1990 F150/5.0 wont start in mornings but starts easily in evening hours.?

Question

The truck just cranks over but wont start for hours in the morning. In the late afternoon it will start fine with no hesitation. Is it an emissions or electrical problem? Please help!

Answer 1

Try holding your foot on the gas pedal, pushing it down about an inch when cranking first thing in the morning. If this allows the truck to start, you have a sticking idle air control valve. The cool morning causes it to stick closed, as it warms up later in the day, the valve does also, and frees itself, allowing it to start in the warmer afternoon. Check the Idle Air control valve.

Answer 2

No, it is not an electrical or emission problem. In the morning the crank of the truck is cold. Thus it takes time to rotate the heated oil in the crank with the help of heater plug.

While in the afternoon the crank is at the normal temperature (moderate temperature). Thus it does'nt take much time to rotate the oil in the crank.

To avoid this i recommend u to use appropriate kind of oil suitable for ur climatic conditions.
& remember- At the end of the day when u keep the vehicle for rest just accelerate the pedal several times before switching it off.

Hope u find it better.

Answer 3

It could be the idle air control valve, clean it or replace it..it is located right next to the throttle body on the newer trucks. Also the next thing on a truck that age would be the fuel pump, I am guessing a 1990 would be new enough to have an electric one in the gas tank and fuel injection.. they do get weak and cause start problems.

Answer 4

Ive observed you havent pronounced something on the subject of the alternator it ought to b goin out yet particular examine connectors, grounds, and additionally fuses and additionally examine each and each spark plug make effective they arent swimming in oil that could reason ur vehicle to close off if thats the case replace valve gasket o ther than examine gas lines for any symptoms of broken or pinched spots additionally examine the place the gas pump is placed and do a attempt by capacity of having yet another physique in drivers seat to CYCLE the main do no longer turn on motor vehicle OR CRANK in basic terms CYCLE IT and previously the different physique does so loosen the line closest to the gas tank and notice if gas is going by way of while u cycle then reconnect the line if gas is goin by way of freely (placed on protection GLASSES while DOING SO NO gas gets IN EYES AND some thing to hide nostril AND MOUTH) circulate to the hood elevate up locate gas line do the comparable technique throughout returned now it incredibly is a at abode attempt be effective to check if the gas is shifting freely or if no longer you have pinch someplace and continuously have a returned up wrench to disconnect the lines (if mandatory)

Answer 5

nothing is wrong with your truck. it is just much more harder to start a engine in the morning compared to a evening. the reason for this is that the truck's engine gets cold overnight and it has difficulty warming up enough to start on the first try. some of the newer cars have engine warmers which make it easier to start a car in the cold. the reason it is much easier in the evening is because the truck has probally been driven and the engine is still warm enough, and the tempature is not as cold as in the morning.

Answer 6

Sounds like me. It's not a morning truck

Answer 7

its colder in the mornings, and more humid, could be a problem with older trucks, maybe the starter. have it checked out, my mechanic played with the reving on my truck and now it works fine

Answer 8

3 things to check!
1- inspect and clean plenum for fresh air intake (they gum up, is a spray cleaner)
2- check exhaust sensor and catylitic converter
3- check your coil