car lurches when i let off the gas
10-28-10, 07:56 PM
#1
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car lurches when i let off the gas
if i use the gears to slow down, it's steady for a moment, then it lurches, like i keep tapping the gas. is this normal? I've never been in a car that does that so i have no idea what to even think about doing.
10-28-10, 08:15 PM
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no, it's constant, if my feet aren't on any pedals, it lurches pretty much constantly until i press the gas or the clutch in. this is before it gets to a low speed, this is de-accelerating speeds.
10-29-10, 06:48 AM
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What rpm does this happen at?
Does this happen if your say in 4th gear on the highway and let off the gas
and coast or is it when you down shift to let the engine help brake the car?
Below a certain rpm rotaries tend to buck and it can get exaggerated if your foot
is on the gas when it happens.
Does this happen if your say in 4th gear on the highway and let off the gas
and coast or is it when you down shift to let the engine help brake the car?
Below a certain rpm rotaries tend to buck and it can get exaggerated if your foot
is on the gas when it happens.
10-29-10, 10:03 AM
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it will do it if i coast, or if i use the engine to slow down. it seems to do it between 1500 and 2000 rpm's only. and only if my foot is not on the gas. i can put it in whatever gear and keep it at any rpm and it wont do it. so it's just the nature of the beast, eh?
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10-29-10, 01:59 PM
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It's not uncommon for rotaries, especially ported ones. What you're experiencing is dilution of the intake charge with exhaust gases causing misfires. It's the same effect that causes the distinctive "brap brap brap" idle of bridgeported and peripheral ported engines, just not as extreme.
10-29-10, 03:03 PM
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It is pretty common for decel when in too high a gear, especially in the 1500 rpm range. Also common for newbees to driving a round motor. It is telling you to use the brakes instead of the driveline to slow it down. Using the trans to slow a vehicle down (any vehicle) does more damage to the clutch, trans, rear engine bearing, driveshaft and rear which generally cost a lot more to repair than replacing brakes.
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