Car Questions
RepairPal is your advocate for car care advice and guidance

How can i tell if it's the valves or the plug wires that are bad.

(1998 Toyota 4Runner)
in Jacksonville, FL on January 28, 2012
i took it back and the mechanic said i needed a valve job. 1,200.00. it accelerates fine but as soon as i let off the gas it starts sputtering/skipping. the wire he put on looked aftermarket. at first he said the wires that he installed were faulty and replaced them. how can i tell if i need a valve job? what are the symptoms of bad valves?
Displaying 1 answers & 0 comments
Popular Answer
First check the valve clearances, the valves on that engine are shim adjusted and are often over looked at a "tune up"! If valve clearance is OK then check compression to make sure it is uniform and strong, perhaps do a cylinder leakage test. Distributor cap,plugs, plug wires and rotor do go bad over time. Inspect the plugs when you are doing a compression test.
With the engine running spray water from a spray bottle like Windoline/Windex on the distributor cap and plug wires if the insulation is good the idle speed should not change, if the insulation of the plug wires is bad you may hear sparking snapping sounds and hear the engine idle change .
RepairPal estimates are guaranteed at over 2,000 quality certified locations nationwide. Learn more

Similar Questions

View answers to similar questions from RepairPal's community of auto experts and enthusiasts.
The truck runs fine had to replace that BCM about 3 months ago because my lights and my windows wouldn't work. After ...
I was looking at a 2012 Durango crew with 170k miles on it he wants under $10k for truck my concern is how many more ...
Didn't find what you were looking for?