I have a 1998 F150 4.2l and recently I have been having issues with it starting hard, having to pump the gas peddel about 5 times to get it to start up. After it starts the idle is very rough and stays that way. I have already changed out:

Fuel Pump
Fuel Filter
Coil Pack
EGR Valve
IAC Vavle
Spark Plugs
Spark Plug Wires
PCV Valve
Both rubber elbows for the PCV
Cleaned the MAF


Not sure what to do next, check fuel pressure, check vacuum lines, check the intake gaskets? Does this sound like a fuel issue, or vacuum issue? I dont think its an ignition issue, just acts like it doesnt want to start until you pump the pedel, and once its running its rough, almost like a miss. I have only gotten the codes for a miss fire on cyclinder 3 and 6, and once a code for lean bank 1 or 2 I can't remember which.

Any help is greatly appreciated,

Thanks.

 

Is it using coolant? Have you done a compression test?

 

I do not think it is using coolant up, and no I have not done a compression test yet, plan to this weekend.

 

Ok so I did a compression test on the motor:

60 PSI in two cylenders, 90 PSI in the others.

I also found all the front intake manifold bolts only finger tight, and the fuel pressure regulator had fuel in the vacuum line. I am planning on replacing the long block and any and all sensors that dont give me the warm fuzzy feeling.

Any suggestions on easy ways to pull the motor are appreciated.

 

I'am haveing same problems and changed the same things you did also TPS sensor. also checked pressure on fuel injection rail read 40psi has spark I'm thinking maybe the PATS transponder is messing up and locking out the fuel injectors. my truck would miss or sound like it was running out gas and die, now it won't start at all. If you find out the problem with yours post and let me know thanks.

 

I believe the OP has found that he has low compression - the engine is worn out. I doubt that this is your problem.

 

easiest way for me to pull my engine which i have done several times is to remove radiator and front cap grill cross support etc, it makes for an easier job and doesnt scratch up anything in the process.