I know this has been covered in previous posts, ive tried all fixes but still have problem. Navara d40 2008 6 speed manual 130000 kms. the rev counter surges when depressing accelerator. changed air filter,fuelfilter all vacumm hoses . cleaned egr, and replaced scv and reset ecu. after replacing scv there seemed to be an improvement. but this morning its doing it in all gears. there is plenty of power when the revs are up,seemed like there was more power after replacing scv. any help would be appreciated . Also not showing any codes.thanks Mark.
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is the computer in the engine bay?
top and back of driver side
check the connections on that - the clips are plastic swing over clips - may be loose
try cleaning the earths - battery earth, block whereever else you can find one
top and back of driver side
check the connections on that - the clips are plastic swing over clips - may be loose
try cleaning the earths - battery earth, block whereever else you can find one
Welcome to the forum.
The idea about earths is a good one, and there's more than just the ones in the engine bay. Apart from the ECU earth (against the guard on the vehicle right side, just forward of the ECU itself), there's also the battery itself (clean both posts and do a continuity test on the fusible links while you're there) and the negative battery connection to the engine block.
Now, before we go further: do the engine revs actually rise (can you hear the sound of the engine revving harder) or is it just the tacho telling you the engine is revving harder but the engine note has remained the same?
If the engine is actually revving harder, you might have a slipping clutch. 108,000km isn't bad for a clutch, we've heard of some failing in 20,000 and 30,000km (vehicles were used for towing). Many replace the flywheel/pressure plate and clutch with an EXEDY HD unit.
If the engine is NOT actually revving harder but the tacho is rising, you might have a bad earth for the instrument cluster. This shares the earth with the audio unit and has often been the cause of mysterious glitches in the instrument cluster. The simple solution is to run a separate earth to the stereo by connecting a wire from the stereo framework to one of the under-dash mounting bolts (not a screw, but one of the bolts that connect to the main bodywork).
The idea about earths is a good one, and there's more than just the ones in the engine bay. Apart from the ECU earth (against the guard on the vehicle right side, just forward of the ECU itself), there's also the battery itself (clean both posts and do a continuity test on the fusible links while you're there) and the negative battery connection to the engine block.
Now, before we go further: do the engine revs actually rise (can you hear the sound of the engine revving harder) or is it just the tacho telling you the engine is revving harder but the engine note has remained the same?
If the engine is actually revving harder, you might have a slipping clutch. 108,000km isn't bad for a clutch, we've heard of some failing in 20,000 and 30,000km (vehicles were used for towing). Many replace the flywheel/pressure plate and clutch with an EXEDY HD unit.
If the engine is NOT actually revving harder but the tacho is rising, you might have a bad earth for the instrument cluster. This shares the earth with the audio unit and has often been the cause of mysterious glitches in the instrument cluster. The simple solution is to run a separate earth to the stereo by connecting a wire from the stereo framework to one of the under-dash mounting bolts (not a screw, but one of the bolts that connect to the main bodywork).
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