SureTrack Community Fix: Unbalanced 4Runner
Real Fixes from Mitchell 1’s SureTrack® expert information resource are documented issues from actual shop repair orders and community discussions. Read on to see how SureTrack can help you correct issues that are not easily diagnosed using OEM information alone. SureTrack is available at no additional cost in our ProDemand product.
Here’s another vehicle with intermittent symptoms that tricky to diagnose. Tested all the usual causes and still not fixed. SureTrack community member boysshop had a Toyota 4Runner in the shop that had intermittent idle and stalling issues. They posed the question to the community, and with the help of fellow community members ericsautomotive, DAG1365 and others, they were able to resolve the issue quickly.
The following Community Fix summarizes the interaction between members of the community that led to the solution.
2002 Toyota 4Runner SR5 3.4L
Erratic idle, stalling, replaced harmonic balancer.
Customer complains that truck has rough idle and stalls at times.
Diagnostic Steps Performed/Parts Replaced
Vehicle has an erratic idle, RPMs fluctuate up and down. Starts fine. Found code P0300 random misfire and P0301 through P0306. While driving down road, vehicle seems fine and seems to have the power it should. At intersections or stops, the vehicle will die out. Changed spark plugs and PCV. No vacuum leaks found. Fuel pressure at 42 psi. Cleaned throttle body. MAF and Coolant sensors indicate fine and within specs.
Found harmonic balancer spinning freely. Woodruff key had broken off and pulley spinning on crankshaft. Thank you for your help!
Replaced harmonic balancer, road tested vehicle and no longer has rough idle or stalling.
SureTrack® adds to the power of ProDemand® with an exclusive combination of real-world knowledge and powerful diagnostic tools, all wrapped in an interactive community of professional technicians. Designed to help automotive shops increase accuracy and efficiency from diagnosis to completed repair, the industry’s most comprehensive repair information resource is just a few clicks away.
Want more? Here’s how you can see more Real Fixes in SureTrack: