Codes and PCM
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
It only has a "simple" MAF 4-wire sensor. No BARO function on this one. There are other engines that do have BARO and/or IAT built into the MAF sensor assembly but not on this one.
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4wd Low
Joined: Feb 2022
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I unplugged the battery and let it sit for half an hour then went for a short drive. Now I'm getting p1131 and p1151. I also noticed that it has O2 sensor spacers on the upper O2 sensors. Would this contribute to the codes I'm having?
it's idling better after the MAF was replaced.
it's idling better after the MAF was replaced.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
Are you sure those spacers are on the UPSTREAM sensors (not the downstream ones)? If so, that needs to be corrected as the upstream sensors MUST be directly in the exhaust stream for them to work properly. Who the heck puts spacers on the upstream sensors?
Is this a recently acquired truck or what?
Is this a recently acquired truck or what?
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4wd Low
Joined: Feb 2022
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They are on the first O2 sensors (I can see them from the engine bay). And yeah. I bought it about a year ago and life took over. I put probably 100 miles on it since I owned it.
I'll take them out tomorrow and see if it fixes it. I'm hoping this is all it is. My 97 f150 has the head gasket oil leak and it's dripping on the starter and blowing onto the exhaust and smokes.
I'll take them out tomorrow and see if it fixes it. I'm hoping this is all it is. My 97 f150 has the head gasket oil leak and it's dripping on the starter and blowing onto the exhaust and smokes.
Fleet Mechanic
Joined: Jul 2019
Posts: 1,307
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I unplugged the battery and let it sit for half an hour then went for a short drive. Now I'm getting p1131 and p1151. I also noticed that it has O2 sensor spacers on the upper O2 sensors. Would this contribute to the codes I'm having?
it's idling better after the MAF was replaced.
it's idling better after the MAF was replaced.
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Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,079
From: St Louis
My general rule is to fix the obvious stuff first and then re-evaluate.
The disclosure of the O2 spacers on the upstream sensors is a glaringly obvious problem. In such a position, they cannot do their job of accurately measuring oxygen content of the exhaust stream and will cause mixture and response problems.
The disclosure of the O2 spacers on the upstream sensors is a glaringly obvious problem. In such a position, they cannot do their job of accurately measuring oxygen content of the exhaust stream and will cause mixture and response problems.
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4wd Low
Joined: Feb 2022
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Hotshot
Joined: Jul 2020
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From: Near Salt Lake City
Like to see you clear the codes with a scan tool and then retest
The system has to relearn idle speed and a few more parameters each time the KAM is interrupted
So when it dies it can set a rash of new or other codes
The 1131 and 1151 may be solved after you removed the O2 sensor spacers
But codes could persist for a few cycles
Means clear codes and retest a few times
The system has to relearn idle speed and a few more parameters each time the KAM is interrupted
So when it dies it can set a rash of new or other codes
The 1131 and 1151 may be solved after you removed the O2 sensor spacers
But codes could persist for a few cycles
Means clear codes and retest a few times