So itÆs that time again. I love California. Any way my 89 4runner 3vz V6.


The Motor has like 10000miles on it (rebuilt)It passed no problems two years ago.






The mods to the truck are Downy headers, electric fan, also had the injectors cleaned and rebuilt when I put the motor in.

Any way here is the results of the first test with a brand new Cat!



OK so I went home did a tune up changed plugs, wires, cap, rotor, oil, filter. And New O2 Also set the idle up a bit to.

So the next day I tried againà


What the hell? Got worse!!
So with tail between legs went home. Found the ASV diaphragm was gone! Had two exhaust leaks one the small 5/8ö pipe from the ASV to the Header, the other on the 5/8ö pipe from the EGR to the header. Replaced the ASV and tested it, now working. Fixed the exhaust leaks too. Turned the idle down a bit too. The timing is at 10 like the under hood sticker says to set it.

So letÆs try again


Dam Failed Worse then ever!! GROSS POLLUTER! NO!

OK now what? So I take the truck home really at a loss now? So I start checking things. The timing checks out, the TSP is working correctly; the ECU is not throwing any codes.
Oh all the tests were with regular gas. Any ideas I donÆt know what to do at this point.

From what I have read on this site, I will run a high octane fuel, and advance the timing a bit (maybe like 8or7), could my electric fan kicking on and off during the idle test cause some problem (the idle drops like 25-50rpm)?
could the fan be making the engine too cold and making it run different.