Question about 1991 Toyota 4Runner
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.
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
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