So many CEL codes at once.

[vman5911]

I have a 2000 V6 Solara. Initially, I got a check engine light indicating that my EGR valve was probably faulty and that the position sensor was faulty as well. Soon after, I began to get error codes indicating that the oxygen sensor and air/fuel sensors were probably faulty. Soon after that, I started to get the Closed Loop Fuel circuit coolant temp insufficient code. Add that to random cylinder misfirings and you have a very, very frustrated person with a car that isn't running very well

I'm at a loss here, guys. It's starting to get to the point where I don't even know where I should start. Any advice would be immensely appreciated.

[GreeKAvaLoN]

start from the first code you got, work around the egr, see if u find anything wrong, pull the neg off the battery and reset the ecu and drive a bit. When i took my s/c off i ended up with like 14 codes. Some where like intake and egr and mass air blah blah. ended up i didnt tighten one bolt on my throttle body.. all well now! its probably one thing that spawned into a million little killer baby codes.

[vman5911]

Thanks! That made me feel a lot more relieved.

[TheGreenDutch]

Change your spark plugs and wires and do a Seafoam treatment if you haven't done this in a long time. Check your vacuum hoses for leaks or crud build-up. Is the CEL flashing?

[vman5911]

The CEL flashes on occasion, but it doesn't happen often. The spark plugs are probably a good idea. Haven't changed those in a while. I recently seafoamed the engine, so I shouldn't have to do it again.

[TheGreenDutch]

I had bad plugs and went thru similar things. Change the wires too. They get old and cracked...

[vman5911]

Any recommendations on spark plugs?

[TheGreenDutch]

Denso double platinum is widely recommended close to original equipment.

[vman5911]

The ones in the back are a pain to get to. I have the Chilton manual...any recommendations to get back there, or do I just work through the awkwardness?

[navarachi]

someone said they could do it without getting the header off, i couldnt. I'd just take it in, 100 bucks for a tune up is dirt cheap compared to the time you'll spend messing with those headers.

i just had the egr valve replaced as well.

good luck

[SleeperSolara]

The rear spark plugs are somewhat weird, but you can work your way around stuff if you have a small arm.