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I'm sure it's been covered...

 
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Old 03-15-2017, 09:48 PM
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I'm sure it's been covered...

I have a 92 with h23a. Mods are full exhaust full cai. New 0 sensor. Iridium ngks wires and cap rotor. I think I'm burning way to much fuel. As I'm sitting at less at 1/4 with just over 200 miles. Running premium. So any ideas?
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Old 03-15-2017, 10:06 PM
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Re: I'm sure it's been covered...

are you on a basemap or a custom tune?
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Old 03-16-2017, 09:07 AM
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Re: I'm sure it's been covered...

Base car was factory before I go it. Seemed to run rich before I did a little work.
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Old 03-16-2017, 05:10 PM
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Re: I'm sure it's been covered...

Should I look into a programmer or tune. Or do you think something else is the problem?
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Old 03-16-2017, 09:34 PM
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Re: I'm sure it's been covered...

If it has the stock ECU then it can't be tuned. Prelude's run a bit rich from factory too.

It all depends on how/where you drive, that sort of mileage is quite acceptable if you drive mostly in a hilly city with your boot to the firewall.

What condition are your plug leads in? How's the timing? What is the compression like? Could it be that your fuel gauge or sender is faulty? It'll run richer on startup, so a defective coolant temp sensor can cause issues. Is it throwing any misfire codes? Have you checked for vacuum leaks? How does it idle? Have you tried an injector cleaner? Is the air filter old or dirty? Did you get a new cat with the exhaust? What kind of oil do you run? Any of these things can contribute to excessive fuel consumption too.
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Old 03-16-2017, 11:04 PM
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Re: I'm sure it's been covered...

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Originally Posted by tassievteclude View Post
If it has the stock ECU then it can't be tuned. Prelude's run a bit rich from factory too.

It all depends on how/where you drive, that sort of mileage is quite acceptable if you drive mostly in a hilly city with your boot to the firewall.

What condition are your plug leads in? How's the timing? What is the compression like? Could it be that your fuel gauge or sender is faulty? It'll run richer on startup, so a defective coolant temp sensor can cause issues. Is it throwing any misfire codes? Have you checked for vacuum leaks? How does it idle? Have you tried an injector cleaner? Is the air filter old or dirty? Did you get a new cat with the exhaust? What kind of oil do you run? Any of these things can contribute to excessive fuel consumption too.
Plugs are new less than 500 miles on everything. Wires plugs filter, fuel filter, fuel pump, fuel lines, oxygen sensor, headers, downpipe, no cat, mid pipe, muffler, idle is normal, cap and rotor new. No cel, no miss fire.

I'm not sure of compression I'm assuming stock, the car is quite literally stock besides the complete tune up I'm running ngk iridiums, the full exhaust and cai. IV done nothing else except upgrade the headlights. And no I granny shift. I'm not looking to race it or beat it. No leaks. I don't even burn oil. I run premium. It's only got 78k miles.
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Old 03-16-2017, 11:06 PM
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Re: I'm sure it's been covered...

I mostly drive highway. That's what I don't understand... At idea for a few minutes I can smell the richness...
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Old 03-18-2017, 05:30 PM
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Re: I'm sure it's been covered...

Upon driving around longer today. I got a cel. Code 43. Literally all new fuel parts. Tank pump filter lines were replaced. And along with the 02 sensor when I did full exhaust. My Rpms at idle are normal. And shifts beautiful. Rpms at shift change are no higher than 3500 or less. At idle I the cab fills with fuel smell and goes away after driving. Cel doesn't come on unless driving longer than 20-30 min. No smoke on startup or anything​.

What about the fact I have no cat. It's headers to 2 into 1 too straight to muffler. Not enough back pressure?
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Old 03-18-2017, 05:30 PM
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Re: I'm sure it's been covered...

Upon driving around longer today. I got a cel. Code 43. Literally all new fuel parts. Tank pump filter lines were replaced. And along with the 02 sensor when I did full exhaust. My Rpms at idle are normal. And shifts beautiful. Rpms at shift change are no higher than 3500 or less. At idle I the cab fills with fuel smell and goes away after driving. Cel doesn't come on unless driving longer than 20-30 min. No smoke on startup or anything​.

What about the fact I have no cat. It's headers to 2 into 1 too straight to muffler. Not enough back pressure?
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Old 03-18-2017, 06:45 PM
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Re: I'm sure it's been covered...

is it h23a1 or h23a?
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Old 03-18-2017, 09:41 PM
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Re: I'm sure it's been covered...

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is it h23a1 or h23a?
It's the non VTEC. So I'm pretty sure it's the h23a1. I can't remember which is non VTEC. But it is an si.
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Old 03-19-2017, 12:10 AM
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Re: I'm sure it's been covered...

Changed fuel filter and try to clean injectors?
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Old 03-19-2017, 03:03 AM
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Re: I'm sure it's been covered...

Another great read:

CEL-Code 43 explained

Code 43 = either low fuel pressure (blocked fuel filter, failing fuel pump etc.) or a vacuum leak. Can also be caused by a bad fuel pressure regulator. Worth getting someone with a fuel pressure meter to check how much pressure you're getting on the rail at various RPM.

There is a small chance that it could be due to the de-cat. I have heard of these things running rich and throwing codes in this instance due to too much flow past the sensor. I think that you can get a spacer to fix it though, but I thought it was more related to throwing O2 related codes in 5th gens. Don't worry about too little backpressure either, there is no such thing.
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Old 03-19-2017, 05:51 AM
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Re: I'm sure it's been covered...

Thanks guys. I know all about the code. I'm more concerned with the mpg. I honestly can deal with code but a 4banger getting mpg of a V8 I can't deal with... I know the fuel pump, fuel tank and lines are all new. And I'm assuming that if the garage did all of that... They would have done a new filter. Besides the point... Anything else it could be that's causing such poor mpg? I'll look into the the cleaning injectors, anyways to clean them or suggestions? I did check the seafoam thread and plan on doing a treatment. But wasn't sure if anyone had any other ways to clean em.
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Old 03-21-2017, 10:15 AM
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Re: I'm sure it's been covered...

When was last valve adjustment done?
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Old 03-21-2017, 11:19 PM
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Re: I'm sure it's been covered...

Haven't performed it yet. I'm at 77k second owner. I will as soon as we get warmer weather.
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Old 03-21-2017, 11:21 PM
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Re: I'm sure it's been covered...

But in any case... You think the valves are that far off that I would get such poor mileage... Wouldn't I have engine noise?
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Old 03-22-2017, 04:08 AM
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Re: I'm sure it's been covered...

If you have nwd ignition parts, checkd fuel system, cleaned egr etc...so valves might be next step

Or then just your af ration is gone wrong because of your exhaust with stock ecu
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Old 03-22-2017, 08:42 AM
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Re: I'm sure it's been covered...

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If you have nwd ignition parts, checkd fuel system, cleaned egr etc...so valves might be next step

Or then just your af ration is gone wrong because of your exhaust with stock ecu
Ok. I do some cleaning. And try that out. Thanks.
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