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Pampered-Z · 07-03-2007, 09:19 AM

Yes, the ODBI LT1s do run on the rich side in the upper RPMS, but you would need to reprogram to resolve the problem. Changing FP will have no effect as the ECM will just compensate by adding injector pulse to richen it back up.

Weak O2 sensors can also cause the car to run a bit richer and the OBDI ECM is more tolerant of this before it will throw a code. You would need to scan the car and look at the LBs,IPs and O2s to see if the ECM is compensating. Also make sure the EGR is functioning properly. Over time carbon builds up in the intake track and could result in the vavle not closing completely or the port being blocked.

Upgraded ignition does have allot of good benefits; the early LT1s do have weaker coils then the later 95 models. I run the Eccel 300+ igin. It has a hotter then stock coil and also "double sparks" at lower RPMs (this is switches to single spark around 4,000RPMS). Which is said to help ignite any unburned fuel and help with bottom end power and lower emissions.

JB

07-03-2007, 09:19 AM	#4
Pampered-Z Sliderule / Moderator Join Date: Oct 2004 Location: Catawissa PA Posts: 2,294 iTrader: (1)	Yes, the ODBI LT1s do run on the rich side in the upper RPMS, but you would need to reprogram to resolve the problem. Changing FP will have no effect as the ECM will just compensate by adding injector pulse to richen it back up. Weak O2 sensors can also cause the car to run a bit richer and the OBDI ECM is more tolerant of this before it will throw a code. You would need to scan the car and look at the LBs,IPs and O2s to see if the ECM is compensating. Also make sure the EGR is functioning properly. Over time carbon builds up in the intake track and could result in the vavle not closing completely or the port being blocked. Upgraded ignition does have allot of good benefits; the early LT1s do have weaker coils then the later 95 models. I run the Eccel 300+ igin. It has a hotter then stock coil and also "double sparks" at lower RPMs (this is switches to single spark around 4,000RPMS). Which is said to help ignite any unburned fuel and help with bottom end power and lower emissions. JB __________________ 93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada 1) Build it 2) Race it 3) Break it 4) Repeat!!!