A/T Shift problem?
Thread Starter
Lead Lap
Joined: Oct 2005
Posts: 734
Likes: 1
From: WA
A/T Shift problem?
I have an 06 IS350 and have recently noticed an issue with the transmssion. I can best describe it as an RPM increase when an upshift is expected. Basically the RPMs go up, but no shift.
Noticed just at low speeds, when the engine is cold. Also seems to have started after the camshaft grinding issue was fixed by the issue. This is when in 'auto' mode (not manual shift)
Anybody else with this issue? I wonder if the tech f'd up a connection when putting the engine back together after the cam gear fix?
Cheers
Noticed just at low speeds, when the engine is cold. Also seems to have started after the camshaft grinding issue was fixed by the issue. This is when in 'auto' mode (not manual shift)
Anybody else with this issue? I wonder if the tech f'd up a connection when putting the engine back together after the cam gear fix?
Cheers
Driver
Joined: Nov 2008
Posts: 101
Likes: 0
From: Ohio
My car acts a bit funky when the engine is cold on a cold day. Usually in 5th gear when it is holding off shifting to 6th until the engine is warmer. Once the engine is warmed up it acts fine. I just chalk it up to the cold weather and cold engine messing with the safety settings in the computer.
My car acts a bit funky when the engine is cold on a cold day. Usually in 5th gear when it is holding off shifting to 6th until the engine is warmer. Once the engine is warmed up it acts fine. I just chalk it up to the cold weather and cold engine messing with the safety settings in the computer.
I've been having a problem with my car where it stays in 3rd gear and wont shift it happens both in and out of power mode and lasts for upwards of 20+ seconds i dont know what the hell is it lexus is trying to tell me its cause my rims are different in the front than the back but ive been running my car like that for months
Pit Crew
Joined: Jan 2004
Posts: 111
Likes: 1
From: Florida
I feel like a mechanical hypochondriac but after the camshaft issue if I reverse the car step on the brakes and shift to drive and press the gas pedal there is a lag and a slight kick into drive like the transmission is slipping another time I sped up the rpm's seem to go faster but not the speed. I hope it just me. I got another year of warranty so I am only slightly worried.
Pole Position
Joined: Oct 2007
Posts: 374
Likes: 0
From: KY
I feel like a mechanical hypochondriac but after the camshaft issue if I reverse the car step on the brakes and shift to drive and press the gas pedal there is a lag and a slight kick into drive like the transmission is slipping another time I sped up the rpm's seem to go faster but not the speed. I hope it just me. I got another year of warranty so I am only slightly worried.
Just kidding.
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I think it depends on how aggressive you are driving. For example if I am trying to overtake someone on the freeway. The RPMs will hold and shift near red line. It is also normal for the IS to not to go past Gear 5 when the engine is cold. The IS is sluggish when the engine is cold.
Pole Position
Joined: Sep 2006
Posts: 2,883
Likes: 1
From: Coral Springs, Fl
I think it depends on how aggressive you are driving. For example if I am trying to overtake someone on the freeway. The RPMs will hold and shift near red line. It is also normal for the IS to not to go past Gear 5 when the engine is cold. The IS is sluggish when the engine is cold.
As cold as the engine can get overnight without freezing temps. You need to test what you are saying. Engines run better and more efficiently when they are warm, granted that they aren't too hot. Run a quarter mile on a cold engine and then run a quarter mile when the engine is warmed up.
Uh, sorry but what the heck are you talking about? Heat kills power, why do you think people put fans infront of dynos? to keep the engine cool and get a better reading from a cooler motor. i know from 1st hand experience, my rsx motor made 228.9whp after many dyno runs (while being tuned) and when we cooled down the motor, it jumped from 228.9 to over 233.x..cooler motor = better/higher power. same w/ a cold air intake, more cold air into the motor, better it responds. thats why its important to keep the motor as cool as you can during normal and track driving...it just responds better and makes better numbers
Uh, sorry but what the heck are you talking about? Heat kills power, why do you think people put fans infront of dynos? to keep the engine cool and get a better reading from a cooler motor. i know from 1st hand experience, my rsx motor made 228.9whp after many dyno runs (while being tuned) and when we cooled down the motor, it jumped from 228.9 to over 233.x..cooler motor = better/higher power. same w/ a cold air intake, more cold air into the motor, better it responds. thats why its important to keep the motor as cool as you can during normal and track driving...it just responds better and makes better numbers
You're a bit confused on this issue...
cold -air- is great. Not because it's cold per se though- because it contains more oxygen per volume compared to hot air.
cold -engine- is bad. Your combustion chamber should be hot. As hot as possible without detonation.
Here's a nice thread on why a cold running engine is a bad idea-
https://www.clublexus.com/forums/per...iator-cap.html
People put fans in front of dynos because
1) They think it provides higher flowing, cooler, AIR for the intake.
2) The stock vehicle cooling system isn't designed for you to run at WOT all the time- so they're trying to help it out since you'll be doing your dyno pulls at WOT.
Pole Position
Joined: Feb 2009
Posts: 226
Likes: 1
From: CA
I have an 06 IS350 and have recently noticed an issue with the transmssion. I can best describe it as an RPM increase when an upshift is expected. Basically the RPMs go up, but no shift.
Noticed just at low speeds, when the engine is cold. Also seems to have started after the camshaft grinding issue was fixed by the issue. This is when in 'auto' mode (not manual shift)
Anybody else with this issue? I wonder if the tech f'd up a connection when putting the engine back together after the cam gear fix?
Cheers
Noticed just at low speeds, when the engine is cold. Also seems to have started after the camshaft grinding issue was fixed by the issue. This is when in 'auto' mode (not manual shift)
Anybody else with this issue? I wonder if the tech f'd up a connection when putting the engine back together after the cam gear fix?
Cheers