maf sensor
11-01-2009, 10:22 AM
#2
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
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Provide additional info.
You need a "signature" showing basic info about your car - year, model, engine, tranny and any major mods. That helps people answer your questions accurately.
What are the EXACT numerical codes you are getting? In OBD-I there is only a single code for the MAF sensor. In OBD-II, there are multiple codes. That's why we need basic info about the car, and the EXACT codes.
You need a "signature" showing basic info about your car - year, model, engine, tranny and any major mods. That helps people answer your questions accurately.
What are the EXACT numerical codes you are getting? In OBD-I there is only a single code for the MAF sensor. In OBD-II, there are multiple codes. That's why we need basic info about the car, and the EXACT codes.
11-01-2009, 02:34 PM
#4
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
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P0102 sets when the MAF sensor output signal reading is less than 1,000Hz, which is outside the minimum acceptable signal level.
P1371 sets when the PCM can not find the low resolution cam position signal from the Optispark. If the engine is running, its a stored code. If its an active code, it shuts down the fuel system and the engine will not run.
The two codes are not related.
P0400 indicates a problem with the EGR recirculation. Is your EGR system still installed and operating.
P0153 sets when the PCM detects slow swithcing (rich/lean/rich) on the passenger side pre-cat O2 sensor.
Describe the problems with the engine, in detail. How does it start, how does it idle, how does it perform at wide open throttle (WOT)?
P1371 sets when the PCM can not find the low resolution cam position signal from the Optispark. If the engine is running, its a stored code. If its an active code, it shuts down the fuel system and the engine will not run.
The two codes are not related.
P0400 indicates a problem with the EGR recirculation. Is your EGR system still installed and operating.
P0153 sets when the PCM detects slow swithcing (rich/lean/rich) on the passenger side pre-cat O2 sensor.
Describe the problems with the engine, in detail. How does it start, how does it idle, how does it perform at wide open throttle (WOT)?
Last edited by Injuneer; 11-01-2009 at 02:36 PM.
11-02-2009, 05:23 AM
#6
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
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Did you check the rubber elbow that connects the MAF to the throttle body? Is it torn, or is the bottom lip folded under and not on the throttle body? Sounds like the engine is getting air that is bypassing the MAF sensor.
In addition, you've got to fix the problem with the EGR and the passenger side O2 sensor.
You also have to clear the codes (pull PCM BAT fuse for 30 seconds, with key "off"), and see how quickly the P1371 code comes back, which would indicate a problem with the Opti, or the Opti wire harness and connectors.
You never answered my question - is your EGR system intact?
Seems like you want to type as few words as possible, and that's not going to help you get your problem solved.
In addition, you've got to fix the problem with the EGR and the passenger side O2 sensor.
You also have to clear the codes (pull PCM BAT fuse for 30 seconds, with key "off"), and see how quickly the P1371 code comes back, which would indicate a problem with the Opti, or the Opti wire harness and connectors.
You never answered my question - is your EGR system intact?
Seems like you want to type as few words as possible, and that's not going to help you get your problem solved.
11-02-2009, 05:16 PM
#9
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
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P0372 is for loss of the high resolution pulse signal from the Opti. Appears you may have a faulty Opti optical module, or the short Opti wiring harness, or the connectors on either end of it are corroded, loose or damaged.
11-02-2009, 11:34 PM
#11
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
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The optical module is in the Opti case. The harness runs from the gray connector on the bracket on the passenger side of the intake manifold to the electrical connector on the Opti. That's what powers the Opti electronics, and sends the Opti cam position signals to the PCM.
From Shoebox:
http://shbox.com/1/evap_sol.jpg
From Shoebox:
http://shbox.com/1/evap_sol.jpg
11-03-2009, 09:07 PM
#13
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Join Date: Oct 2002
Location: Detroit, MI
Posts: 1,129
Weird, I went through the same EXACT problem, from the P0372 to the car shutting off after it went into closed loop. It would run in closed loop sometimes, check engine light on, RICH RICH RICH. Went through O2s like crazy (autozone stopped taking them back)! Anyways, turns out my MAF was done. I took it out one day and looked at it from the front...looked fine, flipped it around and the backs of the resistors were burn off...bought an aftermarket MAF...granatelli I think, and she has been fine ever since.
Hope that helps.
Charlie
Hope that helps.
Charlie
11-03-2009, 10:23 PM
#14
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Join Date: Nov 1998
Location: Hell was full so they sent me to NJ
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I was going to recommend EFIConnection for a cheap replacement Opti harness, but a quick check of their webiste produced this ominous message:
http://www.eficonnection.com/eficonnection/default.aspx
http://www.eficonnection.com/eficonnection/default.aspx