idle
1995 f250
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1995 f250
i have a problem with my truck when i start it in the morn ill let it run for 15 ,20 min but runs like crap rough idle then i will drive it a while then when it decides to just like a switch it will run great everthing clears up but park it for 2 or more hours and it starts it all over again any ideas? thanks for your time
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Misfiring spark plugs or shorted plug wires can have a tendency to suddenly correct themselves, though this is usually not consistently temperature related.
One possibility is that the engine is running too lean when cold. Perhaps due to low fuel pressure or a vacuum leak (with a MAF equipped truck). When the engine warms up, the computer looks at the oxygen sensor, finds the engine running lean, and adds enough fuel to compensate and that additional fuel makes it run smooth. This is the most likely explanation for smoothing out after warm up "just like a switch".
Another possibility is that the ECT or ACT sensors are indicating "warmed up", even though the truck is cold. The computer does not add fuel for cold engine enrichment, and the engine runs lean/rough until it warms up. In this situation I would expect a slow improvement in idle quality prior to smoothing out "just like a switch".
One possibility is that the engine is running too lean when cold. Perhaps due to low fuel pressure or a vacuum leak (with a MAF equipped truck). When the engine warms up, the computer looks at the oxygen sensor, finds the engine running lean, and adds enough fuel to compensate and that additional fuel makes it run smooth. This is the most likely explanation for smoothing out after warm up "just like a switch".
Another possibility is that the ECT or ACT sensors are indicating "warmed up", even though the truck is cold. The computer does not add fuel for cold engine enrichment, and the engine runs lean/rough until it warms up. In this situation I would expect a slow improvement in idle quality prior to smoothing out "just like a switch".
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Originally Posted by tony b.
have you checked the iac sensor
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Originally Posted by fefarms
Misfiring spark plugs or shorted plug wires can have a tendency to suddenly correct themselves, though this is usually not consistently temperature related.
One possibility is that the engine is running too lean when cold. Perhaps due to low fuel pressure or a vacuum leak (with a MAF equipped truck). When the engine warms up, the computer looks at the oxygen sensor, finds the engine running lean, and adds enough fuel to compensate and that additional fuel makes it run smooth. This is the most likely explanation for smoothing out after warm up "just like a switch".
Another possibility is that the ECT or ACT sensors are indicating "warmed up", even though the truck is cold. The computer does not add fuel for cold engine enrichment, and the engine runs lean/rough until it warms up. In this situation I would expect a slow improvement in idle quality prior to smoothing out "just like a switch".
One possibility is that the engine is running too lean when cold. Perhaps due to low fuel pressure or a vacuum leak (with a MAF equipped truck). When the engine warms up, the computer looks at the oxygen sensor, finds the engine running lean, and adds enough fuel to compensate and that additional fuel makes it run smooth. This is the most likely explanation for smoothing out after warm up "just like a switch".
Another possibility is that the ECT or ACT sensors are indicating "warmed up", even though the truck is cold. The computer does not add fuel for cold engine enrichment, and the engine runs lean/rough until it warms up. In this situation I would expect a slow improvement in idle quality prior to smoothing out "just like a switch".
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If this is a diesel ("glow plugs", "tedturbo", "Cam Sensor") then you should say so. You would probably do better in the diesel engine forum than in this forum with us (mostly) gassers.
Otherwise, the IAC is an actuator, not a sensor. It admits a variable amount of air to the engine, under control of the computer, in order to control idle speed and act as a decell dashpot. It is mounted on the throttle body. The ECT and IAT sensors can be changed fairly easily, but you should run some tests to be sure they are implicated rather than wasting your money firing the parts shotgun.
Otherwise, the IAC is an actuator, not a sensor. It admits a variable amount of air to the engine, under control of the computer, in order to control idle speed and act as a decell dashpot. It is mounted on the throttle body. The ECT and IAT sensors can be changed fairly easily, but you should run some tests to be sure they are implicated rather than wasting your money firing the parts shotgun.
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Originally Posted by tedturbo
thanks for your reply im not sure what the iac sensor is but it has had a new cam sensor 8 new injectors glow plugs check out ok
https://www.ford-trucks.com/forums/f...play.php?f=117
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