do i need new wires for these? like new connectors? or can i use the old ones?

I used the old wires mine were in good shape I put new plugs and coils in everything is running great

Did anyone see a noticeable increase in Mpg's after replacing these?.(compared do when you didn't have a misfire)

We did not check the miles per gallon when the 1 cylinder was not firing, we wanted t fix it. The dead cylinder will still have gas injected or drawn in, this gas will not add to the engine power, the 3 working cylinders will not move the car as well as 4. Since the gas is going through the engine without burning, it is not adding power, it is wasted., therefore the mpg is always lower with dead cylinders. There are 8 cylinder trucks designed to run on 6 or 4 cyl's when power demand is low, they are designed to shut of the fuel injectors at the specific cylinders.

Will this fit a 2008 Mercury mariner with a 2.3 Engine?

No they will not. Try these insteadMotorKingIC117 DG507 DG541 4M5G12A366BC 04-12

is this for one or all 4

All 4 heck of a deal these are 60 a piece at Autozone saved almost 200

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Ignition Coil FD505

Product ID: 24509325

Details

Brand
ENA
Connector Gender
male
Installation Type
Bolt-On
Item Weight
16 ounces
Vehicle Service Type
Car

⚡Consistent spark output

🔧Plug-and-play bolt-on install

🚗Fits 20+ Ford, Mazda, Mercury models

472 Lei

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Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Ignite your drive with confidence—never miss a spark!

DURABLE BUILD - Premium black coil packs built to withstand daily driving demands and extend engine life.
RELIABLE PERFORMANCE - Delivers consistent 12V ignition spark for smooth engine operation every time.
PEACE OF MIND WARRANTY - Backed by a 12-month warranty to keep your ride worry-free.
EFFORTLESS INSTALLATION - Plug-and-play design means no mechanic needed—bolt on and go!
WIDE VEHICLE COMPATIBILITY - Engineered to fit popular Ford, Mazda, Mercury, and Lincoln models from 2003-2021.

The ENA Set of 4 Ignition Coil Packs offers a direct replacement for multiple Ford, Mazda, Mercury, and Lincoln 2.0L to 2.5L DOHC engines. Featuring a plug-and-play bolt-on design, these 12V coil packs ensure reliable ignition and consistent spark output, enhancing engine performance and durability. Compatible with a broad range of models from 2003 to 2021, this set comes with a 12-month warranty for dependable, hassle-free upgrades.

Specifications

ASIN	B00NHFWGBQ
Automotive Fit Type	Vehicle Specific Fit
Best Sellers Rank	#50,027 in Automotive ( See Top 100 in Automotive ) #226 in Automotive Replacement Ignition Coil Packs
Brand	ENA
Brand Name	ENA
Compatible with Vehicle Type	Car
Connector Gender	male
Customer Reviews	4.4 out of 5 stars 1,313 Reviews
Installation Type	Bolt-On
Item Weight	16 ounces
Manufacturer	ENA
Manufacturer Part Number	ENAIC1115504
Model Number	C1453, DG507, DG541, C1658
Number of Items	4
Number of Packs	4
OEM Equivalent Part Number	C1453 DG507 DG541 4M5G-12A366-BC 4M5Z-12029-BC FD505 FD-505
Part Interchange Info	C1453 DG507 DG541 4M5G-12A366-BC 4M5Z-12029-BC FD505 FD-505
UPC	021515616159
Unit Count	4 Count
Vehicle Service Type	Car

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472 Lei

Duties & taxes included

In stock

Sold byAmazon RomaniaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Romania.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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