I recently purchased an '01 Rodeo DOHC V6, automatic with 160k miles.
Whenever I have my foot on the gas (even in neutral) there is a loud whine that seems to be coming from the engine compartment to the left of or directly behind the steering column. When my foot is off the gas the noise stops. The noise is quite loud inside and more noticeable with the windows closed (even at a standstill).
Standing outside the truck with the hood open, the engine on, in neutral and revving the motor, you can barely hear the sound and it's impossible to tell where it's coming from.
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ok what engine is there,? gas or diesel, ill guess, gas.
that symptoms Gob smacks me as, timing errors.
is the cam belt ignore for 6 years. (6x 10k per year, is 60k mile)
that is all part of a tuneup, or doing necessary service on the engine.
the belt slipped,
if you had check spark timing ,it be way off, and that belt caused that.
gen 2, trooper have this line up, 3.2 L 6VD1 SOHC V6
3.2 L 6VD1 DOHC V6
3.5 L 6VE1 DOHC V6
3.0 L 4JX1 TD I4
3.1 L 4JG2 TD I4
i ask every time, and not one ever can figure out whats under the hood. sadly.
the last 2 are diesel...
if you disclose engine that tells the spert, what EFI system is there.
For the 3.2l dohc v6 it is 1,2,3,4,5,6. with the cylinders being numbered from front to back and left to right 1,3,5,right and 2,4,6 left. The left and right side of the vehicle is determined from you setting in the drivers seat
Do a compression test on all the cylinders and see if the rocker arms are adjusted to the right. If the compression is bad then there will be no power at all and if the Rocker arms need adjustments you could be losing some power there too.
You can try cleaning out the engine from the inside out. I have done this many times when I buy a use car. I run Marvel Mystery Oil with the engine oil for about 4 months and keep an eye on the oil level. Marvel is a thinner oil and clean out the inside by removing the carbon collected and oil sludge inside the engine.
You may end up having to replace the oil pressure sensor, it seams to always be the first to go bad and may get some oil leaks. But once the engine is cleaned up you'll have a better understanding on the condition on the engine and be surprised on how well it runs after.
Just keep an eye on the oil level and change the oil and filter to free up the engine, then use the recommended oil and add Lucas oil and or Restor to help the loose of compression.
The loud tapping tells me that your not getting the oil to the top of the engine and that may be a bad oil pump but it may also be a plugged oil pump screen and the Marvel Mystery oil will clean up the oil screen.
Good luck and hope this helps, Keep me posted on your Rodeo.
Hate to burst ya'll bubble but I just got my 2003 lincoln aviator back after I had a front end accident took it in to have the oil changed and check for a transmission service also wanted them to check for a front end noise. Well go figure apparently its in the front differnential in something called the "vista clutch" anway it requires a new transfer case to be purchased. Apparently it runs about $2000 with labor included. Go figure the insurance company wont pay for it after already dumping $8000 in damages already to fix and stated they would not total my truck with 83000 miles on it. Well all I can say is i was told they only go out if they are burnt out from locking the wheels up and skidding and just 1 in a 1000 goes out so I guess we are just he lucky ones. Good luck hope this helps a little also make sure ther is nothing wrong with the gears cause it could create an even bigger problem.. Peace out!