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

Torqhead install not starting

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Old Oct 1, 2022 | 04:00 PM
  #21  
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Fuel is perfect. Pull that FP fuse. Again

Ground problem.
Fuse
The TH system uses genuine Crank & Cam sensors. Very rare. But need to rule them out.

You have a stand alone ECU.. Holley EFI Mgt?
Did you tap into your harness?
No longer on the factory ECU/ PROM combo. Correct.


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Old Oct 1, 2022 | 04:35 PM
  #22  
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I am using the 411 pcm that TorqHead provides
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Old Oct 1, 2022 | 04:49 PM
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Man.
Sorry, to hear that.
I'm sure it's simple. Oversight
At this point. The TH kit is plug & play.
Mine fired up instantly.. super smooth. My only issue was the base tune, ZF pulse, Fans not kicking in.
But. I purchased at the threshold of proto/ release date. I know that kit should be perfected. Now.

Paul is great to work with. Shipping to CAN. Is not fun. Did that once.
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Old Oct 1, 2022 | 04:53 PM
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Sorry, silly question. your LT1 is a 94- 95 correct.
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Old Oct 1, 2022 | 05:04 PM
  #25  
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Yes 94
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Old Oct 1, 2022 | 05:14 PM
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Originally Posted by Impala Balko
Yes 94
Ok, back to basics. You must have a scan tool.
Or HP tuner basic. OBD II to USB cable. to data log?
At least to validate PCM parameters.
Some of your dash functions are lost with the TH kit.
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Old Oct 1, 2022 | 06:19 PM
  #27  
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No scanner or HP Tuners... how much and where can I get the software and cables. What dash functions do I lose because I was under the impression that I wouldn't lose any
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Old Oct 1, 2022 | 06:35 PM
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EFI .. must have.
Quickest. Resolution. To eliminate online ship time.
Local store. That has a OBD II scanner. Due to the fact you converted to OBD II. Simple is ok. More advanced is best. Like datalog.
You will need to datalog everyday. Start, idle, part - WOT. Especially when you connect. Boost.
If i were you. Get a wideband. Install. Pre turbo.
The wide band is invaluable.

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Old Oct 1, 2022 | 06:41 PM
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Originally Posted by THE 383 admiral
EFI .. must have.
Quickest. Resolution. To eliminate online ship time.
Local store. That has a OBD II scanner. Due to the fact you converted to OBD II. Simple is ok. More advanced is best. Like datalog.
You will need to datalog everyday. Start, idle, part - WOT. Especially when you connect. Boost.
If i were you. Get a wideband. Install. Pre turbo.
The wide band is invaluable.
I have a innovate wide band installed pre turbo.
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Old Oct 1, 2022 | 06:58 PM
  #30  
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Another silly question.
Paul, did flash your VIN onto the TH~ PCM. correct.

Future. Someone will need to tune.
You have some homework to do.


https://www.hptuners.com/

Two kits. Pro kit with a adapter to montior a Wideband while datalogging. Fantastic feature.
Standard kit. Cannot convert. However. They allow a trade- up credit.
Your choice.

Software is licensed per PCM = pay for other PCMs.
But you currently only need to tune one PCM.
Cost effective.
or way more money for a series of models. Price is per credit.
1 credit = $49.95.

The ALDL cable you can find places like CATS, tunerpro.
Two styles to choose OBD I solo cable
Or a Y cable to use on both OBD I & II
I have the Y cable from CATS. Industrial quality very thick. This current cable price. is double. Compared when i purchased. Mine.
I know mine works with. Datamaster and of course HP tuner.
Hopefully this helps out a bit.


Last edited by THE 383 admiral; Oct 1, 2022 at 07:48 PM.
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Old Oct 1, 2022 | 08:11 PM
  #31  
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Originally Posted by Impala Balko
No scanner or HP Tuners... how much and where can I get the software and cables. What dash functions do I lose because I was under the impression that I wouldn't lose any
my last understanding.
The downside. Calculations like Diag codes from dash, the driver information system/ Trip monitor Avg MPG & related. Non existent. Due to CCC connection.
Unless a recent revision was made?

This sucks. After tuning the factory PCM.
Nobody will/ would believe my average MPG
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Old Oct 2, 2022 | 08:29 AM
  #32  
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Is there any fuse that would cut power to the new coil packs

Last edited by Impala Balko; Oct 2, 2022 at 09:11 AM.
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Old Oct 2, 2022 | 09:21 AM
  #33  
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Originally Posted by Impala Balko
Is there any fuse that would cut power to the new coil packs
Yes, sir.
Indeed, there is.
The LS coils are patched into the factory coil fuse. (25) 3rd section top row right hand side 10A fuse
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Old Oct 2, 2022 | 09:55 AM
  #34  
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I didn't think to check that fuse.... its a long shot but it may work
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Old Oct 3, 2022 | 08:42 AM
  #35  
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Originally Posted by THE 383 admiral
Do you have a timing light. Just place the PU. Coil on your wires. You should see spark from the flashing strobe light. Alot easier and safe.
This system should still fire without the crank sensor.
The cam sensor is critical.
My experience was opposite. I bad Crank sensor the car will have no spark. A bad cam sensor, or broken cam reluctor ring the car will fire but be hard to start and have a check engine light for low resolution.
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Old Oct 3, 2022 | 11:08 AM
  #36  
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How tight does the crank sensor need to be to the wheel because the way I have it setup there is a little drag on the tape... I sent these pics to Paul and he said they looked good... so a bad crank sensor will cause no spark?


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Old Oct 3, 2022 | 02:28 PM
  #37  
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The clearance/ gap looks perfect.
Just enough contact to feel drag/ Resistance.

Re-read from TH my previous is backwards

Straight from TH
***Crank sensor spark critical***

"The crankshaft reluctor has 24 unique pulses per 360 degrees of engine rotation that the Gen 3 PCM interprets to know engine position. This is where the "24x" terminology/saying comes from.

**** Cam sensor spark on / off****

The camshaft reluctor provides what is called the "1x" signal because it is either on or off for 360 degrees of engine rotation. The camshaft reluctor allows the PCM to know an important piece of information.....whether a given cylinder is on its firing stroke or intake stroke"

End result. Your coils are connected, good fuse? proper crank sensor gap. NO spark.

Unknown reason points to the crank sensor.

What did Paul say. Besides the crank sensor gap looks good.


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Old Oct 3, 2022 | 04:03 PM
  #38  
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Originally Posted by THE 383 admiral
The clearance/ gap looks perfect.
Just enough contact to feel drag/ Resistance.

Re-read from TH my previous is backwards

Straight from TH
***Crank sensor spark critical***

"The crankshaft reluctor has 24 unique pulses per 360 degrees of engine rotation that the Gen 3 PCM interprets to know engine position. This is where the "24x" terminology/saying comes from.

**** Cam sensor spark on / off****

The camshaft reluctor provides what is called the "1x" signal because it is either on or off for 360 degrees of engine rotation. The camshaft reluctor allows the PCM to know an important piece of information.....whether a given cylinder is on its firing stroke or intake stroke"

End result. Your coils are connected, good fuse? proper crank sensor gap. NO spark.

Unknown reason points to the crank sensor.

What did Paul say. Besides the crank sensor gap looks good.
I showed him the picture when I was putting everything together because I thought the slight drag notation on the directions was a little vague. He just said it looked correct.
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Old Oct 3, 2022 | 08:35 PM
  #39  
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Long shot.
Just below fuse 25
What about fuse 30 [10a]

Ps. My Crank PS gap is precisely .020

Last edited by THE 383 admiral; Oct 3, 2022 at 10:27 PM.
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Old Oct 3, 2022 | 10:33 PM
  #40  
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Fuse 25 and 30 are both good... I think I may have a bad crank position sensor. Can I buy a new one at the parts store for this? What's the part number for it?
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