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Discussion Starter · #1 ·
Hello all,

This is the second of two posts on the same vehicle.

I have a 99 Ford Explorer 4x4, 4.0 SOHC, 250K miles. Recently the check engine light was on, and a quick scan showed Bank 1 lean. The check engine light has since gone out, but there are some performance issues:

1. Occasionally the vehicle is very hard to start. For example, the other morning I started the vehicle, backed out of the garage, turned the vehicle off, then tried to start it about two minutes later. It would not start until I floored the accelerator.

2. The vehicle occasionally dies at idle, or after decelerating to a stop.

Some random information: I have previously replaced the idle air control, upper and lower intake manifold gaskets, Bosch Platinum+2 plugs have about 30K miles on them, and the tranny was replaced about one year ago.

Any help troubleshooting/diagnosing would be most welcome!

Mike
 

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I can agree with dacofa, and state that those bosch plugs may be platinum but I personally don't like Bosch's performance after about 10K miles... Check the resistance in the plugs and check the cleanliness of them.

FE
 

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Discussion Starter · #4 ·
Thanks for the replies. Is there a definitive test for the fuel pump, or should I just bite the bullet and replace it? Would a clogged fuel filter cause the same behavior?

How do you test resistance on a plug?
 

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Fuel Filter could be plugged, pump pressure maybe low. Can be tested for pressure at the Fuel Rail on the engine. A gauge can be bought or rented at a local shop. The car Book will tell you how much pressure you should have.

Platinum Plugs.... Platinum is a poor conductor for electricity, and that is why they last so long..... a gimic you can do without....
 
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