So I have done a basic tuneup of my truck plugs wires rotor coil.
fixed a oil leak. and now found a coolant leak. possible water pump. thats getting fixed this week.

however there is one more problem. My starting issue has not gone away.

When I first start it during the morning it fires up no problem. however if I go to a store and come out 30 minutes later and turn the key it takes awhile to crank over. So I have no clue what it is. it is obviously fuel related. the spark is getting to the engine. The mechanic that worked on my truck said it is running a bit rich. My uncle says it could be my fuel regulator. My father thinks its the fuel filter. A guy on this site said he had the same issue and it turned out to be a cracked injector and needed to replace them. fuel filter is minor. Fuel regulator? I know what it does but where is it on the 302? and if it is my injectors that is alot of money. now if it turned out to be injectors would replacing them with say 24lb instead of 19 give me more horse with a tune? and replacing the fuel regulator where is it on these engines and can I get more horse from it?

I want more horsepwer but I just want everything to be working mechanically from my truck first before I do that.


my bad forgot details to truck 92 f-150 302 speed density e4od etc

 

Bigger injectors just have the capability to flow more fuel over the same pulse width. They will not give you any more power than the smaller injectors could, assuming everything else with the engine remained the same. The airflow hasn't changed, so there is no need for any additional fuel.

 

Why do people think dumping more fuel into the engine will make it go faster?

Also, why are you convinced your problem is fuel related? When you say it takes a while to crank over, what exactly does that mean? Is it only after 30 minutes of sitting? What about 5? 10? 45?

A fuel pressure gauge will rule out the filter and the fuel pressure regulator.

 

The fuel pressure regulater is located on the fuel injection feed rail and it has a vacuum line attached. Running rich could be fuel or ignition.
regards
rikard

 

How is the ignition system going to cause a rich condition? If there is no spark then you have a spark missfire and HC going out the exhaust. If there is spark then you get combustion assuming there is compression, air/fuel mixture and that the spark is properly timed. Either way, the ratio of air to fuel does not change thus spark will not cause a rich condition.

 

An ignition misfire creates a lean signal at the O2 sensor from the unburned O2 in the exhaust and the computer enriches the mixture to compensate. It would only do this in closed loop, though.

 

How's the mileage? If it starts good cold and not when hot, check the ECT. Maybe you are running in open loop because the ECT is bad.

 

ECT? what is that?

 

the idea of bigger injectors came from Diesel engines. I am a diesel guy at heart and I find these engines much more confusing then anything else.

 

OK, so the spark missfire in an indirect way can cause a rich mixture only because of the way the computer gets it's feedback in closed loop. I did not think about that.

 

ECT:Engine Coolant Temp