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Ok first of all You don't Have a CARBIE. This is a fuel injected motor. If You are getting Blowback through the intake then You jumped timing or bent a valve. Take it to a Professional
Is there anything after market installed in the car? Alarm, radio, mobile video? The speedometer works off of reading voltage, a coded signal. Sometimes if something is installed, it could pinch the wire, be tapped into the wrong wire. If that is the case, take back to get looked at. If that is not the case then you may need to see a mechanic.
After I had the throttle body of my 2005 mazda3 cleaned, the RPMs would jump drastically - bouncing back and forth up to 16 times! The service manager seemed perplexed...and ultimately the solution was TIME. The bouncing gradually diminished and then stopped...can't remember for sure, but it was probably over about 6 weeks, maybe about 1000 miles.
hello I am having a issue with my santa fe diesel and currently suspecting that the oil that the service center is using is a generic oil used in both diesel and petrol engines. I am suspecting that the oil is too thin and causing compression in the cylinder issues and can be seen under load on low revs and very little responsiveness from the accelerator and at times the engines misses and has at one point stalled. You may also hear that the engine rattles on acceleration. I am going to experiment in putting in an oil particularly for diesels only and see if that makes a difference. I topped up 500ml before the last service on a 5w-40 diesiel synthetic oil and that seemed to make a big difference. I am guess 5w-30 will be better choice but did not have that sitting around at the time.
Be interested if anyone else experiments with an oil change and it works.
Engine performance problem causes are many. Try this first.
1. Disconnect the battery cables (both of them)
2. Touch/connect the postive and negative battery cables together for 30 seconds.
3. Reconnect the cables to the battery.
4. Drive vehicle to see if this solved the problem. Let me know what happens.
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