P0238 with regulator
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
I put in my spare (original) MAP sensor this morning. I still got a P0238 code on one hard acceleration. I am, however, experiencing better spooling and less smoke. I would have to say the MAP sensor did help in those respects. Still unsure of why the codes, as I have a MAP regulator, also. It limits the PCM to seeing ~22.2 psi, according to my Aeroforce Scangauge. My analog gauge reads ~1.5-2 psi less than the digital one. When I get a chance, I will run my AE and compare its reading to the others. Since I'm already at 1/2 tank, I'll check my mpgs on the next one for improvement.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Sorry if that seemed like a silly question. Rule 1 for me is start at the most basic and dig in from there. Did you do the KOEO on your pressures yet?
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
That's what I said. Boost gauge (connected at AIH delete plug) is always a little behind the Scangauge. I haven't monitored all those parameters yet. I have a larger turbine housing, so my EBP readings will be different than that of a stock setup when running.
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Posting Guru
Joined: Mar 2011
Posts: 1,037
Likes: 0
From: Florida
I put in my spare (original) MAP sensor this morning. I still got a P0238 code on one hard acceleration. I am, however, experiencing better spooling and less smoke. I would have to say the MAP sensor did help in those respects. Still unsure of why the codes, as I have a MAP regulator, also. It limits the PCM to seeing ~22.2 psi, according to my Aeroforce Scangauge. My analog gauge reads ~1.5-2 psi less than the digital one. When I get a chance, I will run my AE and compare its reading to the others. Since I'm already at 1/2 tank, I'll check my mpgs on the next one for improvement.
MAP= 14.6
EBP= 14.75
MGP= -0.11
Baro V= 4.74
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Posting Guru
Joined: Mar 2011
Posts: 1,037
Likes: 0
From: Florida
Bumping this up to see if anyone has any suggestions on what to try.
I could not track down another used MAP sensor to compare.
I could not track down another used MAP sensor to compare.
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Posting Guru
Joined: Mar 2011
Posts: 1,037
Likes: 0
From: Florida
No it won't. Closest SGII will do is the boost x-gauge which is just a formula to subtract a constant barometric pressure from MAP. With AE MGP was 0.11 KOEO.
Cargo Master
Joined: Mar 2006
Posts: 2,502
Likes: 2
From: Bend Oregon
Here are my ramblings....
If I was getting P0238 with OCR installed I would record MGP with AE and do my best to generated the P0238.
Once I tripped the P0238 I would review MGP data on the AE to verify the highest reading the PCM saw....if over 22 PSI I would contact the OCR manufacturer.
From riffraffs site: "We are the first to utilize a pre-set custom regulator that will allow your MAP Sensor to see up to 22psi before holding it there."
If the PCM never saw 22+PSI I would suspect either a PCM issue or a tune issue.
If I was getting P0238 with OCR installed I would record MGP with AE and do my best to generated the P0238.
Once I tripped the P0238 I would review MGP data on the AE to verify the highest reading the PCM saw....if over 22 PSI I would contact the OCR manufacturer.
From riffraffs site: "We are the first to utilize a pre-set custom regulator that will allow your MAP Sensor to see up to 22psi before holding it there."
If the PCM never saw 22+PSI I would suspect either a PCM issue or a tune issue.
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Posting Guru
Joined: Mar 2011
Posts: 1,037
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From: Florida
Did two highway onramp logs this evening, WOT after TCLU and reaching 4th. Both runs triggered P0238 (cleared in between) and logs show me letting off the pedal before pausing. Kinda looks like the MAP sensor is seeing >22 psi.
MGP and ICP:
MGP, ICP, MAP, EBP:
MGP and ICP:
MGP, ICP, MAP, EBP: