96 Z28 converter lock up issue come inside for this story...
10-21-2013, 05:14 PM
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96 Z28 converter lock up issue come inside for this story... Ok last night I bought a 96 Z28 LT1 4L60E. Here's the deal. The motor was replaced with a 97 LT1. I drove it home 2 hours and the converter never locked up. It spun 3k rpm all the way home at 70mph. Now it is throwing a code and was told ti was a crank position sensor code. Is there anything different between the 96 and 97 LT1s or the ecu causing a non lock up issue? I am not aware of any difference but could be totally wrong. The owner told me the 96 had a crank sensor amd the 97 motors didn't? Anyway I do know if the ecu doesn't read rpm it will not lock up the converter. Any insight would be appreciated. The trans does shift properly and very well. The car does have a bit of a high end stumble and has a brand new opti, coil, and ignition control module. I need help. Ordered a 3600 stall and don't want to put it on the car when it has this problem. The car is completely stock with the exception of a flowmaster exhaust.
10-21-2013, 06:09 PM
#3
The 96-97 motors have a crank sensor because OBDII was introduced and it's only purpose on an LT1 is misfire detection. The pcm strategy is to unlock the converter when misfires are detected to take away some of the jerking. If you're putting a stall in you will need pcm tuning done anyway so just have the crank sensor code deleted at the sametime.
10-21-2013, 08:48 PM
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Yes I know all of that. I've been in the LS1 game for a long time. But the issue is the converter is not locking up I need to know why it isn't. Is it the crank sensor that could be bad?
10-22-2013, 08:22 AM
#5
The gentleman (I assume <G>) above ( flame) gave a correct & complete answer.
The only way to know if the sensor it's self is to diagnose it correctly. Just throwing a new part at it may not fix it. Could just be a poor connection. A good scan tool, and possibly a digital lab 'scope, is needed to correctly diagnose it. Nobody on a message board can just say if throwing a new sensor at it will fix it. People can guess, but that means nothing. You might need to just take it back to the shop that did the install and have them check it out.
The only way to know if the sensor it's self is to diagnose it correctly. Just throwing a new part at it may not fix it. Could just be a poor connection. A good scan tool, and possibly a digital lab 'scope, is needed to correctly diagnose it. Nobody on a message board can just say if throwing a new sensor at it will fix it. People can guess, but that means nothing. You might need to just take it back to the shop that did the install and have them check it out.
10-22-2013, 12:23 PM
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Maybe I worded my question wrong... I understand what you both are saying. Like I said I am not new to the car game by any means. What I need to know is if there is a difference between the 96 crank sensor and the 97 crank sensor. Or if this is an issue with the convertor or transmission and maybe has nothing to do with the crank sensor. Is there 2 different reluctor wheel counts between the 96 and 97 LT1 like the LS sereies (24 or 58)
10-22-2013, 12:38 PM
#7
Maybe I worded my question wrong... I understand what you both are saying. Like I said I am not new to the car game by any means. What I need to know is if there is a difference between the 96 crank sensor and the 97 crank sensor. Or if this is an issue with the convertor or transmission and maybe has nothing to do with the crank sensor. Is there 2 different reluctor wheel counts between the 96 and 97 LT1 like the LS sereies (24 or 58)
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10-26-2013, 10:33 PM
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Ok well I got under the car. I looked at the timing cover and it had no provision for a crank sensor which would be a 94-95 motor correct? Is there another way fo tell the year of this motor? It has a vented opti. Maybe I can pull a valve cover and look for a casting date on the heads?
10-27-2013, 08:18 AM
#9
Do you even know what you have there. LOL
No crank sensor makes it a '94 or '95 engine. Do you know the year of the transmission and PCM? They are different. Sounds to me like you didn't get what you think you bought. Even '94 & '95 PCM calibrations (or "tunes") are different.
A '96 or '97 PCM should be setting crank position sensor codes, so somebody has screwed with it, and it sounds like probably not real well. Pull the PCM up, and find the Service Number (8 digit part number) to verify the year model PCM.
Drive it with the scan tool connected, and see how far the scan tool MPH is off from the speedo on the dash. The scan tool (internal) MPH is what the PCM uses for TCC, shifting and emissions controls that reference MPH.
No crank sensor makes it a '94 or '95 engine. Do you know the year of the transmission and PCM? They are different. Sounds to me like you didn't get what you think you bought. Even '94 & '95 PCM calibrations (or "tunes") are different.
A '96 or '97 PCM should be setting crank position sensor codes, so somebody has screwed with it, and it sounds like probably not real well. Pull the PCM up, and find the Service Number (8 digit part number) to verify the year model PCM.
Drive it with the scan tool connected, and see how far the scan tool MPH is off from the speedo on the dash. The scan tool (internal) MPH is what the PCM uses for TCC, shifting and emissions controls that reference MPH.
Last edited by Ed Wright; 10-27-2013 at 08:31 AM.
10-27-2013, 12:04 PM
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I can't find an LT1 scanmaster so what scan tool is reccomended? Do they even make scanmasters anymore? That was the most helpful tool I had when tuning my Grand National.
10-27-2013, 12:16 PM
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What if I got these?
http://item.mobileweb.ebay.com/viewi...d=121201351215
And a 96-97 timing cover and crank sensor... would that work if I retrofitted it all?
http://item.mobileweb.ebay.com/viewi...d=121201351215
And a 96-97 timing cover and crank sensor... would that work if I retrofitted it all?