Ford Repair Questions? Ask a Mechanic for Answers ASAP
Have we checked for codes in the computer? Have we done a key on engine off test? Key on engine running test?
Have we checked fuel pressure? Does fuel pressure hold? fuel pressure regulator?
Have we ohmed out the coolant temp sensor?
Well, fuel pressure is a vary important thing to check especially on hard starts like you have.
if you get me your engine size, I will get you the fuel pressure and resistance specs of the temp sensor.
Fuel pressure is Key On Engine Off 35 - 45 psi and Key On Engine Running 30 - 40 psi
The temp sensor readings are as follows:
177 ohms at 212 deg F 241 ohms at 194 deg F 332 ohms at 176 deg F 467 ohms at 158 deg F 667 ohms at 140 deg F 973 ohms at 122 deg F 1459 ohms at 104 deg F 2238 ohms at 86 deg F 3520 ohms at 68 deg F 5670 ohms at 50 deg F 9420 ohms at 32 deg F 16180 ohms at -14 deg F 28680 ohms at -4 deg F 52700 ohms at -22 deg F 100700 ohms at -40 deg F
that is good for now, I'll give check the reading now cold engine and when its hot, with current thermostat I suppose it's around 200* Tomorrow we go to a friend home 40 miles away and it usually acts up there and will get back to you like on saturday. tahanks for the values and we will see what happens. I do hope it is just the coolant sensor.
Let me know what you find!
according to my chilton book lol it says that it is the coolant sensor, I'm probing the rubber cap post to ground and got 20 ohmes where as I should get around 4K ohmes. I'll check my 2004 expodition and see what that one reads.
Here is what my referances say.
The Engine Coolant Temperature Sensor is mounted at the front of engine, left of throttle body.
my 2004 is a 5.4, too much mess to get to sensor so will visit neighbor and read his sensor.
I finally found the darn sensor, incovienient to get to in order to get values. Now I know why it cost an arm and 2 legs to get things fixed. I'll go ahead and replace the coolant sensor and go from there. I had the fuel pump and regulator replaced 2 years ago, proably ought to look there first. lol Cheap replacement stuff, I did not do that, I paid 1k for the fuel pump repair, STUPID ME. It was 117 down in Phoenix at the time and I did not want to sweat it. lol. If the coolant sensor will fix the problem I'll accept your input, till then it's an ongoing problem.
Have a good weekend.
But I would rather have you test the sensor to be sure its bad so that we are not replacing parts that are not needed.
But its your car and your money. Suit yourself. I just don't want you to be made at me if this does not take care of the problem.
I hope you understand what I am trying to say. Please don't think that I am trying to be rude in anyway. I just want to get this thing fixed for you as cheap as possible!
No problem, I read how to test the thing, removal, put in water on stove top, heat water, watch ohm meter. It also said old coolant can cause the problem. The antifreeze it two years old. I do not mind replacing parts, it's the same thing a mechanic would do, and I do not have to pay for their incopendience(guess work), just as I(we) are about to do. So hey, I've got no problem. Thankful for any help. It is a closed loop and anything in the loop can cause a problem. Like I said I've swapped out the throttle bypass as of now, still testing, should know the result of that tomorrow before I (we) advance to the next replaceable part.
If its fine with you, its fine with me!
Let me know how it turns out!
Bad gas would cause the engine run rough all the time, not just on start up.
If you accept my answer, the question does not automatically close. We can still continue our conversation until we get this thing fixed.
So if I accept your answer and the problem (hard starts when the engin is warm) still exists you will help me with advise even though I accept your answer? Seems like I have no way to converse with you unless we do it out of answer help?
my email address is XXXXX@XXXXXX.XXX. So far the car hasn't had the problem after I swapped out the by-pass unit.
SOrry for the delay!
I would love to help contact you outside of the site, however, Just Answer does not allow contact between the experts and customers/clients outside of the site when dealing with your question.
YES... if you accept my answer now, we can still continue our conversation and I can and will continue to help you until this problem is solved.