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The intake cam lobes were significantly worn, and the reason for the driveability concern. Under higher rpm, the cylinders of bank #1 starved for air and created the misfire. This caused the P0300 to be stored.
This 2019 Dodge Durango was showing DTC P0300 and misfires being flagged for cylinder No. 1 — but the PCM only registered misfires above 3,000 rpm.
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Photo by author
With the expander installed, next install the lower oil scraper ring. This will secure the expander ring, keeping the expander ends butted together. Next install the upper scraper ring. This completes the oil ring package. Be sure to orient the clock positions of the upper and lower scrapers to keep their end gaps far away from each other (90 degrees apart, 180 degrees apart, or whatever orientation specs recommend.

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Videos

PACKOUT Rack Kit | 48-21-8070 | Assembly and Installation - Wood Wall
In this video, Milwaukee Tool PACKOUT Rack Kit.
Oct. 16, 2025
Toolbox Topics: Snap-on
In this video, PTEN Editor-in-Chief Nadine Battah speaks with Jeff Weiss, Senior Product Manager for Power Tools at Snap-on, about the evolution of cordless ratchets in today&...
Oct. 15, 2025
Service Done Right: Hybrid Prius Won’t Start? Tricky Fix Diagnosed Fast with Repair Information
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Nate Fink diagnoses hybrid battery issue with the ProDemand repair information suite
Oct. 15, 2025
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Five new tools added to Vehicle Service Pros!
Oct. 14, 2025

Podcasts

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ACA's Mark Bodgansky reveals game-changing floor segmentation, buyer engagement strategies, and how to maximize your ROI at this year's show.
Oct. 16, 2025
aftermarket_allaccess_larsen
Learn why ACES and PIES standards are transforming global automotive aftermarket communication and why it matters to aftermarket success.
Oct. 2, 2025
endeavor_to_discover2ambw
In this episode, Mike Jones tells listeners what it takes to be a person who follows up and follows through on commitments in a business setting.
Sept. 4, 2025
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For anyone who has ever uttered the words, "failure isn't an option," Mike Jones, president and master trainer at Discover Leadership Training, has a message you should consider...
Aug. 7, 2025

Parts Distributor

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Following Patrick James' departure, First Brands Group is prioritizing stability and transparency, with interim CEO Charles Moore overseeing efforts to investigate past financing...
Oct. 17, 2025
uschamberofcommercelogovector
The White House is set to announce a five-year extension of tariffs relief for the US automotive sector, allowing automakers to reduce costs on imported car parts and bolster ...
Oct. 17, 2025
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The Buzzard family has been honored with the Gold Lifetime Trustee designation by the University of the Aftermarket Foundation, recognizing their decades-long support and leadership...
Oct. 17, 2025
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Government argues that the president has broad emergency powers to impose sweeping levies on trading partners.
Oct. 16, 2025

Tool Distributor

E. Markham
Attendees visiting the Ko-ken booth.
Neu Tool’s 2025 tool fair was held at their new Waukesha, Wisconsin warehouse from September 26-27.
Oct. 8, 2025
Tracy Bourdon truck
Timely updates and reliability can enhance your reputation as a dealer, ensuring customers feel valued and confident in your service.
Oct. 8, 2025
Rowaan's customer base in Niagara includes technicians working with heavy duty and agricultural equipment.
Moving into a new truck can be a slow and frustrating process, but it’s the perfect time to reevaluate your business and make sure you’re on the right track.
Oct. 6, 2025
Photo courtesy of Chuck Trombold
The team and their spouses all rocking t-shirts with Chuck's face printed on them.
This distributor took over his brother-in-law’s route, and plans to pass it on to his sons once he retires.
Oct. 3, 2025

Product Guide

Photo courtesy of Bendpak
Bendpak RWS-200WL Rechargeable Portable Wheel Lift
The BendPak RWS-200WL Battery-Powered Wheel Lift eliminates the physical strain of wheel service, protecting technicians while delivering greater uptime. Unlike air-powered models...
Oct. 14, 2025
XTool HDGURU
The XTool HDGURU offers heavy duty vehicle diagnostics via standard OBD-II protocols, with over 60 bi-directional tests, more than 35 Cummins dedicated functions, and advanced...
Oct. 10, 2025
1/4' Drive 3' Locking Extension, No. 43-24-9300
The Milwaukee Tool 1/4" Drive 3" Locking Extension, No. 43-24-9300, offers control and security in tight applications. The extension features the largest knurling surface on the...
Oct. 10, 2025
ArtiDiag800
The TOPDON ArtiDiag800 features full system diagnostics for 54 vehicle makes and offers 28 service functions for domestic, European, and Asian vehicles newer than 1995. The ArtiDiag800...
Oct. 8, 2025

Service Repair

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Three flexible paths to earn and maintain your ASE credentials.
Oct. 15, 2025
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A new way for automotive instructors to connect with local shops.
Oct. 15, 2025
donnell
Jonathan Donnell on the challenges of repair complexity and why keeping the spark alive for young techs matters.
Oct. 15, 2025
Photo courtesy of TechForce Foundation
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A student at the NASCAR Technical Institute, Haiden McMurray wants to become a go-to problem solver.
Oct. 13, 2025

Industry News

RLink
The RLink J2534 is compatible with OE software across more than a dozen brands and provides OEM-level diagnostics and programming.
Oct. 15, 2025
aspire_images_50
The PPG MIX'N'SHAKE is designed to eliminate the need to manually stir in the automotive refinish industry.
Oct. 14, 2025
Sonic Tools scholarship
The Sonic Impact Scholarship Program aims to support aspiring technicians by providing them with premium tools stored in Sonic Foam Systems and toolboxes, emphasizing the importance...
Oct. 14, 2025
aspire_images_49
This new product line is designed to support both 6V and 12V units.
Oct. 13, 2025

Technical Service Bulletins

Photo courtesy of Ford
To correct the condition, follow the service manual procedure to address water intrusion and reprogram the CHCM using the latest software version of the FDRS scan tool.
Some 2021-2023 Ford Bronco vehicles equipped with a factory front stabilizer bar disconnect may encounter a Sta-bar Disconnect Service Required message in the IPC and an illuminated...
Oct. 17, 2025
Photo courtesy of General Motors
Replace the RDM lubricant with Dexron LS 75W90 (P/N 9986290). Bring the new lube up to operating temperature. Perform multiple figure eight or lock-steer maneuvers to work the lubricant into the clutch pack.
This bulletin applies to 2020-2023 Buick Encore GX vehicles equipped with an L3T engine and M3F transmission.
Oct. 17, 2025
Photo courtesy of Jeep
The rear defroster electrical connector is a one-time use design. If it comes loose or is removed for any reason, it must be replaced.
This bulletin applies to 2018-2022 Jeep Wrangler vehicles equipped with rear window defrost.
Oct. 17, 2025
Photo courtesy of Lincoln
Reprogram the PCM to the latest calibration using IDS release 107.01 or higher.
Some 2017-2018 Lincoln MKC vehicles equipped with a 2.0L gasoline turbocharged direct injection (GTDI) engine and built on or before Sept.18, 2017, may exhibit a MIL on with DTC...
Oct. 17, 2025

Learning Resources

ID 267167152 © Andrew Angelov | Dreamstime.com
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Sponsored
Discover how your shop can take control of OEM-level repairs with Autel’s J2534 solutions—whether you’re ready to program in-house or prefer certified remote support, this session...
Oct. 16, 2025
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Sponsored
Engine Management diagnostics can be a complicated process, even for the most experienced technicians. Often, parts are replaced unnecessarily, or the root cause of the drivability...
Aug. 21, 2025
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Sponsored
Discover how Autel’s revolutionary 2-in-1 IA900 and IA1000 systems are transforming alignment and ADAS calibration into a single, streamlined, revenue-boosting solution for modern...
Oct. 1, 2025
ma6823azac_servicetoptips_thumbnail_cropped
Sponsored
When performing automotive HVAC service, it’s essential to consider all the system components, both inside and outside the vehicle’s cabin. This includes the refrigerant...
Aug. 7, 2025