Hello,

I have a 97 ranger 2.3L XLT and I recently check my car with an OBD II scanner and some codes popped up like P0401"insufficient EGR (exhaust gas recirculation) flow" and P1443 code "Evaporative Emission Control System Control Valve".

For the first one, I replace both DPFE sensor and EGR valve as mentionned on the forum. So far so good, the code disappear by itself and never came back.

For the 2nd one, I read on the forum how to fix a P1443 code, by most likely replace the canister purge solenoid / flow sensor replacement in the first place. So I order a this part at tascaparts (great dealer by the way) and had it replace and until now, the code still pop up and I feel that my gas mileage decrease to 15-17 mpg (23 mpg before replacing parts).

By the way, I have a P1000 code error (Monitor testing not complete) and I know how to fix it but didn't have time to do cleared it.

So my questions are:
1- what can I do or check to clear the P14443 code ?
2- Is my gas mileage affected by the P1000 and P1443 code ?

Thank you guys.

 

For p1443

Check the vacuum lines that run from your canister to the solenoid you just replaced and on down to the intake. There could be a small crack in the lines. For a 1997 model you may want to just replace them.

 

Thank you sheltonfilms ! I'll try that.

 

I've been fighting an intermittent 1443 code for some time now. I have heard that a faulty gas cap can be the cause. Is there any truth to that? Also, if the fact that the "system" has a leak (bad cap) then wouldn't a leaky fuel tank or crack filler neck cause this problem also?

 

I've seen another code in relation to the gas cap/fuel neck. On my Mustang I had the p1443 code and another code and my filler neck grommet in the tank was shredded. I replaced it and the other code went away. I forgot what the code was. p1443 means that the computer didn't see any flow coming from the canister. You have your canister connected to the solenoid and then to the sensor (way it is on the mustang) and then to the intake manifold. The solenoid opens when the PCM wants it to allowing vacuum to suck the fuel vapors from the canister. The sensor (on the mustang) is a temperature sensor and when the vapors/air is passed through it, it shows a change in temperature, thus suggesting that the line is flowing. This code means that computer didn't detect this flow. Usually means the solenoid or the sensor. For some reason I've never seen this sensor (may have just over looked it) on a ranger (at least newer models).


Also I think there is a pressure sensor on the gas tank for that other code I was talking about

 

I checked the vacuum lines and no signs of leaks or cracks.
I also checked the line goind from the charcoal canister to the gas tank. The first vacuum line looks OK, a litlle old but no signs of leaks or else.
The second line to the fuel filter is in metal and no particular signs either.
I couldn't check the line going from the fuel filter to the gas tank cause it's too difficult.

I don't have another code error besides P1443 and P1000.

 

Good luck. I have both codes also and get about 15.5mpg.
I've replaced everything on my truck except the steel line and the parts inside the tank(I check it for leaks and its fine).
At this point, its either an electrical problem or something inside the tank.
I even replaced the pressure check valve and rubber gasket on top of the tank. I checked the harness, no shorts or broken leads, I even replaced the PCM.

 

Every time I look it up with ALLDATA and do what it says, I get pointed back to something similar to this.
http://www.obdii.com/drivecycleford.html

 

I was running P1443 code so I went ahead and swapped my evap canister purge valve out because that’s what autozones OBDII read it as. The code cleared itself almost immediately. About a week later I’m starting to have a round idle, at about 750 rpm the truck wants to die but if I give it gas, it stays on. Well the P1443 code decided to pop back up, so I went ahead and replaced all of the hoses from the charcoal canister to the intake manifold. As well as the other canister purge valve but the code is still there and still rough idle. To my understanding p1443 means it’s “low or no flow” from the charcoal canister to the intake? With that being said could it possibly being my charcoal canister itself that’s clogged up?