LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Code PO443

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Old Mar 20, 2008 | 03:15 PM
  #1  
texas97z's Avatar
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From: Flower Mound, Tx
Code PO443

I know what the code is but not sure why I have it. We removed the air and egr,had it tuned out, and have had no problems to date (over 6 months). The whole time we just ran that line for the EVAP solenoid straight to the TB without code or problem. Now the car is throwing that code and when driving you have to keep the RPMs up or it will stall. Are the two related or no?

Thanks as always for the help.

Edit: Should I just put this back on. I originally thought it was part of EGR but it isn't. Maybe problem is running way to rich and that is why the stall?

Last edited by texas97z; Mar 20, 2008 at 03:45 PM. Reason: didn't want to bump back to top
Old Mar 20, 2008 | 04:40 PM
  #2  
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Originally Posted by texas97z
Should I just put this back on. I originally thought it was part of EGR but it isn't. Maybe problem is running way to rich and that is why the stall?
If you still have th parts, it would be an easy test to see if the code goes away.
Old Mar 20, 2008 | 04:57 PM
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P0443 Evaporative Emissions (EVAP) purge solenoid control circuit

Is the solenoid on there or not? If it is then it might be stuck open and causing a constant vacuum leak.
Old Mar 20, 2008 | 04:58 PM
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Originally Posted by shoebox
P0443 Evaporative Emissions (EVAP) purge solenoid control circuit

Is the solenoid on there or not? If it is then it might be stuck open and causing a constant vacuum leak.
yeah and if it is not..... bingo
Old Mar 20, 2008 | 05:02 PM
  #5  
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P0443 is just checking the circuit continuity for the solenoid, not "flow" or "no flow". Could be defective wire or solenoid, or no solenoid. Leaving the air flow into the TB at all times could cause a lean condition. Or maybe the canister is saturated and its pulling in some liquid fuel.
Old Mar 21, 2008 | 08:03 AM
  #6  
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From: Flower Mound, Tx
Well last night we found out that the TPS was cracked so decided to replace it, also adjusted set screw in throttle body till it moved the blades,may not be perfect but no scanner at home.Will set it perfect tonight after work at buddies shop with scanner. I did find the solenoid and hooked it back up. Not sure if still throwing the code or not. The car is running better, but still tries to stall when coming to a stop, just not right away. Also lots of backfire when slowing down while it is in gear. I know in my TPI car, if fluid got in that canister, the car would not run(or atleast not well). I am quessing same with this car?

So where is the cannister, back by the tank?

Thanks again.
Old Mar 21, 2008 | 10:22 AM
  #7  
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From: Hell was full so they sent me to NJ
Yes, the canister is in the driver's rear fender. There is a plastic cover in the wheel well.

If you think its the vent from the canister, try pulling the hose off the throttle body, and capping the connection on the TB.

From Shoebox:

http://shbox.com/1/evap_system.jpg

http://shbox.com/1/1996_evap.jpg
Old Mar 21, 2008 | 01:31 PM
  #8  
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I think it might actually be fluid in the canister that I need to drain. The reason I think that is there has been a couple of times that I distinctly remember a small stain of gas back there on the ground after an eppisode of not running right, but upon inspection of the neck and tank, found no leaks. I am going to try to pull that canister after work and dump it out, see if that helps.
Old Mar 21, 2008 | 03:52 PM
  #9  
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From: Hell was full so they sent me to NJ
If the canister gets saturated with fuel, it needs to be replaced. Do you ever "top" the tank to the point where the fuel level is into the fill pipe?
Old Mar 21, 2008 | 04:17 PM
  #10  
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No, I stop at the first or second click, depending on how empty meter was showing and how many gallons I have put in.
Old Mar 23, 2008 | 07:10 PM
  #11  
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From: Flower Mound, Tx
Alright, no fluid in canister and running bad was completely unrelated(wire was burnt on inside of header tube so didn't see it). Code went away with hooking the evap back up. Car is not burning my eyes anymore either from running so rich. Good stuff. Thanks for the help all.
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