My 93 SSEI w/ 76k miles on it is causing me some serious headache.The problem has been around for a bit and I've been trying to figure it out by replacing possible culprits. NOW the problem has either gotten worse is gaining friends.
Symptoms: Stumbles and all out lack of power under boost. Until recently was only giving check engine light code #56. A few days ago I lost a alt/ps belt and had to replace alt/battery. Now I've got a persistent code #43. Trying to figure out if the 2 are related or problems coincidence?
Items Replaced/Checked Out:
1) Replaced MAF
2) Replaced MAP
3) Replaced Boost Control Solenoid
4) Snout Rebuild
5) Replaced fuel filter and fuel pressure regulator
6) Vacuum Hose Job
7) New Coils
New plugs and wires
9) replaced upper and lower intake manifold gaskets (had a slight leak near #6 that leaked outward)
10) Cleaned IAT
So recap: code 56 and code 43 = headache