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Old 06 Dec 2017, 12:37 am
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KalebSikora KalebSikora is offline
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Join Date: Jan 2017
Posts: 64
Default Weird Fuel Problem

I made a post about this in the past, but the issue has only gotten stranger. One of the main suggestions to me is that perhaps I have a cracked exhaust manifold, but I don't think that can be it anymore.

To sum up my issue, my car was getting about 15 MPG with the CEL on with a lean engine (checked at AutoZone). My mechanic noticed that my valve cover gaskets were leaking oil and also leaked oil into the spark plug wells. He swapped the gaskets and resealed, while also cleaning out the spark plug wells.

The CEL turned off and for a few months my MPG returned to normal. The CEL came back on a few months later with the same MPG only to turn off again after a month returning my MPG to normal once again.

After several months the CEL never returned by my MPG started to plummet from 20 all the way down to 11. I just dealt with it for a while avoiding driving my car until my mechanic suggested using a engine cleaner. I ran some Techron through my car and it boosted the 11 MPG up to 21 MPG. It started to fall back down until I put a second Techron cleaner through.

It's been a few weeks since I put any in there and it's stayed around 16 MPG. Could it be the fuel filter? Or could it simply be something that is still lodged in there? This is getting very strange..
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