Shadow_S14

So I've realized that my car is getting shit gas mileage. I have nothing in my car; it's a stock '95 KA24DE. I know some people get a 22-25 avg on their KA's. I am at a dead end and can't find an answer. I've changed the fuel filter, cap/rotor, plugs, wires, top O2 sensor. If anyone has any ideas as to what it could be let me know. Could it be an EGR (random codes on it) or temp sensor related problem?

spooled240

How many miles? Maybe your cat is getting clogged. Check your timing too.

Shadow_S14

Car is almost hitting the 200k mark. Could be that the cat is clogged, I'll check, but timing is fine. I was also thinking the injectors, any one know a good way to check them? And yeh it's sad how I'm wasting as much gas as a boosted car...

Zeratul

Turn on the car and look underneath the hood to see if any of the clamps for the fuel lines have come loose or if any of the rubber fuel lines have ruptured. Use your finger to poke and prod the rubber fuel lines to see if they leak from movement.

Livid_240sx

Clogged injectors, lay off the throttle and brakes, carbon build up in combustion chamber.

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'91 s13 (Drift Rocket Under Construction)
2000 civic Si Coupe (Daily)

blessedhellrider

yeah , i get bad mileage too ,but i stay in boost alot .

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kruked

Truth


Stpdmssglngth

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2014 Triumph Street Triple

S13alldayyo

My sr gets like 25 mpg lol hopefully a tune can get me to 30+ it's only a 4 cyl


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theultimatehero

Is the engine running normally? I had a bad knock sensor that put my engine in limp mode. Fucking terrible gas mileage during that time.

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frankies1390

+1 on knock sensor and or cat

S13alldayyo

Do you guys think 300 miles per tank is good?


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sleepyS14se

my stock ka24de (95 s14) gets MAYBE 270 to a tank.


And i just have no aspiration to check the codes because my s14 is one with a obd2 port but will not communicate with my snap on solus scanner. So i said to hell with it.... i am too lazy to do the BS required to pull the codes manually from the ecu.

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95 S14 se RB25DET 348whp

S14.5patches

I was getting bad mileage in my car had a injector go full retard and replaced it, gas mileage is a tad better with the new injector id replace them with new ones there expensive but itll feel more peppy and give you better mileage. Did for me at least.

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just because you can, don't always mean you should.

Dima1127

This might sound pretty stupid, but check your fuel lines for leaks, i had this problem before i was breaking my neck until i sat on a curb next to my car and noticed a drip behind the wheel, and it was gas. its doing better then a Prius now

JBB

stop shifting at 7k

sleepyS14se

i can't lol

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95 S14 se RB25DET 348whp

Shadow_S14

So I checked the Cat and all seems well. Although now I'm thinking it might be the knock sensor. I'll check it out soon. Injectors as well.
I too thought it was a fuel leak, but I traced lines from tank to rail; no leaks.

nismoka

Could try some injector cleaner first


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sleepyS14se

seafoam

msglenth

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95 S14 se RB25DET 348whp

turbos14

Do a professional injector clean, check base timing, egr helps gas milage if its not working then u will lose its help and possible run hotter which the computer will pull timing and dump more fuel to cool. To check how the engine health is you could do a compression test and vacuum test.

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hollerjeet

when my sr had a crazy drop in mpg but no change in anything else, ran fine, etc. etc.. it turned out to be a hair line crack in the exhaust manifold ( on the side so i couldn't see it from the outside). i replaced it with another one and bam.. everything good.

do you smell a exhaust leak anywhere?

Shadow_S14

So a quick update on my gas issue. I'm getting less miles to the gallon now, down to about 13mpg. There aren't any exhaust leaks that I could tell. I sent out my injectors to get cleaned, didn't change much, so that wasn't the issue. Two codes kept popping up. P0325 and P0400 or Knock Sensor and EGR System. I checked the Knock Sensor; it was cracked to shit so I changed it with a new one and checked wiring on harness/sub-harness and all is good with continuity and resistance. But the code still persists... any suggestions on this one? For the EGR I took out the EGR itself cleaned it out, got rid of all the build up inside and replaced hoses. I assembled it all back and noticed that when I push up the diaphragm in the valve it doesn't stall out or change idle speed at all. Although when I rev the car it does lift up as it should... I'm a little stumbled here, any insight would be great.

mechanicalmoron

Did you torque the knock sensor correctly?

I believe that not only can over-torquing destroy them, but under or over, and they will not read right, and the computer will tell you something's off.

Livid_240sx

Does your 14 feel bogged down? Are you having to slam on the gas to get her going? 10/10 I bet your in limp mode. Swap out your EGR.

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'91 s13 (Drift Rocket Under Construction)
2000 civic Si Coupe (Daily)

Livid_240sx

Try a compression test. You might be burning oil. You could have some fried piston rings. It could be a culmination of things.

Figure it out before this is you

http://ricecop.tumblr.com/post/78999...re-carnage-lol

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'91 s13 (Drift Rocket Under Construction)
2000 civic Si Coupe (Daily)

zerodameaon

Engine coolant temp sensor will do exactly this, turn your 25mpg car into 10-15mpg. I am surprised no one has mentioned that yet.

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Need to adjust your idle?
http://zilvia.net/f/s-chassis/395413...-pictures.html

Shadow_S14

Changed the CTS, let's see if it changes anything. I'll try the compression test to see how my engine is doing internally.

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A54

good ideas...

mechanicalmoron

Run some techron (the more expensive one) through it.

Remember that you directly choose how much gas you burn - the ECU must match the amount of air you admit with the throttle, to keep the AFR correct. (you can really tell if you have a pod filter, and hear the sucking - I don't really remember if you can tell with the stock airbox, if that's what you have).

Even if you're easy on the throttle and keep RPM's low, you're talking about freeway milage that other people get. On the highway I get great milage (AND with a super low compression, smoky, half dead motor), when I can make myself act like an adult with the throttle. In town? probably 8-18, depending on exactly how grown up my driving is.

Pretend you're driving a limo, and see how your milage improves. But either way, in town milage is MUCH worse. Starting uses a huge amount of energy, and stopping wastes a huge amount of energy.

Livid_240sx

https://www.youtube.com/watch?v=uwza...e_gdata_player

Like a limo, eh? Sounds like it could be fun.

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'91 s13 (Drift Rocket Under Construction)
2000 civic Si Coupe (Daily)