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Author Random misfire on fast idle part of emissions test.
Marshall
Member

Registered: 10th Nov 05
Location: Boston, Lincs Drives: 1.4 Sport & 2.2 astra
User status: Offline
25th May 07 at 18:56   View User's Profile U2U Member Reply With Quote

X14xe, has new plugs and leads. Ive tried a DIS off a scrappy and no change (i cannot be sure it was a good one since it was from a scrappy). The problem is, you can hear it popping now and then, which i think is the main thing throwing the emissions up. I sounds a bit like the exhaust backfiring , but only quiet faint. It has a cat and center silencer fitted, so there ought to be enough back pressure. It has std airbox and filter fitted.

The test results were:
2803rpm
1.08% vol Fail
256ppm Fail
1.207 Fail

then second go:
2820rpm
0.65% vol Fail
111ppm Pass
1.152 Fail

it passed the natural idle test with flying colours:
0.06% vol

Ive just fitted a new pattern cat, the car runs on premium fuel with fuel additives. ive just done a paperclip test which showed up lambda, but i was expected it to be worse on the HC part if it was the Lambda.

will probably be buying and fitting a new Gen. lambda in the morning, but does anyone have any over ideas.

[Edited on 25-05-2007 by Marshall]
mikehiow
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Registered: 12th May 05
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25th May 07 at 18:58   View User's Profile U2U Member Reply With Quote

Give CTS and coil a go as well, should be about a tenner for both of them from a scrap yard.

Also, try cleaning your lambda with some carb cleaner before shelling out on a new one.
Marshall
Member

Registered: 10th Nov 05
Location: Boston, Lincs Drives: 1.4 Sport & 2.2 astra
User status: Offline
25th May 07 at 19:03   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by mikehiow
Give CTS and coil a go as well, should be about a tenner for both of them from a scrap yard.

Also, try cleaning your lambda with some carb cleaner before shelling out on a new one.


what do you mean by coil? will give cleaning the lambda a try, as the readings dont seem that bad.
thanks for the quik reply.
mikehiow
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Registered: 12th May 05
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25th May 07 at 19:04   View User's Profile U2U Member Reply With Quote

The coil is bolted just infront of the battery on the right hand side of the engine, it's what gives the spark to the distributor.....
Marshall
Member

Registered: 10th Nov 05
Location: Boston, Lincs Drives: 1.4 Sport & 2.2 astra
User status: Offline
25th May 07 at 19:11   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by mikehiow
The coil is bolted just infront of the battery on the right hand side of the engine, it's what gives the spark to the distributor.....


i thought any coil would be integral to the DIS. do u mean like the lead to the ignition switch or the ecu...

does anyone know of a way to test the resistance of the primary/low- tension circuit safely. also is it worth checking any earthing points in particular.
craig_s
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Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
25th May 07 at 19:12   View User's Profile U2U Member Reply With Quote

your engine dosent have a coild.its dis pack.tried plugs and leads?

[Edited on 25-05-2007 by sri power]
Marshall
Member

Registered: 10th Nov 05
Location: Boston, Lincs Drives: 1.4 Sport & 2.2 astra
User status: Offline
25th May 07 at 19:17   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by sri power
your engine dosent have a coild.its dis pack.tried plugs and leads?

[Edited on 25-05-2007 by sri power]


yep, new gen. sparkies and leads. Would i acheive anything by stripping the DIS and looking for corrosion/ contact damage. maybe spray a bit of electrical cleaner and then dry it off, or wud this cause more trouble than its worth.
craig_s
Member

Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
25th May 07 at 19:19   View User's Profile U2U Member Reply With Quote

would help at all/if the dis pack is breaking down then thats it its nackered.does the eml light come on?
mikehiow
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Registered: 12th May 05
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25th May 07 at 19:21   View User's Profile U2U Member Reply With Quote

x14xe, I sorry, I got mixed up, was thinking of 1.4 8v.

Still, a DIS pack from scrappy shouldn't be too much either, I was quoted around £15 iirc for a 20XE one when I had my calibra.
Marshall
Member

Registered: 10th Nov 05
Location: Boston, Lincs Drives: 1.4 Sport & 2.2 astra
User status: Offline
25th May 07 at 19:23   View User's Profile U2U Member Reply With Quote

eml sometimes comes on after 20-30minutes of running and shows EGR fault (probably to do with the aftermarket inlet manifold) and a Heated exhaust gas sensor (lambda) fault.
craig_s
Member

Registered: 5th Mar 06
Location: Birmingham Drives: mk4 astra gsi
User status: Offline
25th May 07 at 19:24   View User's Profile U2U Member Reply With Quote

could be your lamba sensor.but i dont think that would make it miss fire

 
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