I wrote in a month or two back about a timing belt break. I replaced it myself but it had a rough idle(stalls about twice a week) after the repair. The belt did not actually separated but the knobs on the belt around the crank pulley came off, So the cams never really were free. Well 3,000 miles later no mileage difference than before, anything above 1k rpm and she's smooth. Anything else that I can check that might explain the rough idle that don't cost a mint? Oh! not even a engine light on.
Puzzled by my Da-woo (Aveo)
3k and still going!!!!!!
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john_trickle
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first things to check is.
Check for any codes.
. Ensure correct spark plugs (NGK only) are installed and that they are in good shape. I change platinum plugs every 50,000 miles.
. Change fuel filter, if it hasn't been changed in 60,000 miles.
. Check throttle cable--ensure it hasn't come loose from any brackets and is properly adjusted.
. Warm up engine and check idle rpm.
. Check EGR Valve
. Also check for any vacum leaks
Also try doing this below and see if the problem persits
Resetting the ECU is done to wipe off all the feedback the ECU got about the engine, after doing that the ECU will start learning about the engine all over again so it can "feel" the new mods or service you just done.
1- unhook the -ve connector of the battery or the ECU's fues (check your manual for the correct fuse).
2- step on the brakes so that the brakes light drains any stored power in the car's electrical system.
3- put back the - ve connector of the battery.
4- turn on the ignition key on for 5 seconds then back off for 3 consecutive times
5-start the engine.
6- follow the learning procedure at this link
http://www.daewootech.com/forum/viewtopic.php?t=2609
Check for any codes.
. Ensure correct spark plugs (NGK only) are installed and that they are in good shape. I change platinum plugs every 50,000 miles.
. Change fuel filter, if it hasn't been changed in 60,000 miles.
. Check throttle cable--ensure it hasn't come loose from any brackets and is properly adjusted.
. Warm up engine and check idle rpm.
. Check EGR Valve
. Also check for any vacum leaks
Also try doing this below and see if the problem persits
Resetting the ECU is done to wipe off all the feedback the ECU got about the engine, after doing that the ECU will start learning about the engine all over again so it can "feel" the new mods or service you just done.
1- unhook the -ve connector of the battery or the ECU's fues (check your manual for the correct fuse).
2- step on the brakes so that the brakes light drains any stored power in the car's electrical system.
3- put back the - ve connector of the battery.
4- turn on the ignition key on for 5 seconds then back off for 3 consecutive times
5-start the engine.
6- follow the learning procedure at this link
http://www.daewootech.com/forum/viewtopic.php?t=2609
Great advice John !
I'm gonna bookmark your answer.
Something I have been thinking about though.
Regarding his original issue ? The timing belt with teeth worn off ?
Visualize this in your mind.
The crankshaft is spinning. The pistons are going up and down.
The timing belt is tight.
BUT !
No teeth on belt at crankshaft.
So, the camshafts are not moving.
BUT !
Some valves are open and some are closed. And without cam-action they stay that way.
It would seem that after two revolutions of the crankshaft, some of the valves would be hit by the piston tops.
That would be the ones 'open' or "held-down' by the camshafts.
But, who knows?
Maybe if its an automatic transmission and the T belt-teeth stripped while it was being driven. Or even at idle ?
Than, maybe the crankshaft would have stopped dead and not turned at all. Thats possible, I guess. But the teeth were worn/broken off at the crankshaft which seems to indecate that the crankshaft was turning and the belt was not.
If it is a stick tranny and was being driven, than the drive-wheels would have turned the crankshaft.
I would also guess an inital attempt at re-starting would have been tried. For sure that will turn the crankshaft.
This is how I see it.
Anyone have any thoughts on this ?
Am I wrong ?
Am I correct ?
I'm gonna bookmark your answer.
Something I have been thinking about though.
Regarding his original issue ? The timing belt with teeth worn off ?
Visualize this in your mind.
The crankshaft is spinning. The pistons are going up and down.
The timing belt is tight.
BUT !
No teeth on belt at crankshaft.
So, the camshafts are not moving.
BUT !
Some valves are open and some are closed. And without cam-action they stay that way.
It would seem that after two revolutions of the crankshaft, some of the valves would be hit by the piston tops.
That would be the ones 'open' or "held-down' by the camshafts.
But, who knows?
Maybe if its an automatic transmission and the T belt-teeth stripped while it was being driven. Or even at idle ?
Than, maybe the crankshaft would have stopped dead and not turned at all. Thats possible, I guess. But the teeth were worn/broken off at the crankshaft which seems to indecate that the crankshaft was turning and the belt was not.
If it is a stick tranny and was being driven, than the drive-wheels would have turned the crankshaft.
I would also guess an inital attempt at re-starting would have been tried. For sure that will turn the crankshaft.
This is how I see it.
Anyone have any thoughts on this ?
Am I wrong ?
Am I correct ?
~Spider~
2000 1.6 DOHC Lanos 'S'
Silver HB.
____________________
"The three great essentials to achieving anything worthwhile are; first, hard work, second, stick-to-it-iveness, and third, common sense."
- -- Thomas Edison
2000 1.6 DOHC Lanos 'S'
Silver HB.
____________________
"The three great essentials to achieving anything worthwhile are; first, hard work, second, stick-to-it-iveness, and third, common sense."
- -- Thomas Edison