2002 mustang gt help throwing a code !!! - Mustang Evolution

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Old 02-09-2015, 07:56 PM   #1
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2002 mustang gt help throwing a code !!!

Ok so after installing a new intake manifold and re-assembling everything I drove the car for about two days and it threw a code "p1131" anybody know what this could meen ? Also while putting everything back together on my cold air intake there is two ports where hose go over I be leave its a part of the vac lines ? Well on one I snapped but put back together with silicone .. I lifted the hood today and it's still intact but it is loose ... Could this be the reason for the code ? Any help would be much appreciated thanks guys .


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Old 02-09-2015, 08:01 PM   #2
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2002 mustang gt help throwing a code !!!

P1131 means it's running lean on bank 1. It's triggered by your O2 sensor on your catalytic converter.


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Old 02-09-2015, 08:20 PM   #3
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So should replacing with a new O2 sensor fix the problem ?


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Old 02-09-2015, 08:23 PM   #4
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Is the car retuned after the CAI was intstalled?


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Old 02-09-2015, 08:31 PM   #5
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Well it's the same cold air intake I just took it off to put my intake manifold on ?? Would I need a tune after that ??


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Old 02-09-2015, 08:32 PM   #6
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Quote:
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Is the car retuned after the CAI was intstalled?


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Sorry reread your OP misread it the first time just give me a sec I'll tell you the possible causes (there's a couple).


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Old 02-09-2015, 08:35 PM   #7
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Ok thanks


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Old 02-09-2015, 08:36 PM   #8
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Get some starting fluid, crank the car, spray the repaired broke line, listen for an idle change. If it changes you have a vacuum leak.

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Old 02-09-2015, 08:37 PM   #9
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Ok, causes can be this...
There's a vacuum leak on the bank 1 side of the engine.
Fuel injector issue on the bank 1 side.
Misfire on bank 1 side.
Sensor could be going out.
Now from your post I'd probably replace the broken vac line and see if it fixes it.


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Old 02-09-2015, 08:38 PM   #10
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Spray around the intake mani also. Could be as simple as re torquing all the bolts fixing a leak.


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Old 02-09-2015, 08:39 PM   #11
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The hose isn't broke its the plastic port with threads that goes into the cai but when I looked at it today the silicon came undone and it definetly is a wider crack where it's coming apart so there can be a leak there ? I'm sure I can go to the auto parts and get a new plastic port and scree it in right ?


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Old 02-09-2015, 08:41 PM   #12
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That could be the problem, and there's a possibility if they don't have it then go to the ford dealer.


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Old 02-09-2015, 08:45 PM   #13
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Okay yeah I don't be leave there isn't any misfire the mustang idles right under 1000 rpm and its strong . What does bank 1 meen ? I put new plugs and intake manifold in and it runs strong so I don't be leave its nothing to do with that ? Now when I put a new port in do j unplug the negative terminal for a few minutes to reset it ?


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Old 02-09-2015, 08:48 PM   #14
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Bank 1 is the side of the engine where cylinder 1 is located. Bank 2 is the other side. Cylinder 1 isn't always located on the same side on every car, so they refer it to bank 1


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---------- Post added at 02:48 AM ---------- Previous post was at 02:47 AM ----------

Take it to a parts store, they can reset the code after the part is installed.


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Old 02-09-2015, 08:52 PM   #15
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So auto zone can reset it for me ??


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---------- Post added at 08:52 PM ---------- Previous post was at 08:51 PM ----------

If this isn't the problem should I replace the sensor next ??


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Old 02-09-2015, 08:56 PM   #16
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Quote:
Originally Posted by smsstang View Post
So auto zone can reset it for me ??


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---------- Post added at 08:52 PM ---------- Previous post was at 08:51 PM ----------

If this isn't the problem should I replace the sensor next ??


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If that doesn't fix it, then get some brake clean and spray it along the intake gasket, if it idles rough and/or drops rpms then the intake has a leak. Possible fixes are re torque the intake bolts or the intake was installed improperly.


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Old 02-09-2015, 08:56 PM   #17
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You have a vacuum leak. At least that's what it sounds like to me. At least do the starting fluid test and eliminate the possibility. Spray around the intake mani and ant other vacuum line.
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Old 02-09-2015, 08:59 PM   #18
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Don't replace the sensor first.
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Old 02-09-2015, 09:02 PM   #19
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You can try spraying the broken vacuum port with brake clean it should have the same reaction...


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Old 02-09-2015, 09:19 PM   #20
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When I spray it am I looking for the idle to rise or bog down ??


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---------- Post added at 09:19 PM ---------- Previous post was at 09:18 PM ----------

Also when I spray the intake where do I spray at ?? The crease on the side I'm not sure ?


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Old 02-09-2015, 09:22 PM   #21
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Where the intake manifold connects to the head.


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---------- Post added at 03:22 AM ---------- Previous post was at 03:22 AM ----------

And drops rpm...


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Old 02-10-2015, 02:53 PM   #22
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It's good you posted in here but you can Google your codes.

I hope you have found out the problem and are on your way to having it solved.
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