Fort Smith, AR
Independent shop
GM AFM/DOD specialist
Dr. Underhood Automotive
Advanced Diagnostics · Programming · Electrical Repair · Performance Tuning
Independent repair shop in Fort Smith, Arkansas. ASE Master-level diagnostics. Two decades on a wrench. The work other shops give up on — electrical gremlins, AFM lifter failures, custom HP Tuners tunes, programming, deep drivability — that's what we do.
Call (479) 434-5852 Try Live Assist — $20 AI diagSpecialty pages
Shop Info
Specialty Services
AFM / DOD Lifter Deletion (Preventive)
If you own a 2007+ GM truck or SUV with a 5.3L or 6.2L V8 — Silverado, Sierra, Tahoe, Yukon, Suburban, Escalade — Active Fuel Management is a ticking clock. We tune out and/or delete the AFM/DOD system before a lifter collapses and takes the cam with it. Done right, this saves a $7,000+ repair.
LS / LT Camshaft Swap with VLOM Cleanup
Already heard the tick? We do the full cam-swap repair: pull the lifters, replace the cam, replace the VLOM (valve lifter oil manifold) tray and bolts, clean every passage, and lock out AFM in tune so it can never come back. Out-the-door pricing, parts shown up front.
Custom HP Tuners Tuning
Cam tunes, AFM/DOD disable, MAF/VE table corrections, idle/drivability cleanup, mild performance tunes. We tune what we install — no mail-order surprises.
General Diagnostics & Repair
Check engine lights, drivability issues, brakes, suspension, scheduled maintenance, electrical gremlins. All makes, all models.
Live Assist — $20 Remote Video Diagnosis
Not local? Use our consumer app — Put The Car On The Phone — to get a live video diagnostic with a real mechanic, AI-assisted, for $20 flat. Written report when we're done.
Why Specialists Matter on AFM
The AFM/DOD lifter failure on the GM Gen IV / Gen V V8 is one of the most-Googled engine problems in America. Most chain shops either don't know how to tune it out cleanly, or they just throw a cam at it without addressing the VLOM and oil-passage contamination — which puts the customer right back where they started in 30,000 miles. We've done this job enough times to fix it once and for good.