Oil in Vacuum line June 21, 2007, 08:33:58 AM I was under my hood poking around and noticed something odd. I still have a vacuum line in place to run to the MAP/BAP sensor (it's capped off). That is not the odd part. Upon inspection I noticed the cap was a little loose. I give it the slightest tug and it pops off revealing more oil in the line than I cared to find. When I was running my old combo with Speed density I never noticed ANY oil in that particular line even when I did the H/C/I swap. The line was dry and the PCV screen at the time was about 75% clogged (it was, of course changed with the new intake)I can't really think of any reason for this oil to be where it is. The only new thing I added to my setup within the past 6 months is a 1" phenolic spacer between the uppere and lower intake manifolds. Upon doing this I did take note that the walls of my intake runners were somewhat wet. This is another thing I never noticed with my other setup. The runner walls had some soot, but I can't recall them being wet.About the only thing I can think of is that I may be running too much pressure for the injectors to trim rates properly. I am currently running 19 pounders at 62 PSI (checked with vacuum disconnected). This makes them act like slightly more than a 24 pound injector at factory set pressure. I have more than enough fuel pump to run these pressures, but I believe that the ECU is having a hard time trying to trim the fuel rates at idle and I'm running rich down low.To make matters worse, I have no codes (save for a fuel pump code because I did not run the second wire when I swapped to Mass Air)and my idle is almost as smooth as a stock cammed HO (900 in park, 750 in drive)Also of note. The car always runs strong as a bull at W.O.T. when at 2,000 rpm's and above. Below 2000 rpm she pulls, but feels ike something is missing......It seems to almost always get found during or just after rain. Something about the humidity or whatever gives the car that little bit she lacks down low on a dry day. It baffles me. The throttle response is better and she just pulls away like she should.I have 24 pound injectors here and a calibration tube for them to install into my MAF meter and I'll be installing everything this weekend. I really do need the extra injector for my setup to begin with and doing this I can lower the fuel line pressure to 40-45 PSI thus putting less strain on my pump, lines and injectors which will also help the ECU have an easier time tpuppies the fuel rates as necessary at low speed and idle conditions.Now that you've read my novella:D Any thoughts? Will the injectors help my low end?And why the hell is there oil in that line? Quote Selected
Oil in Vacuum line Reply #1 – June 21, 2007, 11:54:16 AM I dunno but Layla's 2.3 is going through the same issue even with a catch can. I have 56#s to put in as right now I'm running way high on the 35#s.Maybe there is something to this big injector/lower pressure deal.. Quote Selected
Oil in Vacuum line Reply #2 – June 21, 2007, 01:12:52 PM My old 5.0 did that when the pcv screen would gunk up. New one doesn't but it only has 700 miles on it:hick: Quote Selected
Oil in Vacuum line Reply #3 – June 22, 2007, 07:26:01 AM Well, it aint gunked up. Like I said It's been replaced and kept clean. I sould note that there is really no baffle in the Trick Flow valve covers. I guess it is time to throw an oil separator in the line from the valve cover to the EGR spcer as well.QuoteI dunno but Layla's 2.3 is going through the same issue even with a catch can. I have 56#s to put in as right now I'm running way high on the 35#s.Maybe there is something to this big injector/lower pressure deal..I actually tried running the 24's once before albeit with a MAF sensor from a different company then what I'll be using this time... It wouldn't idle worth a due to the MAF sensor (I won't buy anything from that particular company ever again! GARBAGE!!). I simply took it and the 24's out and put the 19's in with the C&L. Part throttle driveability has been spot on this way. That's why I've been so leery to throw the 24's back on. Hopefully I get a chance today. If not then it'll be done tomorrow. Quote Selected
Oil in Vacuum line Reply #4 – June 29, 2007, 05:38:25 PM Well, I put the 24's in and set the pressure to 48 PSI. After some extensive reading on various EEC tuning sites I actually started with 46 and then went to 48. She seems real comfortable there. Base timing was also moved from 12* to 15*. She idles like a stocker and after a week I can honestly say my tripminder and gas guage are both showing that I'm actually getting BETTER gas mileage. Combined city/highway over this past week has been 22.7 MPG. This is up from an average of roughly 18. I realize it could have been a good week, but more than a 4 MPG increase is a lot. I'll keep an eye on it and hopefully the trend continues.....It should.... no more gas smell while idling:D Also, the Assmeter tells me there is more power down low as well. I guess the car really was having trouble ajusting rates down low. She still pulls harder in high humidity and rain conditions below 2000 RPM, but it seems the gap has been closed. Still no lean or rich codes. The oil separator is next. Quote Selected
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