the insturment cluster .
Make sure your system is charged properly. Also make sure your cooling system is properly clean and filled up to max levels. Sometimes low freon or old cooling system fluid will cause a delay in the A/C to work. Also chech to see if there is any black powder around your A/C clutch, if so, this is a sign that the system is about to go out of service. You can get a great deal on the part from Amazon.
