04 aveo runs good but no 4th gear - 2004 Chevrolet Aveo

very easy just go to reliable-store,com it has all manuals
there many other websites also but in this matter this website is too good

sounds like your clutch needs replacement

2005 Chevy Aveo - engine light and hold lights flash - Fixya

www.fixya.com/.../t1361856-2005_chevy_aveo_engine_light_hold_ligh...

Dec 11, 2008 - 2005 Chevy Aveo - engine light and hold lights flash Yesterday I had my ... When I started the car to come home they started flashing again.

Chevrolet Aveo Transmission Problems - Car Forums at Edmunds.com

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Sep 23, 2010 - 30 posts - ‎19 authors
Next time it jumps out of gear to push the onstar button and have it towed to .... to either start in 3rd gear (absolutely no power from a cold start until .... The car has beenstuck in park in both situations, level ground and ... My automatic 2005 Chevy Aveo LS requires T-IV Automatic Transmission Fluid (GM pt.

Sometime s its kind of hard to tell for sure with and automatic if it has shifted into high gear .You say new engine installed check the linkages and all shift related parts if it shifted before and nothing was changed it should shift now
Also take a look at the interlock switch on the side of the transmission it is derectly linked to to the shift lever on the coloum

Out of the blue my aveo flashes Hold and won't go into fourth. Disconnected the battery to clear the code and it shifts fine until the car goes through a cycle. I'm sure it's a some low qual Korean sensor/solenoid. Overall, this is has been a great econobox reminiscent of my 1989 Honda Civic. I've replaced most of the sensors with NON -Korean replacements and really haven't had many issues. So when I find the offending solenoid/sensor I will post it here.

This transmission is electronically shifted via solenoids controlled by a computer, so you need to have that tested for fault codes that may be in memory.

4th gear synchro may be stuck on its mating surface.

There is a hold button on the shifter or the console. When activated the transmission is locked into the selected gear and the hold light will come on.

An example is putting the transmission in 4th gear, pushing the hold button, and taking off in the snow. Wheel slip would be limited.

You will need the check engine light code read with a scanner and diagnosed.

If the timing belt became chewed up it would seem the belt/timing has slipped (do not try starting it like this bad things could happen) You'll need to replace the timing belt, tensioner and insure the proper mechanical timing is done for it to run properly if at all. If the belt failed at highway speed and it has a interference fit engine this would mean a valve or two may be bent too. I'd check the timing and once this is corrected I'd checking cylinder compression.
I hope this may have helped,
Tom

Sometimes particular clutch packs can fail and the computer won't set a code. The only time a code can be set is if a sensor actually "sees" a problem. Possibly in this case, the clutch pack can fail but the proper line pressures are still right because the front pump is supplying proper pressure and the servos are applying the clutches. Probably the cheapest way to determine your problem would be to drop the transmission pan and carefully catch the fluid in a container. Then, check the fluid and the inside of the transmission pan for clutch debris. This sounds like an amateur way to do it but if it were in my shop, that would be my first step in diagnosing the problem. Good luck!