Is there a chance that the PTFE being bad would cause the truck to idle rough?? I keep getting the error code 401 and since I tried replacing the EGR valve already........

 

If you mean the DPFE, then yes. Replace it.

 

isn't that what i said(oppps) Thanks I thought that might help. Anyone tried the Autozone part or should I try somewhere else

 

I think you mean DPFE sensor & yes thats a common problem part for a P0401 code.

We've also recently seen a bad EVR as the root cause of a P0401 code, that a new EGR valve & DPFE sensor didn't fix, The EVR is a computer controlled vacuum switching valve, used to control the EGR valves operational duty cycle.

It can be tested with a vacuum pump tester, or a simple blow back test.

Check the "Tech Info" thread atop this forums thread listing page for EGR system info.

Let us know how it goes.

 

I just finished replacing the DPFE sensor and the check engine light came BACK on took it up to Autozone and had them pull the codes....the P0401 code is gone now I have three codes P1443,P0133,and P0153

Seems I can't catch a break. I had the negative cable disconnected for about two hours before getting these codes after replacing the Dpfe sensor

 

OK good feedback on the P0401 code, it seems maybe you've put that one to bed.

P1443=Small Or No Purge Condition. This would suggest you have a problem in the evap recovery system. Maybe a poorly fitting, or leaking vacuum line, or maybe an acting out vapor canister purge valve.

P0133 & P0153= O2 sensor circuit slow response, sensors 1, in banks 1 & 2.
A slow responding O2 sensor could be because it's lazy , or old & slow like me. Have you recently had a coolant leak & maybe the engine took a whif of coolant????? If so, even just a whif of coolant can do in an O2 sensor. Had it happen to my 99 Taurus 3.8L, after the Dealer replaced the head gaskets, guess they got some coolant in the exhaust manafold. It only took 3 miles of driving for it to set my CEL.

They checked the O2 sensors switch rate & they showed up slow, "lazy" was the term on the work order. Anyway, new O2 sensors fixed her up, this was in 97!!!!

Just some more thoughts for pondering.

 

Dang Rockledge, I just noticed my first post was on top of your DPFE reply, your faster on the draw than Bob Ayers!!!!
I gotta get a faster keyboard!!!! lol

 

no recent coolant leaks that I know of....but with this truck nothing would suprise me.....could the 1443 code be caused by a bad purge valve and could any of the other be caused by a bad EVR??? Jusr wondering. And by the way I sure appreciate all the advice,I do alright with all my own repairs it is my own troubleshooting that gives me trouble....also PAWPAW gave me a good idea what happened to my dad's taurus w/a 3.8 liter

 

anyone know of a rear suspension leaf spring swap for a 1999 ranger 2WD 3.0 to give me a little more weight capacity, besides an add-a-leaf kit?? Thanks!!

 

try posting about your leafs under a new topic, you more likely to get your question anwered there, rather then tagging to it to an un-related topic.

and welcome to FTE.

 

As I posted earlier, the canister purge valve probably belongs on your P1443 suspect list, along with any of it's vacuum lines & maybe even the canister itself, if you've ovefilled the gas tank recently & the fuel got warm & expanded enough to back up & flood the charcoal canister & saturate it. So imo you need to do some vapor recovery system inspction & touble shooting.

On the O2 sensor codes, I doubt you have a EVR problem, as your P0401 EGR code seems to have been cleared, when you replaced the DPFE sensor & the P0133 & P0153 codes have to do with the slow response switching time of both of the up stream O2 sensors.

The computer is unhappy with their response times, so you need to verify they are slow to react. You'll need a scan-tool, or oscilloscope, or computer, or some means of graphically presenting the O2 sensors against a time scale, to measure & confirm their response time.

If we're talking about your 97 Ranger, it might be helpful to know which engine you have & how many miles on it & if your having any driveability problems, like it being sluggish, drop in mpg, won't pass emissions testing, vehicle having over 100K mles, ect.
All or some of which which might indicate those O2 sensors are just pain tard & all tuckered out, like pawpaw!!!!! lol

 

I have a 97 Ranger w/3.0 170000 miles. No driveabilty problems and gas mileage seems to be better than a lot I hear about 16-18 a gallon. The one thing out of the ordinary is the Techron I added to the tank about three days ago.. I then added about 10 gallons of gas (gas and Techron at the same time)..I may just have to take it to the shop when I can to put on a scope...THANKS again for the advice and I lookm forward to reading more

 

Not trying to hijack your thread. We (my wifes) have a 93 T-Bird with the 3.8L and after a new set of headgaskets is installed that is a great little motor. Real good on gas too, and making more hp than my old 4.0L in my Ranger!

 

Is it possible that the purge solinoid or sensor being bad could also cause the the 0402 code. Also I noticed that when I disconnect the throttle position sensor that the idle drops way down(I am having the most trouble with the idle when I turn on the defrost)

 

The P0402 code is for excessive EGR flow & seeing as how it's computer controlled through a vacuum swiching valve, seem to me a faulty VSV or dirty stickng EGR valve, belong on your suspect list.

Idle problems, when you call for defrosting & the AC compresor switches on, usually point to an acting out IAC.

Let us kow what you find.