help with LT1 engine - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 07-15-2010, 02:11 PM
Registered User
 
Join Date: Jul 2010
Location: TUCSON AZ
Age: 27
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
help with LT1 engine

i just biught a 1994 LT1 engine from a buick road master i need wiring harness and ecu i found one for $200 from junck yard it out of 1995 caprice cop car 94 is OBD1 i checked acouple chevy dealerships and 3 siad it would work and 2 siad it would not that the 95 is OBD 2 can any one help please and thankyou

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 07-15-2010, 05:55 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: Found an LQ9 today
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 41
Posts: 5,230
Wiki Edits: 16

Thanks: 14
Thanked 10 Times in 7 Posts
95 is still OBD1. There is a rumor out there that the late 95s went with OBD2 but I have yet to see one.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 07-15-2010, 06:19 PM
T-bucket23's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Engine basic condition - how to check Last photo:
Join Date: Aug 2005
Location: Massachusetts
Age: 57
Posts: 5,336
Wiki Edits: 26

Thanks: 7
Thanked 143 Times in 127 Posts
Quote:
Originally Posted by curtis73
95 is still OBD1. There is a rumor out there that the late 95s went with OBD2 but I have yet to see one.
There were actually a hand full of 93-95 cars that were OBDII compliant.
__________________
Artificial Intelligence is no match for Natural Stupidity



Chet
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 07-15-2010, 06:43 PM
Registered User
 
Join Date: Jul 2010
Location: TUCSON AZ
Age: 27
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
LT1 help

how do i tell if my LT1 is OBD1 or OBD2? thanks
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 07-15-2010, 07:33 PM
OLNOLAN's Avatar
Registered User
 
Last photo:
Join Date: Apr 2009
Location: Louisiana
Posts: 1,074
Wiki Edits: 0

Thanks: 429
Thanked 111 Times in 92 Posts
Links

Hey JD, Here's some links to get you started in LT1 swaps. I haven't completed mine yet cause of lack of funding. Food for thought;
http://www.lt1swap.com/
http://www.google.com/search?sourcei...207&q=lt1+tech
http://shbox.com/1/schematics_wiring.html
http://www.pcmforless.com/
olnolan
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 07-16-2010, 06:50 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 7,025
Wiki Edits: 0

Thanks: 4
Thanked 516 Times in 436 Posts
Quote:
Originally Posted by Jimmy Dean King
i just biught a 1994 LT1 engine from a buick road master i need wiring harness and ecu i found one for $200 from junck yard it out of 1995 caprice cop car 94 is OBD1 i checked acouple chevy dealerships and 3 siad it would work and 2 siad it would not that the 95 is OBD 2 can any one help please and thankyou
LT1's went to OBD 2 before the mandate year of 1996.

Coming from a Buick, your LT1 might not be the 350 but rather the 262 inch L99. You need the casing numbers to be sure if you don't already know. Both look identical on the outside.

Bogie
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 07-17-2010, 12:11 AM
Registered User
 
Join Date: Jul 2010
Location: TUCSON AZ
Age: 27
Posts: 7
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Lt1

befor i bought it i checked on the back lip where the trans bolts up and it has a 5.7 casting on it and the casting number show LT1 but thanks for lookin out how do i tell if mine is obd 2 or obd 1 it a 94 thanks james
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 07-18-2010, 09:00 PM
Silverback's Avatar
Boost Retard
 
Last photo:
Join Date: Mar 2007
Location: DC Metro
Posts: 379
Wiki Edits: 0

Thanks: 1
Thanked 2 Times in 2 Posts
The '95's got the OBDII connectors, but still had OBDI ecms. The only possible exception might be the CA emissions ones. I know that '95 CA emissions f-bodies got the '96 and up emissions package, and they all had the OBDII connector, so I wouldn't be surprised to see an OBDII PCM setup, but I doubt it.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 07-18-2010, 10:33 PM
Member
 
Join Date: Nov 2001
Posts: 447
Wiki Edits: 0

Thanks: 0
Thanked 11 Times in 10 Posts
Lt1?

Check to make sure you have a LT1 350. I beleive they also intalled L99 265 engines into the Buicks. Better check the casting numbers to make sure you don't have the baby lt1. Externally they look the same.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 07-20-2010, 11:11 PM
Silverback's Avatar
Boost Retard
 
Last photo:
Join Date: Mar 2007
Location: DC Metro
Posts: 379
Wiki Edits: 0

Thanks: 1
Thanked 2 Times in 2 Posts
The 4.3 has a 43 cast into the side of the block..
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 07-21-2010, 09:28 AM
Registered User
 
Join Date: Jun 2010
Location: VA
Posts: 38
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Vin #s are stamped on the block in the back. I would say that is your best bet in finding the data you want. Also I think the Mas air flow motors are ODB2 and the ones without a mass air flow are the speed density ODB1. I'm assuming your motor has iron heads? Wish I could help more i know more about the F body cars.

Last edited by Tyler007; 07-21-2010 at 09:34 AM.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 07-21-2010, 09:40 AM
Registered User
 
Join Date: Jun 2010
Location: VA
Posts: 38
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Not sure what the motor is going in but you can carb a lt1 if you want to get away from the computer.

Found this for you I don't think its a ODB2
http://en.wikipedia.org/wiki/Buick_Roadmaster
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 07-21-2010, 11:15 PM
Silverback's Avatar
Boost Retard
 
Last photo:
Join Date: Mar 2007
Location: DC Metro
Posts: 379
Wiki Edits: 0

Thanks: 1
Thanked 2 Times in 2 Posts
arggggg...

all the b-body LT1's were mass air with a MAF, but they also all had a MAP (used for testing the operation of emissions devices and I believe for limp home)

Last edited by Silverback; 07-24-2010 at 10:39 PM.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 07-22-2010, 08:05 AM
Registered User
 
Join Date: Jun 2010
Location: VA
Posts: 38
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
1993 LT1 Camaro’s had no mass air flow. They were just a speed density systems I know this because I had one.

Last edited by Tyler007; 07-22-2010 at 08:12 AM.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 07-22-2010, 10:41 AM
OLNOLAN's Avatar
Registered User
 
Last photo:
Join Date: Apr 2009
Location: Louisiana
Posts: 1,074
Wiki Edits: 0

Thanks: 429
Thanked 111 Times in 92 Posts
Lt1 Evolution

I hate to add to the confusion but, the LT1 was changed alot before it died off.

I (wife's hotrod) own a '94 Camaro with MAF sequential port injection that has OBD1. So the presence of a mass airflow sensor does not necessarily indicate OBD2.

I also own a '97 Camaro LT1 that is most definitely OBD2 MAF sequential port injection.

To the best of my knowledge, '92/'93 Vette and '93 Camaro were MAP, speed density, batch fire systems. '94 and up Vettes and Camaros were MAF sequential port injection, but not switched to OBD2 until '96.

'96 and up saw the addition of a crank position sensor to enable misfire diagnostics required for OBD2 systems.

To the Sausage King, In my opinion if your '94 Buick engine has a MAF sensor and the '95 Chevy cop car engine has a MAF sensor, then they are both likely are set up as OBD1 sequential port injection and it will be a plug and play. If your '94 Buick engine has no MAF sensor, then it was set up as OBD1 batch fire and the '95 Chevy cop car stuff may be different. If yours is batch fire then you would be better off finding a donor harness and PCM from the same. I think there was a coil and coil wiring change also.

Street and Performance http://www.hotrodlane.cc/ has stand alone harnesses and PCMs for both systems and if I remember correctly, they recommend switching to batch fire and the early PCM to eliminate the air restriction of the MAF sensor for performance use and a simpler wiring harness.

There are multiple sources for harnesses and computers if you use the links I supplied you previously. The answer to your setup is as easy as a call or email to these guys, as they have swapped them many times and have all the required components.

I am using a donor harness on an LT1 swap presently and if I had known how much damaged wiring and sensors were going to be there, I would have bought a stand alone harness and PCM a long time ago. I'm into it too far to back out now unfortunately. Food for thought.

IMHO, olnolan

Last edited by OLNOLAN; 07-22-2010 at 11:02 AM. Reason: LINK
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
crate chevy 302? Vancouver Grand Prix Hotrodders' Lounge 106 12-31-2012 05:05 PM
the history of chevy v8's savman1 Hotrodders' Lounge 43 03-02-2012 07:57 PM
SBC 350 superiority rebuttle...was:POWERED BY CHEVY, WRITTEN ON A FORD, (from 'Engine Oldsmolac911 Hotrodders' Lounge 50 01-12-2011 11:00 PM
1985 C-6 truck tranny, no engine braking effect fast68 Transmission - Rearend 40 02-04-2008 06:55 PM
Chev LT1 350 engine front accessory clearance haysbo Engine 2 09-02-2007 08:13 PM


All times are GMT -6. The time now is 01:46 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.