1st Gen Lunchtable Thread - General Discussion

Just take a long shaft of rebar and jam her in there till it’s all crunchy

 

Call me a boomer but I'd like a CAT to do what it's supposed to do... currently when I sit an idle I get a real strong smell of fuel in the exhaust, if I bust out the CAT innards I'd just end up with a worse gas smell right?

My LTFT is never over +/-10% so assume I'm not dumping extra fuel to cause the smell

 

What’s the number value attributed to 10% of the LTF? My truck likes to idle around 11 LTF, 0-4 STF

 

@Wulf Ford
@SouthernYoder XJ



https://www.instagram.com/p/CDZ1d6RhkPi/?igshid=uxp3zwytwyku

 

I'm not an expert... I'm only a google researcher and first hand knowledge experiencer...

But ideally your LTFT should be close to zero when the engine is held at a steady speed. Negative numbers mean rich conditions (like a stuck open injector) and positive numbers mean a lean condition (like a vacuum leak) always check LTFT at idle and 2500rpm. With the trim level being 0% it means you have 14.7 parts of air to every 1 part of fuel.

I was always told +/- 10% is the edge of your acceptance range

 

The LT will adjust itself with input from the ST.. I've never been taught what you want to see in the ST numbers, I was always told to look out for the LT



You're still running the supercharger correct? Without the extra injector? That would explain a LT of 11% at idle.... you're just sucking too much air

 

Ohhh the accuracy.

 

When you press on the face it squeezes the microscopic breaks in the old solder joint back close enough for the current to travel. When you get it apart you'll likely find what 99.9% of those of us who have opened the clock up found.
On the three similar resistors, the probe is pointing to one, you just solder over the existing is fine. I couldn't see the cracks in the solder with my naked eye. I just trusted that the issue was in that, and it was, my clock had been inop for a couple years

 

Nice! I'll have to tear into it then... I'm not a fan of the stock clock location but until I create my custom dash that has it built in I'd still like to know what time it is

 

I cheated my P0420 by leaving the rear most O2 sensor not tightened down. Actually left it loosely installed so exhaust can escape intentionally. Code hasn't come back and reviewing the scanner data while driving and stuff, I'm comfortable with my 'fix' until I need to replace the exhaust.
I actually 'fixed' it this way after realizing my tags were expired and needing to get all the OBDII and smog monitors completed for the test. Worked great

 

Yeah me neither in location but a fix that doesn't cost money..... I'm on board.
I have this taco to save me money not to 'invest' into it

 

both unfortunate

 

ideally you want both numbers to be between -10 and 10, the closer to 0 the better. Your LTFT is a tad lean if it's always around 11 at idle, usually points to a small vacuum leak

I need to figure out how to read fuel trims on my Scanguage, it's not easily accessible like it was on the Torque app.

 

My air fuel ratio was usually at 14.6 even when it was running lean which is... weird?

 

I don’t think fifth injector is really a thing in the four cylinders. It’s much more common on the six. I used to have 01-04 pink injectors that pushed more fuel, but they were causing my misfire so I got rid of them and put the stock brown ones back.

I have methanol injection I never bothered to finish hooking up as well as a planned AEM FIC piggyback down the road.

 

you have a Wideband AFR gauge installed or just referencing the ECU's afr readings?

 

with a bad injector(s?) I was seeing LTFT of -17-25, rough idle, low power, rich CEL

"new" injectors brought it down to -7 to +2 ish

 

Definitely no vacuum leak anymore. I bought a smoke machine just for this purpose. So that lean has to be a bigger underlying issue, or it’s just I’m not pushing enough fuel. My trims are 4 LTF 0 STF at full throttle though, so it isn’t going lean at full load.

 

I had a real Plex DM6 AFR gauge with the oxygen sensor pass through setup. I took it out to diagnose my misfire issue. But I don’t plan on putting it back because I don’t like how it replaces the factory o2. I’ll have a bung welded eventually.

 

weld a bung eventually, install methanol eventually....stop collecting antique police light bars and finish your truck


I should be one to talk I really haven't been doing much to my truck lately