hard start - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

Reply
 
LinkBack Thread Tools Search this Thread
  #1  
Old 01-11-2014
Member
Thread Starter
 
Join Date: Jan 2014
Location: goshen in
Posts: 2
hard start

i have a 2001 ranger 3.0 starts good when go to work and when i get off 8 hours later but if go shopping or diner and when i try to start it cranks hard before it starts new plugs wires coil cleaned egr passage helped for a while but problem came back ran seafoam through vacum lines and tank no help
Reply With Quote
  #2  
Old 01-11-2014
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,580
I assume it runs fine warm once it starts?

I would first see if its spark or fuel.

Get some Quick Start(ether in a spray can)

Next time you have a hard start pop the hood pull off a vacuum line and spray ether into intake, PCV or power brake hose are good ones to use, put vacuum line back and try to start, if it still just cranks then spark is the issue, if it fires up then fuel is the problem.

When you turn the key to RUN(on) the computer turns on the fuel pump for 2 seconds to prime the fuel system, and then checks the ECT sensor(engine temperature).
Computer opens IAC valve all the way for starting, this is why idle goes up then drops on every start, if it doesn't then clean IAC Valve.
When you crank the engine the computer looks for the CKP signal(crankshaft sensor), this is what tells the computer to start the spark and the fuel injectors, if CKP fails then it will never start, never heard or even read about an intermittent CKP.

So engine is cranking, if ECT shows cold engine then computer opens injectors longer for richer mix, if ECT shows warm engine then computer opens injectors normally.

Cam sensor, O2 sensors and pretty much any other sensors are ignored at startup, so are off the table as far as causing a problem.

There are a few things to try:
Turn key on count to 3 then turn key off, repeat 3 times, then try to start engine.
What you are doing is building up pressure in the fuel system, if this works then fuel system is losing pressure when truck sits, but I think you would have trouble the longer it sits, not the other way.

Next test, after engine has only been off an hour or so, turn key on, then push gas pedal all the way to the floor and hold it there, this turns on a software routine in the computer to clear a flooded engine, with gas pedal to the floor the TPS(throttle position sensor) will be sending 4.8volts to computer, computer will then turn off the injectors during cranking.
Crank engine for at least 10 seconds, if it starts to fire then there is residual fuel in the intake manifold, there shouldn't be, could be a leaking injector or pulse damper is bad and fuel is coming in via its vacuum line.

Next test, unplug the MAF sensor then try to start, could be MAF is dirty and giving computer incorrect data, this doesn't always give a code, check engine light will come on with MAF unplugged, it will go off when it is plugged back in.

Last edited by RonD; 01-11-2014 at 10:24 PM.
Reply With Quote
  #3  
Old 01-13-2014
Member
Thread Starter
 
Join Date: Jan 2014
Location: goshen in
Posts: 2
i did the turn if the key 3 times it made it not want to start until i pressed down on the gas a little.
did the second test and with the pedal to the floor it started with onlu a second or two of turning over.
so what do i do now
just cleaned the maf sensor a week ago
did find that one of the lines going to the dpfe sensor was bad replaced it and it did help and got gas milage back runs great but still has to crank but not as hard
Reply With Quote
  #4  
Old 01-13-2014
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,580
I would borrow or rent a fuel pressure tester, it reads like fuel is leaking into the intake, probably from one of the injectors.

'01 should have 60-70psi of pressure when running and should hold that pressure after engine is off, if pressure slowly goes down then there is a leak.

The foot to the floor test and the fact the engine started points to that.
With foot to the floor there should be no fuel going into the intake, injectors should be off, so the only way it could start is if there was already fuel in the intake.
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Ranger hard start issue HELP COLD START 1994splash 2.9L & 3.0L V6 Tech 1 06-08-2011 05:27 PM
Hard start in the morning and after driving ramrezz425 4.0L OHV & SOHC V6 Tech 6 04-08-2009 08:22 AM
Hard to start rangerbert 4.0L OHV & SOHC V6 Tech 11 05-09-2008 07:06 AM
Idles rough, and hard to start, Help!! BOxford32 2.9L & 3.0L V6 Tech 2 02-23-2008 07:29 PM
Hard start after cold. Ranger1 General Ford Ranger Discussion 3 12-29-2004 04:14 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -6. The time now is 05:56 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.