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Username Post: The dreaded code 32        (Topic#369077)
93headache 
Silver Supporting Member
Posts: 11
93headache
Reg: 07-30-22
07-30-22 10:36 AM - Post#2845151    

Hi all, I am having trouble finding a fix for my issue. The vehicle is a 1993 Chevy Silverado with a 4.3 engine. I have been getting everything on the truck repaired to make it my daily driver. So far, it has been a real learning experience. Sometimes replacing things that did not solve the problem, but yet I want to make this vehicle as bullet proof as possible.

Last week I replaced the fuel pump to eliminate a power loss issue while climbing hills on the highway or passing. The issue was fixed, however, since then I get a code 32.

Researching the problem, I find that there are 3 possible issues. One for a carb vehicle, one for an EGR equipped vehicle, and one for the MAP sensor equipped vehicle. My truck has throttle body injection.

Here's my problem. My truck has an EGR solenoid, but no EGR. Where the EGR should be, Is my coil. I cannot see where someone has blocked off the mounting area. The solenoid has an electrical connector to it, but no vacuum hoses.
I also have a MAP sensor, which I have replaced. The code still comes back. First off, I have to tell you I have no idea if this engine is the original or not. It runs strong, uses no oil, and seems like a solid motor. 245,XXX miles on the odometer.

I'm stumped as to why I only got this code after replacing the fuel pump.

As stated earlier, I have replaced almost everything else. Rotor, cap, wires, plugs, Ignition control module, O2 sensor, etc, etc. The list is almost endless.

Any help on how to proceed on this would be greatly appreciated.



 
Tony1963 
Frequent Contributor
Posts: 1597

Loc: Orlando Florida
Reg: 07-09-18
07-30-22 01:14 PM - Post#2845162    
    In response to 93headache

You should have used a scan tool to read the data stream and check for codes in the system BEFORE firing the parts cannon in an effort to spray parts at fixing your issue.

GM used an excellent system to run those engines.

I have loaned my old Snap On MT2500 scanner to people with vehicles of this vintage to do proper repairs. That's why I keep it for those older vehicles.

It is like working on an older computer with Windows 3.2 or something. You need the software.

Following the advice of Uncle Elmer and Cousin George will only result in cash flowing out of your wallet into the pocket of the parts store.

People fear change because it threatens what they know, or what they claim to know.


 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3995
Chevytech
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
07-30-22 07:47 PM - Post#2845186    
    In response to 93headache

If you can take a photo of the top of your engine, with the air cleaner off, and post it on the internet, and paste a link to it in a reply, it would be very helpful.

I don't think you can put a photo directly in a reply to the thread unless are a supporting member.


For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If your vehicle has been altered from stock, let us know about that too.


 
93headache 
Silver Supporting Member
Posts: 11
93headache
Reg: 07-30-22
07-31-22 10:52 AM - Post#2845215    
    In response to Tony1963

I appreciate your reply, but with the exception of the MAP sensor, everything else I replaced needed replacement. It's an old truck that needed a lot of TLC. I have been doing mechanical stuff since I can remember.

Having said that, I do not know anyone that has a scanner for this vintage, trust me, I have asked around.



 
93headache 
Silver Supporting Member
Posts: 11
93headache
Reg: 07-30-22
07-31-22 10:55 AM - Post#2845217    
    In response to Chevytech

Thanks. I will try to get that done this afternoon. I haven't really dug around the back of the intake I'll admit. In my mind, there is a blocked off port for the EGR. I just can't understand why I never had this code before replacing the fuel pump.



 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3995
Chevytech
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
07-31-22 11:09 AM - Post#2845219    
    In response to 93headache

  • 93headache Said:
... I just can't understand why I never had this code before replacing the fuel pump.

Because it is running better now.

Specific criteria / driving conditions must be met for a code 32 to get set.

Some people rarely hit the criteria and can drive for weeks before setting a code 32 even with the EGR unplugged.

Here is the info for a 1993 C/K TBI 5.0, 5.7 and 4.3L (s/t)
The actual test that sets the code 32 is done when:
-Throttle position is between 10% and 25% angle
-Steady throttle with no more then 2% change in throttle
-Above 32 MPH closed loop operation
-Max short term fuel trim less then 6 counts for 3.2 seconds
-desired EGR command greater then 40%
-MAP above 47.5 kPa or less then 15 kPa.

For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If your vehicle has been altered from stock, let us know about that too.


 
Tony1963 
Frequent Contributor
Posts: 1597

Loc: Orlando Florida
Reg: 07-09-18
07-31-22 11:59 AM - Post#2845225    
    In response to 93headache

I do. If you were in Florida close by I'd give you a hand.

People fear change because it threatens what they know, or what they claim to know.


 
93headache 
Silver Supporting Member
Posts: 11
93headache
Reg: 07-30-22
07-31-22 12:58 PM - Post#2845230    
    In response to Chevytech

Thank you very much! Now, that makes sense to me. I knew this was the site to join!

I will get the pics after I complete the seemingly never list of honey-dos that the boss has blessed me with today.

Edit to add: I just subscribed to the site, so hopefully I can directly download the pics now.



Edited by 93headache on 07-31-22 01:02 PM. Reason for edit: No reason given.

 
93headache 
Silver Supporting Member
Posts: 11
93headache
Reg: 07-30-22
08-01-22 04:10 PM - Post#2845295    
    In response to 93headache

I found my issue, but not sure how to proceed. As I stated from the start, I have no idea if this is the original engine or not. It's a 4.3 Vortec. The trans is a 4L60E, replaced about 2 months ago.

The EGR on this engine is the electric version, which is why my dumb butt thought there was no EGR. I have never seen one like that on a vehicle this old. Issue being, I believe this vehicle was set up for the vacuum version. I do not have an electrical connector for the EGR that's on the intake. There is an electrical connector going to the vacuum solenoid for the EGR.

Looking at both styles, I'm pretty dang sure that it's not a matter of replacing the electrical EGR with a vacuum EGR as the mounting looks different between the two. Is that correct?

Option 1. Electrical tape over the SES light. (seriously, just kidding)

Option 2. The gurus here can give me a fix short of replacing the intake. (fingers crossed here)

On a positive note, the truck is running awesome. Getting between 17.4 and 18.6 MPG over the last 6 tankfulls. Most of that was with the weak fuel pump.



 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3995
Chevytech
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
08-02-22 06:51 AM - Post#2845345    
    In response to 93headache

The electric EGR valve is referred to as a Linear EGR valve.

In 1993 the only light trucks with a Linear EGR system were:
Trucks with an automatic transmission AND:
4.3 liter with CMFI fuel system and S/T (aka S-10) or M van (aka Astro)
4.3 liter TBI fuel system M van (Astro) and C trucks (2 wheel drive) with Tier 1 Emissions

Linear EGR system parts are in no way interchangeable with negative back pressure EGR systems.

If everybody put their vehicle information in their signature so it shows at the bottom of every post it would help.
In this case the difference between an automatic transmission and a manual, and a two wheel drive or four wheel drive, makes a difference in which system is used.

The gross vehicle weight also makes a difference and if you don't know that at least put the series like 1500, 2500 or 3500.

There are so many posts I skip over because there is not enough vehicle information.

For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If your vehicle has been altered from stock, let us know about that too.


 
93headache 
Silver Supporting Member
Posts: 11
93headache
Reg: 07-30-22
08-02-22 10:15 AM - Post#2845348    
    In response to Chevytech

There are unknowns to me. I am a relatively new owner of this vehicle. Here is what I know:

C1500
2 wheel drive
4L60E auto transmission

I will post engine photos when I get home from work tonight.

I replaced the transmission with a rebuilt shortly after buying the truck. It appeared as though the trans had at least been removed prior to me buying the truck.
With 244xxx miles, I think it's possible this could be the 3rd one in this truck.

I am unsure if this is the original engine in the truck. Your guess is as good as mine. I have zero history on it. I essentially bought it as a project truck.




Attachment: 20220531_114923.jpg (4.35 MB) 1 View(s)






 
CowboyTrukr 
"11th Year" Silver Supporting Member
Posts: 4796
CowboyTrukr
Loc: Salt Lake City
Reg: 06-20-09
08-02-22 11:01 AM - Post#2845350    
    In response to 93headache

My ‘95 short step K1500 was born with a 4.3TBI.

It’s almost certain that this ruby beauty has the same.

Greg

‘01 Silverado 2500HD 8.1/Allison 1000 Xcab/LB
'00 Explorer XLT 4.0 SOHC V6 Auto
'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500 SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke


 
93headache 
Silver Supporting Member
Posts: 11
93headache
Reg: 07-30-22
08-02-22 04:19 PM - Post#2845357    
    In response to Chevytech

After digging around behind the engine, I found the wiring harness back there needs attention. All the wires are exposed. I will repair that asap. But, the good news is I found a connector hidden back there that MAY be the connector for the linear EGR. Can you tell me if indeed that what it is?

Attachment: 20220802_180736.jpg (2.57 MB) 1 View(s)






 
93headache 
Silver Supporting Member
Posts: 11
93headache
Reg: 07-30-22
08-02-22 04:24 PM - Post#2845358    
    In response to 93headache

A couple more pics:

Attachment: 20220802_181034.jpg (2.85 MB) 0 View(s)




Attachment: 20220802_180515.jpg (2.75 MB) 0 View(s)






 
93headache 
Silver Supporting Member
Posts: 11
93headache
Reg: 07-30-22
08-02-22 04:26 PM - Post#2845359    
    In response to 93headache

One more:

Attachment: 20220802_180606.jpg (2.43 MB) 4 View(s)






 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3995
Chevytech
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
08-02-22 05:10 PM - Post#2845361    
    In response to 93headache

  • 93headache Said:
One more:


The part between the PCV valve and the MAP sensor is a negative back pressure EGR solenoid.





For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If your vehicle has been altered from stock, let us know about that too.


 
Chevytech 
Subject Matter Expert - Senior Member
Posts: 3995
Chevytech
Loc: Twin Cities, Minnesota, U...
Reg: 04-25-04
08-02-22 05:14 PM - Post#2845362    
    In response to 93headache

  • 93headache Said:
After digging around behind the engine, I found the wiring harness back there needs attention. All the wires are exposed. I will repair that asap. But, the good news is I found a connector hidden back there that MAY be the connector for the linear EGR. Can you tell me if indeed that what it is?


It is common to find that unused connector on these trucks.
The Linear EGR wiring connector has five terminals in a row.
If it were my truck I would be looking for a intake manifold with a negative back pressure EGR valve at the U-Pull-It


For those of you that are wondering why you are not getting replies to your thread:

Did you give the model, year, engine, fuel system type, and transmission information?

If your vehicle has been altered from stock, let us know about that too.


Edited by Chevytech on 08-02-22 05:40 PM. Reason for edit: Add in photo link

 
93headache 
Silver Supporting Member
Posts: 11
93headache
Reg: 07-30-22
08-02-22 05:21 PM - Post#2845363    
    In response to Chevytech

Thanks for the info. I'll look around for an intake.



 
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