FordExcursions.com Forums
Randy Kight
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• Richmond, VA, USA |
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• Registered on 4/5/2003 |
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• 18 posts |
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 Posted:12/6/2003 11:04 |
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Hello,
When I start my truck, the choke does not kick on at all, and I have to manually manipulate the rpms to about 1000-1500 until warmed up before hitting the road. After the truck is warmed up, not a problem. As you can probably tell by my description of symptoms, I'm not that up on maintenance, but would like to take a crack at this if anyone out there thinks it posible. Is this a replacement choke issue, or something else similar? Thanks for any information.
Randy
Richmond, VA. |
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LANDYOT
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• Subscriber since 11/23/2003 |
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• Newport News, VA, USA |
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• Registered on 7/15/2003 |
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• 1,110 posts |
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Posted:12/6/2003 15:40 |
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There's no "choke" on fuel injected vehicles. You have a throttle position sensor, and an idle air control valve ... some have a "starter fuel injector ... then the vehicle's computer determines how much fuel to deliver, and how much timing advance for the plugs. Has your "check engine" light come on? If not, then the computer has not received any error messages (out of range readings) from the various sensors.
This reply doesn't help you much, but it may provide a little insight when you take it to a mechanic. If it was mine, I'd pull out my factory service manual and start looking where a problem could've originated.
And by the way, howdy neighbor.
Ken E.
Yorktown, VA |
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monsta
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• The Big Island, HI, USA |
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• Registered on 1/5/2002 |
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• 1,056 posts |
• 2 Vehicles
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Posted:12/6/2003 16:19 |
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Could be the IAC, TPS or MAS.
I'd pull the IAC and clean it first.
I'd actually start with pulling the battery connection for about 15 minutes and let the computer reset.
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Randy Kight
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• Richmond, VA, USA |
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• Registered on 4/5/2003 |
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• 18 posts |
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Posted:12/7/2003 11:22 |
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Thanks for both of your responses. I have not seen a Check Engine light of any sort during the running of the truck, but during the start and run through diagnostics I see this light as well as all the others. I'm currious about cleaning the IAC, TPS or MAS...but not sure what these are. I've purchased a Hayne's manual, but can't seem to find anything...but I'm no mechanic. I've been told that a motor of some sort that sits on top of the engine may be dirty or gone bad. This would cost around 300...but this was one mechanic's theory without looking at it. By the sounds of the repsonses, this "choke" like effect is now handled via chips of some sort. Thanks for the howdy...Yorktown is a wonderful area...right on the water. Apreciate everyone's time.
Randy Kight
Richmond, VA. |
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monsta
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• The Big Island, HI, USA |
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• Registered on 1/5/2002 |
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• 1,056 posts |
• 2 Vehicles
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Posted:12/8/2003 20:45 |
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Here's a picture of the IAC (Idle Air Control).
It is on the back over the throttle body. This view is from the passenger side.
It is held on with 3 (I think) bolts and a non-replaceable gasket. You can probably re-use it if you are just gonna clean it out with carb cleaner but if you replace it get the gasket. It doesn't come with it.
Does the truck idle fine when warm? If so, then the IAC is probably not the problem.
Something is not telling the engine that it is cold and should raise idle. What precipitated this problem? Has it always done it or did it just start? Do you think the cold(er) ambient temps has something to do with it?
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LANDYOT
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• Subscriber since 11/23/2003 |
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• Newport News, VA, USA |
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• Registered on 7/15/2003 |
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• 1,110 posts |
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Posted:12/9/2003 15:49 |
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Good point! If the computer is not receiving a signal telling it what the temperature of the incoming air is, then the MAS is a prime suspect. On the other hand, if the 'puter is being told the coolant temp is "all warmed up," then the coolant temp sensor could be suspect ... but starting with the MAS would be a good bet. |
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Randy Kight
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• Richmond, VA, USA |
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• Registered on 4/5/2003 |
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• 18 posts |
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Posted:12/9/2003 20:11 |
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Wow...this is great. Thanks much to both of you...and for your time. I tried reseting the computer by disconecting the battery...but still saw no 'Check Engine' light. I drove the truck down to the beach on night last summer, and woke up the next morning and turned the key. Instead of reving up to a cold RPM to warm up the truck, it just dropped down to ~500 and wanted to cut off. I"ve been dealing with it since. "Something is not telling the engine that it is cold and should raise idle."...is exactly the way I would try to explain what is happening. When I start on a cold day, or any day for that matter, the RPM's immediatly drop to as if the truck was idling at warmed up temperature...with only a slight flucuation. This ofcourse causes it to cut off unless I manually raise the RPM's to what they should be when cold. When it warms up, I don't really have this problem that I can think of. What exactly is the MAS. I suppose this is a sensor of some sort. My gauge inicating engine temperature indicates nothing different from when it was working fine. Thanks again for all your help.
Randy |
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LANDYOT
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• Subscriber since 11/23/2003 |
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• Newport News, VA, USA |
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• Registered on 7/15/2003 |
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• 1,110 posts |
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Posted:12/9/2003 21:25 |
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I'm going to guess (without pulling out the service manual) that MAS is something like Mass Air Sensor. It should be mounted between the air filter and the throttle body. My other car calls it an MAP ... Manifold Absolute Pressure. The purpose of the MAS / MAP sensor is to give the computer an idea of the temperature of the air before it enters the intake manifold. With the air temperature, the computer can calculate the air's "general" density to ultimately achieve (another guess here) a 14.7 to 1 air-to-fuel ratio. I don't know which one is more accurate when it comes to considering relative humidity. The 'puter meters the fuel via either frequency of injector pulses, or the amount of time the injector opens its nozzle. With the X's system, it may even advance and/or retard the timing to compensate efficiently (you'll note the absence of a distributor and plug wires on the V10 motor). |
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monsta
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• The Big Island, HI, USA |
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• Registered on 1/5/2002 |
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• 1,056 posts |
• 2 Vehicles
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Posted:12/10/2003 02:17 |
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LANDYOT,
You are correct. 
My question to Randy is "when did this start happening or has it always done this?" Also, what does it idle at when warm? (RPM)
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Randy Kight
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• Richmond, VA, USA |
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• Registered on 4/5/2003 |
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• 18 posts |
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Posted:12/15/2003 09:57 |
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Thanks the replys again LANDYOT and MONSTA. About how much would a replacement MAS be on this truck, and how difficult to replace? MONSTA, the truck seems to idle at the same revs whether cold or warm...maybe slightly lower than it used to before this started. This started last summer after a long trip to the beach. I actually noticed it one morning long before this trip, but it only happened once and returned to normal the next start. Again, thanks for the help, and sorry for the delay...been out of town quite a bit recently.
Randy |
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