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| Choke turns off before engine is warmed up | |
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| Tweet Topic Started: Feb 12 2012, 04:28 PM (713 Views) | |
| spyguyfred | Feb 12 2012, 04:28 PM Post #1 |
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When i start my 1999 metro 3 cylinder with 5 speed stick it starts up fine and warms up as long as I do not push the clutch in. If I push in the clutch before the engine warms up the choke shuts off and the engine runs ruff at idle. If I drive it before the engine is warmed up it will shut off as soon as I push the clutch in when I come to a stop sign until the engine get to running temp. anyone have any idea what could be wrong? |
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| Deleted User | Feb 12 2012, 09:10 PM Post #2 |
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There is no choke. The PCM has sensors and inputs that simulate choke function. Why pushing in the clutch affects this is unknown. Upon initial start, the PCM sees an electrical signal from the starter solenoid wire that provides fuel enrichment (choke) for a pre-determined period. I believe this is 12 seconds. Fuel enrichment is provided by sensors to the engine coolant system and air intake system. The colder the air and engine coolant, the more fuel the PCM provides to the fuel injector. There are temperature v. resistance values for sensors in the Factory Service Manual. I have clipped the air inlet sensor and coolant temperature sensor to an ohm meter while boiling them in a pan of water on the stove. Use the meat thermometer to check the temperature. Don't let the wife and/or girl friend catch you using the kitchen equipment to cook car parts. |
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| iBLKBRY | Feb 13 2012, 03:51 AM Post #3 |
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Sounds like the Idle Speed Control is not being actuated. The PCM senses, MAP, TPS, Coolant temp, Air Conditioning selected on, High Current demand (Blower, headlights) and the ISC throttle at idle switch and commands the ISC to the appropriate idle. Preliminary check... With the engine at idle, your low and ruff idle, check to see if the throttle cam is against the throttle body hard stop. If so, the ISC is fully retracted. If this is the condition, the PCM is sensing that either the throttle cam is not at idle through the hall effect switch in the ISC, or the TPS is indicating and above idle position. Again, this is ONLY if the ISC actuator is FULLY retracted and the throttle cam is against the TB hard stop. By the way DO NOT adjust the hard stop to compensated for your problem. Go to an auto store that provides free scanner use. Check your TBI position at idle and verify it is at 10% to 12%. To go on further, I'd have to have more info. PM me if you are still having problems, and we can set up a time when I you can call. Do you have the factory manual? If you can purchase one on ebay, the troubleshooting procedure will help you eliminate many possibilities. |
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| spyguyfred | Feb 20 2012, 08:05 PM Post #4 |
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thanks guys for the help. i was looking for a hose that was not attached but did not see one. today I started working on the car again and noticed that a hose was missing. I have no idea how it came off at both ends. i will know if it is fixed in the morning when i try to go to work. |
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| iBLKBRY | Feb 21 2012, 05:16 AM Post #5 |
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Do you have a picture? Remember, there is a hard line on the firewall that is open at both ends. |
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3:34 AM Jul 11