Ford Repair Questions? Ask a Mechanic for Answers ASAP
Hello, are you sure the code is 46? The engine codes should be 3 digits on this model.
it an obd1 and that is what my code reader got
and i had code 26 and 28 too
I understand its an obd1, Most Fords went to 3 digits in the early 90's because of more complex systems. The year model is 1995 correct
yes sir it is a 95
I have to go back to 1993 for 2 digit codes. Can you give me the vin number?
and when i get gas or when i turn the eng off for a short time she doesnt want to start right away and it takes me about 3 to 5 starts till she runs and the idle is around 3000rpm for a bit then goes down to 2000 then 1500 then back to 2500 rpm
Did you buy the truck this way or did you own it for awhile and it just started doing this?
bought it that way
shes a good truck just have to get her running right again
That explains the problem. This truck has the wrong computer in it. Someone replaced it probably with a junkyard unit and that is why you are getting the 2 digit codes instead of 3 digit codes. If you get the number off the computer for me, I can verify this. Thanks
it starts with an f right
yes, the middle numbers are 12A650
yes it is
What is the whole number on your computer tag?
Is this truck manual trans?
yes sir it is
That is the right computer, but I cannot say why you are getting 2 digit codes. It went to 3 digits in 94on the explorer. Try this, unplug the throttle position sensor and see if the idle goes down.
i looking at the 3 digit codes and i think i was reading it wrong when the reader starts i will get 2 beeps then a pause then 8 then another pause i get 4 beeps then 6 beeps so i thought it would mean 28, 26, 46 as the code
would the vin help you too
No, the vin does not matter at this point, we have verified the correct computer is in there. Can you run the codes again with your scanner with the engine off?
that is how i got the codes and i havent gotten a check eng light and i ran the reader again and i got 2 beeps then 8 then along pause i get 4 beeps then 6 beeps and i get 2 beeps then i get 6 beeps
so i think i am getting 26 28 and 46 as the codes
Does the engine light come on with the key on and the engine off?
yes it does
and i think it goes off after awhile i never really payed attention
With those odd codes and no engine light coming on, I think your computer may be bad. It is possible for it to fail and go into a fail safe mode that allows the engine to run, but not operate correctly.
can the computers processor not keep up with the eng and just send the fault codes and the light some times will come on then go right off and one day i was driving the light came on and the idle was normal then the light went off and the idle shot right up
Sounds like the computer is failing. When the light came on, it started working and turned the light on and was able to adjust everything to make the idle right, when the light went off the computer had stopped wotking correctly and everything went haywire again. A cused computer for this truck is fairly cheap and would give that a try. If you want to locate one online, use the link below. It can find you the cheapest preice or the closest to you. Thanks WWW.Car-part.com
sweet and that was the next part i was going to change and i have to have the same eng code right and what if this doesnt fix the idle problem
After you accept this question, it will stay open for about 2 weeks in case you have any follow questions. So you can still contact me after the repair. Thanks
Have you checked to see if this computer has any codes? Thanks
Take a pair of pliers and squeeze the brake booster vacuum hose, see if the idle speed changes. then squeeze the pcv hose and see if it makes any difference. Thanks
Disconnect the hose from the fuel pressure regulator and see if any fuel is coming out where the vacuum line hooks on. If there is no fuel leaking, then hook it back up and unplug the idle air control valve and see what rpm the engine runs at or if it dies. Thanks
Have you replaced the upper intake gasket and the gasket between the injector fuel rail and the lower intake? If you took the vacuum line off the regulator and it idled lower, that indicates a vacuum leak.
Does the a/c work?
I want you to unplug the idle control valve and see if it will idle on its own. If it does, leave it idling and see if it stays the same speed or if the idle speed fluctuates as it does now.
The should go down when it disengages and up when it is engaged. Try backing the throttle stop screw off 1/2 turn. Repeat this backing off 1/2 turn at a time until it stops making an idle speed change, Let me know if at any point the idle is correct? If it is, then stop turning it.
Have you ever checked the fuel pressure?
That is the minimum pressure. Was that with the engine running or just turning on the key? Also, did you have the gauge hooked up while the problem was ocurring?
The only thing I can think of would be the MAP sensor.
Check for codes again to see if there is anything there.
My thinking, is if they were all simple, I wouldn't have a job. Have to go with bad and the good, or rather the pull your hair out and scream or the easy fixes. Thanks and hope all stays working well for you. Thanks
No, the connector where the small wires hook on is different. You have to stay with the same as what is on there already.