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Old 06-05-2010, 11:33 PM   #1
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Service Engine Soon light ><

Hey all!

New to this forum sucks my first post has to be about a problem!

Bought an '02 Mustang convertible about 2 months ago and the Service Engine soon light came on. Took it to autozone and received code p1131 Misfire on bank 1, Vacuum leak, Fuel injector problem, or excessive engine wear. Took it to a mechanic today and he figured it just needed a tune up so replaced the wires, plugs, fuel filter, oil & filter, air filter & put in some lucas. Light came back on after the reset.

I love the car and its my first Mustang and dont want to get rid of it. Any ideas what to do next? I just changed the oil so not really wanting to do the Seaform thing right now.. but will if i have too. Scared that is just excessive engine wear though and the seaform will kill it lol.
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Old 06-05-2010, 11:55 PM   #2
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Re: Service Engine Soon light ><

Go to a ford dealership and get the car hooked up to a computer/scan tool. They're gonna charge u a diagnostic fee. So ur gonna have to make peace with that. Diag fees r the cost to getting ur code read. Unless u or your friend has an sct excalibrator 2 and pull them urself.
From there once u pull the code....either the dealership or u can look it up on the internet will tell u what the code is.
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Old 06-06-2010, 12:01 AM   #3
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Re: Service Engine Soon light ><

Code from Autozone was P1131. They use different equipment at the dealership?
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Old 06-06-2010, 12:06 AM   #4
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Re: Service Engine Soon light ><

Receipt says "Defiition: Lack of bank 1 02 transitions - lean Explanation. ECM detected bank 1 02 at its lean limit. Probable cause:

Misfire on bank 1 (My SES light doesn't blink.. it blinks when it actually misfires, right?)
Vacuum leak affecting only bank 1 (I have been getting some bucking at stop lights)
Fuel injector problem bank 1
Engine Mechanical condition it does have 115000
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Old 06-06-2010, 12:28 AM   #5
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Re: Service Engine Soon light ><

Quote:
Originally Posted by rinfield2004 View Post
Go to a ford dealership and get the car hooked up to a computer/scan tool. They're gonna charge u a diagnostic fee. So ur gonna have to make peace with that. Diag fees r the cost to getting ur code read. Unless u or your friend has an sct excalibrator 2 and pull them urself.
From there once u pull the code....either the dealership or u can look it up on the internet will tell u what the code is.
This is a terrible idea. First, the codes you're referring to are freely available at AutoZone. Second, never trust the dealership or AutoZone guy to tell you what it means and be accurate.

To the OP, does the car hold an idle? If so, start it up and check for vac leaks. My GT had a couple that were somewhat hidden... took care of them and it ran a lot better and no codes!
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Old 06-06-2010, 12:32 AM   #6
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Re: Service Engine Soon light ><

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This is a terrible idea. First, the codes you're referring to are freely available at AutoZone. Second, never trust the dealership or AutoZone guy to tell you what it means and be accurate.

To the OP, does the car hold an idle? If so, start it up and check for vac leaks. My GT had a couple that were somewhat hidden... took care of them and it ran a lot better and no codes!
It doesn't stall..
The RPMs start kinda high(not sure where) drop down to 2k(?) then sometimes shoot back up again. I was looking & listening for a leak but couldnt locate anything. Is there a better way to find it?
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Old 06-06-2010, 12:56 AM   #7
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Re: Service Engine Soon light ><

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It doesn't stall..
The RPMs start kinda high(not sure where) drop down to 2k(?) then sometimes shoot back up again. I was looking & listening for a leak but couldnt locate anything. Is there a better way to find it?
you can spray carb cleaner around "culprit" areas and see if the idle changes. (it'll make the RPMs go up). It might not hurt to clean the MAF and IAC while you're in there, assuming that may not have been done lately. (electrical contact cleaner is a must for MAF)

I found my tricky vac leaks by very slowly running my hands around the vac lines.
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Old 06-06-2010, 11:22 AM   #8
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Re: Service Engine Soon light ><

The P1131 code is an indication of the car running lean, in case you haven't figured that already out.

First make sure that the you took the steps to make sure the car "shouldn't" be running that way anymore. Next ask yourself "Could it be another problem?" Did the mechanic change all spark plugs, wires, etc? If the CEL came back on get it scanned again, check the code to see if it's the same one, have them clear the code and see if it returns again. If there was a misfire, sometimes codes will only report one at a time (I've seen/heard). You may have 2 or 3 misfires for instance. It could also be the car just needs to run a little longer to reset itself and correct the A/F ratio.

</my opinion anyway>
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Old 06-07-2010, 08:37 AM   #9
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Re: Service Engine Soon light ><

clean the maf sensor with some electronic no residue on contact cleaner really good this can get gunked up and cause idle issues and a/f issues.
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Old 07-22-2015, 09:50 PM   #10
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Read voltage coming off oxygen sensor,very possible your problem
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Old 07-23-2015, 07:21 AM   #11
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If you can access a scanner to read live
data, monitor the upstream o2 switching. Disconnect the
vacuum booster line to create a lean condition voltage should
go to zero. Reconnect. Spray carb cleaner in the air tube. voltage
should spike rich .9v if this happens o2 working correct. If not replace o2 sensor. Also, try this: Try clearing the code and starting it. If the code pops back up then let the engine reach full operating temp. Then shut it off,erase the code, and start it again while the engine is hot. If you do not get a code after this last step then you probably need a new O2 sensor.
The O2 sensor has a heater element in it so it can get up to operating temp as fast as possible. If this heating element is not working (which is the most common problem with O2 sensors) then you will get a fluctuation between lean and rich until the sensor gets up to operating temp. The code could also mean an injector is malfunctioning. Get a good quality injector cleaner and run it thru your system. This may help too.
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