Should run a bit better for ya then.

 

Thinking I might add 1 mpg anyway.

 

 

Some of those are awfully clean.... (burning lean.) Third one in from the right is the color you really want to see. No oil fouling though, and that is most certainly a "Good Thing".......

 

1,2,5, and 7 are real clean. Can the fuel trim (assuming long term) be adjusted or is that hard programmed in the OBD1? Or does it go beyond fuel trim...perhaps injectors or something else?

 

O2 sensor should correct for that..... but, apparently, it isn't being that on the ball. If I were really concerned about it, I might consider some flow-matched injectors, but, if the engine runs good, I likely wouldn't bother.

 

Yeah, I don't really notice anything, rough riding, hesitation, or anything like that. Perhaps the only thing that bothers me with the way it runs is I get some light knocking when driving up a hill. Had that knocking even after pulling and cleaning the snot out of the throttle body.

For the record, I replaced the original oxygen sensor in 2018 (22,000 miles ago) with an NGK 23023 sensor. If I'm not mistaken this was the OEM sensor?? I have only one oxygen sensor located pre-catalytic converter.

 

If you are getting spark knock, you may wanna consider some matched injectors..... I wish the PCM would track which cylinders are knocking... But, I don't think dodge discovered knock sensors until the third gen trucks came out.

 

Not sure what you mean by "matched" injectors.

One thing I changed last time I gassed up my truck is where I was buying it from. I had been extensively researching automotive fuels and came away convinced the fuel you burn in your car or truck can make a big difference...mostly over time. This was among a consensus of mechanics, labs, and engineers. There are a number of fuel brands that are considered "Top Tier Fuel"...yes, an actual certification you can look up online. For example: Shell V-Power Nitro+, BP/Amoco Invigorate, Exxon Mobile Synergy, Chevron Techron, and believe it or not, Costco...to name a few (there are more). What separates these fuels vs lower quality fuel is the detergents they use. All gas has minimum gov't requirements but they still fall short especially with modern engines. Among the very worst fuels you can burn is from BJs Wholesale Club. That's exactly the fuel I have been burning in my truck for years cuz it was the cheapest. I'm wondering if that has caught up with me. Well, the last fuel I bought was from BP with Invigorate and I will continue buying these better fuels. There are cars brought to mechanics that weren't running well and the mechanic told them to fill up with Shell V-Power Nitro+...a couple tanks, and then see how well their car was running. Some of these top tier fuels actually clean build up.

What motivated me to do this research was this 2024 Mazda CX-5 I just bought. Interesting engine design where they amp up the compression. Lots of benefits but one drawback is it tends to build up carbon deposits. Many of these modern engines require cleaner fuels so they have collectively pressured fuel producers to offer better gasolines. They have. Tear downs of these modern engines are showing that those who run on top tier fuels their engines stay clean. Injectors, fuel pumps/filters, and catalytic converters all last longer.

 

"matched" injectors all flow the same, for any given pulse width. Stock injectors can have a pretty wide flow range for the same duration.... Flow matched injectors all flow very close to the same amount of fuel. Don't think spray pattern really matters overmuch in these engines though. Stock vs four, or six hole injectors don't make a noticeable difference..... Stock fellers are pencil beam, they shoot a stream of gas directly at the back side of the smokin' hot intake valve, with effectively vaporizes the gasoline. Really not a bad idea, it works, and severs a secondary purpose of cooling the valve as well.