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Sounds like excess bearing clearance, when the engine sits overnight the oil between the bearings and the crankshaft is able to run back into the oil pan. When you first start it up it takes a few seconds for the oil pump to fill the spaces back up and you get some clatter.
yeah, it does sound like dirty fluid or even that solenoid, which is usually the shifting culprit, you might want to stay away from changing that valve tho, it is very involved, and the valve body has to come off, which there are two bearings which govern the direction of fluid flow, so stay away from that, just do what you can do which is the filter and the solenoid. you'll be fine.
i have a 1997 honda accord ex. i have a knocking noise in the front end up to 25mph and goes away until you hit about 55mph then it comes back but it also goes away with the slightest turn of the steering wheel. what could this be? please help me, i been stuck on this for 5 days now. thanks.
Generic OBD Error Code Details for P0798Pressure Control Solenoid "C" Electrical
What does this mean?OBD Code P0798refers to The Engine Control Module (ECM) uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th or 5th gear). Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical troubles of the shift solenoid valves and valve body.
SymptomsPossible sumptoms of OBD code P0798 - Engine Light ON (or Service Engine Soon Warning Light) - Shift shock
CausesPossible causes of OBD code P0798 - Low transmission fluid level - Dirty transmission fluid - Faulty pressure control solenoid valve - Pressure control solenoid valve harness or connectors - Pressure control solenoid valve circuit is open or shorted The Error code is generally activated on detection of the following conditions: The P0798 is triggered when the ECM detects an open or short circuit in shift solenoid valves
Possible Solutions
Next itme you hear it, get out and see if it loader on top or the bottom of the engine. This sounds like typical rod knock. especially when it goes away when you add oil. This would be a rebuild or engine replacement.
Could be a starter sticking but that would cause more of a grinding noise, my best guess is that your flex-plate(flywheel) is broken if the noise is coming from between the engine and transmission. Remove the access cover for the bell housing and take a look at the flex-plate.
1st Scenario The noise you are decribing can be from the driving gear from one of the electric motors could be worn down in which case you will have to get it replaced the best place to get a cheap second hand one is at a scrap yard.
2nd Scenario If the trunk still wont open then the loose cable you are describing has snapped you will know witch cable because if the roof lid is open check for a button on one of the right lid catch which tells the car the roof lid is now closed and secure so the trunk is now allowd to open. If this is the case replace the cable.
To alastair bda if this does not solve your problem I have sent you an e-mail with further questions to investigate your noise problem. I will be waiting on your reply.
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