I am looking for any suggestions to solve a fault I have with my Accord Tourer 2.2 EX. A few months ago, it started to exhibit an occasional fault where the engine would rev to 2700 rpm and then temporarily cut out for a fraction of a second then resume at a slightly lower RPM. If the accelerator pedal is kept depressed, this fault cycles, but generally doesn’t produce an engine fault warning light.
The car starts instantly as it always has, has good power, performance and fuel economy up to approximately 2700 RPM. I have driven the car fairly long distances (200miles+) without issue if the 2700 rev ‘limit’ is observed.
If the revs are allowed to increase very slowly the fault will occur slightly above 2700 RPM and the engine management fault light illuminates giving a P0039 fault (Crankshaft Position Sensor Intermittent Interruption) is displayed. If moderate acceleration is used the fault occurs at 2700 and no fault is displayed. If the accelerator is ‘floored’ the fault can occur at a slightly lower RPM, but again no fault light is displayed and no fault logged.
Thinking that the P0039 error may be a faulty crankshaft sensor (CKS), this was replaced, but did not solve the problem.
The car was taken to a main Honda dealer who could not diagnose the fault, but undertook a ‘data capture’ and sent it to Honda UK who could not suggest a remedy, but suggested possible ECM or injector faults.
The mileage is currently 190k, but was remapped at 100k. Recently the ECM was reverted back to a standard map with no change in the symptom.
I have had the timing chain and tensioners checked and these are fine. I have also looked at the earth continuity between the engine and chassis and this is also OK.
The next step will be to check teeth measured by the CKS to see if there are any chips or teeth missing, but I would have thought this would affect running at lower RPMs.
Any thoughts as to what might be causing this?