4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

1999 Ranger 4.0 OHV crank no start

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  #51  
Old 07-09-2020
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That's just an adjustment, the no crank in Park, shifter in the cab is loose

Refresh the gang, when it does crank have you sprayed fuel into the intake and does it start, the 50/50 test?



 
  #52  
Old 07-09-2020
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No start with ether or otherwise. Just cranks. I have spark and fuel now. So FORScan fixed the pats issue
 
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Old 07-09-2020
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If there is no start with "ether" then you don't have spark at the right time or you don't have compression, simple as that

Engines are very simple to diagnose, gasoline engines needs 3 things
1. fuel, with air
2. Spark, at the right time
3. compression, above 100psi

If you spray fuel into the engine and it doesn't start up, then you are down to spark and compression
You say there is spark
So its a compression issue
 
  #54  
Old 07-09-2020
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Just pulled the plugs and checked for spark again. 1 and 5 didn’t have spark.

 
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  #55  
Old 07-09-2020
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Well none have spark if engine didn't start with "ether", if even one spark plug was working engine would at least Fire, sound like it wants to start

Its very hard to test spark on a Coil Pack engines, spark plugs are in series

If you have a compression gauge I would test a few cylinders, 150psi is expected, just to take that off the table, or find out it is the problem and you can go from there






 
  #56  
Old 07-10-2020
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Only checked passenger side, cylinders 123

3 - 90
2 - 60
1 - 90
 
  #57  
Old 07-10-2020
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OK, a little confused

You posted this earlier?

Just ran another another compression test with a helper

c1 - 130 c4 - 110
c2 - 160 c6 - 140
c3 - 110 c5 - 130
C2 was higher than C1 and C3 ??
Now its 30% lower


 
  #58  
Old 07-10-2020
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I am too, I replaced the top end gaskets, while I was in there, along with valve stem seals. I would assume compression would be better?

The timing chain was pretty straight forward, so I know I didn't mess it up.
 
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Old 07-10-2020
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Well I would start by pulling the valve covers and checking the pushrods, make sure you can spin them with fingers when valve is closed
 
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Old 07-10-2020
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If pushrods don’t spin, what would that tell me?
 
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Valve are not closing as they should so lower compression, and you can also double check valve timing
 
  #62  
Old 07-11-2020
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Pushrods don’t spin, or barely spin.
 
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Old 07-11-2020
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You should be able to spin them with fingers but only when that valve is fully closed, yes it can be hard to spin but should spin
You have to rotate the engine/crank to check all 12

You can check the valve timing by checking the timing mark on crank pulley and adding a mark(tape) 180 deg opposite the timing mark
#1 and #5 are matched sets, the pistons go up and down at the same time, to balance the engine
The timing mark is associated with #1 and #5 piston being up all the way, TDC(top dead center)
The intake and exhaust valve are closed for 360deg of crank rotation on that cylinders compression and power stroke
But that 180deg starts with #1 or #5 piston down all the way, which is why you add a mark 180deg opposite TDC mark

4 stroke engine
Intake stroke, intake valve starts to open just after TDC mark, as piston goes down it sucks in air/fuel mix, intake valves starts to close as you approach 180deg mark BDC(bottom dead center)

Compression stroke, both intake and exhaust valve are fully closed piston is going up compressing the air/fuel mix

Power stroke, both valves still closed, spark plug has ignited the air/fuel mix, and piston is being pushed down by the explostion

Exhaust stroke, intake and exhaust valves have been closed for 360deg now, BDC to BDC, exhaust valve now starts to open as piston goes up, pushing out the burnt air/fuel mix

Back to intake stroke, TDC mark, exhaust valve just closed and intake valve is opening again



 
  #64  
Old 07-11-2020
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Went through and checked all pushrods, They all spin.

I am an confused on how to check valve timing. I though you could set valve timing on that engine?
 
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Old 07-11-2020
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With the timing cover off you can check it

Try another compression test first, you should get 150+
All spark plugs should be out to get best test, faster crank speed

 
  #66  
Old 07-15-2020
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Compression test gave me:

3) 110 4)110
2) 90. 5) 150
1) 120. 6) 60
 
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Old 07-15-2020
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Looks like you have some valve issues
But #5 should fire when fuel is added, wouldn't be enough to start but should make a noise like starting

 
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Old 07-15-2020
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The engine sounds like it wants to start, But just won’t crank over.

Would you recommend replacing the valves?

the ends of some pushrods were worn, but I don’t think that affects compression?

 
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Old 07-15-2020
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It depends on how much they were worn, if intake valve then not as much air is sucked in, but no, engine would have been "ticking" like crazy if they were worn that bad

Yes, heads come off and go to a machine shop to get a valve job and surfacing

 
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  #70  
Old 07-17-2020
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Lots of useful information and knowledge in here. Thanks for the reading. Where are we at with this project?
 
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Old 07-17-2020
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Heads are currently at a machine shop getting a rebuild. It’ll be about a week.
 
  #72  
Old 07-27-2020
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Originally Posted by matt_groulx
Heads are currently at a machine shop getting a rebuild. It’ll be about a week.

Did you get the heads back yet?
 
  #73  
Old 07-27-2020
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The shop opened back up, Both heads were cracked
 
  #74  
Old 07-27-2020
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update. I will be getting new heads through the same shop tomorrow. in the mean time I have replaced the shift tube on the column, and the cable. how to I adjust these things so the truck will shift into park? I just cant seem to figure out where exactly to adjust it.
 
  #75  
Old 07-27-2020
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The cable adjustment is on the transmission.

There is a bit of an art to it, so trial and error is where DIY ends up, lol

Fords way, MAKE SURE TIRES ARE BLOCKED!!!!!!
Cable/Bracket Adjustment

1. Place the gearshift lever (7210) in the (D) position and hang a 1.4 kg (3 lb) weight on the shift control selector lever.

Move the gearshift lever to the first gear position, then move back two detents to the (D) position.

Hang the 1.4 kg (3 lb) weight on the gearshift lever.

2. Raise and support the vehicle; refer to «Section 100-02».

3. Disconnect the transmission shift cable from the manual control lever (7A256).

4. Pull out the transmission shift cable adjustment lock on the shift cable body.

5. Place the manual control lever in the (D) position.

5.1 Rotate the manual control lever fully counterclockwise.

5.2 Rotate the manual control lever clockwise to the (D) position. (2 detents).

6. Connect the transmission shift cable to the manual control lever.

7. Push in the transmission shift cable adjustment lock on the shift cable body.

8. Note:
If equipped with air suspension, reactivate the system by turning on the air suspension switch.

Lower the vehicle.

9. Remove the 1.4 kg (3 lb) weight.

10. CAUTION:
To prevent damage, do not adjust the transmission shift cable in any position other than (D).

Verify that the vehicle will start only in P or N and that backup lamps illuminate in R. If not, repeat steps 1 through 7 and perform a digital transmission range sensor alignment; refer to «Section 307-01A» or «Section 307-01B».
Now most people don't have a 3lb weight hanging around, lol
But, remember the elementary school rhyme.........."A pints a Pound the world around", so 3 pints of water = 3lb
Use a container with 3 pints of water and hang it on the shifter

The Display in the dash for P R N D 1 2 is adjusted in side the steering column and should only be adjusted AFTER the cable is done and correct
 
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