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Author Topic: Misfire or no misfire?  (Read 1749 times)

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Nickbat

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Misfire or no misfire?
« on: 27 November 2006, 22:42:20 »
I'm not at all happy with the way my car is running at the moment.

Tickover is OK, quite stable at around 500rpm. No error codes stored. New plugs fitted, but still not too good.

The problem is that it has lost it's normal sound. I know that sounds daft, but I hope you know what I mean. It seems to have adopted a more raspy deeper sound accompanied by a slight ticking from the top end on occasions. I've had a misfiring engine before (turned out to be the spark plugs) and I reckon at least 2 of the cylinders were not firing on that occasion. it was very noticeable. My question is, if a meggie starts running on 5 cylinders would it be that evident on tickover or only under load. Also, is there a non-invasive way (i.e avoiding pulling everything to bits in the pouring rain) to check whether I have a single cylinder misfire? There are lead testers on eBay for about £8.50 and I'm quite tempted.

Any thoughts?

 

  
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CaptainZok

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Re: Misfire or no misfire?
« Reply #1 on: 27 November 2006, 22:47:47 »
Get young Nicholas to write to TB'll fix it again. ;D
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Nickbat

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Re: Misfire or no misfire?
« Reply #2 on: 27 November 2006, 23:11:30 »
Quote
Get young Nicholas to write to TB'll fix it again. ;D

Can't de done Cap'n - he's out doing his course work (studying for a GNVQ in Street Crime).  ;D ;D ;D
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Nickbat

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Re: Misfire or no misfire?
« Reply #3 on: 28 November 2006, 23:00:59 »
Found a slight blowback on the plug nearest the passenger bulkhead. An extra quarter turn and the car seems to run better. At idle, I can even balance a pound coin on the plenum!! :y

Still a bit throaty on acceleration, but that may be due to the cheap back box I had fitted a short while ago. A curse of a million flies around the bum to anyone that says "I told you so!".  ;D ;D ;D
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Bo Bo

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Re: Misfire or no misfire?
« Reply #4 on: 28 November 2006, 23:07:31 »
I tlod yuo so!  :D
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Marks DTM Calib

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Re: Misfire or no misfire?
« Reply #5 on: 29 November 2006, 08:40:45 »
Quote
Found a slight blowback on the plug nearest the passenger bulkhead. An extra quarter turn and the car seems to run better. At idle, I can even balance a pound coin on the plenum!! :y

Still a bit throaty on acceleration, but that may be due to the cheap back box I had fitted a short while ago. A curse of a million flies around the bum to anyone that says "I told you so!".  ;D ;D ;D


Of course, you do use a torque wrench when you fit the plugs dont you...... ::)

Cheap back box......flys around bum....they do say that where there's sh!t there are flys.....
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Nickbat

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Re: Misfire or no misfire?
« Reply #6 on: 29 November 2006, 12:38:39 »
Quote
Quote
Found a slight blowback on the plug nearest the passenger bulkhead. An extra quarter turn and the car seems to run better. At idle, I can even balance a pound coin on the plenum!! :y

Still a bit throaty on acceleration, but that may be due to the cheap back box I had fitted a short while ago. A curse of a million flies around the bum to anyone that says "I told you so!".  ;D ;D ;D


Of course, you do use a torque wrench when you fit the plugs dont you...... ::)

Cheap back box......flys around bum....they do say that where there's sh!t there are flys.....


Wot's a torque wrench? :o :o

Seriously, though, I always thought you could put the plugs in tight with a socket (on a cold engine) and just give them an extra quarter turn to seal. Something I omitted to do on one of mine!

If you use a torque wrench, what Nm do you set it to?
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Re: Misfire or no misfire?
« Reply #7 on: 29 November 2006, 13:00:38 »
25Nm.
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Nickbat

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Re: Misfire or no misfire?
« Reply #8 on: 29 November 2006, 13:06:20 »
Thanks, AA.  :y
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The Barge Captain

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Re: Misfire or no misfire?
« Reply #9 on: 29 November 2006, 13:20:01 »
Changed my plugs yesterday - what a pig to get to #6  >:(
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