Cars firing on 3 cylinders!!!

[The Chubby Pirate]

This isnt good, i thought it was the exhaust but the engine management light came on...!

I think its a coil pack and/or spark plug! Anyone recommend anywhere ill get these 2 things cheap.

Phoned Euro Car parts the coil pack is £32 and the spark plugs are less that £3. Is this cheap????

 

[Marky_]

Could be HT leads as well. Cheaper than a coil pack.

 

[JackoR26]

http://www.partsgateway.co.uk/

 

[Martin_172]

ONLY use the genuine sparkplugs, they dont like anything else in my experiance, genuine ones are around £12 each though if i remember correctly

think its probably more likely to be the leads rather than the coil pack, ive never had a coil pack go on any 172 ive worked on but had to replace leads on 2!

not sure what the genuine leads cost, but magnecor are about £70 for the blue and just over £80 for the red i think

 

[The Chubby Pirate]

Could be HT leads as well. Cheaper than a coil pack.

How can i check if the HT leads are gubbed?

 

[x-172]

have you tried mopping down the plug holes,they're prone to getting damp/wet and running rough.

 

[The Chubby Pirate]

have you tried mopping down the plug holes,they're prone to getting damp/wet and running rough.

Im gonna get stuck into it tomorrow, what the exhaust tech guy said it could be a spark plug problem (the camblet and tensioners along with a service was done less than 3 months ago so the spark plugs seems non viable)

Surley if there was a problem with hos work it should have developed long before now!

 

[Steve2004]

My car decided to run on 3 cylinders once (spark plug died), was awful. A guy towing a caravan overtook me and I couldn't do anything to stop him!


Simple fix though, just swapped the spark plug for a new one and all was good again.

 

[JackoR26]

My car decided to run on 3 cylinders once (spark plug died), was awful. A guy towing a caravan overtook me and I couldn't do anything to stop him!

haha unlucky

 

[The Chubby Pirate]

My car decided to run on 3 cylinders once (spark plug died), was awful. A guy towing a caravan overtook me and I couldn't do anything to stop him!


Simple fix though, just swapped the spark plug for a new one and all was good again.

It might not be the spark plug (i hope to christ for the sake of sparing cash i dont have at the mo) it is...

How long were you driving the thing on 3 cylinders for? Suley the cat was flooding with fuel? lol

 

[alexbleubolt]

how many miles it done ? i would say that its the ht leads

 

[The Chubby Pirate]

47,800

Its been serviced 5 times, and its been running sweet as a nut since i took ownership 3 months ago?

 

[Steve2004]

My car decided to run on 3 cylinders once (spark plug died), was awful. A guy towing a caravan overtook me and I couldn't do anything to stop him!


Simple fix though, just swapped the spark plug for a new one and all was good again.

It might not be the spark plug (i hope to christ for the sake of sparing cash i dont have at the mo) it is...

How long were you driving the thing on 3 cylinders for? Suley the cat was flooding with fuel? lol

Ran on 3 cylinders for a few days and about 250 miles. :S

That was over 3 years ago now and the cat was (and still is) fine.

 

[The Chubby Pirate]

Right i see, ive parked her up just to be safe as if there was no such thing as bad luck id have no luck!

 

[vomboy 172]

i had this problem,

it ended up being the HT leads

When i run the engine and lifted the bonnet i could here sparking, and further investigation i could see a spark from the middle of my HT lead to plenum. What had happened was, the HT lead had been rubbing under the plenum and worn through one of the leads, so i taped it up with electrical insulation tape and replaced them with some magnecor leads.

It might be worth taking your plenum off and check all your leads for signs of rubbing.

Good luck

 

[The Chubby Pirate]

How much am i lookin at for HT leads?

 

[vomboy 172]

http://www.k-tecracing.com/show_product.asp?id=846

thats what i fitted, 8mm blue

They fit perfect and come with protective bits for areas where they may rub against the engine

 

[sideways danny]

leads are a shade under £100 for a set from renault. Non genuine leads can be annoyingly too short

 

[The Chubby Pirate]

mmmm thats expensive, still i dont compromise when it comes to my car im very picky on things like this, if one spark plug fails id change them all same goes for the leads!

 

[sideways danny]

I'd change the plugs anyway TBH, they wont have been done (and aren't due to be by renault service intervals) but they're not expensive and you have to do most of the work to change them if you change the leads

 

[The Chubby Pirate]

I'd change the plugs anyway TBH, they wont have been done (and aren't due to be by renault service intervals) but they're not expensive and you have to do most of the work to change them if you change the leads

The plugs were changed 3 months ago, bosch reckon the plugs should technically last upto 30k miles (although not recommended, they would last)