Fuel odor on cold starts

[Angler3]

I have a 2020 JT and I’m noticing on cold starts and occasionally it smells like fuel . Anyone else experiencing this ? It’s almost as if it’s burning rich
thanks for any info

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[Hootbro]

You might have a fuel injector that is slightly sticking once it cools down. On a cold start, there is like a 30 second high idle for emissions to bring the engine up to temp quicker and the injector(s) may not be closing all the way at first.

If you have a scan tool that can monitor misfires, you can check that on startup to possibly get direct which cylinder injectors may be trouble. ECM will store small misfires events without posting a CEL. The more technical way and beyond most vehicle owners is to check with a o-scope the injector electrical amp pull waveforms that will show a sticking injector. '

I would run a concentrated fuel cleaner like Techron for a couple of tank fills before getting too wrapped up in other troubleshooting.

 

[Angler3]

You might have a fuel injector that is slightly sticking once it cools down. On a cold start, there is like a 30 second high idle for emissions to bring the engine up to temp quicker and the injector(s) may not be closing all the way at first.

If you have a scan tool that can monitor misfires, you can check that on startup to possibly get direct which cylinder injectors may be trouble. ECM will store small misfires events without posting a CEL. The more technical way and beyond most vehicle owners is to check with a o-scope the injector electrical amp pull waveforms that will show a sticking injector. '

I would run a concentrated fuel cleaner like Techron for a couple of tank fills before getting too wrapped up in other troubleshooting.

thanks, I’ll try the cleaner

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