Hey all, first I just want to say how glad I am to have found this site... it's awesome!

I've got a '96 Ford Ranger 4.0, 5sp extended cab, XLT with almost 240,000 miles. Best, most reliable vehicle I've ever owned, hands down... Only thing I've ever had it in the shop for was a new clutch at 180,000 miles... everything else I've been able to fix myself. I think the EGR was the only hiccup I've ever had with this truck... it's been bone solid otherwise.

The other day, I started getting a very high idle, 2300-2400rpm. After about 15-20 seconds it will usually (not always) idle down to normal speed, but with a very rough, "loping" idle.

I went out today and bought a OBD II code reader today, and pulled these codes off of the computer...

P1443 Evap Emission Control System Control Valve

P0401 EGR Flow Insufficient

P0171/P0174 System Too Lean (Bank 1/2)

I've had P0401 for several years now, and just live with it with no noticeable effects. Got tired of replacing the sensor/cleaning the EGR every 50,000 miles or so.

The other 3 codes are new to my truck. I've been reading all evening about the other codes, in particular P0171/P0174. Most everything I've read says "rough idle", but nothing I've read so far in association with these codes says "high or fast" idle. What is your feelings about this set of symptoms?

How would you guys tackle the P1443 code? Where do I start?

Thanks!! (PS... I'll keep researching too)

Brian

 

Forgot to add, I've already changed the IAC and cleared the codes by disconnecting the battery on advice from a mechanic buddy... which did seem to help for the first drive... but since then it is back to where it was before the IAC change... I think during the "improvement" period, the computer was re-learning everything that was wrong...

 

P1443--Check the Purge Sensor(E6ZZ-9C915A) or Canister Purge Flow(F57Z-I4A606)
Located(On my "97 4.0) on the L/H side just below the battery check hoses for leaks
and gas cap on tight. Replaced the Purge sensor(9C915A--less expesive--$25) and reset. Fixed the lite-never came back on.

Good Luck!

 

Irvinf,

Thanks for the reply... looks as if a guy is pretty much on his own around here except for a helpful soul like yourself!!

I found a vacuum hose that had slipped off the nipple on the intake manifold, and reinstalled that. I also removed the cannister purge sensor and the cannister purge flow valve and cleaned both with Throttle Body Cleaner. I got a lot of black gunk out of the purge sensor... so hopefully that fixes it. The tubing connecting these needs to be replaced, but it was still intact enough to work, hopefully.

I also removed the EGR flow sensor, and cleaned out both chambers with TB cleaner as well.. that trick usually works 2 or 3 times before the sensor totally fails... but, I can tell no difference at all in the way the truck runs or in MPG, so, if it doesn't fix it, it's going to stay inop... this truck isn't a daily driver anymore, so I'm not too concerned about it.

Thanks again for the reply

 

Hope my info helped. Let us know if your CEL goes out. Replaced sensor last week.
Dealer replaced both in Feb. for $300.