High HC levels... (update)
#16
ok so update! i stopped by my friends shop and used his smoke machine to check for an intake leak. i found one on the spider/throttle body coupler right behind the idle screw. so i fixed that when i got home (brake clean does not make the engine rev) then i checked the timing. at idle it was 10 advanced and at 3000rpm it was WAY above 23 degrees. so i changed it to 23 at 3000rpm, and now idle seems to be around maybe 2 retard to 0. does that sound right? Plugs are WR7DC's. i also did the vac test on the advance diaphragm, no leak down.
Last edited by Ducman82; 08-03-2010 at 08:54 PM.
#18
im going to go get it checked tomorrow i think. after i give it a once over again before hand. one thing i did not think of, is i have that crankcase evac set up to my oil breather/filler cap. so i will disconnect that just in case.
#19
ok so update! i stopped by my friends shop and used his smoke machine to check for an intake leak. i found one on the spider/throttle body coupler right behind the idle screw. so i fixed that when i got home (brake clean does not make the engine rev) then i checked the timing. at idle it was 10 advanced and at 3000rpm it was WAY above 23 degrees. so i changed it to 23 at 3000rpm, and now idle seems to be around maybe 2 retard to 0. does that sound right? Plugs are WR7DC's. i also did the vac test on the advance diaphragm, no leak down.
In Calif two degrees off the factory idle timing and you fail, but I don't think its checked at all in above an idle.
#20
well im not sure what to set the timing at. to me it looked way advanced, but it might run better up there. i will find out tomorrow when i drive to class and see how it does. i might stick it back where it was (bolt was about half way between ends of throw on the dist)
#21
UPDATE. so i found out im a moron and did not disconnect the vac lines to the distributor, SOOOO the timing was right. after another can of brake clean i did find a little intake boot leak. fixed that. then it was still lean, so i turned up the rail pressure and BAM! passed my next emissions test with flying colors! YAY! all this time i had a small intake leak and not enough fuel pressure. thats why my last dyno pull had such bad numbers...
#26
well i had it set at 35 PSI. from what research i did that was factory, so i had no reason to think otherwise. so upped up the pressure (my buddy has a sniffer machine) we could see the HC drop, so i kept going till it leveled out some. i still need to do more checking to see if that is a good setting.
#29
Lean missfire drives up the HC, every time. Doesn't matter if it is fuel pressure or a vacuum leak...it is still not enough fuel.
Glad you got it to work better.
Now add timing 2-3 degrees at a time, until you can make it "rattle" on a hot day. Take out the amount you added to finally make it "rattle" and you will improve the performance significantly. Just adding 5-7 degrees makes a huge difference.
Glad you got it to work better.
Now add timing 2-3 degrees at a time, until you can make it "rattle" on a hot day. Take out the amount you added to finally make it "rattle" and you will improve the performance significantly. Just adding 5-7 degrees makes a huge difference.