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Old 24th August 2007, 22:23   #1
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Default Opel Astra misfire/backfire

Guys

We have an Opel Astra that is stationed in Chennai and driver is reporting engine misfires and backfires. I guess its OK when driven gently but when you step on it you can hear firecrackers going off.

Since my dad is here in the US, we have told him to minimize driving.

Any idea what its could be? I did some research on the web and its pointing to either a MAF issue or an ignition module issue. Anybody faced the same problem?
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Old 24th August 2007, 22:47   #2
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mostly it should be a bad spark plug and or bad fuel. replace all plugs and drain out the fuel if it was filled up at a non normal filling station. should solve the problem
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Old 24th August 2007, 23:57   #3
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Most likely Bad Plugs, Check them and Replace if needed- Also have the Throttle and Air Filter Cleaned, In most cases these 3 things can have the PATAKA Effect coupled along with Poor Pickup,Bad FE and ofcourse the Misfires.
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Old 25th August 2007, 00:18   #4
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In my opinion its bad plug wires. See if it works ok with new HT plug cables.
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Old 25th August 2007, 00:28   #5
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Deep you might also check if this issue has started recently (during monsoon)? Increase in moisture = may a cracked coil pack and/or cracked plug wires = misfire/backfire?

I have been told (gti-vr6.net) that after market plugs (4 - point iridiums) are not good on several german cars so maybe that could be an issue too.
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Old 25th August 2007, 00:34   #6
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I think we can rule out the bad fuel part since new fuel has already been tried. If its indeed is the plugs then I am happy since its a cheap fix.

If I am not mistaken, misfires are caused because the plug is firing at the wrong time. That's why I have this nagging feeling that its the ignition module(elecrtonic distributor) that is causing this issue.
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Old 7th August 2008, 00:23   #7
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I had the same problem too. Get your vehicle to a genuine GM service center and they will take care of it. you can check if it is a ECU problem. you have to change your ECU unit if it has gone bad. or may be fixed if in a good condition. And it also may be a timing issue. GM will be the best people to assist you further. I strongly recommend you to take your vehicle to those guys. and if you want to increase your vehicles FE, pm me. I get a FE of 18km/L in city and 21km/L on highways. Beautiful technology installed in my OPEL ASTRA
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Old 27th April 2009, 20:35   #8
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Hi you could get the distributer point cleaned and get the distributer wires which are connected to the plugs changed and as well take off the distibutor service it fit it back and get the car retimed.this should sort it out.
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Old 28th April 2009, 09:22   #9
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Hi people my dads astra is excellent but just one things bothering me. Since a few weeks the car is running at around 100 Degs with the air conditioning on.
Without the AC it runs at 90 Degs.

I have noticed THE HIGH SPEED FAN ONLY COME ON AT 100 DEGS and going off at around 95 degs .

Guys is this the normal for astras? people at GM dealership say so.

Any suggestions from are welcome.

Opel owners please let me know the operating temp with AC.

Regards Abhishek
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Old 28th April 2009, 09:56   #10
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Quote:
Originally Posted by abhishek_5 View Post
Since a few weeks the car is running at around 100 Degs with the air conditioning on.Without the AC it runs at 90 Degs.
I have noticed THE HIGH SPEED FAN ONLY COME ON AT 100 DEGS and going off at around 95 degs .
This used to be the case with my 1996 Astra. The 1997 model however had the temp set for 95 deg before the fan came on. I dont have my Astra any more but am told that this could be fixed and redced to 95 deg by a competent mechanic.

Quote:
Originally Posted by Mpower View Post
That's why I have this nagging feeling that its the ignition module(elecrtonic distributor) that is causing this issue.
Quote:
Originally Posted by RacingHart View Post
you can check if it is a ECU problem. you have to change your ECU unit if it has gone bad.

I get a FE of 18km/L in city and 21km/L on highways. Beautiful technology installed in my OPEL ASTRA
Yes I too believe it is something more than just faulty wire or spark plugs. I would request the help from a competent mechanic (GM or otherwise) who has the tools to diagnose this.

How do you get 18-21kmpl. My Astra used to average 7-8kmpl in Mumbai city.
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Old 28th April 2009, 10:12   #11
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Thanks for the reply Navin. Mine is a 98 Astra. Could you specify if possible what can be done to keep it going at around 95 degs.
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Old 6th October 2010, 03:01   #12
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Quote:
Originally Posted by navin View Post
This used to be the case with my 1996 Astra. The 1997 model however had the temp set for 95 deg before the fan came on. I dont have my Astra any more but am told that this could be fixed and redced to 95 deg by a competent mechanic.
Yes I too believe it is something more than just faulty wire or spark plugs. I would request the help from a competent mechanic (GM or otherwise) who has the tools to diagnose this.

How do you get 18-21kmpl. My Astra used to average 7-8kmpl in Mumbai city.
I got the vehicle's engine groomed. I replaced the ECU with an aftermarket ECU. I have installed IRX iridium spark plugs, K&N filter, and Free flow (Magnaflow), and a mielage regulator. That should do the trick.

And yes, also add System-G that you can avail from GM and add 1 ml for every litre of petrol and you are on.
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Old 6th October 2010, 04:55   #13
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Sorry I didn't update. Car went to 2 different mechanics and everything from spark plugs, wires and ignition module got replaced. Runs fine now and costed around 15K.
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