Need Help 84 with a Code 44
Thread Starter
2nd Gear
Joined: Apr 2004
Posts: 2
Likes: 0
From: Seale AL
Need Help 84 with a Code 44
I'm having a major issue with my 84, my average mpg has dropped from 24 miles to the gallon to 13-15 miles to the gallon. There is no apparent leaks in the throttle body gasket or the intake manifold gasket. I have replaced the distributor cap, Rotor, and installed split fire plugs. Re-timed it to +6 degrees. I have also replace the ECM unit with no success. For some reason I continue to get the check engine light (Same code 44) but the mileage jumps back to 24 after the light comes on. It will remain at the better gas mileage until I shut her down. I have to have a bad sensor some where anyone got any ideas????
[Modified by JDKUG, 1:56 AM 4/29/2004]
:steering: Thanks everyone for your responses, The winner was Pete K. I replaced O2 Sensor and I'm back at 24mpg Thanks for the Support.... :party:
[Modified by JDKUG, 8:58 AM 4/30/2004]
[Modified by JDKUG, 1:56 AM 4/29/2004]
:steering: Thanks everyone for your responses, The winner was Pete K. I replaced O2 Sensor and I'm back at 24mpg Thanks for the Support.... :party:
[Modified by JDKUG, 8:58 AM 4/30/2004]
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
Re: Need Help 84 with a Code 44 (JDKUG)
A code 44 relates to a lean condition. I have seen a bad o2 sensor cause this but there are other causes possible. I would change sensor if it is older than 5 years and 50k. Otherwise a scanner will show o2 millavolts and tell you if it is bad. Hope this helps.
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
Re: Need Help 84 with a Code 44 (JDKUG)
Could be as simple as a broken vacuum line. I replaced all vacuum lines on my 84 a while back, as they were all rotten as hell.
How many pounds of vacuum do you have at idle and is the needle steady?
Also, does it idle high? Any chance there is an IAC stuck open? A broken vacuum motor in the thermac? Somehow the engine is ingesting more air than the ECM thinks it should, and it could be richening the mixture to compensate, thus killing your mileage.
When it sets the light it may be going back into open loop (limp home) mode, which is causing the funny readings on the MPG display.
Time to start the process of elimination.
How many pounds of vacuum do you have at idle and is the needle steady?
Also, does it idle high? Any chance there is an IAC stuck open? A broken vacuum motor in the thermac? Somehow the engine is ingesting more air than the ECM thinks it should, and it could be richening the mixture to compensate, thus killing your mileage.
When it sets the light it may be going back into open loop (limp home) mode, which is causing the funny readings on the MPG display.
Time to start the process of elimination.
Advanced
Joined: Feb 2004
Posts: 67
Likes: 0
From: Waterdown Ontario
Re: Need Help 84 with a Code 44 (JDKUG)
Hello
I had a simular problem with my 1985 C4.
It turned out to be the fuel pressure diafram.
I changed it and everything was back to normal
I suggest you take a look at yours.
:seeya
I had a simular problem with my 1985 C4.
It turned out to be the fuel pressure diafram.
I changed it and everything was back to normal
I suggest you take a look at yours.
:seeya
Race Director
Joined: Dec 2000
Posts: 17,551
Likes: 26
From: El Paso Texas
Re: Need Help 84 with a Code 44 (c4dhr)
Hello
I had a simular problem with my 1985 C4.
It turned out to be the fuel pressure diafram.
I changed it and everything was back to normal
I suggest you take a look at yours.
:seeya
I had a simular problem with my 1985 C4.
It turned out to be the fuel pressure diafram.
I changed it and everything was back to normal
I suggest you take a look at yours.
:seeya
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: Need Help 84 with a Code 44 (Frizlefrak)
The 85 is a TPI with the pressure regulator on the return line. On the 84, the fuel pressure regulator is integral on the rear throttle body.
Another cause of a code 44, could be a fresh air leak into the exhaust system. Additional unburned air will cause a lean reading from the O2, and the ECM will try to richen it, killing your gas mileage. Good luck, and...
RACE ON!!!
