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[Astra Mk4/G] [98-04] Astra / Vectra / Zafira Poor Idle, Hesitation & Cutting Out Help Thread

Discussion in 'Astra, Corsa, Zafira, Meriva, Adam, Agila, Tigra & Nova [Includes AstraVan & ComboVan] owners forum' started by digidaz, Sep 30, 2005.

  1. digidaz

    digidaz New Member

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    Right everyone! as far as I know I cannnot stick my post at the top of this thread because its already been posted. A new merged post will only be added to the bottom so ive had to hijack this post slightly lol

    Anyway, a lot of people have idling/hesitation problems with their MK4's, so as Daz has already done quite a bit of fault finding on his 8V MK4 I thought I would use this thread so we can knock heads about all MK4 idling/hesitation problems. Btw If you are going to illustrate your posts with pictures, pls make sure you either back them up or move them to a server where they arnt going to be deleted as this thread could be running quite some time (y)

    CavWebmaster


    BEFORE YOU DO ANYTHING, IF YOU HAVE ANY SORT OF:

    Idling problem - Erratic idling and maybe dropping low enough to cut out
    Hesitation or holding back when accelerating
    Kangarooing - jerking usually when in a high gear and a lowish speed

    Astra MK4s are prone to gunking up the throttle body with oil vapours which when cooled goes hard. Faults of cutting out, lumpy idling and kangooring when driving can be attributed to a manked up throttle body and if not checked first a garage could rip you off big time as It can seem like an electrical fault (Plugs, leads, EGR, Air Flow meter)
    Its a 10 min job for yourself to check as all you need to remove is jubilee clip that secures the air flow pipe (the one that come from your airbox) to the throttle body and look inside. Mk4s for some reason can use a sugar load of oil with no smoke and it will pass its emissions fine. If you have a mk4 thats a few years old (like mine is) and have any sort of engine running problems i would check the throttle body before you do anything as when mine was running really badly the throttle body was absolutely caked in hard oil. Once I had removed the throttle body (mine was far to caked to clean on the car so see your manual if you intend to clean off the car) and totally cleaned out the TB it ran like a dream and only cost the price for a tin of cleaner spray :)

    ------------------------------------------------------------------------------



    Hello all

    This is a long post, so settle down with a Cuppa and I hope it may help someone, someday.

    I think over the last few days I have read nearly every post in my attempt to find and fix a fault on my recently bought astra.

    After collecting the car from Cambridge and setting off down the A1 to the south coast the car seemed to be running "rough" with hesitation evident when "in the cruise". Then I hit the M25 roadworks. 'Oops, I stalled it'. Ooops, again? I don't think so. It stalled itself.

    Temp showed Normal

    No Lights, temp/oil/ECU

    OK, plod on and get her home.... Fuel consumption also seemed a bit heavy, but this was my first Vauxhall....

    Investigation starts:

    1. Breathers - All ok, clear.
    2. Intake air leaks. - none
    3. Air Filter - Ahhhh. BLACK.... changed (£8), test drive. Same dodgy idle and acceleration
    4. OK, I can do this. Search the net for help. Found this forum and started reading.
    5. No point in reading ECU as no light seen. (error)
    6. Clean Idle control stepper motor. - Idle now stable, no more stalls, but still hisitation on acceleration. We go on...
    7. Disconnected O2 sensor - Ahhh... that's better, idle ok and pulls better, replace with new O2 sensor (£39)
    8. Drove well for about 10 miles, then back came the symptoms.
    9. Check and changed Plugs (£18) - still the same
    10. Cleaned all fuel areas - Thorough to the letter - still the same.
    11. Back to the forum - OK, EGR perhaps? Cleaned - same.. Do I buy a new one? Damn, £70... oh well, got the car cheap so go for it. - Same symptoms again.
    12. Read that it could be the Temperature sensor - OK, £11, in for a penny...(lots of them) - result... nope, same hesitation...
    13. Rechecked all of the above. I am now a master at this.... or am I?
    14. OK, forum tell me it could be the MAP sensor. This time none in stock at local Vaux dealer, so down to scrappy... Yep.. £8.81 (bargain) But, still no change.
    15. Do an ECU reset, lets see if it needs it. Memory cleared, not that I had checked it. (error)
    16. So, what more can I do? The only improvement was the stepper motor clean which made the idle 100%.... But the forums are also telling me to get a new one.... OMG... another £75, and no guarantees.... OK, last time I go into that parts shop...

    YES, YES, YES.

    Hesitation Gone, idle perfect..... I am soooo good... NOT !!!

    I bet if I had read some codes from the ECU I would have seen the Stepper Motor error, but oh no, I just cleared All Previous Error codes didn't I.

    Spent perhaps £130 I didn't need to spend and got through perhaps £30 of petrol road testing it.

    This is posted for those like me who think they KNOW what's wrong and for general information. The ECU is a smart bit of kit, USE IT. READ IT. BELIEVE IT.
     
    Wilts, 2vaux_al81, deep dish and 3 others like this.
  2. cavwebmaster

    cavwebmaster CavWeb/VxON Forums Admin & Founder Staff / Administrator VxON Club Member

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    Your loss is everyone with the same problems gain, unfortunately for you. Ive got a similar problem on my 1.816v MK4 Astra with kangarooing and stalling. When its first started up the auto choke makes it idle at just above 1000 RPM but this drops off way before its warm. When I come to a stop and take it out of gear the revs drop to 500 RPM, then yoyo back upto around 900 (although when it drops to 500 RPM the lights dim briefly it doesnt usually stall but sometimes it does) It drives fine when in this state but I do wonder if its gonna drop low enough to stall but i find that when my steering is turned at low revs it stalls quite alot. Also sometimes when im coming to a stop it drops to 900 RPM and doesn't yoyo at all BUT when changing gear it feels like there is a misfire and its not a fluid change.

    Im hoping I don't have to spend a fortune finding out this problem cos money is tight and im equally hoping that someone else has had a similar problem and sorted it out.
    Ste
     
  3. bt_cav

    bt_cav New Member

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    did you have any bother with the EGR valve bolts? I had thought about giving mine a clean out but the bilts were solid and did'nt want to risk sheering them. (if its working Leave it alone)
     
  4. Delbert

    Delbert Well-Known Member

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    Further to my previous entry regarding cleaning the EGR valve, it did return.

    Following which then I cleaned the throttle valve. You know, all the black crap that accumulates in the intake where the butterfly valve closes (the breather and canister vents seemed clear). After which I could then see light through the small gap around the butterfly when in the closed position. Anyway, car runs perfectly now. Hopefully it'll be for a longer period than when I cleaned the EGR valve!!!!
     
  5. cavwebmaster

    cavwebmaster CavWeb/VxON Forums Admin & Founder Staff / Administrator VxON Club Member

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    Location:
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    Drives:
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    I also cleaned out my throttle body housing as it was caked with black sludgy oil. After removing 4 pipes, 1 connector and 4 bolts I was able to remove the throttle body from the manifold and inspect it. My first job was to remove the 2 bolts that attach the butterfly flap to its pivot arm, open the throttle and remove flap. This made cleaning up the throttle body, unclogging the 2 air holes and then cleaning the flap much easier. My 16v 1.8 now runs as sound as a pound and actually runs alot better than when i bought it so its all good (y) Rather worrying is the litre of oil it consumes in 2 weeks but it doesn't smoke in the slightest or increase emissions :mmmm (although I have read that these engines use alot of oil anyway)
    Ste
     
  6. pitch_black

    pitch_black New Member

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    I've had the same problem with poor performance, fuel economy and random cutting out. The engine management sign was the only indication as to what it could be. I took it to the vauxhall garage and they diagnosed it for £70!!!!!! It needed a new Coil Pack, Spark Plugs and an Oil change. Now that the problem has been fixed, the car is running fine, with non of the symptoms specified above.

    Cheers,

    Nick
     
  7. h_19ASTRA

    h_19ASTRA New Member

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    had all this with my 1.8 astra sxi

    had egr valve replaced and throttle body cleaned out.

    its now fine (y)
     
  8. pitch_black

    pitch_black New Member

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    Forget what I said before, the problems back!!!! Engine management light flashed briefly on the journey home, then the car cut out as i pulled into the drive. Couldnt get it started again. Engine is turning over fine but it wont fire and start, madness!!! Garage is pickin it up this morning!

    The plot thickens!!!!

    cheers

    Nick
     
  9. graham_alton

    graham_alton New Member

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    I am 1 month down the line of having the stall/hesitation/cut-out problem and have been using my local garage to determine what the problem is at very little cost so far. I finally persuaded my mechanic to call in a favour from an old mate (who works for a Vauxhall dealer) to get some info on what the problem could be.

    We've unearthed some surprising admisions from Vauxhall which have not been made public and are seemingly just fixed without the owners knowledge by Vauxhall dealers during regular service. My local garage is not a Vauxhall dealership, however, hence why we think I have come across the problem - don't know if that holds true for everyone else here.

    The solution seems to be (for me I hope anyway, car booked in tomorrow), to either remove the EGR from the system or put a small bracket on the existing EGR in order to force it to stay open i.e. prevent problems when it gets stuck closed (I've had that issue previously too). The bit you need a Vauxhall dealer for is to update your ECU firmware/software such that the engine can now operate cleanly without the EGR in place.

    As I said, this is a known problem/solution to Vauxhall service so if you probe your local dealer you will probably get them to admit to it, failing that just take it in and get it done.
     
  10. graham_alton

    graham_alton New Member

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    Arrived back home this morning after what seems to be a relatively positive experience. In and out of the garage in just over 30 minutes after they did what they call a "Re-flash" which is pretty much exactly what I described earlier.

    I am £38.34 GBP worse off now, but the car is idling better already and drove home perfectly. The 15 mile journed back home clearly isn't a fool-proof test but it does seem to have cleared up some niggles and I hope it fixes the main issue too. I'll try to remember to post back here after I've driven it for a while!
     
    Car Astra likes this.

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