last night i deleted the egr valve in my 89 gta 5.0tpi using a block off plate from tpiparts.net. i blocked off the vacuum line at the throttle body(underneath), and blocked off the lines from the egr selenoid. Now the car will not hold idle and it backfires and pops when gas is applied. Any suggestions? I did this because i was tired of getting egr codes and poor performance outta my vehical. any help would be appreciated

 

WOW. You introduced yourself a crap load of problems. The easy solution is to replace everything that you did. In order to delete the EGR properly and permanantly is to reprogram the MemCal. That'll cost you a lot of money. Or you can buy a G1 moates adapter along with a blank EPROM and have someone program the EPROM with the same bin file of your current PROM. The proceedure is easy IF you have the bin file programming software which is free (TunerPro). But you'll still need to buy a circuit board that allows you to insert the EPROM to connect into the PC. What a programmer will do is max out (IIRC) the EGR temp which is in celcius. It's not in a sence deleting the EGR system, but rather tricking the ECM into thinking that the EGR is operating like its supposed to. Removing the EGR vavle is risky though. When the EGR Valve opens, it allows exaust to enter the combustion chamber. This exaust helps keep the upper cylinder cool. If the upper cylinder gets too hot, you can run the possibility of detonation, ping, and engine knock which can destroy your block. And even if your block doesnt take a dump, the knock sensor will retard the spark which can result in a loss of HP. I got a friend here on the message board that can probably help you with the programming of a blank EPROM. he did my EPROM.

 

I don't think you have an EGR problem. It sounds like you goofed something else while working on it. Check for vacuum leaks and/or crossed plug wires.

 

I'm with those two!

 

well to explain more in detail. The reason i installed the block off plate is because the egr is bad and the egr selinoid has chewed up wires so i took the easy route to get it running. It was stumbling and low on power and throwing codes for egr and egr wire. Is there something i should do with the egr selinoid? or just block off all the vacuum lines? and remove the power wires to the selinoid?

 

The vacuum operated EGR cannot communicate with the computer so an EGR code is not saying the EGR valve itself is bad. What your light was saying is that there is a problem with the EGR solenoid circuit. Your chewed up wires confirm that.
The thing to do would have been to fix the wires.

Disconnect the solenoid and you should still get a service engine light because the computer sees a problem.

Now as for your running condition, you need to go over what you did. I'm sure you had to have taken the plenum off to get to the TPI. Got a leak? Forget to hook something back up???

 

Is this your daily driver? Do you do annual smog tests? I don't know for sure but I may be wrong, but I think you'll need it to pass your emissions test.

 

Will certainly increase NOx on the dyno without it if the OP does test.

 

it is my daily driver..but no smog test. i recheched everything..repulled the plenum..no leaks.. however. i do have a hypertech chip in the ecm..thinking about that maybe this is why its backfiring and popping. Im going to install my stock chip and see if this makes a difference before i pull the plenum again. ANOTHER QUICK QUESTION...Do i remove the solenoid(egr) completely or does the vacuum from it control something else as well.. I also noticed lil brake pressure after the block off install? does this mean low vacuum somewhere

 

What sort of sealer did you use for the block-off plate?
Did you fill the exhaust feed side with something?

 

Ok here is what I did. I d
Sealed the block off plate with rtv gasket sealer. I plugged the line coming off the throttle body(bottom side rear port) I plugged the lines comming off the egr solenoid. i left all the vacuuum lines attached to their original place with the exception of the egr valve of course because its no longer there. iplugged the lines for easy installation later if i go back to the valve. i then reinstalled the plenum and all remaining hoses. i did not remover the egr solenoid just plugged the lines from it and i did not unplug the electrical connector. could that be part of the problem. i thought maybe the hypertech chip had something to do with it because of the timing curve set in it but i

 

Ok here is what I did. I d
Sealed the block off plate with rtv gasket sealer. I plugged the line coming off the throttle body(bottom side rear port) I plugged the lines comming off the egr solenoid. i left all the vacuuum lines attached to their original place with the exception of the egr valve of course because its no longer there. iplugged the lines for easy installation later if i go back to the valve. i then reinstalled the plenum and all remaining hoses. i did not remover the egr solenoid just plugged the lines from it and i did not unplug the electrical connector. could that be part of the problem. i thought maybe the hypertech chip had something to do with it because of the timing curve set in it but i

 

Ok here is what I did. I d
Sealed the block off plate with rtv gasket sealer. I plugged the line coming off the throttle body(bottom side rear port) I plugged the lines comming off the egr solenoid. i left all the vacuuum lines attached to their original place with the exception of the egr valve of course because its no longer there. iplugged the lines for easy installation later if i go back to the valve. i then reinstalled the plenum and all remaining hoses. i did not remover the egr solenoid just plugged the lines from it and i did not unplug the electrical connector. could that be part of the problem. i thought maybe the hypertech chip had something to do with it because of the timing curve set in it but i

 

It's not your chip causing the new problem.
All you had to do was plug the vacuum hose that went to the EGR valve only.
I hoped you used high-temp RTV because exhaust heat comes directly up to the valve area. It will probably quickly burn out your blocking plate gasket.

 

So you are saying just plug the line to the egr valve ONLY? do not touch the edg solenoid? do not disconnect the power to the solenoid? I have a prom on order now and want to get it ready for when it arrives.

 

Id get it all working rather than bypass parts because they need attention.
EGR helps TPI motors, doesnt hurt them nor does it make it any faster. Cleans things up a bit thats all.

 

The control solenoid is on an actuator circuit, not a sensor circuit. It doesn't matter what you do with it.
If you don't want the ECM doing the EGR diagnostic test then just turn off that flag on your EPROM.