Question about 1999 Daewoo Lanos

6 Answers

My 1999 daewoo lanos runs fine but when i go up hills or put it under load, mainly on the highway, it seems to drop in power ect. drop in cylinders like it is fueling up. when i pull over because of no power, but car is still idleing really rough, takes several minutes for car to idle as normal.... i have replaced coil packs, plugs, leads, timing belt, fuel filter and all other servicable items but problem is still there.. what could my problem be?

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  • 5 more comments 
  • staceymullen Mar 22, 2011

    when i pull off to the side of the road (still on a hill) and excellerate a few times the idoling eventually corrects itself. Could this happen if that were the problem?

  • staceymullen Mar 29, 2011

    Hi i have just had the fuel pump tested and this does not seem to be the problem. They replaced the crank sensor aswell but this still has not fixed tthe problem.

  • staceymullen Mar 29, 2011

    Hi, no smoke or anything blowing out back, and i have had my fuel pump tested but doesnt seem to be the problem. They have replaced my crank sensor but still.. no luck.

  • staceymullen Mar 29, 2011

    Have had my car hooked up for diagnostic but came back with nothing. I've been told that there will be no report without my 'check engine' light coming on, which it hasnt.

  • staceymullen Mar 29, 2011

    spark plugs, leads, fuel filter, coil packs, crank sensor, timing belt have all been replaced within the last 6 months.

  • staceymullen Mar 30, 2011

    Yes i had it done last week and it came back fine.

  • Leonard Martis
    Leonard Martis Aug 24, 2012

    if the oil has been very dirty aim shore it is the oil hols of the camshaft Ar block and make the engine very heavy

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6 Answers

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  • Master
  • 1,874 Answers

You need obligatory to access the Engine Control Module (ECM) using suitable diagnostic equipment connected to the data link connector of the car, in order to pull out all DTC (Diagnostic Trouble Codes) memored. Then you will be full informed about bad components, and you will be able to repair & replace bad pieces and reset the ECM.
Without access the ECM memory it's not a good idea to change pieces.
I suspect the MAF (Mass Air Flow) sensor, but connect first the diagnostic equipment and access the ECM memory.

Posted on Mar 23, 2011

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  • Master
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Hi stacey. These symptoms usually indicate that the transmission is either low on fluid or on it's last legs.

Check the transmission fluid and fill it to the full mark if that is the problem. If the fluid is full and it still stalls get it to a transmission shop like AAMCO. Joe

Thanks for choosing Fixya!

Posted on Mar 23, 2011

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  • Daewoo Master
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Hello
There are more than one reason for this, but the most common reason is that the spark plug wires are breaking down and shorting to the valve cover, this engine uses very long plug boots that go down inside the valve cover through a well, they tend to burn through or the spark plug wires get soaked with oil from a seal leak in the valve cover, I suggest you replace the plug wires and spark plugs, the wires just pull out of the valve cover, just do one at a time, that way you can't miss connect them. I would also consider replacing the fuel filter if it hasn't been done, the fuel filter is located on the firewall in the back of the engine compartment. It should be in the middle a little down from the top,it looks like a metal can with two metal pipes coming out of each end. The cylinder are numbered, see diagram, also a photo of the fuel filter.

1st the fuel filter
My 1999 daewoo lanos runs - emissionwiz_128.jpg 2nd the engine cylinder layout


emissionwiz_63.gif

Posted on Mar 22, 2011

  • yadayada
    yadayada Mar 23, 2011

    You don't really seem to need help based on the number of rejections, what is it YOU want to hear?

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  • Daewoo Master
  • 19,396 Answers

Hi.

To start do a compression test to exclude the possibility of head gasket or rings damage, and ensure that there is no engine damage of this kind.

If transmission is automatic, then it can be the auto tranny shifting in the high gear to early, or downshifting in low gear too late. In that case an expert hear should recognize the symptoms of the engine running with an incorrect gear.
If problem is transmission related, check the TPS and speed sensor.

Check the fuel pressure. If the fuel pressure regulator is bad, or if pump is defective, you may get symptoms that are similar to the ones you described. The fuel pump and pressure regulator are tested using a gauge like this:Lisle 20300.
The fuel pressure regulator is tested shutting down the engine and observing how pressure goes down.

The same gauge can also be used to check for vacuum leaks that may result in a lean mixture. I do not think that this is the problem, but better checking it. Vacuum leak test is done using the gauge in vacuum lines while heating them up or spraying carb cleaner on vacuum hoses. If there is a leak, the pressure will go up. Big leaks can be seen at a glance.

Check also MAF and AIT sensors. Clean or replace them. The two sensors located in the air intake determine how much air is going to be mixed to fuel.

Posted on Mar 22, 2011

  • Ginko
    Ginko Mar 22, 2011

    Hi.

    If it revs up by itself, then it can be the EGR valve.

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  • Daewoo Master
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Hi, I recommend you check your fuel pressure at the fuel rail on top of the engine. If you don't have a fuel pressure gage, perhaps you can borrow one or ask your mechanic to check the fuel pressure. The fuel pump should produce a minimum of 85 psi, which may be regulated to about 60 psi at the rail. With the engine running, pump the throttle to race the engine and see if the pressure rises at the rail. This will test your regulator. Low fuel pressure can cause the engine to run lean. I recommend you also check the regulator for a torn diaphram. To do this, pull the vacuum hose off the regulator, plug it with a golf tee, start the engine, and look to see if fuel comes out the open vacuum port of the regulator. This indicates a torn diaphram, which can cause the engine to run rich. Your regulator is attached to the fuel rail and is pictured below. The vacuum port is the one on top in this picture.

My 1999 daewoo lanos runs - jturcotte_357.jpg

Posted on Mar 22, 2011

  • 1 more comment 
  • Jeff Turcotte
    Jeff Turcotte Mar 22, 2011

    yes, if the pump is going bad, the reduced load allows the fuel pump to "catch up" with the fuel needs of the engine. Check your fuel pressure.

  • Jeff Turcotte
    Jeff Turcotte Mar 22, 2011

    By the way, you have just passed on my solution and will now get a solution from another expert. Not sure if you intended to do this or not, but I'm still willing to help you.

  • Jeff Turcotte
    Jeff Turcotte Mar 29, 2011

    Has anyone checked the fuel pressure regulator as I suggested? This is a very easy test--anyone can do it.

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  • Daewoo Master
  • 6,674 Answers

I would have it tested for possible plugged exhaust, such as catalytic converter. Increased fuel consumption, and/or engine running hotter than normal are possible symptoms of plugged exhaust as well.

Posted on Mar 22, 2011

  • Mike Butler
    Mike Butler Mar 22, 2011

    Sorry, my mistake, I didn't realize pulling over and waiting, fixed it temporarily. Has fuel pressure been tested? I assume you can accelerate slowly with out it happening on level highway?
    Any soot like film in tailpipe, after a good run and this occurs? Any smoke (black) out exhaust when it runs rough?

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