LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Out of ideas

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Old 07-19-2006, 08:43 PM
  #46  
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Re: Out of ideas

Do you have anyway of scanning the car? Laptop and cable?
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Old 07-19-2006, 09:02 PM
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Re: Out of ideas

Originally Posted by Sweetred95ta
Do you have anyway of scanning the car? Laptop and cable?
been there, tried that with 2 different PCM's

2 different cables


Same computer
same software datamaster DA

It wont read.
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Old 07-19-2006, 09:25 PM
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Re: Out of ideas

Test the resistance of the wire. Make sure it matches the other wires. Then, buy a vacuum gauge and test the actual vacuum.
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Old 07-24-2006, 11:23 PM
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Re: Out of ideas

Originally Posted by Sweetred95ta
Test the resistance of the wire. Make sure it matches the other wires. Then, buy a vacuum gauge and test the actual vacuum.

Took off the timing cover and checked out the mechanical aspects of the engine, and the opti position.

Checked the Coil - its good
New Opti
New ICM
New MAP
New TPS
New EVAP solenoid
New EGR solenoid

I'm going broke on probably perfectly fine sensors - since i cant scan the car it's a game.... a crappy game!

Everything is perfect.. With all the mechanical aspects.

I Just ordered new spark plug wires to rule them out. Even though they are verynew Accel 8mm wires I had crimped 2 of them between the block and the accessory bracket. I am replacing them and hopefully all these issues will just vanish

I want to thank everyone here for your help there are a lot of replies in this thread from many members, and I do truly appreciate it so THANKS!

I'll figure it out sooner or later and then it will be :hyper: AWESOME!

Thanks
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Old 07-24-2006, 11:26 PM
  #50  
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Re: Out of ideas

Originally Posted by tritonium
been there, tried that with 2 different PCM's

2 different cables


Same computer
same software datamaster DA

It wont read.

Sounds like you have a chip install error or bad PCM.

To double check you can jump the upper two right pins of the DLC and see if the SES light blinks. IF it doesn't ou have a problem with the pcm or chip.

Without a datalog your going to keep throw money at it. Its best to just figure out how to get the datalog to work at least so we can find the issue.
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Old 07-24-2006, 11:41 PM
  #51  
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Re: Out of ideas

I just thought of this. You migth want to try and disconnect the computer. Find out which pins go to the diagnostic port and do a continuity test for each wire. Make sure nothing got pinched somewhere in the harness. This way you can rule out the harness as being a reason for the communication error with the computer.
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Old 07-25-2006, 07:16 AM
  #52  
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Re: Out of ideas

Even w/out Datamaster, you can check most of the sensors with a multimeter to make sure they are working correctly. Shoebox's website has everything you need. Hopefully the plug wires fix it.
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Old 07-25-2006, 09:09 AM
  #53  
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Re: Out of ideas

Originally Posted by Alvin@pcmforless.com
Sounds like you have a chip install error or bad PCM.

To double check you can jump the upper two right pins of the DLC and see if the SES light blinks. IF it doesn't ou have a problem with the pcm or chip.

Without a datalog your going to keep throw money at it. Its best to just figure out how to get the datalog to work at least so we can find the issue.
The car does enter it's diagnostic mode so I do not believe it was a chip install error, not a bad PCM . Just to clarify - The PCM is the computer the chip is installed into.

When i was converting the car there was a small black rectangular box that had a 14 or 20 pin green connector on it. The box was a big bigger than the average wallet. What is this - and could it cause all these issues?
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Old 07-25-2006, 09:10 AM
  #54  
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Re: Out of ideas

Originally Posted by LT1_383
I just thought of this. You migth want to try and disconnect the computer. Find out which pins go to the diagnostic port and do a continuity test for each wire. Make sure nothing got pinched somewhere in the harness. This way you can rule out the harness as being a reason for the communication error with the computer.

I will do this -

Could the wires be pinched even if the car enter diagnostic mode with the paper clip method?

Thanks .
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