I put the scanner on my car the other day to check out how the new engine runs...Well, it runs nasty rich at idle. I haven't done any other testing or tuning yet, one thing at a time...Anyway, are a few of my readings at idle, warmed up...

INT 98
BLM 108
IAC 23
TPS .78
O2 Xcounts 5-4
Base PW 2.0
MAP 60
O2 mv 824

The thing that I find the most curious is the MAP reading. It seems that it shows me to have very little vacuum at idle. The cam I am running is mildly aggressive in my opinion and I expected more vacuum. I will hook up a vacuum guage and see what it shows tomorrow. What do you guys and gals think of this? I know I am very rich, you should see the plugs! What do some of you with more aggressive cams or similar cams see for MAP values at idle? Thanks in advance...

224/236 @.050"
.525/.555
113 LSA
Comp blower cam, no I don't have the blower yet!!

 

60 Kpa is about 12" of vacuum. What I would consider normal for a cam of that size. And yes, I can believe you are very rich at idle.

RBob.

 

Okay, thank you...I posted the same thing on the TPI board and got only one response. He said the same thing as you. Not that I didn't believe him, I just like to get lots of opinions. Any suggestions as to what I can do to make it run leaner at idle?

I was thinking about moving the VE values from a lower KPA to the 60 KPA at the idle RPM range and see what happens. Is that a good idea?

 

Bob's right.
Your on the right path.

 

Thank you guys, I appreciate your responses...

 

your tps at idle is off, .78v is a part throttle voltage. you want to be around .55-.58. for the ecm to read an idle voltage.

 

I noticed that, thanks for the reminder. I will take care of that...