hey guys, on my 91 ka24de.. when i coast on neutral to a stoplight and actually stop, my idle just gets bumped up to 1500 give or take 100-150.
anyone know what could be causing this?..
also.. i went out to get some icecream from publix and the car would not start for **** in the parking lot..
i thought it was the starter.. but i think problem may lie in the fuel... i think i saw a puddle of fuel underneath my car(could've been water from other car's AC...) and the car started when i pulled the pump and ran for quite awhile.. (30secs) before shutting off..
not to mention my gastank leaks when its filled over the auto stop point..
lmk, thanks guys!
after coasting to a stop.. idle bumps up to 1500?
-
vancouverbc
- Posts: 3197
- Joined: Thu Oct 30, 2003 1:30 am
- Car: 1991 240sx
Re: after coasting to a stop.. idle bumps up to 1500? (babowc)
If you have a/c on, the idle will be high.(Fast idle control device). Also , if you just started driving, the idle will also be high.(air regulator).
Not sure about your start problem. Maybe the fuel pump. Be careful with the gas leaking(obviously). Do you hear the fuel pump come on for 5 seconds when you first turn key?
Not sure about your start problem. Maybe the fuel pump. Be careful with the gas leaking(obviously). Do you hear the fuel pump come on for 5 seconds when you first turn key?
-
vancouverbc
- Posts: 3197
- Joined: Thu Oct 30, 2003 1:30 am
- Car: 1991 240sx
Re: (babowc)
Ok, so you dont have air conditioning. Is your idle ever normal? Maybe your air regulator is stuck open.
-
vancouverbc
- Posts: 3197
- Joined: Thu Oct 30, 2003 1:30 am
- Car: 1991 240sx
Re: (babowc)
It would never go below 1500(?) if it was a stuck air regulator.
disconnecting to O2 sensor to see if that improves things is one easy thing to check. I guess you could squeeze the hose going to the air regulator and/or the hose going iacv to see if that changes anything.
This is a pic of the air regulator. The intake manifold is removed to reveal the air regulator. Notice how the brass pipe branches off to the air regulator. Pinch the rubber hose at this junction to see if it makes a difference. It should make a difference when car is starting in cold condition as the air reg. supplies air during cold start. Use a cloth to protect rubber hose when pinching with long pliers. You can also pinch off the rubber hose right at the iacv to test IACV.
TROUBLE SHOOTING (1991 240sx)******************HIGH IDLE: 5,8,13,21
UNSTABLE IDLE:
after warm-up:-10,25,2,4,7,1,13,8,3,12,17,18hunting:-13,25,7,8,10
ENGINE STALL:
Cold-9,25,2,4,7,1,17,19,18Hot-15,25,,2,4,1,17,19,18,20On momentary acceleration-9,25,2,4,1,17,19,18after deceleration-9,3,25,2,4,1,13,17,19,18acceleration or cruising-25,2,4,1,8,17,19,18heavy electrical load-6,25,2,4,1,17,19,18While turning-25,2,4,1,17,19,18
Symptom 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
disconnecting to O2 sensor to see if that improves things is one easy thing to check. I guess you could squeeze the hose going to the air regulator and/or the hose going iacv to see if that changes anything.
This is a pic of the air regulator. The intake manifold is removed to reveal the air regulator. Notice how the brass pipe branches off to the air regulator. Pinch the rubber hose at this junction to see if it makes a difference. It should make a difference when car is starting in cold condition as the air reg. supplies air during cold start. Use a cloth to protect rubber hose when pinching with long pliers. You can also pinch off the rubber hose right at the iacv to test IACV.
TROUBLE SHOOTING (1991 240sx)******************HIGH IDLE: 5,8,13,21
UNSTABLE IDLE:
after warm-up:-10,25,2,4,7,1,13,8,3,12,17,18hunting:-13,25,7,8,10
ENGINE STALL:
Cold-9,25,2,4,7,1,17,19,18Hot-15,25,,2,4,1,17,19,18,20On momentary acceleration-9,25,2,4,1,17,19,18after deceleration-9,3,25,2,4,1,13,17,19,18acceleration or cruising-25,2,4,1,8,17,19,18heavy electrical load-6,25,2,4,1,17,19,18While turning-25,2,4,1,17,19,18
Symptom 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
-
vancouverbc
- Posts: 3197
- Joined: Thu Oct 30, 2003 1:30 am
- Car: 1991 240sx
Re: (vancouverbc)
Make sure you have cleaned IACV and disconnected the air injection valve.
i went outside today and after the car warmed up a bit, i took the TPS plug out and the first time idle stayed at 750.i shut off the car and re-did it and the idle was jumping from 1000 to 1200 back and forth.
vancouverbc, thank you so much for the post ^ ^, i'll put that to REAL good use thanks again!
vancouverbc, thank you so much for the post ^ ^, i'll put that to REAL good use thanks again!