miss fire

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miss fire

Post by st1allstar on Mon Jul 15, 2013 10:42 pm

upon driving my newly purchased uno home it has developed a miss fire just coming off the motorway (luckily) the rev counter is under reading, and it sounds like a scooby with little power,

i did a compression test which showed good compression on all cylinders,

i replaced all 4 spark plugs and no difference has been made along with the dizzy cap and rotor arm,

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Re: miss fire

Post by charliemk1 on Tue Jul 16, 2013 7:45 am

Have you worked out what cylinder(s) is down?

Wild guess is blown head gasket between 2 and 3
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Re: miss fire

Post by st1allstar on Tue Jul 16, 2013 7:50 am

its down on cylinder 2, i've removed the spark plug and cranked the engine over and with the ht lead connected there is no spark, i connected the lead from cylinder 1 and the spark plug lights,

i've compression tested all cylinders and they are showing 11 bar each

im going to go down to a motor factors tomorrow and see if i can pick up a new dizzy cap, rotor arm and a set of ht leads
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Re: miss fire

Post by charliemk1 on Tue Jul 16, 2013 7:57 am

Problem solved then Mark, as no 2 wont fire with no spark:) 
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Re: miss fire

Post by robr33gts on Tue Jul 16, 2013 9:41 am

could be the leads then as you say
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Re: miss fire

Post by st1allstar on Sun Jul 21, 2013 5:06 am

changed the plugs, dizzy cap, rotor arm and ht leads and no difference its still running on 3 cylinders
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Re: miss fire

Post by robr33gts on Sun Jul 21, 2013 7:12 am

injectors ? is it sparking on all four now ?
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Re: miss fire

Post by st1allstar on Sun Jul 21, 2013 11:44 am

No it's not sparking cylinder 2, I've done the tests on the ignition ecu as per the Haynes manual and 've got it down to the ignition coil
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Re: miss fire

Post by charliemk1 on Sun Jul 21, 2013 12:38 pm

What does that book say about the coil managing to fire 134 but not 2?

Is the plug wet in no 2 cylinder?

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Re: miss fire

Post by st1allstar on Mon Jul 22, 2013 5:55 am

cylinder 2 is wet but no spark, nothing wrong with plug or ht lead, i'm gonna try and get hold of a ignition coil and power module see if that sorts it, losing my patience with it a bit dont wanna have to break it
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Re: miss fire

Post by Louie on Tue Jul 23, 2013 11:38 am

robr33gts wrote:injectors ? is it sparking on all four now ?
All 4 injectors pulse at the same time on the ut.

Not sure on the coil - it's not like coil packs where there is an individual coil per plug.

Have you tried another spark ecu?
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Re: miss fire

Post by st1allstar on Fri Jul 26, 2013 10:08 pm

have tried that ignition coil and power module, still the same

had enough of it now
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Re: miss fire

Post by Louie on Fri Jul 26, 2013 11:31 pm

Get that spare spark ECU on it Mark.
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Re: miss fire

Post by st1allstar on Sat Jul 27, 2013 3:04 am

Turns out I don't have one, must have sold it
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Re: miss fire

Post by Mintys-turbo-mk1 on Sat Jul 27, 2013 4:57 am

^^ I have one that i don't need Mark.
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Re: miss fire

Post by charliemk1 on Sat Jul 27, 2013 7:07 am

I also have one that I would swap you for that spare coil/module you now have
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Re: miss fire

Post by st1allstar on Sat Jul 27, 2013 8:32 am

Nice one Charlie pm me your address and I'll get it posted to you
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Re: miss fire

Post by charliemk1 on Sun Jul 28, 2013 5:14 am

Pm sent but no reply Mark?
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Re: miss fire

Post by charliemk1 on Tue Jul 30, 2013 5:18 am

In the post
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Re: miss fire

Post by Tayto.king on Tue Aug 06, 2013 10:09 pm

Silly question time but is the distributor cap sitting properly on it's base, it might be riding high on no.2 if not sitting properly.
Also have you checked for play in the distributor shaft bearing by moving the shaft from side to side.

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Re: miss fire

Post by st1allstar on Tue Aug 06, 2013 10:57 pm

Cap is sitting correctly I have even changed the distributor for a spare one its still the same
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Re: miss fire

Post by Tayto.king on Tue Aug 06, 2013 11:37 pm

I can't see why the spark would just break down on no'2 alone and run well on 1,3 & 4 once power enters the distributor cap unless it's not making contact with no.2's terminal inside the cap. Especially as you've already changed the cap,rotor arm, ht lead and plug already.
I've had this with a distributor cap i bought from a motor factors on my gf's VW Polo, pattern parts don't fit that well as they're roughly made to fit as many cars as possible.

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Re: miss fire

Post by unot190bhp on Tue Aug 06, 2013 11:49 pm

get the multi meter out sounds like a bad wire
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Re: miss fire

Post by charliemk1 on Wed Aug 07, 2013 4:48 am

When the coil your sending me eventually turns up??. I'll check its working correctly
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Re: miss fire

Post by st1allstar on Wed Aug 07, 2013 4:49 am

It's in the post
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Re: miss fire

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