Gas mileage went DOWN! - Page 2 - Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more!
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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post #16 of 28 Old 02-21-2013, 06:08 AM
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Re: Gas mileage went DOWN!

Running that rich is only going to be caused by...(on a stock vehicle)
Fuel Pressure/Injectors
Engine Vacuum Low
Map Sensor Circuit Issues

You threw another component into the mix with a calibrated controller which cannot be checked as the cause.
What controller do you have?
Stock injectors?
2 or 3 Bar Map?
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post #17 of 28 Old 03-02-2013, 09:09 PM Thread Starter
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Re: Gas mileage went DOWN!

Car was scanned. On the scanner it shows the CTS being bad but the key on and off 3 times doesn't show it? New fpr fixed some issues and hopefully the new CTS will finish it off.
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post #18 of 28 Old 03-03-2013, 07:36 AM
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Re: Gas mileage went DOWN!

Which code is it showing for a bad coolant temp sensor? The only related codes that I've ever seen are 17 and 22.
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post #19 of 28 Old 03-03-2013, 10:05 AM Thread Starter
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Re: Gas mileage went DOWN!

22 voltage to high. and my car was spitting coolant yesterday too after half an hour of driving and started to idle super bad.
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post #20 of 28 Old 03-03-2013, 10:05 PM
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Re: Gas mileage went DOWN!

Spitting coolant from where? Did a hose pop? Or if it is coming out of the reservoir, and with temperatures about where they have been pretty much everywhere in the country, I'm going out on a limb to say that a head gasket has quit sealing.
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post #21 of 28 Old 03-04-2013, 04:36 PM Thread Starter
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Re: Gas mileage went DOWN!

Only leak i could find was sweat on the cap. No hoses popped, but it got all over the intake hoses and puddled up on the tranny. wouldnt doubt it. the HG is on its way out soon. im gonna go change the sensor now and we'll see how it goes.
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post #22 of 28 Old 03-06-2013, 08:55 PM Thread Starter
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Re: Gas mileage went DOWN!

@ NAJ 40+ and 3bar with custom cal.(Was working fine when installed)

Now im curious. So there are 2 sensors involving coolant. one for the computer one for the gauge. My gauge also is reading incorrectly. ( the fan is kicking on at midway operating temperature)Can replacing the sensor for the computer affect the gauge reading at all?
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post #23 of 28 Old 03-06-2013, 09:40 PM
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Re: Gas mileage went DOWN!

No, it won't affect the gauge reading. But the fan should kick on at midway operating temperature, unless the custom cal is one of those that kicks the fan on at really low temperatures.
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post #24 of 28 Old 03-07-2013, 09:17 AM Thread Starter
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Re: Gas mileage went DOWN!

Hmm usually it kicked on at the high end of operating temp. I guess I'll see when there is a day there isn't a blizzard outside to put the sensor in.
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post #25 of 28 Old 03-07-2013, 06:43 PM
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Re: Gas mileage went DOWN!

Temp reading for the controller for fuel and fan control comes from the coolant temp sensor.(2 wire sensor)
Temp reading for the gauge comes from the temp sending unit in the head above the oil filter.(single wire sending unit)
CTS has nothing to do with the gauge reading and the gauges are not accurate.
In the summer mine will go all the way to the 3/4 mark on the gauge before the fan cycles on, in winter the gauge only reads to the 1/4 mark when the fan kicks on but CTS voltage is the same in both summer and winter.
If you want to verify the actual temp when the fan kicks on backprobe the CTS connector and read voltage.




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post #26 of 28 Old 03-07-2013, 10:38 PM Thread Starter
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Re: Gas mileage went DOWN!

Ahhhh that makes sense. Just out of curiosity. I have 2 sensors. One is an OEM and one has the PN 33004281. I noticed the OEM had a bigger bolt size on it. Do you think any different with voltages. ( I found the other one in the parts box that came with it but I bought the OEM one just in case)
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post #27 of 28 Old 03-07-2013, 11:07 PM
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Re: Gas mileage went DOWN!

Food for thought,back in the day Dodge played with the fan. During warm up the fan will come on at about the time the thermostat will open. The problem they were dealing with was during warm up if you stopped, and the thermostat opened and there was any moisture on the outside of the radiator it would steam off when the thermostat opened. People would think the engine was overheating. So for that reason from a cold start they will cycle the fan on about the time the thermostat opened for the first time. This would draw the steam through the radiator and under the hood, thus you would not see the steam off the radiator.
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post #28 of 28 Old 03-08-2013, 06:34 AM
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Re: Gas mileage went DOWN!

^^^yup. It sounds silly, but the factory fan scheduling accomplished this. The vehicle had to be below a certain speed (1mph?) for that scheduling to occur, but still... Back in high school I wondered why the fan would be running after my 5 mile commute.

But the two sensors you have, though different manufacturers, *SHOULD* provide nearly identical resistance values.
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