Question about Chevrolet Chevy
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Posted on Jan 02, 2017
SOURCE: vacuum hose busted
Sounds like the computer system readjusted it self to the specific air measurements that the busted hose was allowing in to the engine.(This is only relevant if you have a 1987-up) turn off the car, remove the battery cables, and let sit for 45 min, this is ample time to reset the computer memory. Reattatch cables and start. It may run rough for a few miles but if after say 50 miles of driving, if it still wont idle, than you may need to replace sensors. (MAF, intake sensors, O2 sensors, etc..)
Posted on Aug 03, 2008
P0420 is catalyst system efficiency below threshold (bank 1)
P0440 is evaporative emission control system malfunction
P0441 is evaporative emission control system incorrect purge flow
Posted on Mar 29, 2009
SOURCE: clogged pvc valve
IT IS CAUSED BY ENGINE BLOWBY(COMPRESSION GETTING PAST THE PISTION RINGS)KEEP CHANGING THE PCV VALVES IT IS MUCH ,MUCH CHEAPER THAN REBUILDING THE ENGINE
Posted on May 13, 2009
Code P1491 is not the PVC Valve.It is the Vacuum Cut Valve Bypass Valve.
Which is located above and away from the egr canister under the driver side rear bumper it is round and have about 3 hoses connected to it. if it is from a check engine light that says look at vacume cut valve check the egr canisters purge valve some times they stick and throw the wrong code
Posted on Sep 01, 2009
also check the cat by removing the o2 sensor befor the cat and look in the hole. if there is any deformity to the cat ( melted, holes, missing) replace it right away the nature of the 2.5l it sucks the cat matirial back into the motor damaging the rings and bearings. the most comon cause of cat failure on that modle is head gasket failure so before sinking 750$ in a cat have the head gasket checked.
Posted on Mar 29, 2010
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