Acceleration hesitation/lag when warmed up only
06-20-18, 09:48 PM
#1
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Acceleration hesitation/lag when warmed up only
Sc 400 99k Mi. When car is cold it's perfect but once it gets warmed up after bout a mile or so it starts to lag when applied gas. It will bog down for millisecond and act like something is putting pressure against gaining acceleration. Only at low roms tho but still with hesitation and not giving its full 100%. Does it at any speed too. And only when warmed up. Have replace spark plugs fuel filter and had toyota dealership do efi/injection system cleaning. I have ran car without gas cap too still no change.
Please help Noone can see to find issue.
Email - ivipalldayx@live.com
Please help Noone can see to find issue.
Email - ivipalldayx@live.com
07-04-18, 01:44 PM
#2
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I have this same issue. I have tried replacing everything. Except for the egr valve, which I am planning on replacing soon. I also have new o2 sensors and cat converters ready to be put on. Hoping to solve this issue. Also I’m gonna flush my transmission and change the filter and shift solenoids.
07-04-18, 05:46 PM
#3
Step number one in eliminating SC400 hesitation or stumbling is to jumper the fuel pump relay to stop it from going into the low speed setting. There are several threads that detail how to do it and it will cost you nothing. If it still acts odd after that there are some other options but the relay is where to start.
07-10-18, 04:16 PM
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I'm taking to mechanic this next week. He said it may be coolant temperature sensor or idle air control or mass air flow. Will run diagnostics next week and let you all know of results.
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