Strange Issues with a 89' EB.
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New User
Joined: Mar 2007
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Strange Issues with a 89' EB.
Hi all. I've been thinking of selling my Aero now, as it fulfilled its needs from the past 15 years.
Anyways, I jumped started my aerostar (again), and have a concern from quite a while. I did this in my driveway while in Park.
When ever I applied the throttle, the engine would hesitate immediately, almost wanting to stall, but then it would reach that desired rpm from the given throttle level no problems. I suspect that it might be a failing fuel pump.
Another thing... ok, lets have a contest. How long does it take for your aerostar to show signs of overheating (CEL, maxed out temp gauge) while in Park? For me, it was about half an hour from a cold-cold (sat for 2 months) start. I'm going to have to add some water/antifreeze pronto.
So, whats the bogging about?
Anyways, I jumped started my aerostar (again), and have a concern from quite a while. I did this in my driveway while in Park.
When ever I applied the throttle, the engine would hesitate immediately, almost wanting to stall, but then it would reach that desired rpm from the given throttle level no problems. I suspect that it might be a failing fuel pump.
Another thing... ok, lets have a contest. How long does it take for your aerostar to show signs of overheating (CEL, maxed out temp gauge) while in Park? For me, it was about half an hour from a cold-cold (sat for 2 months) start. I'm going to have to add some water/antifreeze pronto.
So, whats the bogging about?
Lead Driver
Joined: Sep 2003
Posts: 7,014
Likes: 207
From: SoCal
A number of things can cause that initial tip-in stumbling. The most likely is the throttle position sensor being faulty. One of the things the EEC uses it for is to determine throttle opening rate, in order to apply enough fuel enrichment to prevent such a stumble.
The next thing would be the fuel system itself, such as the fuel pressure regulator, or fuel injectors. If the van has been sitting around for a while, then some of these parts may be sticky. You can check the fuel pressure by attaching a gauge to the Schrader valve on the fuel rail. The idle pressure should be around 35 psi, and go up to 40 psi under load. You can run some injector cleaner through the gas tank, or shoot it right into the fuel rail through the Schrader valve.
As to overheating, make sure you have enough coolant in the engine. If it does and it still overheats, even while idling, I would check for a leaky head gasket. Open the radiator cap and see if you can smell fuel in it.
The next thing would be the fuel system itself, such as the fuel pressure regulator, or fuel injectors. If the van has been sitting around for a while, then some of these parts may be sticky. You can check the fuel pressure by attaching a gauge to the Schrader valve on the fuel rail. The idle pressure should be around 35 psi, and go up to 40 psi under load. You can run some injector cleaner through the gas tank, or shoot it right into the fuel rail through the Schrader valve.
As to overheating, make sure you have enough coolant in the engine. If it does and it still overheats, even while idling, I would check for a leaky head gasket. Open the radiator cap and see if you can smell fuel in it.
Postmaster
Joined: Apr 2001
Posts: 3,818
Likes: 3
Low coolant creates an air pocked around the temp sensor as it is located in the highest point in the cooling system. With no coolant against the sensor it reads high. You see this most often on the road. The temp guage will rise then fall back to normal and continue this rise/fall cycling as trapped air is purged then trapped again, etc, etc.
Former ******
Joined: Nov 2004
Posts: 4,901
Likes: 2
From: Salt Lake City, Utah
It cold also be an indication of poor coolant circulation from badly corroded vanes on the water pump. Also if the fan is not working properly, the van may overheat when parked, but be fine when moving.
