There is a repetitive ticking noise coming from under my hood. It's most prominent when I idle, and stops immediately when I step on the accelorator. My gas mileage has dropped by at least 20 miles to a tankk of gas since this began.
I kind of had the same problem with my car, the dealer kept saying it was nothing wrong with the vehicle and that the ticking noise would fix itself electronically. Wrong, it was my valves needed adjustment and that ticking noise was never going to be fixed electronically.
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Prognosis is really bad, hate to tell you. Ticking comes from the valve lifters, losing lubrication due to lack of pressure and running dry. At redlights, when revs are at idle, oil pressure drops a lot, and engine really suffers. Have the vehicle taken immediately to a shop for proper diagnose and to see if engine can still be saved. The loss of power comes from the valves not actuating properly. Hydraulic lifters need oil at a decent pressure to "charge" , and if not charged, they will stay compressed, ruining valve lifting operation.
First, I would have a dealer run the Vin# for your truck for the Cruise Control recall. If the recall was not performed it needs to be done. Unfortunately after some of the earlier recalls were done, people had problems with the 4x4 controls and brake lights.
If you can identify the Cruise Control and there is an add-on fuse disconnect the fuse and see if the ticking goes away.
In your case I would spend a little time to save money and use your hands to find the ticking relay.
Your fuse block should be under the dash or behind a kick panel. You will see some oblong or square relays. Feel them and unplug the ones that are ticking. Keep track of their position.
Under the hood are some black power boxes filled with relays and fuses. Do the same "Feel" test on them. When you unplug the "problem" relay the ticking noise will stop. Then the problem area will not work and you can investigate the equipment on that branch. Be it power windows, wiper delay, A/C,
power seat, and so on.
If you have a Diesel your Glowplugs have a timer which is very loud and should stop in less than 90 seconds. It definitely pulls power. Do a "feel" test on it. Your glowplug wires will lead you to it.
Ok, i find it very hard to believe that this car came from the factory with an unset valve assembly and, i don'tbelieve that it would have been delivered to the dealership with some bad injectors. I agree. this car smells like lemon pie and i would seriously think about practicing your states lemon laws. This car was dead on arrival unfortunately. there is nothing normal about a ticking sound coming form under the hood of a new car. I work on Lexus's and I've never herd any kind of ticking that was considered to be normal. Your intuitions are correct. i would return this vehicleimmediately. I must say, if the ticking sound is very low range and is coming from the injector areas, this is normal but, if its very noticeable, its not.