engine runs rough, poor accelleration

delphis · Post by **delphis** » Fri May 20, 2005 4:17 pm

is there a specific size that I will need for this gasket, and is it something that I can do on my own time?

Audacity Racing · Post by **Audacity Racing** » Fri May 20, 2005 4:20 pm

buy the one from 360. it's less than 20 bucks (us). i guess you could also check autozone or some other chain... but odds are it'll be pricey from them!

MMamdouh · Post by **MMamdouh** » Fri May 20, 2005 4:57 pm

delphis wrote:is there a specific size that I will need for this gasket, and is it something that I can do on my own time?

their is no sizes involved just get the one for the 1.6 DOHC (that is the engine you got... right??).

it is a fairly easy job to do and i think you can do it yourself... remember to clean every thing up before you install the new gasket.

MMamdouh

dan-d · Post by **dan-d** » Fri May 20, 2005 9:28 pm

daewooluvr wrote:
dan-d wrote:I don't know where else to post this so I thought i'd try it here.

I have a 99 Lanos and the engine sometimes run's rough at idle, but with a little throttle it smooths out real nice. Too much throttle and it act's like it's starving for fuel. When I drive it, it accellerates great as long as I ease the gas up to about 1/4 throttle, open it up any wider and it stumbles real bad and bogs down. It does have a CEL. I plan on taking it to AZ for a scan but can't get to it for a while since there aren't any AZ's real close. I was hoping someone here would have some ideas.
Hey Dan-D,
Any luck with this issue yet?

Not yet Shaun but I'm still working on it. I'm getting a code P0342 which say's "Camshaft Position Sensor A-Bank circuit low input". I'm still trying to figure out what this means. I'm not sure if it means the sensor is bad or if whatever is supplying it voltage is bad. I've looked all through the manual and it doesn't have anything at all about a cam position sensor, only the crank position sensor. I know it has a cam position sensor cause it's right there in between the cams.

MMamdouh · Post by **MMamdouh** » Fri May 20, 2005 9:51 pm

yeah the thing between the cam gears is the CMP... here is a pic of it compared to the one on an aveo.

chris from daewootech yahoo group is using the aveo one on his lanos, it worked fine so far.

MMamdouh

daewooluvr · Post by **daewooluvr** » Fri May 20, 2005 10:58 pm

dan-d wrote:
daewooluvr wrote:
dan-d wrote:I don't know where else to post this so I thought i'd try it here.

I have a 99 Lanos and the engine sometimes run's rough at idle, but with a little throttle it smooths out real nice. Too much throttle and it act's like it's starving for fuel. When I drive it, it accellerates great as long as I ease the gas up to about 1/4 throttle, open it up any wider and it stumbles real bad and bogs down. It does have a CEL. I plan on taking it to AZ for a scan but can't get to it for a while since there aren't any AZ's real close. I was hoping someone here would have some ideas.
Hey Dan-D,
Any luck with this issue yet?
Not yet Shaun but I'm still working on it. I'm getting a code P0342 which say's "Camshaft Position Sensor A-Bank circuit low input". I'm still trying to figure out what this means. I'm not sure if it means the sensor is bad or if whatever is supplying it voltage is bad. I've looked all through the manual and it doesn't have anything at all about a cam position sensor, only the crank position sensor. I know it has a cam position sensor cause it's right there in between the cams.

Hey Dan,
Both of these sensors have been very problematic and there's even a safety recall for the cam positioning sensor due to some engine fires. If I were you I'd schedule an appointment with the dealer to have it replaced for free.
Hope this helps,

dan-d · Post by **dan-d** » Mon May 23, 2005 10:06 pm

Well here's the latest. This has nothing to do with the poor running but it's something that had to be done. I replaced the timing belt, idler pulley, and tensioner and although a PITA it's all back together again.

Now for the running issue. The only two codes I get are still #4 cylinder misfire (it's intermittent), and the other was Cam Position Sensor low input. I got rid of the cam sensor issue by replacing the (CMP) sensor, but I still get a #4 misfire code and it's still intermittent. I replaced the plugs, plug wires, and swapped around the injectors and the misfire still only occurs in #4 cylinder and it's still an intermittent problem. My thought's now are focused on the coil sinced I ruled out compression, plugs, plug wires, and injectors. Any thoughts?

Remember, whatever this is, it only affects #4 cylinder.

MMamdouh · Post by **MMamdouh** » Tue May 24, 2005 6:03 pm

swap the sockets on the coil for cylindes 1 and 4 and see the code again... that is swap the coil sockets A and B that are shown in the diagram here:
http://www.daewootech.com/forum/viewtopic.php?t=2634

if the code is the same then the problem is not in the coil but if it changed to misfire on cyl. 1 then it is the coil.

MMamdouh

daewooluvr · Post by **daewooluvr** » Tue May 24, 2005 6:29 pm

mmamdouh wrote:swap the sockets on the coil for cylindes 1 and 4 and see the code again... that is swap the coil sockets A and B that are shown in the diagram here:
http://www.daewootech.com/forum/viewtopic.php?t=2634

if the code is the same then the problem is not in the coil but if it changed to misfire on cyl. 1 then it is the coil.

MMamdouh

^^ AGREED.

Hope this helps you figure it out. Also if it does end up being the coil there are always some on Ebay.

dan-d · Post by **dan-d** » Tue May 24, 2005 6:42 pm

daewooluvr wrote:
mmamdouh wrote:swap the sockets on the coil for cylindes 1 and 4 and see the code again... that is swap the coil sockets A and B that are shown in the diagram here:
http://www.daewootech.com/forum/viewtopic.php?t=2634

if the code is the same then the problem is not in the coil but if it changed to misfire on cyl. 1 then it is the coil.

MMamdouh
^^ AGREED.

Hope this helps you figure it out. Also if it does end up being the coil there are always some on Ebay.

Hmmm, I completely forgot that this system fires two cylinders at the same time. I'll swap them and see what happens.

dan-d · Post by **dan-d** » Wed May 25, 2005 12:27 pm

Update: Well I swapped plug wires 1 & 4 at the coil and sure enough the problem went to #1 cylinder so this tells me I have a bad coil. I also did a fuel pump pressure test and it's extremely low. So now I have a fuel pump and coil on the way. I'll let you know the results after I install these new parts. Thanks again, Dan

daewooluvr · Post by **daewooluvr** » Wed May 25, 2005 1:15 pm

dan-d wrote:Update: Well I swapped plug wires 1 & 4 at the coil and sure enough the problem went to #1 cylinder so this tells me I have a bad coil. I also did a fuel pump pressure test and it's extremely low. So now I have a fuel pump and coil on the way. I'll let you know the results after I install these new parts. Thanks again, Dan

hmm yeah the fuel pressure should be somewhere around 32-36psi.
Have you replaced the fuel filter recently? You may want to try to replace that first before replacing the pump.
Where did ya order the parts from? I usually go to www.gm-car-parts.com
They have good customer service and the prices aren't bad.

Well good luck with fixing it. Let us know how it turns out.

dan-d · Post by **dan-d** » Sun Jun 05, 2005 12:07 am

daewooluvr wrote:
dan-d wrote:I don't know where else to post this so I thought i'd try it here.

I have a 99 Lanos and the engine sometimes run's rough at idle, but with a little throttle it smooths out real nice. Too much throttle and it act's like it's starving for fuel. When I drive it, it accellerates great as long as I ease the gas up to about 1/4 throttle, open it up any wider and it stumbles real bad and bogs down. It does have a CEL. I plan on taking it to AZ for a scan but can't get to it for a while since there aren't any AZ's real close. I was hoping someone here would have some ideas.
Hey Dan-D,
Any luck with this issue yet?

Shaun,

Everything's good now. I replaced the suspected bad coil and now she's hitting on all four. So now with all new belts, a fresh tune, new fuel pump and filter I'm looking to get a lot of good miles out of her. Thanks for all your help as well as the others who've chimed in on this topic.

-Dan

The original daewootech forum

engine runs rough, poor accelleration

Re: engine runs rough, poor accelleration

Re: engine runs rough, poor accelleration

Re: engine runs rough, poor accelleration