MGA 1600: Runs Bad Over 2500 RPM — Let’s Find Out Why

Welcome back to Union Jack Classics! Today we have a 1959 MGA 1600 in the shop — it just won’t run right above 2500 RPM. We’ll start with a quick test drive to see exactly what’s happening, then take you step-by-step through our diagnostic process. While we suspect it may be ignition-related, we’re not skipping any basics — from compression testing and valve adjustment to checking timing and examining the SU carburetors, we’ll make sure every system is doing its job. This is a great look at how to logically diagnose running issues on classic British cars — whether you’re working on an MGA, MGB, or anything with SU carbs and Lucas ignition, the same approach applies. 🔧 In This Video: • Real-world diagnostic process for classic British engines • How to isolate ignition vs. fuel problems • Tips for better compression and timing checks • Why “starting with the basics” still matters most If you love real shop diagnostics and classic British troubleshooting, you’ll want to see this one through to the end — the cause might surprise you! ** DISCLAIMER ** As an Amazon Associate, I earn commissions from qualifying purchases Valvoline VR1 20w50 5qt jug https://amzn.to/3XbgZlu 6qt case. https://amzn.to/4dLu77V Castrol GTX Classic 20w50 6 qt case. https://amzn.to/3AMgl6B 5 qt jug. https://amzn.to/3MqGEBZ Driven HR-1 20w50 6 qt case. https://amzn.to/4g5STRT 12 qt case. https://amzn.to/3Xp2g80 Cherry Bomb Hand Cleaner 48 oz bottle https://amzn.to/4dEdNa3