hard starting 1992 240sx
help!!!!!!!! hard starting 240sx
I have a 1992 240sx ka24de it is very hard to start some times,it does not matter if hot or cold,I replaced plugs,wires,cap rotor, oxygen sensor air filter,and fuel filter,I also checked the timing,once it starts it runs great.. someone help!!!!!!!!!!!!!!!!!!
Re: (180fan)
Does it help if you press the gas pedal while trying to start?
Re: (mr_wizard)
sometimes it helps,but sometimes it floods it. i am so stumped, I tried shooting cleaner into the valve body,it seemed to help alittle bit,I drive over 1500 mile a week min of 200 a day,does not matter if hot or cold
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vancouverbc
- Posts: 3197
- Joined: Thu Oct 30, 2003 1:30 am
- Car: 1991 240sx
Re: (ornchman)
there is a trouble shooting guide for this on page 169 of factory service manual.
The following is pared down version.
hard start under
- normal conditions: 6,1,2,4,7,10,17,19,18-cold:6,1,9,2,4,7,17,19,18-hot:1,15,2,4,17,19,18
Symptom procedure definitions:===============1.ensure fuel pressure within spec2.perform appropriate test in injector malfunction diagnostic chart3.inspect throttle body ports and valves for deposits, wear or plugging4.check for spark using spark tester5.Check idle speed control circuit. 6.Ensure battery is fully charged and maintains at least 9.6 volts during cranking.7.check spark plug gap and fouling8. ensure no vacuum leaks in intake system9.Check fast idle system.10.check egr control valve operation11.Check EGR control valve solenoid operaton.12. check engine compression13. disconnect exhaust gas sensor and monitor change in driveability. if it improves, replace sensor. if not, go to 16.14.Remove canister purge line from intake and test drive vehicle.15.Remove vacuum hose from fuel pressure regulator and monitor for symptom change.16.enter self-diagnosis mode 11 and monitor exhaust gas sensor operation17.check ecu harness connector18.try a good known ecu19.Check ECU power source and ground circuit.20.Check timing belt for proper installation(V6 models)21.Check throttle linkage operation.22.Try a known good airflow meter.23.Check for intake valve deposits.24.Check engine temperature sensor25.perform power balance test
The following is pared down version.
hard start under
- normal conditions: 6,1,2,4,7,10,17,19,18-cold:6,1,9,2,4,7,17,19,18-hot:1,15,2,4,17,19,18
Symptom procedure definitions:===============1.ensure fuel pressure within spec2.perform appropriate test in injector malfunction diagnostic chart3.inspect throttle body ports and valves for deposits, wear or plugging4.check for spark using spark tester5.Check idle speed control circuit. 6.Ensure battery is fully charged and maintains at least 9.6 volts during cranking.7.check spark plug gap and fouling8. ensure no vacuum leaks in intake system9.Check fast idle system.10.check egr control valve operation11.Check EGR control valve solenoid operaton.12. check engine compression13. disconnect exhaust gas sensor and monitor change in driveability. if it improves, replace sensor. if not, go to 16.14.Remove canister purge line from intake and test drive vehicle.15.Remove vacuum hose from fuel pressure regulator and monitor for symptom change.16.enter self-diagnosis mode 11 and monitor exhaust gas sensor operation17.check ecu harness connector18.try a good known ecu19.Check ECU power source and ground circuit.20.Check timing belt for proper installation(V6 models)21.Check throttle linkage operation.22.Try a known good airflow meter.23.Check for intake valve deposits.24.Check engine temperature sensor25.perform power balance test
Re: (180fan)
Fuel pressure shouldn't be an issue if once it starts it runs fine. Same with Injectors. .....Actually, I highly doubt alot of those. But you can never be sure without testing first. Honestly though, it sounds alot like something isn't grounded correctly. Make sure all your grounding wires are connected properly and on tight for a good connection.