Last post on Oct 31, 2010 at 12:00 PM
You are in the Toyota Tacoma
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Toyota Tacoma, Truck
#161 of 547 Groaning Noise and Low Power at High Ambient Temperatures!?!?
Aug 01, 2003 (7:12 am)
I'm looking for information on an issue that I (and others) are seeing on 2003 V8 Toyota 4Runners. I thought I'd check with other discussion groups to see if this issue is present on other 4.7L V8 equipped Toyotas. This includes: Tacomas, Sequias and Landcruisers.
A groaning noise, especially apparent when reving the engine. Also a distinct loss of power. More noticeable when climbing steep hills or accelerating.
When it Occurs
Only when ambient temperatures reach into the upper 90s and above. At lower temperatures the vehicle behaves fine.
The fan clutch reacts to ambient temperature and slips when cooling is not needed. It locks when more cooling is necessary. When it locks, the rpm of the cooling fan is higher, thus the noise. This is not new technology and has been utilized for years. It is called a viscous clutch mechanism.
The theory is that the viscous clutch is locking up at the higher ambient temperatures, causing the fan to spin faster.
This accounts for the noise and the power loss. Several subscribers have experience with this in other vehicles and point out that when the viscous clutch locks-up the fan takes a tremendous amount of power from the engine.
There has been on-going discussion on the Edmund's discussion group titled "Toyota 4Runner".
Other V8 Equipped Toyotas?
If other V8 equipped Toyotas do not display this behavior, then I would speculate that maybe there's something different about their cooling systems. Maybe the 4Runner, being smaller, didn't have as much room for as big a radiator. Maybe they compensated by using a viscous clutch with a lower "lock-up" temperature???
What experiences has anyone had with anything like this on any 4.7L V8 equipped Toyota?
#162 of 547 Car seats and the extended cab
Aug 02, 2003 (10:22 am)
I'm thinking about getting a '01 tacoma extended cab. Now the problem I have a 3 year old who needs a car seat. Has anyone put one in the extended cab version? Your opinions would be helpful.
I would like the 4 door, but they are spendy. Once again, any help would be helpful.
Aug 02, 2003 (9:17 pm)
my son borrowed my '00 Tacoma last week and got hit right behind the driver's door. dumped it over onto the passenger side. hood and tailgate were fine, but all other sheet metal was trashed. yup, totalled. but they crawled out the window, pushed it up on its wheels, and drove it home. driver not hurt and passenger had minor cuts from broken glass. yes, very lucky. i looked at new rangers and tacomas today. i've had both and loved them both. i'll probbly buy from the first dealer that finds me a comfortable bucket seat.
Aug 04, 2003 (7:06 pm)
While I haven't actually put a child car seat in the back of my 2001 ex cab Tacoma, it has what appears to be a very substantial anchor factory installed for just that purpose. Check the owners manual if possible.
Aug 05, 2003 (3:59 am)
You have got to be awful happy about your son. We all worry about that kind of thing, and he was very fortunate. If you are looking for a comfortable seat in a Tacoma, you will need another shot of good luck. There are, however, some great after-market seats out there.
Sep 02, 2003 (7:25 pm)
My best friend just traded a 1986 Ford F-150 4WD in on a new 2003 Toyota Tacoma SR-5 4WD 5 speed Manual. He is surprised that the new Tacoma 3.4L V6 has much more power than the 5.0L V8 had in the Ford.
Question: Why does the 3.4L V6 in the Tacoma have LESS power than the smaller 3.3L V6 in the 2004 Toyota Sienna? (The Sienna 3.3L V6 has 230 HP and 242 Lb-Ft Torque while the larger 3.4L V6 in the Tacoma has only 190 HP and 220 Lb-Ft Torque).
Will the Tacoma 3.4L V6 last longer since it is not tweaked as much for power output?
#167 of 547 What does power curve look like for
Sep 03, 2003 (6:51 am)
Sienna engine? Truck engines have a requirement to develop most of their torque in lower rpms, so they can tow. Sienna engine might simply be developing the torque much later, at a very high rpms.
Sep 03, 2003 (8:10 am)
Hello All!! I Just bought a '03 x-tracab 4x4,manual. it now has 1300 miles on it and i am going to get the oil changed to full synthetic. Here are my questions. I thank you in advance to ALL people who may answer my questions, and i apologize if they seem somewhat trivial. I just want to take care of "Gunner" the best way possible
1)If i am using FULL synthetic oil is it ok to change the oil every 5k miles(norm driving conditions)?
2)I am looking at buying some good quality car seats and a tonneau cover--any recommendations or websites?
3)I also am looking at having the bed lined with the spray on "Rhino" lining(approx $430.00)--any opinions?
4)What should I keep the tire psi's inflated to? Some people say 32--but i believe the tires say 35 or 36 psi??
5)Should i be driving 4Hi at least 10 miles monthly. And if so, can I drive in 4HI on dry pavement w/out ruining anything?
Thx again. I really enjoy reading all the posts!
Sep 03, 2003 (11:10 am)
I don't know the answer to all your questions, and the oil question can get more than one answer (my personal thoughts is that it should be fine, especially if you drive lots of miles).
However, I do off-road and you can't drive in 4WD on dry pavement. Definite no-no - can cause problems because your front and rear tires are locked together and if you go around a curve, they won't travel the same path.
If you have a 4x4 and want to take it out each month, find a nice dirt forest service road somewhere and enjoy some time alone. I've heard that it is best to use 4WD each month, though I don't know if it matters how far.
#170 of 547 Sienna vs Tacoma
Sep 03, 2003 (12:49 pm)
I'll agree that the Sienna gets its HP peak at a bit higher RPM than the Tacoma, but it beats the Tacoma's torque peak.
Sienna 3.3L V6
230 hp at 5600 rpm, 242 ft-lb at 3600 rpm
Tacoma 3.4L V6
190 hp at 4800 rpm, 220 ft-lb at 3600 rpm
I would imagine there are two good reasons. One, a dyno would probably show that the Tacoma generates more torque at lower RPMs (3600 is just where it peaks). Two, the Tacoma needs an engine update. Although, engine intake/exhaust systems may have different requirements due to the operating environments that may affect performance.