I have a 2009 Corolla, runs fine overall no problems but- when I am braking and the car is coming to a stop I can feel a shake in the engine for maybe 3 seconds then it recovers. If I brake at other times it is ok, only at the last few feet of stopping. Any ideas appreciated. No CEL
issue with engine rpm when stopping
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Welcome to TN :hi:
Does it shudder in gear at a stop? Or when the ac is engaged? I wonder if it is just a dirty throttle body. Or something more serious like a transmission holding a taller gear too long. When is the last time you had the transmission serviced?
Does it shudder in gear at a stop? Or when the ac is engaged? I wonder if it is just a dirty throttle body. Or something more serious like a transmission holding a taller gear too long. When is the last time you had the transmission serviced?
The idle is fine at all other times only that 3 seconds when I am coming to a stop. The car only has 25000 miles on it. I do not have any trans issues. At idle w or w/o the AC it idles fine in gear. I have done 2 seafoam sprays into the intake which did not help. I was thinking something in the pollution control or vacuum system ?? Was owned by an older woman who rarely drove so I am in the process of replacing everything I can examine. The tabs on the intake manifold gasket are red so I am thinking thats still in good shape.
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It should be covered in the maintenance sticky here---- http://www.toyotanation.com/forum/1...official-gen-5-6-diy-vehicle-info-sticky.html
"I was thinking something in the pollution control or vacuum system"
The evap purge valve opens at times to burn gas vapor collected in evap canister.
If charcoal canister is compromised and contains liquid fuel it could cause engine to over fuel when purge valve opened.
This would be noticeable at idle causing engine shudder.
A scan of the engine purge valve operation during the engine shudder would prove/disprove this.
In addition disabling the purge valve operation( keeping it closed) would be another approach.
Shudder at the last few feet of braking, if you hear pumping sound/hard pedal, can be related to ABS activation.
The evap purge valve opens at times to burn gas vapor collected in evap canister.
If charcoal canister is compromised and contains liquid fuel it could cause engine to over fuel when purge valve opened.
This would be noticeable at idle causing engine shudder.
A scan of the engine purge valve operation during the engine shudder would prove/disprove this.
In addition disabling the purge valve operation( keeping it closed) would be another approach.
Shudder at the last few feet of braking, if you hear pumping sound/hard pedal, can be related to ABS activation.
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