‘05 enthusiast, I’m having an issue with a horrific ammonia smell when I hammer the throttle. It runs and drives fine, no CEL. Regular driving is fine, it’s only on heavy acceleration..passing someone or taking off quick. I only run 91 octane. It just smells like pure ammonia. Anyone else run into anything like this?

 

Not sure about an ammonia smell, but if your catalytic converters are failing or on their way out, it will smell more like sulfur (rotten eggs). Are you running stock cats, HFCs, or TPs?

You mentioned 91 octane, but are you getting it from a reputable source or a budget gas station? Not all gasoline is created equal despite a similar octane rating.

 

Definitely like an ammonia smell or very similar. I know the sulpher smell that generates from faulty CATS and that’s what I don’t understand lol. This is a very strong odor that occurs only on hard acceleration. I get gas from a widely known chain of stores but only in my state I guess?? Hell idk…I know they’re on every corner and millions of folks buy fuel from them. I just don’t get what it could even be haha