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.
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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.
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
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.
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.
The shop saying there was a Freon leak should have other ways to diagnose a leak other than a dye test. If they charge it & it leaks out.......YOU BOUGHT IT. The diag should be done in one visit.
Check that the cooling system is fully serviced (near full mark in coolant reservoir). With engine warmed up, feel (carefully) both heater hoses where they go into the firewall. If both are hot, there is water circulating through the heater core - possibly problem with blend door actuator. If only one hose, or neither hose is hot, you may have a blockage in the heater core. This usually means replacing the heater core, but you may be able to flush it. See this YouTube video: https://www.youtube.com/watch?v=M9SIafVsqyc
free wiring diagrams http://bbbind.com/free_tsb.html Enter vehicle info . System - click on engine , subsystem click on fuel controls . Click search button . Click on blue links one at a time till you fine fuel pump wiring diagram .
You will need specialized tools for this procedure. Certain timing alignments have to be performed be for installing some of the components. Get it to a shop that has those tools. Not for the home mechanic type of job.
