Grn92LX said:I found the vacuum leak today. Its at the lower intake. I'm gonna retorque it and see if that fixes it. If not, i'm thinking that its because of the ehads being milled and block being zero deck that the intake doesn't line up 100% and may need to be milled. The car is throwing lean codes and I have a check engine light at idle. The car idles high too about 1200rpm. Hopefully once I fix the vacuum leak, the idle will drop and the check engine light will go away. Then I can start tuning.
I changed the oil today and I took it for a drive. It will start up and idle fine with no surging or stalling.
I was giving it some 4-5k rpm pulls in 2nd and 3rd gear and letting it come down in gear.
Tomorrow i'm gonna retorque the lower intake and go over all the bolts on the engine and trans to check for tightness
Grn92LX said:Alright, little update.
I retorqued the lower intake. While i had the upper off I realized I forgot to plug 1 vacuum port so that was another vacuum leak I had. I fixed that and I also deleted that 1 vacuum line on the upper that runs from one port on the upper to another port on the upper.
Driveability is improved from fixing the vacuum leaks.
I did a 2nd gear WOT pull to around 5000-5500 and looked @ my wideband. Its running too rich up top. The a/f goes from a mid 12 to into the 11's. I gotta tune that.
It runs a little hotter than my 302 did. I dunno if its due to the more power and compression or maybe my radiator got rotted out while it sat for months. It was hot and humid tonight though. It doesn't over heat or even come close to over heating. Runs around 190*. I could probably run extra water instead of antifreeze. I don't think it needs to be burped but i'll try.
Mike
stprorolla49 said:mike what combo are you using in the 347.....im very curious to know because my friend just bought a 90 lx hatch with a 347 in it....it has afr 185's, lunati cam (dont ahve teh specs off hand but its pretty tame, and a performer II intake, and its only making like 352rwhp on a larocca tune on 94 octane, and it STILL SLIGHTLY pings in hot weather........any advice?
what size injectors are you running?? he only has 24's which are going to be replaced within the next few days...Grn92LX said:If he's pinging the only thing I can think of is a dirty maf, dirty injectors, running lean or too much timing. I remember you posting about his combo and it doesn't make near what it should due to the junk camshaft, stock afr springs and poor exhaust (1 5/8" shortys).
My combo is listed in my signature. Little "tricks" I have are 55.6cc heads, lightb weight rotating parts like rods, balancer, flywheel and even my clutch disk is lighter than a ford/valeo diskI do run a 2.5" mid pipe which I feel is holding me back a little. I told ed I was gonna be running a 3" mid pipe but due to money,I used my old 2.5" pipe. I Emailed Ed to see what he says.
I haven't heard any pinging and I run over priced 93 octane. I paid $2.73/gal last week and I noticed it went up since to $2.83
I still have to dial in my timing curve and lean out my WOT a/f.
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