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

Little computer work on Sat. night...

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Old Jul 19, 2008 | 08:51 PM
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Default Little computer work on Sat. night...

I Got It I GOT IT I GOT IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Icc Fault Trips When Cooling Fan Comes On. That We Know.

So, Here's What We Do:
Yup, I got it alright... with a 32oz framing hammer



Works every time.
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Old Jul 19, 2008 | 08:59 PM
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So, what's the next step? New pcm?

I also wanted to ask, does the car not display any negative symptoms before it gets hot?
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Old Jul 19, 2008 | 09:57 PM
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Originally Posted by cwyates4
So, what's the next step? New pcm?

I also wanted to ask, does the car not display any negative symptoms before it gets hot?
Yeah, new PCM.

Runs fine till the fan comes on. Then it starts a real light 'miss'. Really even hard to tell, even at idle. Only way I knew for sure was at speed, I could tell by fuel economy that it had reverted to open loop.

Zeits' said his ran pretty bad after it tripped the ICC fault. Strange, cause I know it's the same problem bad PCM.

Sometimes the ICC fault was already in the computer after clearin' codes. And so are a few other codes sometimes, like VSS signal loss, which doesn't trip until after the car has MOVED!!!

I shoulda' figured it out long ago, but I just wanted to know for sure it was the PCM. It says right there in the FSM, that ICC fault diagnostics ENDS at a bad PCM. I was hardheaded, and tried to find other stuff to tie into the problem. I sorta' did, but 'sorta' don't catch no fish.
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Old Jul 19, 2008 | 11:13 PM
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Zeit's different ignition setup probably has something to do with his running rougher.

You did way more work than almost any of us would have done. I really thought you had something there for a while with the fan causing it.

Hope you find one at a decent price. I didn't even find one with a quick search on the bay of E.
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Old Jul 19, 2008 | 11:48 PM
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Much appreciated, Chuck! I'll price out PCM options.

I can't go YOUR route, because my Vette is a daily driver...no butterflying the stock PCM without a replacement first.
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Old Jul 20, 2008 | 02:19 AM
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Originally Posted by cwyates4
Zeit's different ignition setup probably has something to do with his running rougher.

.
Good point - I forgot he has different ignition...

I didn't see any scorch marks, no fat capacitors, no toasty smell, like I've seen on pc motherboards. Doesn't matter tho', it's done.

I already zipped it back up, and put it back in the car. It showed C12 good communication, 1 module clear, 4 module clear, 9 module gave H72 VSS loss no good until the car has MOVED!!! It was tryin' to trip the door locks too, which I had seen before on a few occasions.

Then I started it up, and it idles as good as ever. Soon as it warms up tho', I know what's gonna' happen...
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Old Jul 21, 2008 | 10:36 AM
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Schrade, let me know how the car runs. If you're getting a new PCM, I'll let you be the guinea pig to see if that's the fix.

I'm inclined to just buy a reman PCM from RockAuto...it's only $95 plus core and shipping.

Hope everything goes well for you!
Clay
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Old Jul 21, 2008 | 01:44 PM
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Originally Posted by zeitgeist57
Schrade, let me know how the car runs. If you're getting a new PCM, I'll let you be the guinea pig to see if that's the fix.

I'm inclined to just buy a reman PCM from RockAuto...it's only $95 plus core and shipping.

Hope everything goes well for you!
Clay
I just ordered one at Advance Auto. Auto Zone in the next town told me this morning $90, but not available right now (a week or so). I stopped at Advance Auto around the corner from my house, and their supplier is the same folks - Cardon Cardone? It will be here in a couple of days.

Part # at Advance and Auto Zone is the same - you might need this - 771333F SAME FOR '95 - I saw it on the computer screen. They DO need your VIN when it's ordered - make sure the VIN gets to the vendor's ears in front of ya'!!! Otherwise you're gonna' have to go to the dealer$$$.

They want the old box. Drat! I wanna' see how it works.
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Old Jul 21, 2008 | 10:42 PM
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I went to www.advanceautoparts.com and they didn't have the Cardone part number???
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Old Jul 21, 2008 | 10:58 PM
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What's up Clay...

I'm sure the whole Advance Auto network is on the same database - here's a copy of the receipt. The handwritten # on the pepsi receipt is the ORDER # for the PCM - maybe some help there...

The part is THE SAME for the '95 - I asked, and saw it on the screen - but you WILL have to get the sales guy to give the Cardon guy your VIN!!!

Last edited by schrade; Aug 4, 2008 at 12:19 AM.
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Old Jul 22, 2008 | 09:24 AM
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[SING] I've got your credit card numberrrr! [/SING]

Thanks for the info! Again...if it works for you, I'll pull the trigger also. The only three things it could POSSIBLY be are a bad Opti, bad harness, or bad PCM.

Since my DelTeq system tells me when the Opti is putting off a bad signal (LED on the "brain box" blinks if the signal is weak) and it has not done that at all over the past few weeks, I'm ruling out a bad Opti or bad wiring harness...for now. $100 is cheapness if it fixes this stupid problem. My fuel economy has gone to crap so I'll make up the rebuilt PCM cost in reduced gas consumption and repairs down the road...
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Old Jul 22, 2008 | 03:22 PM
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"Order confirmation in error - item not available"

That was the email that the guys at the local store got this morning. Another 20 minutes on the phone, and NO success. A lead - Blue Streak, but no contact yet.



EDIT:
Just got off the phone with Blue Streak. Everything arranged... I thought.

me: "Where do I ship it to?" (for reman)

them: "Who are you with?"

me: "I got your name from a retailer."

them: "We don't deal directly with the public."

me: (getting short now) "Okay, gimme' some names - some retailers' names!"

them: "Pep Boys, Carquest..."

me: "Thanks click"



Headed for Car Quest in the am. $120.00 + S&H; 10 - 14 days.

ALL THE *******!!!!!!!!!!!!!!!!!!!!!!!!!!!


AGHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH H
HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH

ARGHHHH.

#(^&)&%)&w%(*&#@%$&^(%%#@*&^*&*(&@#*&^*& %^%^&*)^%#$

Last edited by schrade; Jul 22, 2008 at 04:09 PM.
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Old Jul 22, 2008 | 04:20 PM
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That's a lot of *******. And a lot of bulls&%t.

Wow...looking forward to how this works out for you. Is CarQuest giving the 'puter to you already programmed and ready to go? Better be. Does the $120 include core, or are you bringing your "split" PCM to them as a core exchange?

Actually, I hope that I don't get YOURS as a reman unit!!!
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Old Jul 22, 2008 | 06:34 PM
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Originally Posted by zeitgeist57
That's a lot of *******. And a lot of bulls&%t.

Wow...looking forward to how this works out for you. Is CarQuest giving the 'puter to you already programmed and ready to go? Better be. Does the $120 include core, or are you bringing your "split" PCM to them as a core exchange?

Actually, I hope that I don't get YOURS as a reman unit!!!
$120 is everything, except for S&H. No, they don't have one now, I gotta' wait for mine to come back. 10 - 14 days. Only thing else to do is buy a junkyard unit, and the only one I found was used / $200 / 30 day warranty. No can do. For 2c, I want a year warranty.

I didn't do anything to mine, just broke the seal. The multimeter and the hammer was for laffs. I already put it back in and fired it up. Ran just as good as ever.

Till the glitch lights up, and trips up stray codes and misfire...
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