OK I'll try to be as brief as possible.. I am running the Anderson Motorsports PMS w/ the Uego 2000 air flow meter. The motor spec's 347 trickflow box R intake Abaco mass air 75mm TB 30lb injectors RHS 200/64 cast heads Comp Cams @.050 lift Intake 224 Exhaust 236 lobe seperation 114.0 I am running it on pump gas.. Now for the questions... I am getting the typical surging in the motor at idle and going down the road after I let off of the throttle. What is causing this? I can not get it to level out under min load. the car starts "bucking" this happens more frequently at lower RPM's, if I run it at 3800RPM and up it still shows up once and while but not as frequently.. the timing is showing up on the computer as jumping from 4 degrees to 35 degrees and will not settle down. this happens at idle and at part throttle. What do I need to look at or change to help with this problem? I could keep going on but this is a starting point, I hope someone else can help me try to figure out what is going on.
Verify that your AFR is correct (or at least in the ballpark) then try pulling some spark out of the area where you are having the bucking. For the surging I would verify that your throttlebody is set to factory spec (~2 turns up on the ISC and 0.010" gap on the TB stop then a full turn in to preload the TB plate open) Wes
The AFR meter that is in the car measured the same as the dyno shops AFR.. so I think that it is accurate. I am in the process of changing out the ignition system with a Mallory system. I also put a new set of plugs in it. hopefully I get this done today and get it started to see if that makes any difference.. when you say "pull some spark out of it" I am not sure what you mean.. do you mean to retard the timing out those RPM points? I have tried that and also played with the fuel but it still would keep bucking...
You are correct on the spark. Grab a copy of InterACQ and get a datalog of your bucking and verify that the spark you pull is indeed coming out. Also verify that the MAF reading is steady and not fluctuating and that the AFR is close to what is commanded. Wes
