Finally got my old truck to pass emissions after three months of work

Started on this project back in April. The '98 F-150 failed the test hard. Hydrocarbons were way over the limit. Figured it was just the O2 sensor. Replaced that. Still failed. My buddy Mike said to check the EGR valve. That was stuck shut. Cleaned it out. Failed again. Finally found a cracked vacuum line behind the intake manifold. A tiny one. Cost about $7 for the hose. Took it back to the testing center in Mesa last Tuesday. The guy just gave me a thumbs up and the printout. Felt like a real win after all that. Anyone else have a simple fix that took forever to find?

2 comments

2 Comments

victor_carter515d ago

Man, those vacuum leaks are the worst... you can chase your tail for weeks. Had a similar thing on an old Jeep where it was just a dry-rotted PCV hose elbow. Engine ran rough at idle for months. Spent money on plugs, wires, even a fuel filter. The fix was a two-dollar piece of rubber from the parts store. Felt like a genius and an idiot at the same time.

wood.zara4d ago

It's that weird mix of relief and shame when you finally find it. What gets me is how the car almost trains you to ignore the small problem. You adjust your driving, you turn the radio up, you make excuses for the rough idle. Then you fix it and the engine is so smooth you can't believe you put up with the noise for so long. It's like the machine was whispering the answer the whole time.