98EdBomber
Well-Known Member
- Joined
- January 5, 2011
- Messages
- 204
- Reaction score
- 5
- City, State
- Las Vegas, NV
- Year, Model & Trim Level
- 98 E.Bauer 4.0(RWD)
1998 Ford Explorer 2WD 4.0 SOHC Auto w/ 151,00 miles. I have owned the vehicle since it had 23K and have done periodic tune ups according to service manual. Oil change, filter, air filter, brakes, etc, etc...
Symptom : Engine vibrates when warming up.
Occurs on cold or warm start up. On a cold start up the idle will start out at a stable 900rpm and vibrate more than normal.
After warm up temp is reached it settles down to 650-700rpm and smoothes out but still NOT where it should be.
Replaced parts:
battery
alternator
Motorcraft spark plugs - gap .054
Bosch spark plug wires - Tested and no arcing
Coil pack - Tested Primary and Secondary Resistance - Within Spec -
O2 sensors (All 4)
IAC Valve
thermostat and housing (TSB Fix) - Coolant system Flush -
PCV valve
Intake gasket Fix - FORD TSB - Uppers and lowers,galley plug, tensioner, oil restrictor
New oil and filter(motorcraft) - 5w30 Valvoline Full synth oil
Fram Air Filter
Fuel Filter - Changed about 15K miles ago
Changed Tranny fluid and filter
ECT Sensor
IAT sensor - Tested - within spec
TPS sensor - Tested - within spec
Cleaned throttle body - Very minor build up - Lubed linkage -
MAF - Cleaned and tested voltage - Within Spec -
Fuel Injectors - all clicking
Fuel pressure - Within spec
Fuel Injectors Cleaner - Every 3-5K miles from day one
Exhaust system - No leaks
Catalytic Converter - Removed for tranny fluid change - Inspected and appears to be fine (No rattling)
Vacuum system - Tested with Propane and Carb Cleaner - No apparent leaks
UPDATE July 28, 2011
Shaky idle and vibration throughout cabin have increased over the last 5 months. Still gets the same gas mileage and no problems running or starting.
UPDATE: Jan 27, 2011
Last item replaced were O2 sensors. This made the most improvement. There is still a slight stumble at stop lights.
UPDATE: Feb. 4, 2011
Replaced IAC Valve and the idle seems to have been improved but the vibrations dont seem to be completely eliminated.
UPDATE Feb 16, 2011
Idling issue has been improved yet the engine has its moments that it will vibrate. Especially now when warming up.
Symptom : Engine vibrates when warming up.
Occurs on cold or warm start up. On a cold start up the idle will start out at a stable 900rpm and vibrate more than normal.
After warm up temp is reached it settles down to 650-700rpm and smoothes out but still NOT where it should be.
Replaced parts:
battery
alternator
Motorcraft spark plugs - gap .054
Bosch spark plug wires - Tested and no arcing
Coil pack - Tested Primary and Secondary Resistance - Within Spec -
O2 sensors (All 4)
IAC Valve
thermostat and housing (TSB Fix) - Coolant system Flush -
PCV valve
Intake gasket Fix - FORD TSB - Uppers and lowers,galley plug, tensioner, oil restrictor
New oil and filter(motorcraft) - 5w30 Valvoline Full synth oil
Fram Air Filter
Fuel Filter - Changed about 15K miles ago
Changed Tranny fluid and filter
ECT Sensor
IAT sensor - Tested - within spec
TPS sensor - Tested - within spec
Cleaned throttle body - Very minor build up - Lubed linkage -
MAF - Cleaned and tested voltage - Within Spec -
Fuel Injectors - all clicking
Fuel pressure - Within spec
Fuel Injectors Cleaner - Every 3-5K miles from day one
Exhaust system - No leaks
Catalytic Converter - Removed for tranny fluid change - Inspected and appears to be fine (No rattling)
Vacuum system - Tested with Propane and Carb Cleaner - No apparent leaks
UPDATE July 28, 2011
Shaky idle and vibration throughout cabin have increased over the last 5 months. Still gets the same gas mileage and no problems running or starting.
UPDATE: Jan 27, 2011
Last item replaced were O2 sensors. This made the most improvement. There is still a slight stumble at stop lights.
UPDATE: Feb. 4, 2011
Replaced IAC Valve and the idle seems to have been improved but the vibrations dont seem to be completely eliminated.
UPDATE Feb 16, 2011
Idling issue has been improved yet the engine has its moments that it will vibrate. Especially now when warming up.