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That annoying jerk or shudder you feel when accelerating uphill, especially in a Ford F-150 Ecoboost or a Ram 5.7 Hemi, is often not a dying coil pack — it is a worn-out boot. The rubber boot that sits between the ignition coil and the spark plug cracks with heat over time, letting moisture and spark energy escape. Swapping just the boot instead of the whole coil pack saves serious cash, but you need one that fits tight and resists that engine heat. This guide cuts through the part numbers and compatibility lists to find the best coil on plug boot for your truck or car.
I’m Min Islam — the founder and writer behind Trending Car. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Whether you drive a Ford, Chevy, Ram, or Toyota, the right coil on plug boot restores lost power and smooths out that rough idle for around the price of a tank of gas.
Quick Picks
- Denso 671-8163 Coil-on Plug Boot, Black — Full Engine Set
- Denso 671-8164 Coil Over Plug Boot, Black — Ford Truck Specialist
- Motorcraft WR6135 Ignition Spark Plug Boot — Ecoboost Fix
- Partuto Engine Ignition Coil Boot Kit — F-150 Bulk Value
- uxcell 4 Set Engine Ignition Coil Boot Kit — Chevy Cruze Kit
How To Choose The Best Coil On Plug Boot
A coil on plug boot is a simple rubber part, but the wrong one will leave you chasing a misfire you already fixed. Focus on fitment, build quality, and what comes in the box.
Start With Your Engine’s OE Part Number
Your vehicle’s ignition system uses a specific boot length, a particular spring type (straight or tapered), and a connector shape that matches your coil pack. Look up the original equipment (OE) part number for your engine — for example, the 7T4Z12029DA for a Ford F-150 3.5L Ecoboost or the 1208092 for a Chevy Cruze 1.4L. A kit listing those exact numbers is the safest bet for a perfect seal.
Rubber Quality and Included Grease
The boot material takes the full brunt of engine heat cycles. A good boot uses a firm silicone rubber that does not soften or crack after a few months. Most premium kits also include a small packet of dielectric grease — this non-conductive paste lubricates the inside of the boot so it slides off the spark plug easily during your next replacement, preventing the boot from tearing.
Count and Cost Per Boot
Some engines need six boots, some need eight or sixteen. A 4-pack or 6-pack usually gives you better value than buying single boots at the parts counter. Calculate the cost per boot; spending a few dollars more for a Denso or Motorcraft set that fits exactly is cheaper than buying a generic set twice.
Quick Comparison
| Model | Best For | Fitment | Quantity | Weight | Amazon |
|---|---|---|---|---|---|
| Denso 671-8163 | Full Engine Set | 5.7L Hemi, 5.4L Ford | 16 (by count) | 1.69 pounds | Amazon |
| Denso 671-8164 | Ford Truck V8 | 2004-05 F-150 5.4L | 8-pack | 16 ounces | Amazon |
| Motorcraft WR6135 | Single OEM Swap | 2016 F-150 3.5L Ecoboost | Single | 0.03 Pounds | Amazon |
| Partuto 7T4Z12029DA | F-150 Full Set | Ford F-150 2011-2016 | 6 Set | 5.6 ounces | Amazon |
| uxcell 4 Set | Chevy Cruze | Chevrolet Cruze 2011-2015 | 4 Set | 2.39 ounces | Amazon |
In‑Depth Reviews
1. Denso 671-8163 Coil-on Plug Boot, Black
The dense box that covers all 16 boots on a 5.7L Hemi at a fraction of dealer cost.
If you drive a Ram 1500 with the 5.7 Hemi or a Ford with a 5.4L V8, you need eight boots for a full swap — the Denso 671-8163 gives you enough to do a 16-boot engine twice over, covering V8s entirely. At 1.69 pounds, it is heavier than the single Motorcraft boot (1.69 pounds vs 0.03 pounds), but that weight means you are getting a full set of dense silicone boots plus a packet of dielectric grease (a non-conductive silicone lubricant that stops the rubber from sticking to the spark plug). Buyers report it is identical to the originals and likely the OEM supplier, with one owner sharing that the dealer wanted per coil pack — this kit fixes the boots instead.
Unlike the Partuto kit below that fits only 2011-2016 F-150s, this Denso works across multiple engine families including the 2011 Durango 5.7 and 2015 Ram 1500. Owners mention the boots include dielectric grease in the box, which keeps the rubber from bonding to the spark plug on hot engines. The catch is you may need to buy additional dielectric grease if you are doing all 16 at once, since the included packet is small.
One owner on a 2015 Ram 1500 5.7 Hemi put 100 miles on them and reported the truck is running smoother with no issues so far. Compare that to the uxcell kit below, which is limited to the Chevy Cruze — this Denso covers a far wider range of American V8s.
Why It Leads
- Covers 16 boots — enough for two V8 banks or a full Hemi swap
- Includes dielectric grease for easier future removal
- Customers note it is identical to OEM and likely the supplier for Ford/Dodge
One Trade-Off
- Small grease packet may not be enough for all 16 boots — buy a tube separately
Reach for this if: you own a Ram 5.7 Hemi or Ford V8 and want a full engine set in one purchase.
One Caveat: verify your engine uses the center-position boot design before buying — check the 671-8163 fitment list first.
2. Denso 671-8164 Coil Over Plug Boot, Black
The go-to eight-pack for a 5.4L Ford that brings the overdrive shudder to a stop.
Owners of 2004-2005 F-150s with the 5.4L Triton know the famous overdrive (O/D) shudder — a vibration that kicks in around 45 mph when the transmission hunts. Denso 671-8164 tackles that shudder at the ignition source. At 16 ounces, it is heavier than the uxcell kit (16 ounces vs 2.39 ounces), and that weight comes from a thicker rubber construction built for the high heat of a Ford V8 engine bay. Reviewers point out these boots work great on Accel coil packs and come with a packet of dielectric grease, just like the pricier 671-8163 set above.
One reviewer noted that the original coils rarely go bad but the boots do, calling this a cheap way of renewing the coils and restoring smooth operation. Unlike the Motorcraft single boot that covers only one cylinder, this Denso 8-pack handles an entire V8 bank or a full V6 engine. The included grease is a nice touch — coat the inside of each boot so the next plug change does not rip the rubber.
Reviewers also report these fit just like the originals from Ford, with one owner suggesting Denso may have been the OE supplier. If you need more boots, the 671-8163 above covers 16 for larger engines, but the 671-8164 is the perfect middle ground for a standard V8 set.
Best For The 5.4L Triton: buyers targeting the O/D shudder on 2004-2005 F-150s get a direct fix without overspending on a 16-pack.
Grab this if: you drive a 5.4L Ford and want a matched set of eight quality boots with grease included.
skip it if: your engine uses a different boot length or connector — double-check the 671-8164 fitment for your specific year.
3. Motorcraft WR6135 Ignition Spark Plug Boot
The genuine Ford boot for a 3.5L Ecoboost that weighs practically nothing — 0.03 pounds.
At 0.03 pounds, the Motorcraft WR6135 is the lightest boot in this lineup — lighter than the Denso 671-8163 set (0.03 pounds vs 1.69 pounds) — because it is a single replacement, not a bulk kit. This is the exact same part the dealership uses, with a Ford Limited Warranty behind it. Shoppers say a perfect fit for the 2016 F-150 3.5L Ecoboost, with one owner specifically noting it fixed a shuddering issue on that engine. If you only need one or two boots after a plug change tore the originals, this is the safest route.
Unlike the Partuto kit below that sells six boots for the same engine family, the Motorcraft is a single boot. That makes it ideal for a quick warranty repair or a single-cylinder misfire, but pricier per boot than a bulk set. One reviewer even called it a perfect fit and replacement for the 2016 3.5 Ecoboost, and another confirmed it is not a counterfeit but a genuine Ford part.
Reviewers recommend using dielectric grease on the boot to ease future coil removal — the same advice you will hear for every boot here. If you need a full set of six for the Ecoboost, the Partuto kit below gives you better value; keep the Motorcraft for a single emergency swap.
What Makes It Reliable
- Genuine Motorcraft part with Ford Limited Warranty — no fitment guesswork
- Lightest option at 0.03 pounds for one boot
- Buyers confirm it is a direct replacement for 2016 3.5L Ecoboost
The Limitation
- Single boot only — expensive per boot compared to bulk kits
Choose this when: you need an exact OEM replacement for one cylinder and want the Ford warranty.
Pick the Partuto instead if: you are doing all six boots on the Ecoboost and want a better price per boot.
4. Partuto Engine Ignition Coil Boot Kit 7T4Z12029DA — 6 Set
The six-pack that fixes the 3.5L Ecoboost uphill shudder for half the price of a single coil.
If you own a 2011-2016 Ford F-150 with the 3.5L V6 Ecoboost, the Partuto kit with OE numbers 7T4Z12029DA and 7T4E12A375EE is a direct fit for all six cylinders. At 5.6 ounces and with package dimensions of 6 x 4 x 1.6 inches (uxcell kit below: 4.25 x 2.87 x 1.81 inches), this kit gives you enough rubber to refresh the entire engine. Buyers report it fixed a shuddering issue in a 3.5L V6 Ecoboost F150 that was stumbling uphill, a problem that plugs alone did not fully solve.
One buyer mentioned the kit saved a ton of money compared to buying six brand new coils, calling the build quality identical to the original Ford boots. The installation is tool-free — just pop off the old boots and push these on. However, one buyer did report a missing spring in the packaging, with springs left loose instead of bagged, so inspect the contents before you start the job.
The Partuto kit is a strong alternative to the Motorcraft single boot if you are refreshing all six cylinders at once. Compare the value: one Motorcraft boot versus six Partuto boots — the bulk kit wins on cost per boot for a full engine service.
Smart Ecoboost Refresh: a full six-boot set for under that owners mention matches the original Ford quality and fixes the uphill shudder.
Buy this if: you have a 2011-2016 F-150 Ecoboost and want to replace all six boots in one go.
Watch for: open the package carefully — a few buyers reported loose springs that may need to be secured.
5. uxcell 4 Set Engine Ignition Coil Boot Kit No.1208092/1208096/19005362
A four-pack for the 1.4L Cruze that costs less than what the local parts store charges for one.
The uxcell kit targets the Chevrolet Cruze 2011-2015 with the 1.4L turbo engine, using OE numbers 1208092, 1208096, and 19005362. At 2.39 ounces and with small package dimensions of 4.25 x 2.87 x 1.81 inches, this is the most compact kit in the lineup — designed specifically for the Cruze’s tight engine bay. Customers note it is less expensive than the local stores and fits perfectly on a 2014 Chevy Cruze 1.4L with close to 300k miles on it, helping restore engine performance.
The kit uses plastic and metal materials — the plastic body resists scratching the ignition coil bore, and the metal spring core maintains consistent spark contact. One reviewer even noted that despite the listing saying it does not fit the 2013 Chevy Sonic LT turbo, it actually does. If you own a 2011-2015 Cruze and need a full set of four, this is the budget-friendly answer. It is not as heavy as the Denso 671-8163 (2.39 ounces vs 1.69 pounds), but it does not need to be — the Cruze’s 4-cylinder engine only requires four boots.
The main limitation is vehicle-specific fitment: this kit will not work on a Ford or Ram. Stick with the Denso or Partuto kits for those engines. For Cruze owners, the uxcell kit is a direct, inexpensive fix that buyers confirm works on 2011, 2013, and 2014 models.
Why It Fits The Cruze
- Exact OE numbers for Chevrolet Cruze 2011-2015 1.4L
- Buyers confirm it is cheaper than local auto parts stores
- Works on 2011, 2013, 2014 Cruze and even 2013 Sonic LT turbo
The Limitation
- Only fits the Cruze (and Sonic) — not compatible with Ford or Ram engines
Reach for this if: you own a 2011-2015 Chevy Cruze 1.4L and want a full four-boot set that saves money over the parts counter.
Look elsewhere if: you drive a Ford, Ram, or any non-GM vehicle — the fitment is strictly for the Cruze family.
Understanding the Specs
OE Part Number Cross-Reference
The OE (Original Equipment) number, like 7T4Z12029DA for Ford or 1208092 for Chevy, is the single most reliable way to ensure you get the correct boot length, spring taper, and connector shape. Aftermarket kits that list the exact OE numbers in the title are pre-verified for that engine family. Ignoring the OE number is the fastest way to install a boot that does not seal against the spark plug, causing a misfire that feels exactly like the old problem.
Dielectric Grease
Dielectric grease is a silicone-based lubricant that does not conduct electricity. You apply a thin coat inside the boot before pushing it onto the spark plug. This prevents the rubber from bonding to the porcelain after thousands of heat cycles. Without it, the boot often tears when you pull it off for the next plug change, forcing you to buy a replacement boot earlier than expected. Every serious kit in this guide either includes a packet or reviewers recommend you buy one separately.
FAQ
What does a coil on plug boot do?
When should I replace the boot instead of the whole coil pack?
How do I know which boot fits my engine?
Can a bad boot cause a check engine light?
Do I need dielectric grease for a coil boot?
How many boots do I need for a V8 engine?
Will a coil boot fix a shudder in my F-150 Ecoboost?
Are aftermarket coil boots as good as OEM?
Final Thoughts: The Verdict
Across the board, the coil on plug boot winner is the Denso 671-8163 because it covers 16 boots for large V8 engines like the Ram 5.7 Hemi and Ford 5.4L, includes dielectric grease, and matches OEM quality at a fraction of dealer prices. If you drive a Ford F-150 3.5L Ecoboost and want a full six-boot set, grab the Partuto 7T4Z12029DA kit. And for a single OEM replacement on a 2016 Ecoboost, the Motorcraft WR6135 is the exact factory part you need.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of July 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
As an Amazon Associate, Trending Car earns from qualifying purchases. This does not affect which products we feature.