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Engine Management, Fuel, Spark, EGTs, and Air/Fuel Ratios This forum includes general electrical, modification, tuning, repair, replacement, identification and restoration of all components mentioned above including SMEC, SBEC, Logic Modules, aftermarket engine management, etc. Nitrous oxide posts go in here. This is the place

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Old 02-15-2013, 12:37 AM   #1
Gas mileage went DOWN!  
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Car usually last a few weeks the way I drive it. Not changing any habits or time/distance. Wide-band reading is all normal.

Possibly a separate issue. If I do beat on the car it will want to stall at idle. It will run at like less than 100 rpms struggling to stay turning. With this issue the wide-band reads a 10.1 and smells like gas bad.

My guess was the fpr, CTS or O2 sensor, but why would the problem go away if I let the car sit for an hour.

It now always gets BAD mileage. I'm talking an 1/8th a tank a day after maybe 15-20 miles.

Last edited by 90benson; 02-15-2013 at 01:09 AM.. Reason: CTS?????
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Old 02-15-2013, 01:14 AM   #2
Re: Gas mileage went DOWN!  
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I assume now that with this bad gas mileage not going away that your wideband is showing rich all the time now? Any codes?
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Old 02-15-2013, 01:58 AM   #3
Re: Gas mileage went DOWN!  
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Sounds like you have a stuck injector. Have you pulled the plugs to see if they are all wet or just 1?
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Old 02-15-2013, 08:01 AM   #4
Re: Gas mileage went DOWN!  
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Wideband always runs a tick rich now, I can pull them and let you know.
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Old 02-15-2013, 08:23 AM   #5
Re: Gas mileage went DOWN!  
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Quote:
Originally Posted by 90benson View Post
My guess was the fpr, CTS or O2 sensor
Lets not guess, lets diagnose.

Quote:
Originally Posted by dragbaron View Post
Any codes?
This has not been answered, are codes present?

Quote:
Originally Posted by The Pope View Post
Sounds like you have a stuck injector. Have you pulled the plugs to see if they are all wet or just 1?
Have you connected a fuel pressure gauge to check pressure and leakdown?
The controller has no clue what fuel pressure is, it "assumes" pressure is correct when it makes it fuel corrections.
You cannot "assume"

Also...Raw Fuel/Black Rich, Intermittant...
Map Sensor is "dominant" fuel control.
Check to be sure you do not have a Collapsed/Soft/Cracked vacuum line and are not losing the vacuum signal to the Baro Solenoid/Map Sensor.
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Old 02-15-2013, 01:53 PM   #6
Re: Gas mileage went DOWN!  
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codes 12 and 36
idle at operating temperature reads 13.6
I back probed the CTS today using one of your post in here.
Spark plugs are dry
Vacuum lines are good and ziptied
I will be doing the fuel pressure and leakdown soon and will let you know.
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Old 02-15-2013, 03:14 PM   #7
Re: Gas mileage went DOWN!  
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pressure at the rail with key on engine off. 26. engine on 49.
My friend has a fpr so were gonna run it with that and if it still is bad we think its the pump.
correct so far?
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Old 02-15-2013, 04:32 PM   #8
Re: Gas mileage went DOWN!  
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+1 on NAJ's MAP response. Fuel pump issues aren't going to cause the engine to run rich. I would try swapping out the MAP/Baro combo to see if you have a failure there. Only time I have experienced extreme rich conditions on a stock turbo engine is when the MAP/Baro vacuum line was comprimised or the MAP sensor was faulty.
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Old 02-15-2013, 05:06 PM   #9
Re: Gas mileage went DOWN!  
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I didn't bother checking the voltage on the MAP because there wasn't a code for it but it's worth a try.
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Old 02-15-2013, 10:21 PM   #10
Re: Gas mileage went DOWN!  
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Codes are always first, but plugs can tell a story though. Shut it down while it is coughing and spitting fuel and pull the plugs hot real quick. That takes out the single injector problem.

The issue with codes also is that if the sensors read wrong the computer will just go with it and not toss a code. So unless you run a scanner while the problem is going on to read everything it can be a guess. The injector can be told to shut and not shut, I've also had the bodys come apart under boost.
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Old 02-16-2013, 02:41 PM   #11
Re: Gas mileage went DOWN!  
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Will do. What I might have to do is get it the full boost run (that causes the want to stall at idle problem) with a scanner on at the time. I think the problems are related. I'll let you guys know the story on Tuesday when I'm back in school to test it all.
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Old 02-17-2013, 07:01 AM   #12
Re: Gas mileage went DOWN!  
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Depending on what you are looking at with the scanner remember...
Our controllers do not show live data, they update every 1.25 seconds so in a lot of instances it is better to read live data with a voltmeter.
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Old 02-20-2013, 05:40 PM   #13
Re: Gas mileage went DOWN!  
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Acted up again and i pulled the plugs right away they're all wetter than they should be and the wideband was reading in the 10-11s. I was reading another post on here about a guys cal being bad and he had all the same symptoms as mine except mine does it on occasion rather than every time.
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Old 02-20-2013, 07:34 PM   #14
Re: Gas mileage went DOWN!  
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How is your tire pressure? Are the brakes dragging?
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Old 02-20-2013, 07:51 PM   #15
Re: Gas mileage went DOWN!  
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35 psi and good brakes
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