Question about Toyota Corolla
Check for vacuum hose off, broken,cracked, or loose at a connection.
Posted on Mar 14, 2011
If your car or truck doesn't run at the same idel speed all the time then you can cheack the battery first to see that it's fully charged and good. if it's bad any load can change the demand for altenator power and as it tries hard and les hard as needed it will load the engine more or less. The older Toyotas builr before 1993 have lots of vacume hoses and the newer ones a few and if any of them leak it''ll hunt the idel the PCV valve is well known to get dirty and make the idel change. The tuneup if it's old a missing or just highly gapped spark plugs can make if idel rough or come on and then slow down again. a dirtly air filter will do this for the same reason and so will dirty oil. Most cars if the oils not changed at least every 6 months of operation everything will start stopping up and it'll get alot more problems than just the idel being going up and down. These vacume hoses fal off and split and rot and get connected wrong. So check them one at a time by removeing them and putting them back on and if they break theirs bad even if they were OK before you broke them so have pleanty of hose before you start as the hose is cheaper than the repeated trips to the store.
Posted on Mar 14, 2011
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Posted on Jan 02, 2017
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