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check engine light flashing while driving in 3rd.

any ideas on what the problem would be. good news please :)

check engine light flashing while driving in 3rd.

Postby chevy_always [OP] » Aug 10 2013, 10:55pm

I know this has been a real common topic lately [u]hard shift from 1st to 2nd[u] my truck has been doing this for quite a while. earlier I took it to a dealer mechanic and I was told it was the shift relay or im not sure what its called but they reset it for $400. it somewhat fixed it but then it stared up again a half a year later. its become a nuisance. BUT that isn't my question. ive looked at many posts on here and it seems like there really is no answer other than its normal for chevy transmissions.
my problem now is that three times no while driving in 3rd over 55 mph my check engine light starts flashing. nothing else happens but as soon as I put it in D it stops. ive took it to a transmission shop and get nowhere because apparently they cant tell anything if the light isn't on. I have made myself believe that it may have something to do with the hard upshift. but im not a mechanic and I just don't know. "real" mechanics just tell me to replace it ($2500)!!!!!!!!!
Can anybody give me any good news or any suggestions?
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Re: check engine light flashing while driving in 3rd.

Postby ASTE25 » Aug 11 2013, 5:31am

A flashing check engine light is normally an indication of a major misfire condition. Someone who checks the computer with a diagnostic scanner (not just a code reader) can see if there is a history of missfires and what cylinder it is happening on.
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Re: check engine light flashing while driving in 3rd.

Postby chevy_always [OP] » Aug 11 2013, 5:59am

ive been told that aste25, I replaced the plugs and wires after the second time it happened. like I said Im not a mechanic so I don't know where else I could look at if there was some misfiring. should I just take it in to a mechanic I don't trust too much?
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Re: check engine light flashing while driving in 3rd.

Postby ASTE25 » Aug 11 2013, 6:06am

The intake gaskets are known to leak. A leaking intake gasket can cause a misfire due to it causing a lean condition.
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Re: check engine light flashing while driving in 3rd.

Postby chevy_always [OP] » Aug 11 2013, 6:12am

im gonna check it out . maybe see about replacing them just to see if it helps and if that's the problem. I wouldn't know how to be sure. thanks aste25
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Re: check engine light flashing while driving in 3rd.

Postby ASTE25 » Aug 11 2013, 6:14am

you can try spraying brake cleaner around the intake gasket while the engine is running. If it is leaking the idle speed should change.
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Re: check engine light flashing while driving in 3rd.

Postby chevy_always [OP] » Aug 11 2013, 6:38am

had to watcha video on youtube to see what the work would bring me to mess with the intake. basically that's how I learn to work on my Silverado.
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Re: check engine light flashing while driving in 3rd.

Postby ASTE25 » Aug 11 2013, 7:19am

I used to do it for a living and I learn stuff like that to this day.
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Re: check engine light flashing while driving in 3rd.

Postby SilverSurfer » Aug 11 2013, 7:24am

There is a TSB out on the harsh 1-2 shift. It calls for installing the 1-2 accumulator valve conversion kit. I just did this on mine and it shifts great now. That TSB came out in 2011.

You said the ck eng light flashes. Could it be some other light? Trans warning light telling you to upshift? Why didn't the mechanic plug in a scanner and test drive it to duplicate the condition? I'd say you haven't found a "real" mechanic, yet.
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Re: check engine light flashing while driving in 3rd.

Postby chevy_always [OP] » Aug 12 2013, 12:18am

the check engine light only comes on when im on 3rd and im pretty sure its that light, there is no other light for check engine other than on the digital window. I guess it makes sense if its telling me to upshift but I understood its ok to use 3rd as drive. and as for finding a real mechanic, I can agree with that. no one has tried duplicating it.

also for the 1-2 accumulator valve conversion kit. where can I get it and can I install it?
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