Engine Compression
Check engine compression with engine at normal operating temperature. Disconnect fuel pump relay from fuse/relay box. See FUEL PUMP RELAY LOCATION
table. Remove all spark plugs, hold throttle lever wide open, and operate engine at cranking speed (300 RPM). Crank engine a minimum of 4 compression strokes.
FUEL PUMP RELAY LOCATION
| Model |
Location |
| Amigo & Pickup |
On Right Fender Panel, Near Battery |
| Impulse |
On Left Fender Panel, Behind Battery |
| Trooper |
On Left Firewall, Near Brake Master Cylinder |
COMPRESSION SPECIFICATIONS
| Application |
Specification |
| Compression Ratio |
| Amigo & Pickup |
| 2.3L & 2.6L |
8.3:1 |
| Impulse 1.6L |
9.8:1 |
| Trooper |
| 2.6L |
8.3:1 |
| 2.8L |
9.8:1 |
| Compression Pressure |
| Amigo & Pickup |
| 2.3L & 2.6L |
142-171 psi (10-12 kg/cm2
) |
| Impulse 1.6L |
185 psi (13 kg/cm2
) |
| Trooper |
| 2.6L |
155-157 psi (10.8-11 kg/cm2
) |
| 2.8L |
100 psi (7.0 kg/cm2
) |