1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. It's been bought to our attention that certain users are spamming new and existing users with links to their own websites. This is not permitted on VxON.
    Should you receive such a message, please report this using the 'Report' link you will find at the bottom of the message.
    Those users will then be dealt with accordingly.
  3. Use The Search Function That's what It is There For!
    The chances are that the post you are about to make has already been asked so USE the search function first! You can either search JUST this forum by clicking on the search button on the top right (under the page numbers) or click on the main search button that is on the top tool bar.
    This will save you time and stop the same duplicate posts from appearing.

[Astra Mk4/G] [98-04] Astra G - 1.4 16v Misfire - Loss of Power

Discussion in 'Astra, Corsa, Zafira, Meriva, Adam, Agila, Tigra & Nova [Includes AstraVan & ComboVan] owners forum' started by revolt, Nov 2, 2010.

  1. revolt

    revolt Member

    Messages:
    9
    Likes Received:
    0
    Location:
    Newport
    Hi,
    I have a Vauhall 51 Plate 1.4 16v Petrol Astra. For a while now the EML has been on and this is due to the car having multiple misfire, misfire in the 3rd cylinder. I have had it into a garage and everytime I have it back it will run for a week or two and then start misfiring again.
    At the garage I have had a compression test done and the results are correct, replaced the fuel rail, spark plugs, coil pack (first a new delphi and then a 2nd hand original manufacturers), it has gone to an auto-electrician and they found no problems. I have cleaned up the EGR valve to see if any performance gain but to no luck.
    The car feels clunky turning over and when travelling it feels as if I have gone up too many gears the feel of no power to go forward (almost as if the engine is sufficating). I have to stop the car on the trip to work (luckly only 4 miles) and when it starts again its pot luck it will either run well or clunky again. If you can help me as I do like the car but not the problems!!

    Regards,Mark
     
  2. anth1718

    anth1718 VxON Club Member VxON Club Member

    Messages:
    1,429
    Likes Received:
    45
    Location:
    newcastle uk
    Drives:
    1.6 16v astra g sxi
    have you tried cleaning out the throtle body?
     
  3. revolt

    revolt Member

    Messages:
    9
    Likes Received:
    0
    Location:
    Newport
    No I have not, just found how to do this on this website so will give it a go on the weekend, which gasket do I need as it says to use new ones. Would wd40 and elbow grease be ok to clean it out. Thanks for any advice
     
  4. anth1718

    anth1718 VxON Club Member VxON Club Member

    Messages:
    1,429
    Likes Received:
    45
    Location:
    newcastle uk
    Drives:
    1.6 16v astra g sxi
    im not sure on gasket i managed to clean mine without removing as it wasnt that bad i wouldnt use wd40 as this is oilly and leaves a coating use carb cleaner or brake cleaner any residue will evaporate
     
  5. revolt

    revolt Member

    Messages:
    9
    Likes Received:
    0
    Location:
    Newport
    Ok thanks, will give it a go and post back.
     
  6. revolt

    revolt Member

    Messages:
    9
    Likes Received:
    0
    Location:
    Newport
    Update:

    As directed I have cleaned up the throttle body with carb cleaner on the weekend(now a lovely aluminium colour). On the drive in to work this is what I have observed.

    The car in idle is much improved it has now lost its clunky feel. The drive in to work was two fold, firstly the car was running great, responding well and felt as if no problems ever existed. Then running at about 30mph the EML started to flash, When I stopped for traffic lights the idle was dipping down to around 500 rpm and would go back to 800ish rpm (this was up and down) it also felt as if I had no power again trying to accelerate so I pulled over and turn the engine off for 30 sec's turned it back on and the car was very responsive, idle was around 900-1000rpms and I could pull away as it should.

    It seems as if part of the problem is addressed but any ideas on the above?

    Also Noticed ** The tube that goes to the throttle body has a small tube attached to it which goes into the engine or fuel rail (I think) this had a white cream inside so I cleaned this out also. Will post picture later.


    Thanks.

    Mark
     
  7. anth1718

    anth1718 VxON Club Member VxON Club Member

    Messages:
    1,429
    Likes Received:
    45
    Location:
    newcastle uk
    Drives:
    1.6 16v astra g sxi
    what is the oil like on the dipstick and filer cap any white gunk there? is there any sighn of oil in the water resivour? if the eml has been on it should have left a code have it read and come back with the code also get them to clear it see if it comes back it may be worth checking the throtlebody again pay attention to the air passages it is possible you fixed the fault but maybe it has dislodged crud elswere which is now blocking it again also worth checking the egr again to make sure the pin is free to move
     
  8. revolt

    revolt Member

    Messages:
    9
    Likes Received:
    0
    Location:
    Newport
    Hi,

    Update : Check the oil and that is ok. The white gunk was from a breather tube (this is ok).

    Had the codes read for the fault and it was P0301 Cylinder 1 misfire. I had this code cleared and was talking to the mechanic about the throttle body and ICV (engine was idling), whilst we were he noticed the car started to misfire again so put the code reader back on this time it showed multiple misfire.

    At this point he started to read off the different sensors and if they were inside the normal parameters (engine ticking over with misfire and had not been turned off whilst this was happening), on the O2 sensor (lamda i think) the readings were between 30mV (idle) - 22mV (accelerater peddle pushed) and the fuel was running lean (engine had not been turned off since the misfire was noticed) and the O2 sensor loop was open, Ok so i suggested turning the engine off waiting then restarting it to see if any difference, the readings for the O2 sensor read as 80mv - 800mv (this was in idle and in the correct range he was expecting) and the fuel was changing from lean to rich back (as it should do) and forth, the O2 sensor loop was closed and the engine run much better as well as if no problem.

    So could the O2 sensor be faulty?

    Mark
     
  9. anth1718

    anth1718 VxON Club Member VxON Club Member

    Messages:
    1,429
    Likes Received:
    45
    Location:
    newcastle uk
    Drives:
    1.6 16v astra g sxi
    strange it started as cyl 3 now number 1 my gut instinkt is saying not o2 sensor as this engine code dose not relate to this i looked up the code and the description is the same as he gave you theres a few codes for o2 but not this one but for £30 to £50 may be worth trying. have you tried redex with the fuel rail been off and throtle body been off could be crud in the fuel line.but it sorted itself when the engine started to cool ive had a simalr problem and fixed it with the third coil pack it was ok when first started then as the engine warmed up it missfired bad could you borrow a known good one from a friend?
     
  10. anth1718

    anth1718 VxON Club Member VxON Club Member

    Messages:
    1,429
    Likes Received:
    45
    Location:
    newcastle uk
    Drives:
    1.6 16v astra g sxi
    have you tested the coil pack? worth ago take it out take out plugs push them into coilpack lie the coilpack so the plug earths off the engine take the fuse out for the fuel pump or the relay have somebody turn it over and watch to see if all the sparks are good
    obviously you proberly be better to wait till you have the problem when i had this problem i just took pot luck and i was correct the above test didnt work for me
     

Share This Page