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OBD 1 experience's with EGR solenoids?

Crankme69

Crankme69

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Has anyone tried to unplug the power & remove the vacuum from both EGR solenoids with stock chip on 1995 OBD1?

I did a little experiment with mine & it appears to throw a SES EGR code that clears shortly like 10 sec after startup? That would be fine with me, as long as it creates no other known issues that are going to lead me in the wrong direction.

I am hoping someone has some feedback for me, because mine has been acting goofy and I'm trying to eliminate as many potiential electrical sources as possible that feed the IGN A 20 amp fuse circuit.

TIA
 
If you throw a code 31 the ecm will just shut down the egr system. Same goes for 32.
Have you checked for the 5 volt reference signal on the gray wire of the baro sensor on the firewall next to the hydra-boost? The same reference is used by several of the sensors[easy one to check also]. There is a way to test the baro sensor also.I'd have to look that up. With gmtd scan tech you should be able to see what the sensors are reading.
 
I put an "F" vin intake on my 1500 knowing my GL4 was combing. It drove fine ses came on and off but that's it
 
As of today, I am currently running with both EGR solenoids unplugged from the puter & also both EGR solenoids are isolated from the vacuum system.

The Baro sensor wire plug harness is plugged into the computer but not hooked up to any vacuum solenoids.

The Baro sensor is brand new & the wastegate solenoid is also brand new.

The SES light does stay on most of the time unless off the throttle coming to a stop then it clears momentarily? When it clears the baro sensor indication that I can read in GMTD Scan tech will jump to normal 13.7 then when I get the SES light it drops to 11.2...?

That baro reading jumping leads me to believe I have a wiring issue or short somewhere…?

I cleaned the ground on the driver’s side rear of the intake manifold & removed each fuse from fuse box under the hood one at a time sprayed electronic contact cleaner lightly & blew them all out before reinserting them.

This erratic Baro sensor reading, maybe normal with the way I have things isolated but I would not think so...anyone know if I'm chasing a ghost here???

Longer term plan is to get a chip after I change out my S intake with an F and install gauges & maybe new exhaust…so I am not going to spend money on either EGR solenoids, that would be a waste…
 
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No one has ever tried to unplug their EGR solenoids?

I will do more checking tomorrow, like power to Baro & to the other solenoids & such, but I'm a tad out of my league with electrical stuff & it's supposed to rain here tomorrow :>(
 
Crankme69 said:
No one has ever tried to unplug their EGR solenoids?
Click to expand...

Sorry Crankme... wish I could help. Had F engines only. Everybody I knew that had S engines changed 'em over (or frost-plugged 'em) at the first sign of trouble or when they reflashed.
 
What is usually done to delete the egr is a plate is put under the egr valve and/or a frost plug is put in the egr tower. Then the vac line going to the egr is plugged off. All other vac lines are left in service as well as electrical connections. This is the only way to disable the egr and not code that I'm aware of.
 
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