|
Six Cylinder 4.2 Liter Jeep engine Specs - Technical specs
| Displacement | 256 cubic
inches
|
Click below to see
the Vacuum curve
| Cylinder numbers (front
to rear)
| 1-2-3-4-5-6 | | Firing order | 1-5-3-6-2-4 | | Spark Plug gap | 0.033 to
0.038
| | Ignition timing | 9 to 11
degrees
| | Idle speed (auto) | 600 +/-
70 rpm
|
(manual)
| 680 +/-
70 rpm
| | Engine oil | API SE of
SF
| | - Oil capacity | 6qts | Automatic
Transmission Fluid
| Mercon
ATF
| | - ATF Capacity | 4qts |
| Engine | Transmission | Initial
Timing at
Curb Idle (Vacuum
Hose
Disconnected)
|
Curb
Idle Speed RPM
| Set
To
| Acceptable
Range
| Set
To
| Acceptable
Range
| 258
1 Barrel carb
| Manual | 3°
(49)
| 1°
5°
| 850
(49)
| 750
950
| 10°
(Alt)
| 8°
12°
| 600
(Alt)
| 500
700
| 8°
(Cal)
| 6°
10°
| 850
(Cal)
| 750
950
| | Automatic | 8°
(49)
| 6°
10°
| 550
(49)
| 450
650
| 10°
(Alt)
| 8°
12°
| 550
(Alt)
| 450
650
| 8°
(Cal)
| 6°
10°
| 550
(Cal)
| 450
650
| 258
2 Barrel carb
| Manual | 6° | 4°
8°
| 650 | 550
750
| | Automatic | 6° | 4°
8°
| 550 | 450
650
|
|
Linear Mode
