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Author Topic: 393w idle problem, koeo code 67  (Read 3642 times)
Mww460
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« on: April 08, 2013, 01:04:33 am »

Ok over the past year I  have been doing a carb to efi swap on my 93 lx with a 393w and t-5. The car was originally a 4 banger/auto. Got a 93 efi computer harness along with injector and o2 harness with a3m ecu. SCT chip was sent to Bob Kurgan for a base tune to just get the car up and running then will go to him for final dyno tune.

Fired the car up for the first time friday, set the timing to 12 degrees with spout out and set fuel pressure to 45psi with vacuum hose unhooked.

Car starts fine but will not idle right, it surges then dies if i dont give it gas. I checked the tps sensor with the key on engine off and it was .95v. Left the meter hooked up and started the car it drop to .35v and is veryy irratic. Cut the car off and it right back to .94v. Is that normal?

Checked the KOEO codes and got 67 and 85.

Joel i found a thread where u explain code 67 and I understand why im getting it due to my t5 swap and nothing is hooked up to the senor in the trans because i could never find a t5 harness. Im going to ground it like you mentioned in the thread, but do you believe this is causing my idle issue?

I have been unable to run a KOER test but i believe it due to code 67.

Am I going in the right direction, any other suggestions? Thanks Michael
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1993 Mustang LX with a soon to be 393w, 5 speed
Joel5.0
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« Reply #1 on: April 08, 2013, 09:24:14 am »

That TPS signal voltage difference is not normal, compare it using battery (-) as the ground reference and compare when the SIGRTN wire is used as the reference ground. You are on the right track regarding grounding pin 30 to be able to run a KOER.... which I do suggest. Also make sure to perform a correct base idle reset/calibration as explained at http://sbftech.com/index.php/topic,1031.0.html. LUK
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ACRONYMS:
LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
Tuning on a Dyno for the track, is like swim practice in a bathtub.
I can explain it for you, but I can't understand it for you. (90lxcoupe)
The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
Nothing sways the stupid more than arguments they can't understand - Cardinal de Retz
Mww460
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« Reply #2 on: April 10, 2013, 03:11:41 pm »

Got code 67 gone, got it up to temp its idling better but cold it still dies. Ran a KOER and got 11 so from my understanding thats good. Only code I have is KOEO code 85?

Also the tps is holding steady
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1993 Mustang LX with a soon to be 393w, 5 speed
Joel5.0
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« Reply #3 on: April 10, 2013, 04:45:10 pm »

Idle RPM w/IAC disconnected is? Suggest setting it to 700-750 RPM. Also make sure TB and TB blade edges are clean. LUK
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ACRONYMS:
LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
Tuning on a Dyno for the track, is like swim practice in a bathtub.
I can explain it for you, but I can't understand it for you. (90lxcoupe)
The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
Nothing sways the stupid more than arguments they can't understand - Cardinal de Retz
Mww460
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Location: Birmingham, AL

« Reply #4 on: April 29, 2013, 09:33:08 pm »

The car will not idle at all cold. Once it warms up it will idle, surge, and after a few mins it will die. I got a new motorcraft iac valve, which changed nothing. I canset the idle around 800 rpm with iac disconnected, but once I turn the car off and reconnect iac it still does not idle right. I drove the cararound the block, and the car is a beast off idle, come to a stop sign and car dies.

I'm running out of ideas. I have checked the grounds which all look good. Only vacuum lines I have is to brake booster and fuel pressure reg.

I'm unsure how old the tfi module is, got the dist on trade?
Any other sensors that could cause this and not throw a code?
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1993 Mustang LX with a soon to be 393w, 5 speed
Mww460
6 Banger
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Posts: 84


Location: Birmingham, AL

« Reply #5 on: April 29, 2013, 09:34:34 pm »

Also the throttle body is brand new, I'm going to take the MAF out and clean it to see if that helps
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1993 Mustang LX with a soon to be 393w, 5 speed
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