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Old 03-19-2014, 10:40 AM   #1
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Help with CEL codes

Just recently I've started tackling codes that my car is throwing and...

They are:
- P0320
- P1131
- P1151
- P0171

I've already done my research on them and I've had a bunch of different things that could be causing them. I'm just posting to see if anyone has had these codes and what it took to fix them, I rather know 100% than go replacing o2s when it's an exhaust leak etc..

Its a 2003 full bolt on GT btw. Longtubes, offroad h and flows for the exhaust if that helps
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Old 03-19-2014, 11:58 AM   #2
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Codes P0171, P1131 and P1151 (and P0133 and P0153) are often associated with long tube headers, a result of the O2 sensors having been relocated further downstream from the exhaust ports. In closed loop operation the PCM constantly varies the AFR from lean to rich so as to maintain an average Lambda of 1.0:1 (an AFR of 14.68:1 for gasoline). It (the PCM) expects the O2 sensors to detect these changes within an amount of time defined in the tune, in the O2 Transport Delay table (O2TDt).

The fix is to increase the values (the values are the number of seconds in which the PCM expects the sensors to report the change in AFR) as shown below:



(In this table the highlighted values are the new numbers, increased by 12% to 15%)

You did not mention if you have a tune, if not you need one to correct this (and get the most from your mods) , if you do make sure the O2TDt table values have been increased, increase them a bit more if needed.

P0320 is misnamed in most sources (including the Ford shop manuals) as Ignition Engine Speed Input Circuit Malfunction. It actually indicates that two or more erratic Crankshaft Position (CKP) sensor pulses were detected by the PCM. It could be loose wiring/connector(s), arcing from the ignition secondary or use of a radio transmitter or other radio frequency device. More about P0320 here.

Quote:
Originally Posted by 96smoke View Post
Just recently I've started tackling codes that my car is throwing and...

They are:
- P0320
- P1131
- P1151
- P0171

I've already done my research on them and I've had a bunch of different things that could be causing them. I'm just posting to see if anyone has had these codes and what it took to fix them, I rather know 100% than go replacing o2s when it's an exhaust leak etc..

Its a 2003 full bolt on GT btw. Longtubes, offroad h and flows for the exhaust if that helps
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 03-19-2014, 12:48 PM   #3
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I'm running a strategy tune right now, I do have a BAMA tuner though
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Old 03-19-2014, 12:57 PM   #4
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Quote:
Originally Posted by 96smoke View Post
I'm running a strategy tune right now, I do have a BAMA tuner though
I have seen that nomenclature from BAMA before, however other than as a silly marketing buzzword I have no idea what they mean by "strategy" tune, all tunes are strategic in nature...

Were they aware you had the LTs when they created the tune? Ask them how much they increased the O2 Transport Delay table values, I have found 12% to 15% to work on most but sometimes it takes a 20% increase in the mid-range...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 03-19-2014, 01:08 PM   #5
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They didn't supply the tune for me though, I haven't paid the $150 for the tunes yet so I temporarily "strategy" tuned it.. All I did was turn the rear o2s off and switch it to 93 octane
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Old 03-19-2014, 02:48 PM   #6
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The other thing regarding the P0320 code is that I read it could somehow relate to the COPs not connecting fully? Oddly enough I had just installed new Accel COPs about 2-3 weeks ago.. And what it does I'll be cruising usually in 4th gear right under 2k at 42-45 mph and it'll buck and RPMs will drop and I have to gas it to keep it on... It'll do it then stop for a few miles then do it again but once it heats up, it never does it. Local mustang guys told me moisture could be getting in a COP? Or something like that..? Insight?
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Old 03-19-2014, 05:31 PM   #7
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Quote:
Originally Posted by 96smoke View Post
The other thing regarding the P0320 code is that I read it could somehow relate to the COPs not connecting fully? Oddly enough I had just installed new Accel COPs about 2-3 weeks ago.. And what it does I'll be cruising usually in 4th gear right under 2k at 42-45 mph and it'll buck and RPMs will drop and I have to gas it to keep it on... It'll do it then stop for a few miles then do it again but once it heats up, it never does it. Local mustang guys told me moisture could be getting in a COP? Or something like that..? Insight?
Not being tuned for the LTs will cause the AFR related codes, and as I said above bad connections and arcing in the ignition secondaries will cause P0320.

FWIW my experience with Accel COPs was that they suck, I got a set years ago and three failed within 3500 miles behaving just as you describe--heat related misfires and eventual complete failure. Here is more about my experiences with Accel COPs and COP testing...
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 03-20-2014, 04:08 PM   #8
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Had the chance today to take a look at everything. Went to take the Accel cops out, and they were extremely hard to get out.. The boots kept coming off and staying in the hole. The stock ones never had that issue.. So I'm debating whether or not to just take these out and pick these up off ebay.. http://bit.ly/1d2s0qA or find out what other options I have?

Replaced the crankshaft position sensor just because I had already bought it before asking you. Haven't had the issue occur yet but the car hasn't fully cooled down yet, tmrw morning will be the test
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