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Old 2 Weeks Ago   #46
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Re: 100hp mpg drop?

Quote Originally Posted by dac69er View Post
i am kinda suspecting a coil/coils. my only issue is that it drives really well, its simply the fuel consumption that seems off!

it is quite pricey to replace all 4 coils on a whim which is why i am a little reluctant to do it!

i know what you mean about the harness, it turns to dust once the mileage is up and the heat has got to it

from memory, i think the connectors are pretty straight forward to remove once you know the "knack" i would have to have a look and refresh my memory on that though!

did you get an engine warning light when one of the coils went? what mileage is your car currently?

it will be interesting to see what your fuel consumption is like now the coil is replaced. you did mention that yours was pretty crappy too
You could try one replacement and try it each cyclider/plug for a week see time see if it improves the mpg any?
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Old 2 Weeks Ago   #47
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Re: 100hp mpg drop?

That's assuming it's only 1 coil at fault of course.

I guess I could try that. I'm still not sure how cost effective that is. Even the cheapest coils on eBay at around 20+ the relatively small reduction in mpg would take a while for me to recoup the expense if it does improve it.
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Old 1 Week Ago   #48
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Re: 100hp mpg drop?

The performance and mpg have improved on mine with it's new stick coil. But doing mostly motorways and duals, it's unlikely to get above 40mpg.


It cost 43 from my friendly local parts shop so I'm hoping its the only one. On Shop4Parts they cost 45 plus VAT and delivery so very not cheap.

A basic test of failing coils means swapping them about and see if the cool exhaust stub "moves".
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Last edited by DaveMcT; 1 Week Ago at 10:45.
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Old 1 Week Ago   #49
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Re: 100hp mpg drop?

Quote Originally Posted by DaveMcT View Post
The performance and mpg have improved on mine with it's new stick coil. But doing mostly motorways and duals, it's unlikely to get above 40mpg.


It cost 43 from my friendly local parts shop so I'm hoping its the only one. On Shop4Parts they cost 45 plus VAT and delivery so very not cheap.

A basic test of failing coils means swapping them about and see if the cool exhaust stub "moves".

i have found some substatially cheaper coils from some dubious sources, but these may be trash anyway!
im tempted to give them a try though


i cant see a coil that is only weak and not actually causing a misfire creating a noticeable decrease in the temp of one exhaust outlet port on the manifold without use of temperature probes in the runners.
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Old 1 Week Ago   #50
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Re: 100hp mpg drop?

Quote Originally Posted by dac69er View Post
i have found some substatially cheaper coils from some dubious sources, but these may be trash anyway!
im tempted to give them a try though


i cant see a coil that is only weak and not actually causing a misfire creating a noticeable decrease in the temp of one exhaust outlet port on the manifold without use of temperature probes in the runners.
If you fully warm the engine the only way to get any information from the exhaust temperature would be via an IR thermometer. I used that method to set the throttle bodies on my bike.

My quick and dirty coil test runs the cold engine for less than 10 seconds. Enough to warm the exhaust runners. Any that feel cool are suspect. Swapping the coils around is long enough for the metal to cool back to ambient for a retest.

A cold engine tends to show weak coils more than a warm engine.
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Old 6 Days Ago   #51
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Re: 100hp mpg drop?

well i managed to find some coils for 6.99 each

i have bought a full set so lets see how they go when they turn up.........
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Old 6 Days Ago   #52
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Re: 100hp mpg drop?

Quote Originally Posted by dac69er View Post
well i managed to find some coils for 6.99 each

i have bought a full set so lets see how they go when they turn up.........
Wow!

That's little more than I paid for just one coil.
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Old 6 Days Ago   #53
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Re: 100hp mpg drop?

Quote Originally Posted by DaveMcT View Post
Wow!

That's little more than I paid for just one coil.
May be false economy, but worth a try for fault finding sake.

I will take one for the team and share details if they are any good. They look good quality in the pictures!
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Old 13 Hours Ago   #54
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Re: 100hp mpg drop?

Well they work. Maybe a bit more pull at low rpm, but that may just be in my head.

They seem decent enough. Just need to test them long term.

Originals on the left, new ones on the right:
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Last edited by dac69er; 13 Hours Ago at 19:26.
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