Sounds like something elce is off. If you basicly gave it a big vac leak(open breather on line) and it runs better, something is wrong elcewhere.

 

As long as the EGR valve is not allowed to open, or if you have an EGR failure code, the system will automatically delete/bypass the EGR function with no other driveability problems or effects on A/F control or spark advance. Set the system the way it's supposed to work (no vacuum to the BP sensor), and run the DIY KOEO/KOER/Cylinder Balance Self-Test ......it is the only way you will be able to id what else could be wrong.

 

Being that this engine is a transplant, I won't be able to run any diagnostics. It has no 02 sensors, smog pump deleted, etc.

 

why does it have no O2 sensors???? you wonder why it runs like ****...

 

I bought it like that. It has headers to pipes with no 02 sensors. Air pump pipe from exhaust was capped. All smog stuff removed an/or capped. The car was an 87LX, but already had the MAF wiring. EGR was capped but not unplugged. Edelbrock performer intake.

This is the dilemma. It either needs to be all computer controled or no computer control at all. Right now, it is mixed. However, it does run VERY good right now. I was just curious if the EGR caused all the problems to start.

 

Not having the O2s will not cause any problems (provided there are no problems with other components)....and it shouldn't be a cause for the self-tests not to be accessed, you would only see the O2 related codes (41/91 or 42/92). As a matter of fact, any other problem in the system (BP, ECT, ACT, etc) will cause problems, since they are the ones used by the computer to "estimate" the O2 readings.....part of the "limp-mode" strategy your car is running under right now.

 

Well, I hooked that intake vacuum hose back to the vapor canister and it runs great like before. The BAP is now unvacuumed. That means the plugged-in EGR was the cause for all this mess.

 

something is really wrong here, egr will cause problems only if it is open all the time, it is supposed to open when at cruise to drop engine combustion chamber temperatures so it can reduce the forming of nox emissions. If egr has direct vaccume and it is on you will feel it run like crap on idle and poor acceleration. Not having o2 sensors is a big problem because you are running a computer controlled vehicle, the computer needs the input from the 02 to adjust a/f accordingly, if you dont want all that then go carburated or fix the car right put the 02s on my 2c's