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fault codes po171 and po174


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mp5912
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Dec 15, 2011, 9:04 PM

Post #1 of 18 (7385 views)
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These cosed are on a 2000 Ford Explorer SOHC 4.0. 207,000 miles.
the codes says i have a lean mixture in banks 1 and 2. i have replaced the maf sensor and the idle air control solenoid and checked for vaccum leaks. i can find no vaccum leaks in the engine compartment. i even tried the starter fluid trick and got no response from the engine. what else can i do. Can u give me some more avenues to look at?


Hammer Time
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Dec 15, 2011, 9:16 PM

Post #2 of 18 (7367 views)
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You might need to smoke test it but I'll almost guarantee you have vacuum leaks.




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Sidom
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Dec 15, 2011, 9:29 PM

Post #3 of 18 (7357 views)
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It would realliy help to be able to look at freeze frame data on this one......This is a snap shot of certain PIDs (info) when the failure occurred.

These have a problem with plenum gaskets leaking when they're cold, after everything warms up, they seal enough not to set a code.

If you could access FF data, you would see the failure happening when it was cold. To confirm you could smoke it when it was cold. If I remember right Ford has an upgrade kit available with better bolts..... I'm sure Z could confirm this for me....






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Discretesignals
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Dec 15, 2011, 10:13 PM

Post #4 of 18 (7343 views)
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I just did an 01 Ford Exploder 4.0L (E) that had lean codes and rough idle when first started. Vacuum leak at plenum gaskets. Also did a tune up including wires while I had the plenum off. Runs like a champ and fuel trim was perfect before it was handed off to the customer.





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Hammer Time
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Dec 15, 2011, 10:24 PM

Post #5 of 18 (7333 views)
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I smoked one yesterday on an Escape and found the same problem.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Dec 16, 2011, 7:55 AM

Post #6 of 18 (7320 views)
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If you do end up pulling the plenum off, there is a fresh air pipe elbow that connects to the fitting that feeds the idle air control valve. From the rubber elbow a plastic pipe goes underneath the intake and acts as a sound damper. The other pipe from the rubber elbow goes to the air duct right after the filter. DO NOT TAKE THAT ELBOW OFF THE INTAKE! You'll rip the elbow and be in a world of Sh!t. That part cost $230 and can be bought only from the dealer.





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(This post was edited by Discretesignals on Dec 16, 2011, 7:58 AM)


comnavguy
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Dec 16, 2011, 3:32 PM

Post #7 of 18 (7305 views)
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Can you 'splain "smoke test" ? I gave up Pall Malls a long time ago, so my smoking machine is no longer available for use.

Tell us/me where smoke machines are sold, what they are called, etc. Are they anything like the smoke machines used in haunted houses ?


Hammer Time
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Dec 16, 2011, 4:11 PM

Post #8 of 18 (7304 views)
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Yes, they are very like that but have some sensitive gauges for testing. They find air leaks in systems.
Here's a video on how they are used. I have this one and it runs about $1200

http://www.redlinedetection.com/videos.aspx




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sidom
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Dec 16, 2011, 6:08 PM

Post #9 of 18 (7298 views)
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I get a cheap cigar, light it up, start the engine and hook the cigar to the brk booster vacuum hose....






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(This post was edited by Sidom on Dec 16, 2011, 6:09 PM)


Discretesignals
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Dec 16, 2011, 8:28 PM

Post #10 of 18 (7287 views)
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Ok Sid, please tell me that is a joke. You'll give your car muffler cancer.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Sidom
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Dec 16, 2011, 8:30 PM

Post #11 of 18 (7283 views)
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In Reply To
Ok Sid, please tell me that is a joke. You'll give your car muffler cancer.


LMAO..........I knew you guys would get it but was wondering if I needed to put a disclaimer on it for the DIYers....Sly






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Discretesignals
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Dec 16, 2011, 8:41 PM

Post #12 of 18 (7276 views)
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Scotty Kilmer has the answer..check it out..

http://www.youtube.com/watch?v=zMok2y05jNE





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Sidom
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Dec 16, 2011, 9:09 PM

Post #13 of 18 (7269 views)
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I have yet to click the link but reconize the name.........I think I'll click the link for pure entertainment.......lol

Yup....Just as I thought.........always entertaining......lmao........You know, I have about a dozen jokes to post about that vid........BUT this being a family site & all.....guess I better not........Cool






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(This post was edited by Sidom on Dec 16, 2011, 9:13 PM)


Hammer Time
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Dec 16, 2011, 9:18 PM

Post #14 of 18 (7262 views)
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He is a sick son of a bitch




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Discretesignals
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Dec 16, 2011, 9:26 PM

Post #15 of 18 (7255 views)
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In Reply To
He is a sick son of a bitch


Scotty Kilmer or Sid? LOL





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Hammer Time
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Dec 16, 2011, 9:28 PM

Post #16 of 18 (7248 views)
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Kilmer, of course. He posts some of the stupidest stuff I ever heard.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Sidom
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Dec 16, 2011, 9:29 PM

Post #17 of 18 (7245 views)
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Yea........some of his crap is just plain wrong...........That cigar thing, you could've easily spotted that leak with can of carb clean....The sad thing is, a lot of unknowning people probably put a lot of stock in those worthless video..... Man what would the neighbors think???? You're standing there with your hood open, blowing thru a piece of hose into your engine?????????

Martha!!!!! Come quick and look!!!!!!!!!! Scotty's doing it again!!!!!!!!!!!! I don't know what the hell he's doing but he's DOING IT!!!!!!! I think the damn crack head found a new way to get high!!!!!! That's it!!!!! WE'RE MOVIN!!!!!!!!!






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Discretesignals
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Dec 16, 2011, 9:40 PM

Post #18 of 18 (7237 views)
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I think his videos are more geared for the short cut/innovative/backyard ways of diagnosing vehicles using things around the house. They are entertaining to watch though. And to be quite honest there are some interesting tricks and he makes some valid points.

You wouldn't see me trying any of his methods on a customers vehicle though. Imagine customer watching you through the waiting room window as your puffing on a cigar blowing into their engine.

Snap on could market the cigar as a diagnostic tool. Snap on vacuum leak detector with built in flash light.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Dec 16, 2011, 9:41 PM)




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