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TOPIC: Misfire-solved
#58057
Misfire-solved 6 Years, 4 Months ago Karma: 12
So as some of you may or may not know I have been chasing my tail for the last four months trying to solve a misfire that has had my head wrecked.

After a long and painfull journey, it was the lambda sensor causing the miss.

Turns out that not all componant malfunctions are picked up by the ecu

I can at last enjoy my car

P.s I hate misfires
Mister Two
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Last Edit: 2013/05/12 10:42 By Mister Two.

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#58071
Re: Misfire-solved 6 Years, 4 Months ago Karma: 213
I meant to ask - was the miss consistent ? Mine seems to have an intermittent miss which I can only notice at idle.

Also - starter motor turns a goid bit before it eventually fires / starts. Did you have that problem as well ?

Did you go for a new or used lambda sensor ?
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#58072
Re: Misfire-solved 6 Years, 4 Months ago Karma: 12
Mine was predominantly at idle, but occasionally also at 3-3500 rpm.no cranking issues.

My advice to you would be

1) check ignition timing-often a cause of idle misfire.
2) check all ignition components. Plugs, leads, rotor and dizzy cap. Also pull your ignition coil and test it with a multimeter. It cranking for a while would make me think it wad ignition related- but i could be wrong!
3) lambda sensor is a common cause of idle misfire. In a lot of cases, malfunctioning components won't always cause the ecu to store a fault code, which can throw you off the right course of action to take-this is particularly true of the lambda. A faulty lambda may also cause your engine to run rich or lean-check the plugs to confirm either situation.
4) its also possible that your throttle position sensor could be at fault. Very easy to do with some feeler gauges and a.multimeter.

Other possible causes-fueling issue such a failing pump or lack of fuel pressure, though that would be very obvious-struggling to accelerate or get up a hill etc.
compression issues can be a cause as well as vacuum leaks.

Go with the first 4 points to start with. They are all easy to check yourself, just get yourself a multimeter and refer to the bgb.

If ya need any help just ask
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Last Edit: 2013/05/12 22:13 By Mister Two.

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#58096
Re: Misfire-solved 6 Years, 4 Months ago Karma: 80
a long last well done kc
cozzy90
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#58101
Re: Misfire-solved 6 Years, 4 Months ago Karma: 12
cozzy90 wrote:
a long last well done kc

Thanks Cozzy-At times I felt Id never get it fixed but it feels really rewarding getting it sorted in the end. And as a bonus-Im now far more able to work on the car than I ever was-just 5 months ago I was too scared to even to pull a lead on a spark plug
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Last Edit: 2013/05/13 20:57 By Mister Two.

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#58115
Re: Misfire-solved 6 Years, 4 Months ago Karma: 80
ya i remember saying dizzy cap and you didnt have a clue what that was now u know enough to tip away at the car when it needs doing next thing on my list is the best way to change the timming belt i think i have an idea when i actually get the parts ill be studying it on you tube and the forums
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#58149
Re: Misfire-solved 6 Years, 4 Months ago Karma: 213
Mister Two wrote:
Mine was predominantly at idle, but occasionally also at 3-3500 rpm.no cranking issues.

My advice to you would be

1) check ignition timing-often a cause of idle misfire.
2) check all ignition components. Plugs, leads, rotor and dizzy cap. Also pull your ignition coil and test it with a multimeter. It cranking for a while would make me think it wad ignition related- but i could be wrong!
3) lambda sensor is a common cause of idle misfire. In a lot of cases, malfunctioning components won't always cause the ecu to store a fault code, which can throw you off the right course of action to take-this is particularly true of the lambda. A faulty lambda may also cause your engine to run rich or lean-check the plugs to confirm either situation.
4) its also possible that your throttle position sensor could be at fault. Very easy to do with some feeler gauges and a.multimeter.

Other possible causes-fueling issue such a failing pump or lack of fuel pressure, though that would be very obvious-struggling to accelerate or get up a hill etc.
compression issues can be a cause as well as vacuum leaks.

Go with the first 4 points to start with. They are all easy to check yourself, just get yourself a multimeter and refer to the bgb.

If ya need any help just ask


Thanks. I had my ignition timing checked a good while back. And i also changed plugs, leads etc. But this has been going n for so long now that i probably need to check everything again in one go.

I've to sort a new chargecooler setup as well. So, might tackle it all at once.

Just need to wait until someone invents 36 hour days now and i'll have the time to do it all : )
Spidey
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I promise, this is going to be my last mod ....

3S-GTE Power Primer !
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