Ignition timing/advance test
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Ignition timing/advance test
Hi all,
I have a 1989 Bronco XLT 5.0, and bought a OBD-1 code reader. In the manual, it specifies first to do KOEO, and if no fault codes, then check the computer's ability to advance timing. It reads that, once the code reader is connected to the wiring harness, engine started, and test button pushed, the computer will automatically ADVANCE timing 20 degrees (+/- 3 degrees) above factory spec, which is 10 deg BTDC on my Bronco, and it will hold this for 2 minutes.
Question is: My Bronco only hit 10 degrees above factory spec (it stayed at 20 degrees BTDC for the 2 minute test, instead of 30 degrees) I did the test with the SPOUT connector "connected".
Anyone else had this issue? Should I be worried? I recently set the base timing at 10 BTDC with SPOUT connector un-connected.
Thank you and Happy New Year!
Chad
I have a 1989 Bronco XLT 5.0, and bought a OBD-1 code reader. In the manual, it specifies first to do KOEO, and if no fault codes, then check the computer's ability to advance timing. It reads that, once the code reader is connected to the wiring harness, engine started, and test button pushed, the computer will automatically ADVANCE timing 20 degrees (+/- 3 degrees) above factory spec, which is 10 deg BTDC on my Bronco, and it will hold this for 2 minutes.
Question is: My Bronco only hit 10 degrees above factory spec (it stayed at 20 degrees BTDC for the 2 minute test, instead of 30 degrees) I did the test with the SPOUT connector "connected".
Anyone else had this issue? Should I be worried? I recently set the base timing at 10 BTDC with SPOUT connector un-connected.
Thank you and Happy New Year!
Chad
Lead Driver
Joined: Sep 2002
Posts: 9,182
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From: Gateway to the West
One question... did you set base timing with the engine at full operating temperature? Thermal changes as the engine is warming up affect idle speed and timing readings until the engine is at full op. temp.
If you did this, I wouldn't be worried about it unless you are experiencing some sort of performance issues or you are getting some other fault codes.
Happy New Year
If you did this, I wouldn't be worried about it unless you are experiencing some sort of performance issues or you are getting some other fault codes.
Happy New Year
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Yep, I did set base timing at normal operating temp. And once the "20 degree advance" test stopped, it popped right back down to 10 deg BTDC, so I guess the base timing held correctly. (I did the test after driving it around for a while)
No performance issues, so I guess I'm good. Just trying to pass the formidable California smog test! Thanks for the quick reply.
chad
No performance issues, so I guess I'm good. Just trying to pass the formidable California smog test! Thanks for the quick reply.
chad
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
Ah yes, go to the "User CP" link at the top of the page. From there you should be able to get to every aspect of your profile, gallery and signature along with the ability to change how, when and if you receive email and private messages through the forum. You can even subscribe to a particular forum or have notices sent to you when a thread that interests you receives a new post. Welcome!
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