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Whilst driving on the highway the vehicle just shot off no power. what can possibly be the cause. first we thought it ws the fuel pump but that is working and now the mechanic is saying the brain can possibly be gone. this is a honda crv 2008 model
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Possibly the throttle body is dirty and clogged and not allowing proper fuel. Possibly bad fuel pump causing low fuel pressure. Possible problems with the exhaust system (clogged muffler or catalytic converters). Are you getting CEL (check engine light) when this happens?
If you have done basic tune up stuff, I would check fuel pressure with gauge installed and running down the highway. Other possibles are bad ignition module, loose wire somewhere in coil circuit, bad fuel pump, filter, many others.
The drivability issue you describe has a multitude of possible causes. The best advice I can give you is that you take/tow the vehicle to the local/nearest Hyundai Service Department and have it properly diagnosed. Possible causes: #1. Fuel delivery (Fuel Pump pressure, Injector(s) clogged/leaking) #2. Vacuum Leak(s) #3. Faulty Throttle Position Sensor (TPS) #4. Electrical (Wiring) #5. Faulty Sensors (Crank Position Sensor, Cam Position Sensor, Idle Speed Control Actuator, Faulty Manifold Absolute Pressure Sensor, etc.) #6. Contaminated Fuel #7. Faulty Powertrain Control Module (PCM) Best advice, get is properly diagnosed.
Sounds like you have a fuel issue. It could be a fuel pump cutting in and out. It could be fuel pressure regulator, or an injector not spraying correct. I think it's time to find an honest educated repairman.
your fuel pressure between 30-35psi is showing good at the moment. If you due suspect bad fuel pumps try and drive the vehicle with the fuel pressure gauge attached to monitor if it does drop when driving. Also make sure you have spark at all the spark plugs as a bad coil or a bad spark plug connector could be bad. They are available separately. You can also confirm this by doing a resistance check across the ignition wires. The ohm value should be printed on the spark plug connector. Generally they are about 2k ohms. No spark at one cylinder could cause the same symptoms but usually sets a code. The fuel pump will usually sound louder then normal when they are about to fail. Since there are two fuel pumps for the vehicle it is possible one of them is starting to fail. The throttle actuator can also cause drive ability problems but will generally cause the ASR light to come on. I would also look at the distributor caps and rotors as a potential cause as they can cause your symptoms with no check engine light. If possible drive the car with the fuel pressure gauge attached to monitor fuel pressure and with the engine at idle start pulling the spark plug connectors off and on to make sure the engine stumbles every time. Let me know what results you get and I will try to help further diagnose the issue.
Shouldn't cost much for 10 minutes work to test fuel pressure & confirm pump condition, but do it when vehicle 's been running for a while, long enough for pump to get heated up.
Sounds like a possible fuel pump problem...When they begin to go bad they will overheat and lock up, then work fine for a while and do the same thing again. By changing the filter you lowered the flow resistance and allowed the pump to work a bit easier but still being bad, it did the same thing again. There are other things that can do this as well, but pump is most common.
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