This has been an ongoing problem and I refuse to get @$$ raped by the dealer, but I'm sure someone else had this problem:
I'm getting almost no power from the V8...it runs like a 4-cyl 2 liter car...my moms 7-year old malibu has better acceleration.
New catalytic converters (problem existed before this...so unrealted)
Car runs smooth, accelerates smooth, runs great but no power, poor accel.
Starting is hard...I have to crank/prime the fuel pump 3-7 times.
New MAF sensor
New fuel filter
Relatively new plugs,wires, and distrib cap (about 8k miles on them)...I'm 99% certain that timing is good (there is a VERY slight ping at high rpm) If you're getting pre-det (or pinging) at high RPM, then your timing IS NOT good. You need to check your timing.
No codes...not a single one.
I can't do the base timing check with the spout? (computer-timing tweaker thing) disconnected when runnning codes...car just doesn't start. I don't understand, you're disconnecting the spout to check your codes...? Either way, you NEED to check your timing. Retarted timing will cause poor acceleration. So you need to make sure your timing is at least set on 10* BTDC, but I would advance it to about 12*.
The only thing that makes a substantial and very noticeable performance improvement is disconnecting the IAT (intrake air temperature sensor)...then it drives much much better. I don't think it's the fuel pump b/c disconencted IAT seems to fix the problem..but it's a hack workaround. I doubt your IAT sensor is what is causing the problem. Although, you might want to get a new sensor.
The car has 165k on it.
What can this possibly be guys? What are some serviceable parts that I should replace myself?
Thanks you all!