I've recently replaced the EGR valve, EGR sensor, and EGR regulator on my Ford F-15 T-150 with a 4.6L engine, but the vehicle still runs roughly and I'm consistently receiving the 'Excessive EGR Flow' diagnostic trouble code (DTC). Despite these replacements, the issue persists. What other components or systems should I inspect to resolve this? Any guidance would be greatly appreciated. Terry
Jeff, what's the best method to clean the throttle body? My owner's manual advises against using chemical cleaners because the throttle body is coated with anti-sludge material. Can you confirm this?
I remove the throttle body and use soapy water with an old toothbrush to clean it. Chemical cleaners can be used in moderation, but avoid excessive application — the main concern is potential damage to internal sensors or circuits. To stay safe, visit your Ford dealer's parts department and pick up the cleaner they typically use. Also, inspect the ports behind the throttle body that feed into the DPFE sensor, as blockages here may contribute to EGR flow issues.
I cleaned both the throttle body and all associated ports — the improvement in engine performance was dramatic. I'm now considering replacing the spark plugs on my 4.6L engine, but I've heard horror stories about them breaking off or causing damage, especially in newer engines. I spoke with a local Ford dealer, who said the 4.6L engine doesn't have known plug-related issues. Should I trust this information?
If you decide to attempt spark plug replacement yourself, visit your dealer to purchase the correct plugs and request a copy of the TSB (Technical Service Bulletin) outlining the proper procedure for removing plugs on Ford Triton/4.6L engines. If there's any risk of breakage, it’s safer to let professionals handle this task. Breaking one plug could result in significant costs due to specialized tools needed to remove and replace a broken component.
Thanks for the advice! I appreciate your input — I’ll skip doing it myself and instead trust the experts to perform this work. It’s always better to ensure safety and avoid costly repairs.
Check the DPFE sensor and clean the throttle body — this is a common fix that has been discussed frequently on forums for Ford F-150 4.6L engines.