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Author
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Topic: KOER Codes 21, 42, 41, 91
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mastercudaz
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Member # 7486
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posted
 
 
So I bought a code scanner last night and ran a diagnostic with the car off and then with it on.
Off I got a code about a sending signal for the fuel pump which I have read that can be a phantom code. But...
with the car running I got the following codes, in this order 21, 42, 91, 41.
The book says 21 is a cooling issue, which could be because I didnt warm it up enough. The next codes 42, 91, 41 are all related to the HEGO or H02S. One of the codes says too lean and the next says too rich.
Any experience with this?
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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vpr_klr
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Member # 3353
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posted
all stock 5.0?
miles?
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Project crustang has begun
14 mustangs and counting...
Posts: 893 | From: Livermore | Registered: Oct 2003
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mastercudaz
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Member # 7486
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posted
sorry...not stock
gt40 iron heads
gt40 intake
e cam
24lb injectors
70mm tb
maf 24lb sampling tube
no adjustable fuel regulator yet, waiting on money to buy a kit
car is not idling well, goes up and down when cold. once warmed it will idle low and rough, and has stalled before
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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92stangLX
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Member # 3252
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posted
quote:
Originally posted by mastercudaz:
So I bought a code scanner last night and ran a diagnostic with the car off and then with it on.
Off I got a code about a sending signal for the fuel pump which I have read that can be a phantom code. But...
with the car running I got the following codes, in this order 21, 42, 91, 41.
The book says 21 is a cooling issue, which could be because I didnt warm it up enough. The next codes 42, 91, 41 are all related to the HEGO or H02S. One of the codes says too lean and the next says too rich.
Any experience with this?
21 Engine Coolant Temperature (ECT) sensor out of range
41 (R) System lean
(M) System was lean for 15 seconds or more (no HO2S switching)
42 (R) System rich
(M) System was rich for 15 seconds or more (no HO2S switching)
91 (R, M) System running lean
Transmission SS 1 circuit/solenoid problem
Code 21 sounds like a bad ECT sensor. The other codes could be bad O2 sensors.
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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92stangLX
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Member # 3252
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posted
quote:
Originally posted by mastercudaz:
sorry...not stock
gt40 iron heads
gt40 intake
e cam
24lb injectors
70mm tb
maf 24lb sampling tube
no adjustable fuel regulator yet, waiting on money to buy a kit
car is not idling well, goes up and down when cold. once warmed it will idle low and rough, and has stalled before
Once you get your codes sorted out I would install a AJFPR, a fuel pressure gauge, and dial in the fuel pressure. Also, check for vaccum leaks and check the idle itself.
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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mastercudaz
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Member # 7486
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posted
thanks, when you mention vacuum leak, I hear air but I cannot seem to find anything leaking. It sounds like its coming from the intake, not sure about upper or lower. Maybe a gasket?
Could a vacuum leak cause this much of a headache?
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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SmokinLX
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Member # 1684
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posted
quote:
Originally posted by mastercudaz:
thanks, when you mention vacuum leak, I hear air but I cannot seem to find anything leaking. It sounds like its coming from the intake, not sure about upper or lower. Maybe a gasket?
Could a vacuum leak cause this much of a headache?
Get a can of carb cleaner or starting fluid and spray around the intake and vaccum lines till You find the leak and repair it ![[patriot]](graemlins/patriot.gif) .
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Dont claim power if ya cant mile per hour. 10 second AOD
Posts: 4388 | From: East Bay | Registered: Aug 2002
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mastercudaz
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Member # 7486
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posted
okay, so I took off the upper intake and I found a hose off of the underside of the intake that was not hooked up. When I run the car and cover it, the idle seems to even out a little. After feeling around to where it might go I noticed there was no pcv valve where it was suppsoed to be.
Looking at this pic: http://images.mustang50magazine.com/techarticles/138_0308_15z+ford_mustang+pcv_valve.jpg
It shows a rubber grommet and then you put the pcv valve inside. Any ideas?
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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Stan G
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Member # 6226
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posted
Good job, you found a major air leak.
Go pick up the grommet and pcv valve ( there should be a screen in there as well ).
Hook it back up to the intake and see if it runs right now.
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1985 RX-7, 347/T-5 , T/F T/W heads, typhoon intake, Tfs2 cam, pulleys, 2500 lbs .
3.63 rear gears , Megasquirt
Posts: 105 | From: Sun Coast , Florida | Registered: Nov 2005
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mastercudaz
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Member # 7486
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posted
Fixed that today and the car seems to be running a little bit better... I guess. Now I have a major surge in the idle. To the point it will stall after a bit. I ran another test and Code 18 came up. Says something about the SPOUT connector, but I see the gray connector in there already.
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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mastercudaz
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Member # 7486
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posted
Scratch that, reseated the SPOUT connector and that code went away. Car seems to be running better, not rich now.
The idle surge is terrible though. When I am cruising and I push the clutch in, the car will stall at times while I am slowing down.
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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turbo50
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Member # 6700
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posted
Did you or someone else convert this car to a stick/manual from an auto?
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.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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mastercudaz
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Member # 7486
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posted
Yes, this car was a automatic, it was done by the original owner. Before I bought it though
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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mastercudaz
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Member # 7486
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posted
Still getting code 18 and I checked computer model and its an A9P model.
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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mastercudaz
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Member # 7486
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posted
anyone familiar?
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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Jdub07
( O Y O )
Member # 2728
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posted
Sometimes after fixing such an air leak and so many codes you need to drive the car for a little bit and run it through its cycles,...idle, cruising, wide open throttle....so that the computer than make the right adjustments to the changes you just made. When I installed my cobra upper and lower I had an air leak from the same area and the car was acting the same as yours. Buddy of mine said to do the above and before 50 miles car was perfect. Just a thought.
Posts: 7282 | Registered: Apr 2003
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mastercudaz
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Member # 7486
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posted
okay wil continue to drive it around. hard with the damn stalling at times ha
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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92stangLX
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Member # 3252
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posted
Have you cleared the codes you origional saw? They may still be stored in memory.
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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mastercudaz
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Member # 7486
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posted
I dont see the codes in the memory of the scanner and I unhooked the battery for a bit and ran the test again, and pulled the 18 still.
The stalling and major surging is still there, it will stall if I dont give it gas
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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venomous99
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Member # 1917
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posted
18(CM) SPOUT circuit open or spark angle word failure.
18(KOER) IDM circuit failure or SPOUT circuit grounded.
is your spout connected to the distributor?
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MKII Q7
89LX
Posts: 4811 | From: dc | Registered: Oct 2002
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turbo50
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Member # 6700
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posted
quote:
Originally posted by mastercudaz:
.
The idle surge is terrible though. When I am cruising and I push the clutch in, the car will stall at times while I am slowing down.
Once you clear up your spout codes have a look at the reference in this link and watch the video if you are still a non believer.
http://www.californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=017339
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.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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92stangLX
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Member # 3252
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posted
quote:
Originally posted by turbo50:
quote:
Originally posted by mastercudaz:
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The idle surge is terrible though. When I am cruising and I push the clutch in, the car will stall at times while I am slowing down.
Once you clear up your spout codes have a look at the reference in this link and watch the video if you are still a non believer.
http://www.californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=017339
Oh yeah, I remember reading about this too. You should check it out
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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mastercudaz
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Member # 7486
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posted
is that car a manual converted to a automatic? I have an auto converted to a stick (tremec 3550)
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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mastercudaz
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Member # 7486
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posted
yeah the connector for the spout is connected, is there a chance that its a faulty spout connector? is there a way I could test (i guess i could buy another one).
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1990 Mustang GT
Posts: 161 | From: San Jose | Registered: Mar 2007
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turbo50
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Member # 6700
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posted
quote:
Originally posted by mastercudaz:
is that car a manual converted to a automatic? I have an auto converted to a stick (tremec 3550)
It is an auto, converted to a stick....like you have.....
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.........when was the last time YOU built something with YOUR own hands?
I offer quality sidework at reasonable prices. PM ME
Posts: 7606 | From: Discovery Bay, California | Registered: Apr 2006
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