codes after vararam install
Instructor
Joined: Feb 2004
Posts: 139
Likes: 0
From: ON
Originally Posted by GVZO6
has anyone had p0171 p0174 fuel trim lean come up after the install ,thanks for any help George
Melting Slicks
Joined: Dec 2004
Posts: 2,482
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From: *MIDDLETOWN NY* "I thought I was an OLD-GUY, till I met Charlie"
Originally Posted by GVZO6
has anyone had p0171 p0174 fuel trim lean come up after the install ,thanks for any help George
Collections Hold
Joined: May 2003
Posts: 3,520
Likes: 2
From: Tacoma WA
This is a problem for some. You can clear codes and keep driving, as it takes quite a few miles for PCM to relearn. However, you really need to get you LTFT in line and recalibrate your MAF for optimum performance. Computer will only go so far on it's own. Mine never threw codes but LTFT were in the 15/17 positive range (should be around 0), meaning the Vararam was causing a lean condition and ltft's were compensating, it ran fine, but was not really correct, for best power.
Racer
Joined: Jun 2005
Posts: 393
Likes: 0
Vararam and codes
I tripped a few codes when I first installed my Vararam. I reset the code the first time. When it tripped again I called Vararam. They told me that some Vettes do not have Bosh fuel injectors and the engine is getting to much air for the injectors that were installed. They recommended that I change the filter to one that is more restrictive. They sell them on their website. Before I had a chance to order the filter, I cleared the code for the second time and had no problems since.
Intermediate
Joined: May 2005
Posts: 34
Likes: 0
Wow ... thats a load of crap! Add a restriction to fix a fuel management problem. I can't beleieve that vararam folks would say something that was so blatanty of base. Get that car over to a quafilfies shop that that will observe O2 switch rates, fuel trims and the like before you go diagnosing around a problem.
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Racer
Joined: Sep 2004
Posts: 383
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St. Jude Contributor '04
Originally Posted by GVZO6
has anyone had p0171 p0174 fuel trim lean come up after the install ,thanks for any help George
Ever since I installed VaraRam CAI, I've had intermitten SES light come on. Got it read and the code is 0171 (Fuel Trim too lean bank 1). It's weird that SES comes on for few days and goes away for several days and comes back on. I don't believe this code effects performance of my Vette, at least I haven't noticed it.
I don't know if this code is related to VaraRam CAI or not. Possible improper install???
Strange thing is, before the VaraRam, I was very rich, I can't imagine VaraRam leaning out that much to throw P0171 code.
Here is a image of AFR before VaraRam, I haven't done AFR check since VaraRam install.
Collections Hold
Joined: May 2003
Posts: 3,520
Likes: 2
From: Tacoma WA
Originally Posted by AOC
Wow, samething is happening to me.
Ever since I installed VaraRam CAI, I've had intermitten SES light come on. Got it read and the code is 0171 (Fuel Trim too lean bank 1). It's weird that SES comes on for few days and goes away for several days and comes back on. I don't believe this code effects performance of my Vette, at least I haven't noticed it.
I don't know if this code is related to VaraRam CAI or not. Possible improper install???
Strange thing is, before the VaraRam, I was very rich, I can't imagine VaraRam leaning out that much to throw P0171 code.
Here is a image of AFR before VaraRam, I haven't done AFR check since VaraRam install.
Ever since I installed VaraRam CAI, I've had intermitten SES light come on. Got it read and the code is 0171 (Fuel Trim too lean bank 1). It's weird that SES comes on for few days and goes away for several days and comes back on. I don't believe this code effects performance of my Vette, at least I haven't noticed it.
I don't know if this code is related to VaraRam CAI or not. Possible improper install???
Strange thing is, before the VaraRam, I was very rich, I can't imagine VaraRam leaning out that much to throw P0171 code.
Here is a image of AFR before VaraRam, I haven't done AFR check since VaraRam install.
Collections Hold
Joined: May 2003
Posts: 3,520
Likes: 2
From: Tacoma WA
If the PCM doesn't relearn into acceptable parameters, the only way I know of to do it right is a tuner program. You will need to relearn LTFT (long term fuel trims) then recalibrate MAF frequencies to match new ltft's and you get optimum gains as a benifit of proper tune. Some say add a MAF screen or higher restriction filter, but what's the use of putting it on if your going to choke it back down. It can take a couple hundred miles for some cars to relearn.
Instructor
Joined: Aug 2003
Posts: 205
Likes: 0
From: Birmingham AL
So Robert your saying you need to have the car tuned after the install of a Vararam? I know nothing of LTFT and I am not even sure I have a tuner close to me.....but I am getting a Vararam soon.
Collections Hold
Joined: May 2003
Posts: 3,520
Likes: 2
From: Tacoma WA
No you don't have to, however to see optimum gains it should be recalibrated. If you throw codes that means your on the edge of the +25%/-25% area that the computer can compensate. Codes may go away with time, or like my set-up and many others you'll never set a code and it'll run fine with gains. When I retuned mine some of my ltft Long Term Fuel Trims (chart rpm x load) were up to +17% (meaning computer was correcting for a lean condition) acceptable yes/maybe, optimum no. It's your call.
Racer
Joined: Sep 2004
Posts: 383
Likes: 0
St. Jude Contributor '04
I have not seen P0171/P0174 in about 4 days now, hopefully ECU has re-learned itself.
Now, I am about to install TPIS LT headers, will it lean it out even more or would it richen up? I know some folks get leaned out with LT headers and others get richened.
Now, I am about to install TPIS LT headers, will it lean it out even more or would it richen up? I know some folks get leaned out with LT headers and others get richened.
