For those of you with a 95 blazer/jimmy/s10/sonoma/bravada with ECM under the hood

[rlith]

Well, my fuel pump and sender unit took a dump on me last night, I was not going to drop a tank in this weather so I let my dealership do it. The guy who was the tech on it is really cool. (I've dealt with him before). He updated my ECM for free using the Tech 2 unit they have. Wow. I was about 9 upgrades behind. This is what was corrected in the ECM. Granted, I've not really had an issue with most of this, but it's nice to know that I won't. And part of the reflash was to make my ECM FULLY ODBII compliant! Yay!

09378485 New Calibration for specical policy 99046. EGR carbon build up, EGR air mixture, and fuel delivery adjustments

09360011 New Calibration to correct false setting of code P0401 Exhaust Gas Recirculation Flow Insufficient Detected

16202232 Used on vehicles with telecommunication interference bulliten number 569603a

09360028 New calibration for special policy 99046 for drivability and fuel economy

16188953 Speedometer Calibration

16206788 Enhanced transmission pressure switch data file diagnostics and improved shifting.

16251376 New Calibration to correct surge, knock, rough idle, stall, IAC, DTC 1406. Bulletin number 666507

16227653 New Calibration to enable full ODB 2 capabilities and diagnostics for U.S. use only.

With the reflash I can definatly feel a difference in the driveability.... And the fact that I tested it with a full ODBII scanner and got full feedback to the unit was pretty cool.

[BlazerLT]

Nice, I think I might drop by and see if they have any updates.

The IAC issue I have experienced in the past and this could be the solution.

[Viol8tor]

Originally Posted by BlazerLT

Nice, I think I might drop by and see if they have any updates.

Will a dealership do these updates to the ECM for free? If not, how much will they charge fopr this? How do you go about getting just the updates done with no other work purchased from them?
I am having a repeated stuck EGR valve problem and want to make sure I get all of the updates.

[BlazerLT]

Originally Posted by Viol8tor

Will a dealership do these updates to the ECM for free? If not, how much will they charge fopr this? How do you go about getting just the updates done with no other work purchased from them?
I am having a repeated stuck EGR valve problem and want to make sure I get all of the updates.

No, they will charge you for the updates. I don't know how much though.

Take a look at several dealerships to se what the price range is.

The stuck EGR is from Carbon keeping the EGR pintle blocked open and is the sign of a CPI injector leaking.

[rlith]

Originally Posted by Viol8tor

Will a dealership do these updates to the ECM for free? If not, how much will they charge fopr this? How do you go about getting just the updates done with no other work purchased from them?
I am having a repeated stuck EGR valve problem and want to make sure I get all of the updates.

Reflash is usually about 50-60 bux... As far as the EGR is concerened, do what blazerlt said and simply pull it and clean it.. The updates available depend on a couple of things. First being you have the ecm under the hood and not the dash. Secondly if you have had the ABS recall done on your truck they will have done a few of these. Simply just go up to the local dealership and tell them you want the latest flash for your ecm... Will take them about a 1/2 hour to get you in or out...

[Viol8tor]

Originally Posted by BlazerLT

The stuck EGR is from Carbon keeping the EGR pintle blocked open and is the sign of a CPI injector leaking.

Thanks for the reply. Can you please give some more info or details on the stuck EGR being an indication of a leaking CPI injector? I am not sure how the 2 correlate.

Thanks in advance!

[Viol8tor]

Originally Posted by rlith

Reflash is usually about 50-60 bux... As far as the EGR is concerened, do what blazerlt said and simply pull it and clean it.. The updates available depend on a couple of things. First being you have the ecm under the hood and not the dash. Secondly if you have had the ABS recall done on your truck they will have done a few of these. Simply just go up to the local dealership and tell them you want the latest flash for your ecm... Will take them about a 1/2 hour to get you in or out...

Thank you for the reply & info as well. I did pull the EGR and clean it, and it fixed the problem but it re-clogged with carbon less than a day later. I knocked on it with a metal bar while it was still installed at that seemed to release the carbon object that was sticking the pintle and it solved the problem again, but I am not sure how quickly it will get stuck again.

The ECM is under the hood in my truck (it is a 95 LT with CPI) so it can be updated. When was the ABS recall (roughly what date was it announced) and what campaign was it? I don't recall anything about that at all, so I am not sure if it was performed or not. If I request the latest flash for the ECM, will they do all of the other updates, or just the latest. In other words, is the latest flash update cumulative and include all the available updates, or must all of the other updates be done as well?

Thanks again!

[rlith]

What he was talking about is if you're dumping too much fuel, it runs rich,m thereby creating more carbon... When you pull the EGR and clean the port on the manifold itself, run it without the EGR for a minute or 2 and rev it to around 4000 to blow out any loose carbon that fell back in the intake...

The abs recall was around 96 or 97 I believe, all safety recalls are FREE regardless of the year. Simply call your local dealership's repair department and give them your VIN number and they will see what recalls have been performed/not performed on your vehicle. Yes the latest flash is culmative with all previous issues included with it.

[blazee]

Must be nice to have a local dealer that is helpful. The one near me is a huge pain in the ass to deal with, so I go to the next one which is 45 miles away. The guys around here are lazy dumbasses, I found a recall on Impala SS's so I had my wife call up and ask if mine was affected.

She gave the guy the VIN and he said, "That car is a Ford, you need to call the Ford dealer."
She said, "no it is a Chevy Impala SS."
The guy said,"Okay let me check again."
She told him the VIN again and he said ,"OPPS, you were right it IS a Mercury, but you still need to call the ford dealer."



She called again a few monthes later for a fuel filter for the Blazer and he said that it was part of the motor and they had to replace it.

There have been many other problems with those guys. Usually they treat her like an idiot when she deals with them. (hard to believe they treat women like that...the dealership belongs to a woman) And they always give me the wrong parts. So no more Cindy Brooker Chevrolet for us.

[rlith]

Originally Posted by blazee

Must be nice to have a local dealer that is helpful. The one near me is a huge pain in the ass to deal with, so I go to the next one which is 45 miles away. The guys around here are lazy dumbasses, I found a recall on Impala SS's so I had my wife call up and ask if mine was affected.

She gave the guy the VIN and he said, "That car is a Ford, you need to call the Ford dealer."
She said, "no it is a Chevy Impala SS."
The guy said,"Okay let me check again."
She told him the VIN again and he said ,"OPPS, you were right it IS a Mercury, but you still need to call the ford dealer."



She called again a few monthes later for a fuel filter for the Blazer and he said that it was part of the motor and they had to replace it.

There have been many other problems with those guys. Usually they treat her like an idiot when she deals with them. (hard to believe they treat women like that...the dealership belongs to a woman) And they always give me the wrong parts. So no more Cindy Brooker Chevrolet for us.

You should call and ask for either the owner or General manager and tell them the same thing... Usually if they know that kind of crap is happening they will put a stop to it...

[blazee]

I haven't called to complain about it. I know others who have had problems and nothing changed when they complained. I've heard that the repair dept. manager is the problem, but I doubt he is the only one, because I don't think he would be the one answering the phone everytime we call.
On the bright side, the guys at Cecil Clark Chevrolet 45 miles away are good to deal with.

[BlazerLT]

Originally Posted by Viol8tor

Thanks for the reply. Can you please give some more info or details on the stuck EGR being an indication of a leaking CPI injector? I am not sure how the 2 correlate.

Thanks in advance!

The leaking injector will cause some of the cylinders to run a little more rich do to increased fuel seeping into some of the cylinders.

This will cause carbon buildup which will eventually break off and block open the EGR valve.

Also, I will note, my fuel economy dropped 1-2 mpg when I had my ECM flashed with the latest updates.

I don't know why, but I did see a drop.

[Viol8tor]

Originally Posted by BlazerLT

The leaking injector will cause some of the cylinders to run a little more rich do to increased fuel seeping into some of the cylinders.

Thanks for your input.
Is there any decent way to determine if you have a leaking fuel injector or fuel pressure regulator by using a Super Scan Tool to monitor or test it?

Originally Posted by BlazerLT

This will cause carbon buildup which will eventually break off and block open the EGR valve.

I cleaned the EGR very well 2 nights ago, and within a day the SES light came back on and the EGR was clogged again. I tapped on it with a metal bar while still on the truck and was able to dislodge the carbon clog, but it came back within a very short time.
I am just about to pull the EGR off and give it another complete cleaning, and this time I will quirt some carb cleaner inside the exposed ports on the engine and run it for a bit without the EGR to try and clean out any loose carbon that is in the port. I am also going to use the Klean Screen gasket on the EGR when it goes back on to help prevent another clog.

I will also probably get my ECM flased with the latest updates as well.

How does that sound? Do I have all bases covered with this EGR problem then?

Thanks again!

[BlazerLT]

The carbon is caused by the leaking cpi injector.

Remove the top IMTV valve and take a look inside the upper plenum and look for pools of gas and washed spots which will be yellow.

You cannot check for a leaking CPI injector through a scan tool.

Fix the cause of the problem and the EGR problem will go away.

[Viol8tor]

Originally Posted by BlazerLT

The carbon is caused by the leaking cpi injector.

Remove the top IMTV valve and take a look inside the upper plenum and look for pools of gas and washed spots which will be yellow.

You cannot check for a leaking CPI injector through a scan tool.

Fix the cause of the problem and the EGR problem will go away.

Thanks again. Sorry, but what is the IMTV valve?
What is the best way to repair the leaking injector problem, to replace the injector, whole CPI unit, fuel pressure regulator, etc?
What items would I need to buy and replace?

Would the leaking CPI injector most likely be the reason that I just had to replace a fully plugged Catalytic converter as well?