For anyone thinking of swapping to TBI.....

[Jims86]

Or may be thinking of installing true dual exhaust on a TBI truck.

This post is intended for anyone in my situation, where they have to pass emissions tests, and have swapped in a GM TBI system.
Since I have decided to stay with TBI, i have been chasing down a problem with the EGR system, throwing code 32.
Today I found the problem.
I am still running the dual cat exhaust, with magnaflow mufflers inline, and dual 2" tailpipes(like what came on the 86 trucks from the factory)
This exhaust configuration is entirely too free flowing for the TBI EGR system to work properly, as this particular EGR system is disigned to operate with the help of back pressure from the original single cat ehaust system, found on un-molested 87-95 GM light Trucks.
I have cured the problem by stuffing one of the tailpipes with tightly rolled shop rags....no code 32.
I have confirmed this by removing the rags, and then driving at 55 mph, and code 32 comes back up, when pressing on the accellerator to maintain speed.
I also noticed a tiny bit more of low end grunt with the tailpipe plugged up.

 

[Manbearpig]

 

[Jims86]

I know, i know......you dont have to pass emissions.

 

[Manbearpig]

Yeah I know

Hell I have an EGR valve glued to my intake to make it look legit

 

[RetroC10Sport]

I ain't even got an EGR...

 

[Swims350]

gettin the chip flashed would remove the code. LOL.

I got an 88 tbi truck and mines very free flowing, no egr on it, it's got a block off plate. shorty headers, no cats 2-1/4 pipes all the way back to chambered mufflers, and no tailpipes.

 

[Jims86]

Ok kiddo's
you forget, Im in california, and its not as simple as flashing the EGR out. They check everything for proper operation...on a dyno.

 

[Irishman999]

Ok kiddo's
you forget, Im in california, and its not as simple as flashing the EGR out. They check everything for proper operation...on a dyno.

*Commiefornia is what we call it over here.

 

[Jims86]

*Commiefornia is what we call it over here.

I keep tellin you guys! you cant call them communists! there would be better border security if that was what they are...i just call them tree huggers.

 

[Swims350]

lol you serious? I had no idea they went that in depth.

 

[Jims86]

lol you serious? I had no idea they went that in depth.

Yup, if it was as simple as just programming the code out, that would have been done long ago with the tpi. the last inspection, the guy was hooking up vac gauges to the cannister purge solenoid, and diconnected the egr solenoid to make sure it threw a code.

 

[Old77]

When they do inspections do they check for garage materials plugging up pipes???

I don't see how stuffing rags in your pipes to get the code to go away is any different than flashing the chip to get the code to go away??

 

[bucket]

I don't get it. I have an '88 TBI Burb. I put on true duals (w/headers too) and I gained low end grunt. Also it only throws an EGR code about once or twice a year, it actually would throw the code much more often with the stock exhaust and manifolds.

It's backwards. Your motor should be here in non-emissions Ohio, and my motor should be out there in Cali.

 

[RetroC10Sport]

I don't see how stuffing rags in your pipes to get the code to go away is any different than flashing the chip to get the code to go away??

Because they disconnect the EGR to make sure the code comes up. With flashing the chip, no code would come up and they would fail him.

 

[Jims86]

When they do inspections do they check for garage materials plugging up pipes???
Yes they do! I have to run a singl cat, so that will be changed before next inspection.
I don't see how stuffing rags in your pipes to get the code to go away is any different than flashing the chip to get the code to go away??

I just did it to see if it would make the code dissapear. I am half Bubba, so the shop rags were a natural choice for this diagnostic proceedure.

I don't get it. I have an '88 TBI Burb. I put on true duals (w/headers too) and I gained low end grunt. Also it only throws an EGR code about once or twice a year, it actually would throw the code much more often with the stock exhaust and manifolds.


It's backwards. Your motor should be here in non-emissions Ohio, and my motor should be out there in Cali.

I dont have headers, i have stock 86 exhaust logs....like a cummins manifold, minus 2 ports. headers are a big improvement, especially if they are small tube primaries.

Because they disconnect the EGR to make sure the code comes up. With flashing the chip, no code would come up and they would fail him.

We have a winner!