Question about 1991 Toyota 4Runner

2 Answers

High R.P.M.s at 60 mph.

My son has a 91 4 runner with a 3.0 litre in itt when he is on the highway cruising around 60 to 65 mph. his R.P.M.s jump from 2200 to 4000 after about 2minutes driving. this is while on flat ground. I plugged in my scanner to it and the only code we got was for the T.P.S. we put in a new one and the error code is gone but it still has the R.P.M. issue. he is also only getting around 12 miles to the gallon. any suggestions would be greatly appreciated.

Posted by on

  • Fred Kenmuir Oct 10, 2008

    thermostat is working and coolant level is right up. I tok it for a test drive and after about 5min. it was like it just down shifted on it's own and the R.P.M.s jumped up. I guess in the previous message I forgot to add that it is an automatic. another thing I found this morning is that when I put the vacuum guage on it the vacuum was low so Iadvanced the timing to get the proper vacuum. curb idle r.p.m. is suppose to be 800 r.p.m. and to get proper vacuum I had toadvance it to 1200 r.p.m.

×

2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Toyota Master
  • 1,861 Answers

Thank you for allowing me to assist you!
I will bet that when your RPM issue happens, the temp gauge is reading low. The temp gauge should be at 1/2 at all times. What I believe is happening here is that the thermostat is sticking open, and, when the coolant drops below 172 degrees F, the OD solenoid is disengaged. This will def shoot up the RPMs. Drive the vehicle again, and note where the temp gauge is when the problem happens. If the gauge is indeed low, you will need to replace the thermostat. Additionally, a "low-coolant" condition can, at times, duplicate this condition, as the coolant temp sensor is not seeing the coolant rushing past it, and also could be the problem. Check both, and get back to me if you need additional info. I hope that this helps you eliminate you condition.

Posted on Oct 10, 2008

CHECK ALL VAC HOESES. COULD HAVE A LEAK IN ONE AND CAUSEING THE LOW VAC. AS TO THE HI RPMS, IT IS DOWNSHIFTING. CHECK THE TEMP SENDING SENSOR. IF IT GOES BAD THE COMPUTOR WONT READ TEMP AND THE TRANSMISSION WILL GO TO A FAIL SAFE MODE.( 3RD GEAR).AS FAR AS SCANNING IT YOU NEED TO BE DRIVEING IT AND SEE WANT IT IS DOING WHILE SCANNING. IF ONE SENSOR IS NOT GETTING VOLTAGE IT CAN CAUSE THE PROBLEM.

Posted on Oct 10, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Why is rpm is at 3000rpm but truck is only at 70mph not going into overdrive


70 mph at 3000 rpm - Ford Explorer and Ranger Forums "Serious ...

www.explorerforum.com > ... > General Explorations!!

May 13, 2003 - 19 posts - ‎14 authors
Elite Explorer members can change the forum "styles" to eliminate most ads, including the blue underlined links, and no ads on photos. Are my "rpms" too high?
19 posts
Feb 8, 2010
2003 Explorer Transmission solenoid and overdrive servo
16 posts
Nov 11, 2008
More results from www.explorerforum.com

Why is my car running at 3000 rpm? ' Yahoo Answers

https://answers.yahoo.com/question/index?qid...
Jan 28, 2010 - Most days when I am just cruising along at 65-70 mph my engine is at about ... However, some days it will be at 3000 rpm while only going 60-65 mph, ...into overdrive. it wont hurt your engine running that high, but you will get ... Why does my car run at 3000 RPMs going 70mph?
Dec 15, 2011
1998 Dodge Dakota 3rd to overdrive problem?
Jun 27, 2010
More results from answers.yahoo.com

Dec 03, 2015 | Cars & Trucks

1 Answer

2002 chevy s10 temperature gauge jumping around, feels like automatic transmission slipping at speeds above 60 mph


Do you have an OBDII scanner to check the real temperature? Want to make sure it's not overheating. If it's normal, could be your temperature sensor starting to go out, or ignition switch. Any check engine lights? If so, get the code for me, can go from there. At a constant speed, you sure it wasn't a misfire instead? Check your trans fluid, make sure it's full. I was just in Tahoe, pretty sad not much snow at all.

Feb 04, 2014 | Chevrolet S 10 Cars & Trucks

1 Answer

Drive cycle


Here is the OBD2 emission system drive cycle test procedure.
Engine coolant temp must be below 70c (158f) before starting the engine for either the first or second trip
The fuel level should be less than 1/2 full
First trip:
Start engine, idle for at least 1.5 minutes
Drive 3 minutes, hold b/f schdl: 1.5-2.0 msec, selector lever "3rd" eng rpm 1,800-2,000 A/C switch:ON Hold the recommended b/f schdl range. Allow road speed to vary as necessary.
Drive at 55-65 mph for 1.5 min b/f schdl 2.0-3.2 msec, selector lever "5th" Engine rpm 2,200-3,000
IGN "off" for at least 10 seconds (not more than 5 min)
Dive at 50-60 mph for 3 minutes Selector lever "4th" keep engine speed above 3,000 rpm Allow speed to vary if necessary. Do not decelerate for more than 3 consecutive seconds. A/C switch ON.
Drive at a steady state cruise of 53-58mhp b/f schdl more than 1.8 msec selector lever "5th" eng rpm 2,400-2,600
Downshift to "4th" and decel more than 5 seconds without breaking, then idle for 1 minute.
Drive two minutes b/f schdl less than 2.0 msec Accelerate to 41 mph, decelerate to 34 mph, accelerate to 41mph. Do not completely release the accelerator. A/C switch off.
Idle 1 minute in park or neutral
Drive two minutes Steady state cruise at 31-44 mph. Selector lever "4th" A/C switch OFF. Hold the accelerator pedal as steady as possible. Allow speed to change if necessary.
End of first trip. Turn the key off the begin the second trip.
Second trip:
Start engine, idle for at least 1.5 minutes
Drive 3 minutes, hold b/f schdl: 1.5-2.0 msec, selector lever "3rd" eng rpm 1,800-2,000 A/C switch:ON Hold the recommended b/f schdl range. Allow road speed to vary as necessary.
Drive at 55-65 mph for 1.5 min b/f schdl 2.0-3.2 msec, selector lever "5th" Engine rpm 2,200-3,000
IGN "off" add four gallons of fuel
Dive at 50-60 mph for 3 minutes Selector lever "4th" keep engine speed above 3,000 rpm Allow speed to vary if necessary. Do not decelerate for more than 3 consecutive seconds. A/C switch ON.
Drive at a steady state cruise of 53-58mhp b/f schdl more than 1.8 msec selector lever "5th" eng rpm 2,400-2,600
Downshift to "4th" and decel more than 5 seconds without breaking, then idle for 1 minute.
Drive two minutes b/f schdl less than 2.0 msec Accelerate to 41 mph, decelerate to 34 mph, accelerate to 41mph. Do not completely release the accelerator. A/C switch off.
Idle 1 minute in park or neutral
Drive two minutes Steady state cruise at 31-44 mph. Selector lever "4th" A/C switch OFF. Hold the accelerator pedal as steady as possible. Allow speed to change if necessary. I especially like the part where they want you to add four gallons of fuel. Not three gallons, not five gallons, four gallons. Gotta love those Nissan engineers. ...and of course they state that if the trace is not followed exactly (i.e. you botch the acceleration/deceleration) you have to start all over again from scratch

Feb 09, 2012 | 1996 Nissan Pickup

1 Answer

I have a 2002 Wranglet 4.0L. lately I've noticed the oil pressure gauge running near max. The users manual says normal pressure is between 45-65. My oil level is normal and I don't notice any leaks. The...


oil gets thicker as it gets older,so pressure increases,try puting in sae10/40 simi synthetic with a new filter...the pressure 45-65 is an average pressure lower road speed lower pressure/higher means higher.....

Sep 11, 2010 | 2002 Jeep Wrangler

1 Answer

97 4 runner 4wd seems to struggle or slip over 60 mph


Your electronic overdrive is worn... Go to a transmission specialist to have it serviced &/or repaired.

Jun 13, 2009 | 1997 Toyota 4Runner

3 Answers

91 nissan Sentra losses power at highway speeds


remove the front 02sensor and drive the car like that, remove means complety take it apart from exaust, if problem goes away or gets so much better then your catalitic converter at the exaust is restricted and need a new one

Jun 19, 2008 | 1991 Nissan Sentra 2 Door

Not finding what you are looking for?
1991 Toyota 4Runner Logo

264 people viewed this question

Ask a Question

Usually answered in minutes!

Top Toyota Experts

yadayada
yadayada

Level 3 Expert

60792 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Toyota Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...