Rough from Park to 35MPH Help - 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 08-20-2015
Member
Thread Starter
 
Join Date: Aug 2015
Location: Kansas City, KS
Posts: 3
Rough from Park to 35MPH Help

98 Ranger 4x4, 3.0, 142K miles, auto;
Problem- when the vehicle is placed in any gear the engine loses power and runs rough until it gets to about 35 MPH.

Engine idles great
Engine starts great
When put to the floor at high RPMs runs great

What i have done:
Replaced: wires, plugs (gapped at .045), fuel filter, EGR Valve, air filter
Cleaned a ton of gunk out of the throttle body
Sea Foamed the Fuel system two tanks of fuel (not the bottom end)

Any help will assit me at this time!

thanks
BION
Believe it or Not
Reply With Quote
  #2  
Old 08-21-2015
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,606
Have a look at the CPS(cam position sensor) it is at the back top of the engine where distributor used to be.
The CPS and the synchronizer it sits on are good for 80-100k miles and should then be changed.

CPS helps computer with spark advance and fuel injector timing.
A problem here would usually cause CEL(check engine light) to come on.

Does your CEL come on when key is first turned on and then go out after a few seconds?
That is the computer doing a self test.
If it does then all is well, if not then bulb could be bad and you do have codes that need to be checked.

Also remove EGR valves vacuum hose and plug it, then drive truck and see if it works better.
And you should get a CEL for this after engine warms up, and EGR valve isn't opening(EGR valve isn't used when engine is cold).
This tests the EGR vacuum solenoid, computer opens this solenoid to send vacuum to EGR valve
And also the DPFE sensor, this sensor tells computer if EGR valve is opening and by how much.

Last edited by RonD; 08-21-2015 at 10:10 AM.
Reply With Quote
  #3  
Old 09-08-2015
Member
Thread Starter
 
Join Date: Aug 2015
Location: Kansas City, KS
Posts: 3
Found It

Was none of the above,
Did a compression test on it this weekend; seems the number 6 cyl is low on compression (120 PSI when the rest are at 150). Put a few squirts of oil in the hole and tested again read 150; shows its the rings. Going to run it till it blows or find a 3.0 that is good.

If any one has a GOODd 3.0 in the KC area give me a shout!

Thanks
BION
Reply With Quote
  #4  
Old 09-08-2015
RF Veteran
iTrader: (1)
 
Join Date: Jan 2014
Location: Vancouver, BC
Posts: 7,606
low power and partial misfire on one cylinder would sure cause a vibration.

Thanks for posting the update

3.0l Vulcan engines also came in Taurus and Sables up to '07 for Taurus and '05 in Sables, they were transverse mounted but block and heads are the same, cam has more HP but less torque, most who have used car 3.0l said they couldn't tell a difference.
In '98 taurus and sable got 3.0l Duratec DOHC engine as a upgrade option, so if looking make sure you are seeing Vulcan 3.0l, Duratec won't work

Vulcan 3.0l was used in Rangers and B3000 until '08 and '07 repectively

Last edited by RonD; 09-08-2015 at 10:29 PM.
Reply With Quote
  #5  
Old 09-11-2015
cheese_man's Avatar
Member
iTrader: (1)
 
Join Date: Nov 2009
Location: arthur
Posts: 2,100
you might try the ATF fluid flush trick

the #6 cylinder piston rings might just be stuck in the compressed position from sludge build up
Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
2003 3.0 Ranger - rough low idle (400 rpm), bogs at 2500K, rough shift, NOW FINE ChargerOnDavins 2.9L & 3.0L V6 Tech 3 03-23-2015 04:25 PM
M5OD rough shift on rough roads, potholes, speed bumps Mike_92 Drivetrain Tech 0 10-28-2013 10:26 PM
Radio only plays in park?? Help Bailey General Technical & Electrical 41 08-18-2011 09:33 PM
1997 Mazda b2300 starting rough, running rough! bonecrusher SOHC - 2.3L & 2.5L Lima Engines 3 03-19-2011 05:04 AM
HELP!! abs/park brake lights 93-danger-ranger General Technical & Electrical 7 12-16-2009 09:46 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 02:33 AM.


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.