1991 Toyota 4Runner Q&A
1991 Toyota 4Runner Question: SMELLS LIKE IM RUNNING TO RICH.
MY 91 4RUNNER JUST GOT REBUILT BUT EVEN BEFORE THAT IT HAD THE SAME PROBLEM. WHEN ITS ON IT SMELLS TO RICH AND WASTES MORE GAS THEN BEFOR IT GOT REBUILT. ALSO WHEN IM ON THE FREEWAY I WILL HAVE IT ON A STEADY SPEED AND AT RANDOM IT WILL GO FROM 2000 RPM, DOWN SHIFT TWICE AND GO UP TO ALMOST 6000 RPM, THEN SHIFT BACK UP ONE DROP TO ABOUT 4900-5300 RPM AND STAY LIKE THAT FOR ABOUT TWO MINUTES THEN GO BACK TO NORMAL ALL ON ITS OWN. CAN ANYONE HELP I LOVE MY LITTLE 4X4 AND DONT WANT TO GET RIDE OF IT BUT WILL HAVE TO IF I CANT FIX IT DUE TO IT KILLING ME ON GAS.. - BLKone
POSS TIGHT VALVES? - globalhelper
The pinpoint test for your 1271 code will have to be performed,but what I have seen on vane airflow meters is that the door mechanism can come undone from the little clockspring inside of the unit and give similar symptoms because the engine does not know what the load is. if you type in " Toyota vane air flow meter" on you tube there is a video of a guy testing one. These can be repaired,and you'll be able to tell if it's a mechanical failure because the door will not spring back. - bmdouble