Codes and crappy idle

Georgia306 · Jan 1, 2010

Ok well I have two questions. 1. My mustang is a 92 GT and from what I have read it should have a three digit code right, but as a three digit code they make no sense. Only as a two digit code will they work. 2 how can the codes I have possibly make my car idle so badly? They are
KOEO
85-canister purge circuit
33-canister or EGR valve not operational
95-fuel pump circuit problem
96-fuel pump circuit
KOER
44-air management system inop
33-canister or EGR valve not operational
21-coolant temp sensor out of specified range
94- secondary air system inop

stangfanatic · Jan 2, 2010

Well, if you do have an EGR valve on it and it is not working properly (i.e. allowing too much exhaust gas in at idle), that could cause a bad idle. Could have a bad ground on the fuel pump also.

Georgia306 · Jan 2, 2010

Found my TPS was at 1.46. Changed it to .98 and she idles great now, but I do think there is something wrong with my timing. I set it at 12BTDC with the spout out then put it back in and it went to 20 and wonders up and down to 24/25. Is this normal? O and my car has no EGR/smog crap on it.

2002BLGT · Jan 2, 2010

Georgia306 said:
Found my TPS was at 1.46. Changed it to .98 and she idles great now, but I do think there is something wrong with my timing. I set it at 12BTDC with the spout out then put it back in and it went to 20 and wonders up and down to 24/25. Is this normal? O and my car has no EGR/smog crap on it.

timing should go up some with spout back in , this is normal , the codes for the egr are going to stay there until you get a chip to delete them , but they should not affect much on a foxbody if you just leave it as it is . it should run fine just like you have it

liljoe07 · Jan 2, 2010

Georgia306 said:
Ok well I have two questions. 1. My mustang is a 92 GT and from what I have read it should have a three digit code right, but as a three digit code they make no sense. Only as a two digit code will they work. 2 how can the codes I have possibly make my car idle so badly? They are
KOEO
85-canister purge circuit
33-canister or EGR valve not operational
95-fuel pump circuit problem
96-fuel pump circuit
KOER
44-air management system inop
33-canister or EGR valve not operational
21-coolant temp sensor out of specified range
94- secondary air system inop

Mustangs are an exception when it comes to the 3 digit codes on the 92-93 models. Besides the 94 and later stangs, the rest are 2 digit.

If the KOER codes where ran while the engine was cold, then code 21 will show. Engine needs to be at operating temp when the codes are ran. Needs to be at least 170° for the ECT to not throw a code in the KOER test. If the engine was at OP temp, and code 21 is still there, then its a bad sensor, or a wiring problem. 94 and 44 are smog based codes, wont cause a problem if the smog is removed. Other than that you are fine.

Codes and crappy idle

Georgia306

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Georgia306

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2002BLGT

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liljoe07

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Codes and crappy idle

Georgia306

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Georgia306

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