Question about 2004 Honda Civic
The engine checklight came on and I went to 3 different computer diagnostic centres and the scan showed VTEC system failure. I changed the VTEC solenoid, change vtec pressure switch, change engine oil. I used 10/30 honda synthetic blend all the time. The engine checklight still comes on. the engine oil level is ok. Whats wrong?
What is wrong is that you changed a part
You failed to follow any trouble charts because
you have none
The sensor was most likely okey & just doing it's
job of reporting a fault
You could have a mechanical problem such as a timing
belt issue or worn VVT Actuators on the end of the cames
You have to diagnose code related issues & then find out
why a sensor reported as it did
Even if you scoped the sensor you would most likely
assume it was bad,not so,have to keep thinking why the
data was bad
You need professional tools & look at several pieces of data
overlayed on a big sceen at one time
Repair shop or dealer for that issue
Posted on Nov 27, 2012
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Posted on Jan 02, 2017
If the engine calls for a 5w 30 weight motor oil,then stick with it,and use a blend,or full synthetic oil,castrol is the best,and use this fuel treatment,if you want to see a difference in fuel usage ,LUCAS fuel treatment,use it with as less as possible,fuel.It will work better,to clean the fuel system,and the injectors.Make sure the battery is real good,and check the alternator at the battery with engine running,it should read,13.65 volts,to 14.25 volts,with everything on,anything less,is not enough,replace the alternator.If the charging system,battery included,is not up to par,then the alternator works hard all the time trying to charge the battery up to full ,and it never does,because of ,either the battery is not in good shape,or the alternator is charging too little,and when the alternator engages,it pulls down on the engine,therefore using fuel more.
Posted on Jan 19, 2010
Testimonial: "Thanks for the great input! I'll check it out this weekend!"
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