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I have a 1994 buick Lesabre 3.8 v-6. I am haveing problems ...

Sent to Car Experts January 19 08:43 PM

I have a 1994 buick Lesabre 3.8 v-6. I am haveing problems with finding out what these 2 OBD codes mean and how to troubleshoot them. PO629 and PO 361. Can you help me?

Optional Information:
1994 Buick Lesabre 3.8

Already Tried:
Cleaned the EGR Valve and new Gasket,# new Ignition Coils, Cam Sensor,Mass airflow sensor,new Computer, and Plug wires

Customer (name blocked for privacy)
Status:  Closed   Value: $8
Info Request
January 19 8:47 PM (3 minutes and 57 seconds later)
         
REPLIED to Info RequestCheck Mark
Do you have any symptoms along with the codes?

Master ASE Certified.L1 Advanced Engine Performance Certified.Pa Emission Repair Technician.Just Answer Car Category Mentor.
Davo -- Master technician -- 99% Positive Feedback on 1944 Car Accepts
ASE Master Technician/Advanced Automotive Diagnostic Technician
Reply
January 19 8:52 PM (4 minutes and 46 seconds later)
         
Reply to Davo/diablo666's Post: yes the car hesitates around 900 to 1300 RPMS but other wise runs fine..there are other codes too PO 406 EGR Error, PO 401 EGR Flow Failure, PO 361 EST line not toggling, PO 705 and Code PO 629. The car only has 49,000 miles on it and was sitting for a ling time before I have bought it 2 years ago. it ran fine. it even passed Pennsylvania Emissions inspection. I am ready to get rid of it.
Customer (name blocked for privacy)
Answer
January 19 8:58 PM (5 minutes and 46 seconds later)
         
ACCEPTEDCheck Mark
I would clear all of the codes and see if they reset.You have in your car what I call the infamous red,white and blue pcm.If you look at your engine control computer you will see red,white and blue connectors on it.They are every prone to failure and have been updated,Replacing the computer with an aftermarket computer may or may not fix the problem if the rebuilder is unaware of the update.If the codes reset I would replace the computer and remember to switch out the prom/mem cal from the old computer.If it were mine that would be the first thing I would have tried on that year.

Master ASE Certified.L1 Advanced Engine Performance Certified.Pa Emission Repair Technician.Just Answer Car Category Mentor.
Davo -- Master technician -- 99% Positive Feedback on 1944 Car Accepts
ASE Master Technician/Advanced Automotive Diagnostic Technician
Reply
January 19 9:03 PM (5 minutes and 34 seconds later)
         
The Computer was replaced about 5 months ago. The car just quit running..had spark and no fuel. had 36 pounds of fuel pressure. I have reset the code. I have a snap on MT 2500. where do I get the updated computer?
Customer (name blocked for privacy)
Reply
January 19 9:06 PM (2 minutes and 47 seconds later)
         
I used the PROM from the old Computer when I did the computer swap.
Customer (name blocked for privacy)
Answer
January 19 9:08 PM (1 minute and 48 seconds later)
         
ACCEPTEDCheck Mark

Where did you get the computer?Also check the ground under the coil and module mounting bracket.



Edited by diablo666 on January 19 2006 at 9:09 PM

Master ASE Certified.L1 Advanced Engine Performance Certified.Pa Emission Repair Technician.Just Answer Car Category Mentor.
Davo -- Master technician -- 99% Positive Feedback on 1944 Car Accepts
ASE Master Technician/Advanced Automotive Diagnostic Technician
Reply
January 19 9:09 PM (52 seconds later)
         
It had the same miss before the computer was replaced. It was replaced with a rebuilt one from auto zone. what is the code PO 629? It says invalid pass key Frequency
Customer (name blocked for privacy)
Answer
January 19 9:14 PM (5 minutes and 24 seconds later)
         
ACCEPTEDCheck Mark
It's actually P1629 and it is almost always a bad computer in my experience.That is a theft deterrent code.If the key was incorrect the engine shouldn't even crank.If it does it should start and stall with that code.Aftermarket computers will not always fix those cars.You may need to spring for a GM rebuilt.Check the ground under the coil/module mounting bracket.Where are you in Pa?If you are close I could lend you a known good test computer.

Master ASE Certified.L1 Advanced Engine Performance Certified.Pa Emission Repair Technician.Just Answer Car Category Mentor.
Davo -- Master technician -- 99% Positive Feedback on 1944 Car Accepts
ASE Master Technician/Advanced Automotive Diagnostic Technician
Reply
January 19 9:16 PM (1 minute and 51 seconds later)
         
I am in North Side but work in east liberty.
Customer (name blocked for privacy)
Reply
January 19 9:19 PM (3 minutes and 5 seconds later)
         
This car is driving me nuts...I have fixed a lot of cars my self also a former mechanic of a Dodge dealer.
Customer (name blocked for privacy)
Answer
January 19 9:25 PM (5 minutes and 36 seconds later)
         
ACCEPTEDCheck Mark
If you would be willing to come to Natrona Heights to borrow the computer you can try it and see if the idle settles down and the codes go away.One thing to try is to disconnect the idle air control valve and see if the hesitation goes away.Unplug it with the engine at a normal idle and then raise the engine speed up and see if it still does it.

Master ASE Certified.L1 Advanced Engine Performance Certified.Pa Emission Repair Technician.Just Answer Car Category Mentor.
Davo -- Master technician -- 99% Positive Feedback on 1944 Car Accepts
ASE Master Technician/Advanced Automotive Diagnostic Technician
Reply
January 19 9:29 PM (4 minutes and 6 seconds later)
         
I am tired of sinking money into the car and tring to guess what is wrong. I am willing to take a ride to natrona heights...which is not very far
Customer (name blocked for privacy)
Reply
January 19 9:31 PM (1 minute and 57 seconds later)
         
I robbed a bunch of eletronics from a car at U-Pick-It Junkyard and even have a spare one of those
Customer (name blocked for privacy)
Reply
January 19 9:36 PM (5 minutes and 37 seconds later)
         
I am working saturday and got plans for sunday early ..got to watch those steelers win
Customer (name blocked for privacy)
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