Tranny ECU

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Apr 1, 2006 | 02:05 AM

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From: Findlay, Ohio

Tranny ECU

well my friend drove the Z yesterday and said its not slipping....the cpu is not tellin the tranny to shift fast enough of at all sometimes and my chevy dealer wants a $150 just to start with the basic look over

so how do u guys think i can fix it or get around this problem?

btw the tranny won't shift into 2nd at normal speeds until like 3-4k and it bangs the rev limiter from a dig or any roll going into WOT....other then that 2-3 and 3-4 shifts are perfect.

please help if u can....thanx

Apr 1, 2006 | 02:29 AM

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From: Findlay, Ohio

hey do u guys think tthe TSP tune that i'm about to get will help out with the shifting pattern?....i'm also adding a 3200k stall in about a month or two

Apr 1, 2006 | 08:04 AM

Automatics

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Try Ed Wright at fastchip. He is one of the top guys when it comes to understanding & solving these problems, very knowledgeable & friendly.

Last edited by Ragtop 99; Apr 1, 2006 at 10:35 AM. Reason: non sponsor link

Apr 1, 2006 | 10:42 AM

Ragtop 99

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From: Bethesda, MD

Is this only at WOT? A Lid and headers when properly installed should not impact the ECU's shifting pattern at part throttle. You also do not have a stall. What did your friend base his conclusion on? Does he have scanning software? If your car is not shifting right at part throttle it is probably a mechanical issue.

Apr 1, 2006 | 02:46 PM

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From: Findlay, Ohio

its WOT and part throttle but only second shift......all the other gears are fine

Apr 2, 2006 | 04:18 AM

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From: Findlay, Ohio

come on guys.....a lil help please

Apr 2, 2006 | 08:55 AM

FLT

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From: Wood Dale, Illinois

If 4th gear is ok I would have to say that you have a tuning problem. This imo, to complete a 1-2 one of your two shift solenoids must release to apply the band. Then in 3rd the other solenoid turns off bringing on the 3-4 clutch. To complete the 3-4 shift the first solenoid that turned off must come back on. If the computer is telling the trans to do so and it's not happening it's a solenoid or band. If the computer is not commanding the trans to shift it's got to be a tuning issue. Have you changed the stall in this car. I have heard that with stalls if there on the high side tuning is a must. This might be your problem. Basically what I'm saying is you need to determine if its trans or computer. With a stall you might have to adjust your 1-2 shift timing.