Replaced both Cylinder Head Gaskets …
Included Exhaust Manifolds Gaskets, Upper & Lower Intake Manifold Gaskets.
Tested Cooling System Constant Control Relay Module (CCRM).
Tested Engine Coolant Sensor.
Replaced Valve Stem Seals. Umbrella type.
Rebuilt Fuel Injectors.
Cleaned, lapped, and reseated Valves.
Replaced Spark Plugs.
Replaced Spark Plug Wires.
Cleaned small amount of oxides from distributor cap (inside) aluminum lugs.
Distributor / distributor timing has not been disturbed. Distributor housing still set at OEM chisel marks.
Replaced EGR Valve Control Solenoid. Was activating check engine light and chime. CEL now off.
Cleaned internals on IAC - Idle Air Control Valve; no difference. Then also replaced IAC; no difference
With IAC connected engine idle is a little rough. Without IAC it is the same; rough, but have to adjust idle stop to keep engine running. Installed temporary slip blind at IAC but found no difference.
Cleaned internals and tested diaphragm at EGR Valve. Remounted valve w/new gasket. Installed temporary slip blind between EGR and manifold; found no difference in idle quality. Pulled slip blind.
Tested TPS – Throttle Position Sensor.
Cleaned and tested MAF – Mass Airflow Sensor 3-times. Even disconnected with engine running and there is only a very slight difference in idle quality... Maybe gets a tiny bit worse.
(1) power circuit good. (12.34 V)
(2) ground circuit good. (12.69 V)
(3) 2nd ground circuit good. (12.69 V)
(4) * MAF electrical “signal” swings a few hundredths of a volt along with engine roughness swing at idle
= approx 0.78 to 0.810 V. Voltage numbers rise and fall fairly smoothly during rev up to 1500 rpm and coast down.
When engine rpm is increased (by hand) it will not hold at a steady rpm.
Idle rpm 510 to 520. Spec calls for 550.
Have not tested O2 sensor.
Soaked every imaginable vacuum hose, fitting, component, with carb cleaner; no change in idle.
Engine vacuum at upper intake manifold 18 to 18.75 in. At idle. Needle bounces within the range.
Now have trouble codes 56, 35, 63.
Tired of throwing money at this car / money pit.
Car only has 45,000 total miles.
have the same problem?
Monday, April 2nd, 2012 AT 2:28 PM