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Discussion Starter · #1 ·
...at Schucks and they gave me a print out which read:

Trouble Codes:
-23 - Throttle Position Sensor is out of range

-67 - A/C on during KOEO test or neutral drive switch is open or manual lever position sensoris out of range

-41 - No Exhaust Gas Oxygen switching detected - always indicating lean

-66 - MassAir Flow / Vane Air Flow sensor too low - grounded or transmission oil temp sensor too low

Pending Codes:
No codes reported

Freeze Codes:
No codes reported

Just so every one knows I have a '91 Pony with a 2002 SPI under the hood. The car runs great besides the fact that it dies at idle with NO indication that it is going to do so. Other than that the car is a little beast even w/o the spi hooked up. Any help would be appreciated, thanks.
 

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Have you tried swapping a different MAF, o2 or TPS yet? Code 67 could be from not having the car in neutral when they pulled the codes.
 

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Discussion Starter · #3 ·
I've got a perfactly good maf from Kyle's '93 LX and have not done an O2 sensor. The TPS is from the 2002 motor so I hope that it is good. I could change it out 'cause I have a few spares laying around. The car is a stick and it was in neutral when the codes were pulled. I do plan on changing the O2 sensor out when I have the money. I also have a maf coming from a 2001 that I will be using.
 

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I must have missed this one somehow. One has to be on here at least once a day to not miss a post (I just look at the most recent 20).

The Code number is important, but you must also specify if the code occurred during the KOEO (key on engine off) test, the R (engine running) test or whether it is part of the C (continuous memory) test. The same code number can occur during more than one of the tests and can mean different things, depending on the test during which it occurred. I'll take a stab here anyway. Maybe it's just me - I'm not familiar with the terms Freeze Codes (maybe equivalent to a C test code?) or Pending Codes (maybe equivalent to a KOEO test code?).

Code 41: With the text provided, this is a C test code, not the R test code. It means the O2 sensor is simply not responding to changes in exhaust O2 content (no change for 15 seconds or more), as it should. You didn't get a Code 41 (R), so your computer knows you have an exhaust O2 sensor. It's alive, but it's not working and is having at least some negative effect on your fuel control. I would have expected a CEL code with this one. When the exhaust O2 sensor gets really bad, your computer will flood your engine with fuel to protect your engine. It may be contributing to your idle problem, but I doubt it at this point. Replace it before this gives you performance problems.

Code 67: This code could be a C test, a KOEO test code or a R test code. If it was an R test code, the A/C was inadvertently left on for the test. I'd like to think your tech wouldn't have made that mistake. Does the Tracer even have A/C :lol: ? If this code occurred during the C or KOEO test, it's the neutral/drive switch circuit has failed open. It's either the switch or the wiring. It's a major PITA to replace the switch. Don't worry about it.

Code 26: Could have been a KOEO test code or an R test code. I'm sure this was an R test code result for your situation. The MAF is not spitting out an acceptable range voltage reading (0.2-1.5 V) when the engine is running. You claim the MAF is fine (I'm skeptical). Then the wiring or connection is your problem. Disconnect your MAF and reconnect it (make sure the connector snaps into place). This is the main cause of your idle problem.

Code 66: This is a C test code. Your MAF sensor showed an unacceptably low response (<0.4 V) at least once during the last 80 warm-up cycles. Either the resistance across the filaments it too high (ie dirty or damaged) or your wiring is again suspect.

If you have a spare, functional MAF lying around, I'd install it, have the codes reset, run it for a while and then get your codes checked again.
 

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Discussion Starter · #6 ·
Highanddry, thankyou for your responce! That has to be one of the few posts thatI have read where you didn't rank on someone while providing information. :lol:

I've just replaced the maf with one form a 2001 and am still having ideling problems. Kyle tells me that I will need to train my computer to run the 2002 SPI because it isn't allowing it enough air at idle. I am going to install a newer O2 sensor(the one that came with the ''02 SPI) and then reset my codes so that I can see what the new codes read.

Thanks again!
 

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Well keep us posted. I think the MAF low voltage problem points to a wiring/connector issue. It could be a bad/corroded pin where the MAF connects to your ECU.

Sometimes during code questions, I actually have to think a bit. That takes away from my instinctive response to verbally abuse the feeble-minded dork who asked the question, you stupid POS. :lol:

My irreverence is gonna get me killed.
 

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what ECU are you running? you state teh 93 MAF but is the ECU still a 91? if so that may be alot of your issues. just have done the swap as-sisting in mikes (91sleeper) car he said that you also need the new ECU. also there should be nothing related to the A/C if its not even hooked up. also run a ground from your MAF to your battery ground like a ground wire kit of to the main enginge ground. that may help the stalling out at idle.

NEUMAN
 

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Discussion Starter · #9 ·
neuspeedescort said:
what ECU are you running? you state teh 93 MAF but is the ECU still a 91? if so that may be alot of your issues. just have done the swap as-sisting in mikes (91sleeper) car he said that you also need the new ECU. also there should be nothing related to the A/C if its not even hooked up. also run a ground from your MAF to your battery ground like a ground wire kit of to the main enginge ground. that may help the stalling out at idle.

NEUMAN
I'm still using a 91 ECU. I might try the grounding idea that you spoke of. Do I just ground the MAF housing or one of the four wires, I'm sure you're talking about one of the wires 'cause the housing is aluminium, I think.

Also, I just hooked up a Air/Fuel ratio gauge (Autometer) and I hooked it up the way that Kyle said that he thought his was hooked up and all it reads is RICH. It doesn't move at all. No throtle or full throttle or under a load, even when it stalls out it still reads rich. I think that I may have it hooked up wrong. It has three wires coming out of the back of it BLACK, RED, and PURPLE. I have the black one grounded, the red one tapped into 12 volts and the purple one is connected to a green wire with a blue stripe that leads to the O2 sensor plug.
 

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I had a lot of problems when I tried running a 93+ larger MAF on my 91 ECU. I snagged a 94 ECU and MAF from pull a part and it runs fine. My o2 sensor has 4 wires IIRC. 2 white and 2 other ones. I am pretty sure the black one is the signal. According to the Chiltons (crappy lol) there should be a orange/black wire and dark green/dark blue wire that both go to the ECU so I figure one of them is the signal. The black/dark green is ground and orange/dark blue should be fused power. All those colors are on the harness side, not the sensor side. Hopefully that might help a little.
 

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Well I can dispell the ECU myth. I'm running a 95 MAF on my 93 ECU running a 2002 SPI and all is well. Wow that's a nice mix of stuff. LOL.

Anyways, the only codes I have are related to running a MAF that's setup for a motor that has 15lb injectors on a motor running 19lb'ers. Code 179 (Memory Code) "fuel system at lean adaptive limit at part throttle system rich bank 1." --> Points to MAF/ECU designed for smaller injectors. I'll change it out eventually. And the other code is 121 (KOEO and KOER) "closed throttle voltage higher or lower than expected or not consistent with MAF sensor. --> Points to bad TPS or MAF

Also on a side note here is what the Pending and Freeze for codes mean.

Pending: A potential problem is seen by the ECU but did not meet all criteria to warrant setting a trouble code. ECU will continue to monitor. If seen again will trip a trouble code. If not seen after 40 warm up cycles it will be deleted.

Freeze/History: A problem or potential problem seen by the ECU that met all criteria to warrent setting a trouble code no longer appears to be present. If not seen again after 40 warm up cycles it will be deleted.
 
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