P0175 2007

[Mark Price 2]

My father took his (new to him 1yr ago) 07(4.0) ST to Firestone to get the tires rotated. They talked him into changing the fuel filter. (even though I just changed it for him last May:banghead Also, talked him into "fuel system cleaning". He barely remembered the guy mentioning the cleaning. He said he went right into talking discounts..blah,blah..he is upset that he let this smooth talker get him. Anyway, he brought it over to me today with an engine code(P0175).(code came on as soon as he left firestone) I cleared the code, checked the fuel filter to be sure they installed a new one.(looked new) I just recently cleaned his maf and TB, and new air filter. I am going to assume they hooked up one of those cleaner machines to clean the fuel injectors.(I think it was like $45 for cleaner and $80 labor) Could this have caused the "rich" condition? If it comes back on I'm thinking of disconnecting the battery so the comp. can "relearn". Does this sound right? The vehicle is and has been mechanically sound.(all new fluids/plus/wires last year) Of coarse he will probably take it back in if the code reappears. I just dont want them giving him some bs though. Oh, also they did a generic inspection. The report had some scribbles next to spark plugs. Do you all think they actually took them out? Maybe they didnt put them back right? Engine is running smooth though. IDK. This is very frustrating though! I cant stand it when people take advantage of my elderly dad. Also $20 for fuel filter(fair) and another 80 for labor(wtf) I guess its a fixed labor charge as some are harder then others. Whatever. So $200 something and all he wanted to do was get his "free" tire rotation since he bought them there.:angry:

 

[Mark Price 2]

he thought he needed the filter and cleaning because he's only been getting 16.5mpg. Silly Father. :bwahaha:He's used to driving Accords for the past 20 years

 

[Vic Sorlie]

18-19 mpg (city) is about all you can expect from the 4.0L V6. I'm getting same from my 4.6L V8 with AMSOIL synthetics in engine and driveline.

 

[Mark Price 2]

I understand this code can mean a lot of different issues. So any guesses are appreciated. But given there were no issues before the fuel cleaning service. I'm wondering if the comp. controls the amount of fuel given to the injectors. So if the injectors are now cleaner, the comp still lets out the amount it was giving to the "clogged" injectors. Now giving it more fuel, so now running rich? So disconnecting the battery, the comp learns to send the appropriate amt? Does this sound somewhat sensible? or am I completely off in my thinking. I just cant think of what they did to cause this code to come up.

 

[Gavin Allan]

You can try to diagnose it with what you have, or you can use a scanner to clear all the codes and see what comes back, and start diagnosis from there.



You need a tech who has a scanner and service manual and who knows how to diagnose codes. Parts changing can get expensive pretty fast, and still not fix the problem. I doubt if anyone here can disagnose it over the world wide web very well.

 

[Mark Price 2]

Agreed. Thanks Gavin.

I thought maybe someone may have had experience using one of those industrial fuel injector cleaning machines and had come across this code popping up after using it. I'll post after further diagnosis/info.

 

[Gavin Allan]

Maybe L1tech will weigh in soon.

 

[scott degroot]

A p0175 is bank 2 rich, but I think you knew that already. It is not unusual for this code to be set while doing the service or immediately after the service, after all we are taking the pcms ability to control fuel away from it by using our own fuel at our pressure. The vehicle should have been driven for a few miles and then left to idle for a period of time before it was returned to your father, this would have assured that the code didn't occur and also verified that the system was ok.



As for injector cleaning or engine decarbing goes save your money, it's normally not required but the profit margin for such services is so high that shop owners and uneducated technicians alike can't resist.

 

[Mark Price 2]

:supercool: Thank you! That makes perfect sence. I'll pass the info on to my father so he doesn't worry. CEL hasn't returned. I'm thinking the "at our pressure" maybe key here if the pressure is set to high while injecting the cleaner. As in a bit higher than normal fuel pressure. I guess they just use a certain pressure setting(maybe a higher one to speed up the process) as it would be a pain or not nessesary to look up each vehicles normal operating fuel pressure. Anywho, thanks for putting my mind at ease. It sure would be nice to have one of those live data scanners and the knowledge needed to use it of coarse. Thanks again guys:haveabeer:

 

[scott degroot]

IF I feel the need to do this type of service I always run higher than system pressure when doing so as it helps to clear deposits in the injector adn also at the tip of the injector