5300 storage high rev engine

1. Throttle control problems: A sticky throttle control or a malfunctioning throttle position sensor could be causing the high revs.
2. Ignition system issues: A faulty ignition module or spark plugs could cause the engine to run rich, causing high revs.
3. Vacuum leaks: A vacuum leak can cause the engine to run lean, leading to high revs. Check for any visible leaks in the vacuum lines and hoses.
4. Fuel system problems: A clogged fuel filter, a failing fuel pump, or a malfunctioning fuel pressure regulator could cause high revs.
5. EGR valve: A clogged or sticking EGR valve could cause the engine to rev high.

It's recommended to have a professional mechanic diagnose the issue using an OBD-II scanner to retrieve the error codes and perform a proper diagnosis. Based on the error codes and the symptoms, they can determine the root cause of the problem and recommend the necessary repairs.

The service and repair manual will provide you step by step help to locate and fix the problem easily on your own and you will get the manual from the given link https://toolsnyou.com

If you hit the Rev Limiter on a Ford, it will simply bounce the rev back down, to protect the Engine. So, no high Revs. But, you should be able to bring it slowly to a High RPM. That is normal. If there are no Check Engine Light on. You are most likely hitting the rev Limit and need to stop.

Do you have a check engine light on? Are you saying that the engine idle speed is excessively high? If that is the case have you checked for intake manifold vacuum leaks?

misfires are for faulty electrics ---plugs, HT leads, distributor coils ECM but they are also from low fuel pressure , faulty injectors, faulty injector wiring
now you say at 5300 rpms is at the top end range so items to check are the fuel pressure ( should be at around 55-65 psi constant) fuel flow (filters , EVAP venting problem
Plugs with excessive gap, Low quality HT leads or faulty leads --excessive resistance is stopping spark at high pulses
ignition control module --failing at high cycles and coil or coils not good enough to handle the high cycles
If you have a distributor , then it may be worn bushes in the distributor that is initiating the misfire by not running true in the housing causing the rotor button to be missing spark for certain leads

There are alot of factors that could prevent the engine from revving over 1500RPM. Some sensors like the crank angle or cam angle have to be connected in order for the engine to even start, other wiring loom plugs like the turbo controller need to be connected or the car goes into limp mode and it won't rev past a certain point.

Then there are the automatic throttle controller area wiring loom type plugs near the inter cooler, sometimes people forget to put them all back and the engine won't rev high. Making sure the vacuum pipes in this area are all connected properly, one unplugged pipe, no vacuum, the injector pump relies on the vacuum system and if it doesn't work then not enough fuel delivery, engine can't rev high. Also if the fuel rail is leaking or if the fuel filter is clogged then engine won't rev high.

Is it misfiring or is the high rev limiter kicking in? Mazda's are not high rev engines even with the ford engine in it! mine idles at 750 +/- and hits 2500 at 75 MPH if I punch it it will go to 3g but not much higher.

Good luck

No driving will only further damage the parts that are bad and could damage other parts making it even more costly. and it sounds like tranmission problem.

it will idle high with air con on and revs will go up and down try turning air con off it that fixes it then there is no problem

sounds like the sensor module