2004 Pathfinder 3.5L
I have recently been hit one minute to the other with the vehicle loosing response to throttle application.
The vehicle gives a jump when I first press the accelerator and then dies off to idle again. I can repeat this process a few times before it stops responding and returns to idle (700 rpm, down to 500rpm but rougher idle) and I will coast only with the power of idle speed (automatic)
I have recently replaced the battery to a 100 amp, rebuilt the alternator and replaced the fuel filter.
a mechanic hooked up a computer to read the codes, there was 'low battery' and a 'high voltage' code. I understand the low battery, it was put in discharged for a day but the high voltage? He hooked up a tester voltage tester to the battery (after it had been charged), read 17.5 v, that was at idle speed with the engine. this was when the vehicle was not responding well with the throttle. The tester the guy had was digital.
The next day the truck starts and responds perfectly to the pedal, I go to another mechanic with all needle testers (analogue), this tester read right at ideal, 14v idle. we reved the engine to a constant 3000 rpm and the needle didn't jump much higher than about 15.5-16v but would normalize.
Could this be a problem with the voltage regulator in the alternator? This was replaced with the alternator rebuild to a new one. The alternator tested at about 14.6v just after the rebuild, I wish I could tell you was it was beforehand...
Any suggestions would be great, thanks!
The throttle body on my vehicle is electrical, with a sensor at the pedal and throttle b. I opened up the thottle and there was a but of oil gunk but nothing serious. The throttle control motor is sealed in a plastic cover on the side of the throttle body chamber.
Might the problem be with either of these pieces (pedal/TB), and how could I diagnose which one it may be?
If there is any info which I am may be missing, please ask