PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

car in shop may need computer?

Thread Tools
 
Search this Thread
 
Old Dec 12, 2008 | 01:26 PM
  #1  
kirkjames90's Avatar
Thread Starter
Staging Lane
15 Year Member
iTrader: (5)
 
Joined: Oct 2007
Posts: 83
Likes: 0
From: Texas
Default car in shop may need computer?

ok so my car is in the shop and they guy looking at it isnt finished yet but says the computer could be messing up which makes sence cause it messes up on/off randomly

so my question is where is a cheaper place to buy a computer for a 1999 Trans Am im sure there dealership will charge way more then necessary btw it will need to already be programmed

thx
Reply
Old Dec 12, 2008 | 03:43 PM
  #2  
MattysTA's Avatar
11 Second Club
iTrader: (18)
 
Joined: Jul 2004
Posts: 255
Likes: 0
From: NJ
Default

try ebay
Reply
Old Dec 12, 2008 | 03:51 PM
  #3  
Old Geezer's Avatar
TECH Senior Member
iTrader: (3)
 
Joined: Jun 2004
Posts: 5,639
Likes: 71
From: GA, USA
Default

How is the tech determining that the ECM "may be messing up"??
What are the problems, to begin with?
Scanned w/ data logs?
Reply
Old Dec 13, 2008 | 04:16 AM
  #4  
TAQuickness's Avatar
TECH Junkie
iTrader: (28)
 
Joined: Jan 2004
Posts: 3,250
Likes: 1
From: Houston
Default

call jess @ wait4me (UN: wait4me)
Reply
Old Dec 13, 2008 | 05:07 AM
  #5  
edcmat-l1's Avatar
Banned
iTrader: (10)
 
Joined: Jul 2006
Posts: 4,782
Likes: 4
From: Va Beach
Default

Originally Posted by Old Geezer
How is the tech determining that the ECM "may be messing up"??
What are the problems, to begin with?
Scanned w/ data logs?
I'd like to know the same. What is his diagnostic process? These computers are very robust. They have a very low failure rate. Many wiring problems can easily be misdiagnosed as a bad computer.
I typically get them (cars) after someone's replaced the computer and that hasn't fixed them.
Reply
Old Dec 13, 2008 | 06:53 PM
  #6  
Doc's Avatar
Doc
FormerVendor
iTrader: (9)
 
Joined: May 2003
Posts: 1,573
Likes: 0
From: Jacksonville, Fl
Default

+2 on the bad pcm diagnosis. The GM side mount battery with the liquid acid battery-boil over senario eating up a cable is pretty common. Broken batter mount letting the battery slide around will cause these problems as well.
Reply
Old Dec 14, 2008 | 04:11 PM
  #7  
kirkjames90's Avatar
Thread Starter
Staging Lane
15 Year Member
iTrader: (5)
 
Joined: Oct 2007
Posts: 83
Likes: 0
From: Texas
Default

because while driving it around itll randomly misfire and the car will start shaking pretty bad you can go WOT and it goes just fine but makes pop sounds sometimes then after u try to cruise again it does the same thing

things replaced
plugs/wires
TPs sensor
crank sensor
MAF
cleaned TB
replaced O2 sensors
New fuel pump
New fuel and air filter
might be missing something idk
Reply
Old Dec 14, 2008 | 06:44 PM
  #8  
Doc's Avatar
Doc
FormerVendor
iTrader: (9)
 
Joined: May 2003
Posts: 1,573
Likes: 0
From: Jacksonville, Fl
Default

I take it you have LTs? Can you elaborate on your mods besides what is in your sig?
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

 Pouria Savadkouei
story-1

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

 Verdad Gallardo
story-2

7 Most Reliable High-Performance Engines GM Has Ever Built

 Verdad Gallardo
story-3

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-4

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-5

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-6

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-7

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-8

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-9

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
Old Dec 14, 2008 | 07:29 PM
  #9  
BuffJoeyD's Avatar
TECH Regular
iTrader: (2)
 
Joined: Feb 2004
Posts: 426
Likes: 0
From: 1985
Default

Sounds like either bad sensors, or bad tune for the car.

Random issues caused by the computer dont mean the computer is bad - it just sounds like the computer is taking the info that is being sent to it and causing the car to respond poorly.

If you buy another computer Id love to have yours. If the pcm is bad I like to play with them.
Reply
Old Dec 14, 2008 | 07:43 PM
  #10  
kirkjames90's Avatar
Thread Starter
Staging Lane
15 Year Member
iTrader: (5)
 
Joined: Oct 2007
Posts: 83
Likes: 0
From: Texas
Default

no LT's engine is completly stock besides the NGK plugs and msd wires

its never been tuned so its still the factory
Reply
Old Dec 15, 2008 | 01:23 AM
  #11  
BuffJoeyD's Avatar
TECH Regular
iTrader: (2)
 
Joined: Feb 2004
Posts: 426
Likes: 0
From: 1985
Default

It just sounds like the person attempting to diagnose your problem is just having you throw money at it. Why were all the parts listed changed, how did your mechanic decide what was to be replaced other than what you've listed as the problem. If you have the ability to diagnose these items, the likelyhood that one of the listed items was bad and then replaced, and you still have the problem sounds more like bad diagnosis.
Reply
Old Dec 15, 2008 | 03:55 AM
  #12  
TAQuickness's Avatar
TECH Junkie
iTrader: (28)
 
Joined: Jan 2004
Posts: 3,250
Likes: 1
From: Houston
Default

I've had a PCM die with similarly strange symptoms. Call Jess, get a PCM, if that don't fix it, you can sell it for what you paid or very close too. Not trying to knock anyones attempts to help you diagnose the problem - just answering your question.
Reply
Old Dec 15, 2008 | 08:04 AM
  #13  
Old Geezer's Avatar
TECH Senior Member
iTrader: (3)
 
Joined: Jun 2004
Posts: 5,639
Likes: 71
From: GA, USA
Default

So, what is shown on a datalog??
All kinds of parts thrown at the "problem", still no data to look at???
If your "tech" hasn't scanned/logged this, find another shop..
Reply
Old Dec 15, 2008 | 08:10 AM
  #14  
kirkjames90's Avatar
Thread Starter
Staging Lane
15 Year Member
iTrader: (5)
 
Joined: Oct 2007
Posts: 83
Likes: 0
From: Texas
Default

well i took it to the dealer and i should hear from them today
to clear things up though
most of the parts listed we did before we took it to the shop and they all showed a little improvement the only thing on the list we bought due to a scan was the o2's and the fuel pump
after replaceing the fuel pump the car ran perfect for a month or 2
then we had another problem and we replaced the crank sensor and it ran perfect for another month or 2 now its running like i said above so i took it to the dealer
will post up what they say today hopefully
Reply




All times are GMT -5. The time now is 06:22 AM.

story-0
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Slideshow: We take a close look at the ONE and Artidiag 800BT2 diagnostic tools from Topdon and the reasons to buy one over the other.

By Pouria Savadkouei | 2026-05-28 11:05:11


VIEW MORE
story-1
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Slideshow: The controversial Ferrari F6 swaps its original flat-12 for a Corvette Z06-derived LT4 V8 and sends power to four rear wheels through a custom-built drivetrain.

By Verdad Gallardo | 2026-05-26 18:23:54


VIEW MORE
story-2
7 Most Reliable High-Performance Engines GM Has Ever Built

Slideshow:These GM engines didn't just make huge power, they survived abuse, boost, track days, and six-digit mileage with a reputation for refusing to quit.

By Verdad Gallardo | 2026-05-21 16:45:27


VIEW MORE
story-3
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-4
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-5
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-6
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-7
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-8
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-9
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE