Problems after replacing master cylinder
in [Technical]
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From: Bill on 7 Apr 2010 10:43 "Mark" wrote in message > ...I have also been getting > the check engine light with code P0446 (Evaporative Emission Control > System Vent Control Circuit Malfunction). > One cause of evaporative system problems is constantly "topping off" the gas tank when filling up. The charcoal canister which is used to filter fumes from the gas tank can fill with gasoline if the tank is frequently "filled to the brim". If an attendant is filling your tank and you are paying with a credit card, when the nozzle clicks, say "That is fine!" (They will want to fill it to an even dollar amount for some reason? But not necessary since they are not giving you change!) If paying cash, just go up to the next quarter, then you will get quarters in change.
From: address_is on 11 Apr 2010 02:04 "Bill" <billnomailnospamx(a)yahoo.com> wrote: > "Mark" wrote in message > > ...I have also been getting > > the check engine light with code P0446 (Evaporative Emission Control > > System Vent Control Circuit Malfunction). > > > > One cause of evaporative system problems is constantly "topping off" > the gas > tank when filling up. The charcoal canister which is used to filter > fumes > from the gas tank can fill with gasoline if the tank is frequently > "filled > to the brim". > > If an attendant is filling your tank and you are paying with a credit > card, > when the nozzle clicks, say "That is fine!" (They will want to fill it > to an > even dollar amount for some reason? But not necessary since they are > not > giving you change!) If paying cash, just go up to the next quarter, > then you > will get quarters in change. What's probably happened is that the rod which is connected to the booster was not adjusted to the new master causing the brakes to stay slightly applied. We live in hilly area here in BC Canada and run into a problem called warped rotors. As the rotor gets overheated from over braking, the two parallel surfaces of the brake rotor becomes warped. These unparalleled surfaces cause the pads to move unevenly producing the shake in the steering wheel and pulsation in brake pedal. The heated rotors and pads cause a condition as brake fade. This codition requires more pedal effort as brakes get hotter. The shaking is reduced ss the rotors cool . The rod that pushes on the masters' piston is adjustable for length to set free play. Too much length and the master will keep pressure to the braking system. Setting proper lenghth will solve this problem. The only other problem is to fix the warp rotors you need to machine or replace the rotors back to two parallel surfaces.
From: Paul Hovnanian P.E. on 13 Apr 2010 00:10 Air leak (intermittent) between the booster and intake manifold. You lose vaccum and the brakes need a lot more pedal pressure. When the leak occurs, the engine runs rough and shakes. -- Paul Hovnanian mailto:Paul(a)Hovnanian.com ------------------------------------------------------------------ Very funny, Scotty. Now beam down my pants!
From: Tegger on 13 Apr 2010 08:03 "Paul Hovnanian P.E." <Paul(a)Hovnanian.com> wrote in news:4BC3EEAA.15B3869B(a)Hovnanian.com: > Air leak (intermittent) between the booster and intake manifold. You > lose vaccum and the brakes need a lot more pedal pressure. When the leak > occurs, the engine runs rough and shakes. > If it were an air leak, the idle would be elevated. Rough-idle and shaking were characteristics of non-feedback systems that were unaware of loss of manifold vacuum. OP's Lexus has a feedback system. -- Tegger
From: Paul Hovnanian P.E. on 13 Apr 2010 23:27
Tegger wrote: > > "Paul Hovnanian P.E." <Paul(a)Hovnanian.com> wrote in > news:4BC3EEAA.15B3869B(a)Hovnanian.com: > > > Air leak (intermittent) between the booster and intake manifold. You > > lose vaccum and the brakes need a lot more pedal pressure. When the leak > > occurs, the engine runs rough and shakes. > > > > If it were an air leak, the idle would be elevated. Not if the ECU compensates for the leak. > Rough-idle and shaking were characteristics of non-feedback systems that > were unaware of loss of manifold vacuum. OP's Lexus has a feedback system. But a feedback system would compensate for the average error. If the vacuum for the brake system is tapped off a part of te manifold nearer one cylinder, it will throw that one's mixture off. -- Paul Hovnanian mailto:Paul(a)Hovnanian.com ------------------------------------------------------------------ "Arguing with anonymous strangers on the Internet is a sucker's game because they almost always turn out to be, or to be indistinguishable from self-righteous sixteen-year-olds possessing infinite amounts of free time." - Neil Stephenson, _Cryptonomicon_ |