Otay, I took ol' Bessy (my 97 Bonneville SE) up to AutoZone yesterday so they could run the codes on why my SES light is on. They said that the code was P0401, basically meaning a bad Exhaust Gas Regulator (EGR). I priced the part out at $143...Now at this point if the only thing its going to do is turn my SES light off then I don't see any reason in replacing it because latelly this car has been giving me pure hell and I want to get it fixed RIGHT ya know.
It has been taking a LONG time to start, and I've checked fuel pressure, the regulator is ok, replaced the fuel filter ect. I did notice that after it is hot that sometimes when I start it from being parked for less then 30 minutes it runs like **** under 35mph, but if I mash the accelerater and get her sputtering up to speed she runs fine after that, but once I turn it back off its HELL to start it again, and it has backfired through my intake manifold twice now, causing the vacuum lines to come off of the throttle body. That being said makes me angry, cause the plenum is brand new and I REALLY can not afford to fix it again if it fails due to precombustion backfires. I just don't know what else to do anymore with it. It runs great on the highway though, I am just frustrated with it.
Could the EGR be causing these problems?
97 Bonneville SE 251K
Replaced so far:
Coil packs (all three) @ 187,000
Water Pump @ 187,000
Radiator Hoses @ 242,000
Coolant Flushed @ 242,000
Thermostat @ 242,000
Upper Plenum & Lower Intake Manifold gaskets @ 242,000
Fuel Filter (twice) 242,000/251,000
Air Filter 242,000
Pressure sensor on plenum 242,000
Coolant Temp Sensor 242,000
Oil Pan Gasket 242,000
Spark plugs & wires @ 242,000
Plastic Elbow from lower intake to tensioner @ 242,000