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I do have the manuals. I suck at using them! I am thinking EGR because I have replaced just about everything else I can think of. Injectors, opti, cat, O2 sensors, maf, vacuum lines, plugs, wires, and probably some more stuff that I have forgotten!

Hi all, My 92 LT1 failed inspection for the 2nd time.....high nox. I am thinking it is EGR related, as I have replaced everything else..... Question 1 is, do I just the replace the valve itself or do I also replace the vacuum solenoid? Question 2 is, how hard are these jobs? Thanks...

Check the fuel injector OhMs tonight. Is this procedure in the FSM? 1 - 12 2 - NO reading at all? 3 - 4 4 - 12 5 - 12 6 - 12 7 - 4 8 - 12 So, does this mean I have 3 bad injectors? Also....I started it, and it sounded healthy. It got progressively worse as it heated up. I pulled the...

Yes, I have a K&N filter on it. Although it has been on there for about 10+ years.....and embarrassingly I have never taken it out to clean and re-oil it. I will take a look at the injectors. I assume the procedure for testing the OhMs is in the FSM somewhere. Hopefully, I can find it.....I...

I took a read of the codes tonight......the only code coming up is a Code 15....which has to do the CTS. Not sure if that has anything to do with the problems....

Yes, it held pressure as outlined in the FSM. Hmmm..inspect injector harness, what would I look for? I will take a look around the ECM. Here are the codes it gave at that time. The service engine light did not come on the other day after installing new opti...etc. 43 knock sensor circuit...

Hi, I am new to this forum, and am excited to see a ton of great info. I'm from Killingly, Connecticut and have a 92 vert and also a 67 Chevelle (10 sec drag car). Glad to be aboard! I did a search regarding my problem, but could not find any concrete info to help! I apologize in advance as...