Poor Acceleration
F2-57flowchartF2 section = 1.8L K8-ZE V6 engine.
Troubleshooting Guide
Poor Acceleration (STEP 5–8)
1
STEP 6: Are ECM terminal voltages OK? 1C-Starter signal; 2E-Engine coolant temperature sensor; 3D-Sensor ground (page F2-141)
No
Check for cause (page F2-141)
Yes
2
STEP 7: Is intake manifold vacuum correct at idle? Intake manifold vacuum: More than 450 mmHg (17.7 inHg)
No
Check for air leakage of intake-air system components
Yes
3
STEP 8: Is fuel line pressure correct at idle? (page F2-113) Fuel line pressure: 260–310 kPa (2.6–3.2 kgf/cm2, 37–45 psi) (vacuum hose to pressure regulator disconnected)
No
Low pressure: Check fuel line pressure while pinching fuel return hose. If pressure quickly increases, check pressure regulator (page F2-113). If pressure gradually increases, check for clogging between fuel pump and pressure regulator. If hose is not clogged, check fuel pump maximum pressure (page F2-110). High pressure: Is fuel line clogged? If it is not, replace pressure regulator (page F2-115). If it is, replace fuel line
Low pressure: Check fuel line pressure while pinching fuel return hose. If pressure quickly increases, check pressure regulator (page F2-113). If pressure gradually increases, check for clogging between fuel pump and pressure regulator. If hose is not clogged, check fuel pump maximum pressure (page F2-110). High pressure: Is fuel line clogged? If it is not, replace pressure regulator (page F2-115). If it is, replace fuel line
Yes
4
Does fuel line pressure decrease during quick acceleration? If it does, check fuel pump maximum pressure (page F2-110). If pressure is OK, check fuel line and filter for clogging. If it does not decrease, go to next step