raw fuel?
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raw fuel?
I pulled the IAT (Air intake temp. Sensor) to check it out for crud, because Ford decided on the Aerostar 4.0 to put it in the upper intake manifold back by the firewall. When I pulled it out, the tip of the sensor was covered in raw fuel? Should there be raw fuel in the upper intake. I am still trying to cure a rough idle problem. I do not smell fuel when I am driving the van. I do not have anything black blowing out the tailpipe. I am thinking that if there should not be raw fuel in the upper intake, then I may have a faulty Fuel Pressure Regulator, and the vacuum is sucking fuel from it into the upper intake, and the faulty FPR is giving me the crappy idle. Can anyone help me out here? I have changed every sensor on this van, and this idle problem is driving me nuts! My mechanic checked out the van when I bought it, but did not check fuel pressure. I do not have the tool to check it either. So the raw fuel in the upper intake leads me to believe it has been the FPR all this time. Before I go and spend more money on a new one, I will see if any of you have any insight to this problem. Thanks
Freshman User
Joined: Jun 2000
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raw fuel?
This sounds a bit unusual. On some engines, reversion in the intake can cause raw fuel in the intake manifold area, but on a stock cammed, port fuel injection engine, this seems unlikely under normal conditions.
The fuel pressure should be checked. Every possibility must be rulled out.
Rough idle can be caused by many things. Is the idle from a misfire of different cylinders or from one cylinder not firing? (skip) If the rough idle is from a skip,among other causes, a leaking intake valve could cause fuel to be blown back up into the intake. A compression test would determine whether of not a cylinder is sealing properly. In many vehicles today, a skip becomes less noticable as the engine is revved up or the vehicle is driven faster. You might notice a lack of power and a drop in mileage as well.
And on the eighth day, The Lord created the turbocharger
The fuel pressure should be checked. Every possibility must be rulled out.
Rough idle can be caused by many things. Is the idle from a misfire of different cylinders or from one cylinder not firing? (skip) If the rough idle is from a skip,among other causes, a leaking intake valve could cause fuel to be blown back up into the intake. A compression test would determine whether of not a cylinder is sealing properly. In many vehicles today, a skip becomes less noticable as the engine is revved up or the vehicle is driven faster. You might notice a lack of power and a drop in mileage as well.
And on the eighth day, The Lord created the turbocharger
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