C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

weird timing???

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Old Dec 12, 2004 | 04:32 PM
  #21  
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also i forgot to mention i did not reset the computer.
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Old Dec 12, 2004 | 05:02 PM
  #22  
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jesse, i'm not looking on my scanner all i'm doing is checking my base timing thats at 8btdc. with a timing light it's just a normal light with no *****.
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Old Dec 12, 2004 | 05:19 PM
  #23  
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also the 8 is the base when disconnected and the 12 is when it is connected and they are on the same side of the pointer btdc.
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Old Dec 12, 2004 | 05:36 PM
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Originally Posted by mikey whipreck
and where do you do that?
I removed the blue wire (ckt #496) from terminal "E" of the 5 wire plug at the ESC module.

RACE ON!!!
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Old Dec 12, 2004 | 06:20 PM
  #25  
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CFI-EFI if you have nothing to say about this thread thats fine but if you and mikey whipreck want to talk about a esc then start your own thread. thanks
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Old Dec 12, 2004 | 07:48 PM
  #26  
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Originally Posted by 6spd
CFI-EFI if you have nothing to say about this thread thats fine but if you and mikey whipreck want to talk about a esc then start your own thread. thanks
Well EXCUSE me!
I have posted several responses in an attempt to aid you. I was the first to point out, that if your ESC, connected and disconnected, readings were only 6* apart, that there were problems. Then your chip burner stepped in and I figured you were in better hands.

I'm sorry if answering another posters question BOTHERS you. Besides, listening to ESC topics MAY help your problem.

RACE OFF!!!
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Old Dec 12, 2004 | 08:15 PM
  #27  
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well i just thought that my topic was being takin over thats all. this is becoming a problem for me and i need to get it worked out. when there is a reply i go and see what was written and it's anthor topic. and i just thought mine would be forgotten about. no hard feelings but for people like you that do understand things like this it's easy to fix.
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Old Dec 12, 2004 | 08:51 PM
  #28  
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Originally Posted by 6spd
well i just thought that my topic was being takin over thats all. this is becoming a problem for me and i need to get it worked out. when there is a reply i go and see what was written and it's anthor topic. and i just thought mine would be forgotten about. no hard feelings but for people like you that do understand things like this it's easy to fix.
I mentioned some 20 or so posts back, that if your ESC connected and disconnected timing only shows a 6* difference, then something was wrong. Ski-dwn-it, the man that burned your chip, jumped in and among other things, confirmed that. Regardless of the altered calibrations, it still FUNCTIONS in the same manner. It's time to get out the Factory Service Manual (Helms) and the DVOM and start checking components. And it.

RACE ON!!!
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Old Dec 12, 2004 | 09:00 PM
  #29  
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okay in your opinon what should i start looking for??? but i must say when i did have my ezlink on a while back my spark advance was 25 at idle now with the base at 8 thats 33 advance i thought that was right. so what your saying is with the esc connected and diconnected i'm only seeing a 6 diffrence what should it be. thanks
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Old Dec 12, 2004 | 09:28 PM
  #30  
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Originally Posted by 6spd
so what your saying is with the esc connected and diconnected i'm only seeing a 6 diffrence what should it be. thanks
No! That is what YOU'RE saying. Jesse burned your chip. Go back and reread what HE said.

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Old Dec 12, 2004 | 09:51 PM
  #31  
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Sorry dude....

I thought CFI-EFI had disconnected his est wire- So I was gonna suggest you do the same to see if something else is wrong...

I was wrong, he corrected me saying that he disconnected his knock sensor, and I was curious how he did that...

I would not classify 1 question as stealing your thread... but I'm sorry if I pi**ed you off...

oh and thanks for the tip, CFI-EFI

Last edited by mikey whipreck; Dec 12, 2004 at 09:55 PM.
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Old Dec 12, 2004 | 09:57 PM
  #32  
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thats okay i guess i more pissed at my self because i'm to retarded to figure out whats going on.
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Old Dec 12, 2004 | 11:26 PM
  #33  
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6spd,

SOunds to me like you have a problem with either your ESC and/or the ECM.

At this point, I would have to say *IF* everything else is being read correctly, which only you can be sure of. I would suggest you head to the autoparts store and beg/plead for them to let you trial run a replacement ECM. Even if you do it in the parking lot of the store, which would be easy to do. To see if you see a larger jump in connected ESC to Unhooked.

Bottom line is you should be seeing at least 15-19* MORE when you plug in the ESC to achieve around 20-25* at idle.

Can't explain it any other way. You are reporting that your only seeing 6* additional. That is not right.

I asked a few other things through the post here that might also help. Most importantly, when you rev up the car with the ESC plugged in, and reading the timing at idle with your light, when you rev it up slightly, does the timing go up. It should go up to around high30s, when in park and about 3500 RPM. That would be another easy test to see if the ESC/ECM is adding the right amount of timing.

If not, then start replacing components. I am not sure if the 91s have a ESC module like the earlier cars have.??? I suggest as CFI mentioned, you get out the manual and start doing some tracking. Any codes your getting?? Not sure if you would or not.

Also, I know CFI pretty good and I am sure he meant no harm by answering the other question...in addition, I am sure he would do everything in his power to help you in your current situation.
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Old Dec 13, 2004 | 09:31 AM
  #34  
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The ESC is on the memcal on the 90-93's. It's that little board next to the chip.
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