rpms drop while braking
#11
throttle postioning sensor causes the pulsating problem,if the plugs arent the problem, the best way to tell an ecotec needs plugs is a rough cold engine start and it shakes a bunch and when doing the plugs DONT FORGET THE DIELECTRIC GREASE! there is no cap and rotor and all the plug boots (no wires) attatch to the coil packs on top of the plugs, and plus gm doesnt offer a 36k mile powertrain warranty, thats the bumper-to-bumper you are thinking about, your warranty on the powertrain should be good to 100k miles as long as you kept up on your maintenence properly
#13
After changing the plugs,fuel filter and cleaning out the throttle body it still drops rpms while braking but the tune up did help the idle a bit. So I took it to the dealer and after 3 hours the tech comes out and says youve got a burnt valve on cylinder 4. Luckily its covered under the powertrain warranty. Now my concern is, do valves just burn sometimes or is there an issue somewhere else that causes them to burn? Dont wanna keep going back with burnt valves if theres another issue causing them to burn in first place. And would a burnt valve cause the rpms to drop while braking? Thanks
#14
After changing the plugs,fuel filter and cleaning out the throttle body it still drops rpms while braking but the tune up did help the idle a bit. So I took it to the dealer and after 3 hours the tech comes out and says youve got a burnt valve on cylinder 4. Luckily its covered under the powertrain warranty. Now my concern is, do valves just burn sometimes or is there an issue somewhere else that causes them to burn? Dont wanna keep going back with burnt valves if theres another issue causing them to burn in first place. And would a burnt valve cause the rpms to drop while braking? Thanks
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