'07 Pacifica 4.0L P0171 P0174

Hey what's going on guys? I had this 2007 Chrysler Pacifica 4.0 and the customer went to auto zone and they pulled the code for p0171 and p0174 and they said the canister purge solenoid is the fix. So the boss gave it to me and check engine light was off. Long story short for some reason the code was still there and I checked the freeze frame as Paul danner taught me and it was at idle of 701. Temp was 197. Long term for both banks was at 23 which I know is a vacuum leak. I start the car put I hear no hissing or anything and visually I didn't see any hose off or intake boot torn or no hoses cracked. So I told the boss I need to smoke the intake. The car will come back Monday but I'm thinking the intake will be smoking out air. Just wondering if anybody ever ran into this issue with this make and model and codes. I can't think of anything else that would leak. If somebody has advice greatly appreciate it

Hey Jay!

I totally understand your thinking behind smoking the intake, but I doubt that's the real issue at work. These are speed density systems, and won't react to a vacuum leak by going lean the same way a MAF system will.

The next check I'd suggest is watching the trims during a test drive. You definitely found lean trims at idle in the freeze frame data, but I'd want to know how they react off idle and cruising. A WOT fuel enrichment test would be a good idea, too.

A stuck open purge valve is definitely possible. An easy way to eliminate it would be to disconnect the vapor line from the tank and plug the purge valve. If the trims don't improve significantly, then move on with your testing. If they do, you may be onto something.

Sorry to bother u Tyler but where would this be located. I seen it right by the air filter box with hoses going into it. Just want to be clear it's not by the charcoal canister. It should be up top in the engine bay am I correct. Because I've seen several purge valve but on Chrysler I never had to replace it. And why wouldn't it set a evap code. I gotta get a Chrysler performance book from atg because I need to know why and how this works. If u can guide me or an image and can I pinch the hoses and check fuel trims. Because it has two hoses. Which one to disconnect. That I'm not good at. I have not run into something like that

follow the one that goes to the intake and cap that port off with something. OR unplug the purge connector tje one by the airbox then unhook the line that runs to the canister install a vacuum gauge where the line was see if your getting vacuum.you shouldnt get any. might have to tap on the valve with a screwdriver to get it to.ive done that on many intermittent ones on ford that leaked...

Jay2034 wrote: Sorry to bother u Tyler but where would this be located. I seen it right by the air filter box with hoses going into it. Just want to be clear it's not by the charcoal canister. It should be up top in the engine bay am I correct. Because I've seen several purge valve but on Chrysler I never had to replace it. And why wouldn't it set a evap code. I gotta get a Chrysler performance book from atg because I need to know why and how this works. If u can guide me or an image and can I pinch the hoses and check fuel trims. Because it has two hoses. Which one to disconnect. That I'm not good at. I have not run into something like that

Cheryl covered it perfectly. Not setting an EVAP code might depend on Chrysler and their code set criteria for purge faults. I know GM has a specific code for this problem, and it's detection strategy is pretty darn good. Ford's will set leak codes, which can be a bit misleading. :silly:

Let me know if you get that ATG manual? The two light duty diesel books I have are fantastic, hoping the gas versions are the same.