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  #1  
Old 06-09-2015, 01:20 PM
nk321810 nk321810 is offline
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Default 03 ranger 3.0 miss under acceleration.

hi.
my truck runs pretty well considering it has 185k. it has a rough idle, which may or may not contribute to this problem: it accelerates fine until it warms up, then if i step on it to pass someone or merge onto the interstate, it falls on its face somewhere between 3 and 4000 rpms. it does the same if i set the cruise on a 70 mph highway and encounter a hill. it seems to be getting worse. the plugs arent new, but i inspected all 6 and they look good. i also know they have around 20k highway miles on them. i tested the coil and found a bad post, so i replaced it with no change in the symptoms. i also just changed the fuel filter a couple days ago...no change there either. theres no engine light on, ive been thinking of unplugging a sensor just to turn it on so advance will scan the codes. so ive got a rough idle (which doesnt really bother me) and a hard stall under heavy acceleration when warm. any ideas?
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  #2  
Old 06-09-2015, 06:14 PM
GLH GLH is offline
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Ever change the camshaft synchronizer ?
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  #3  
Old 06-10-2015, 03:34 AM
nk321810 nk321810 is offline
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Default Re: 03 ranger 3.0 miss under acceleration.

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Originally Posted by GLH View Post
Ever change the camshaft synchronizer ?
Not yet. I have no chirping at all. I was wondering if anyone ever had the synchronizer go bad and NOT chirp?
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  #4  
Old 06-10-2015, 04:52 AM
Vogenitz69 Vogenitz69 is offline
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Quote:
Originally Posted by nk321810 View Post
Not yet. I have no chirping at all. I was wondering if anyone ever had the synchronizer go bad and NOT chirp?
they would need a new engine
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  #5  
Old 06-10-2015, 05:04 AM
oodannyboyoo oodannyboyoo is offline
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Quote:
Originally Posted by nk321810 View Post
hi. my truck runs pretty well considering it has 185k. it has a rough idle, which may or may not contribute to this problem: it accelerates fine until it warms up, then if i step on it to pass someone or merge onto the interstate, it falls on its face somewhere between 3 and 4000 rpms. it does the same if i set the cruise on a 70 mph highway and encounter a hill. it seems to be getting worse. the plugs arent new, but i inspected all 6 and they look good. i also know they have around 20k highway miles on them. i tested the coil and found a bad post, so i replaced it with no change in the symptoms. i also just changed the fuel filter a couple days ago...no change there either. theres no engine light on, ive been thinking of unplugging a sensor just to turn it on so advance will scan the codes. so ive got a rough idle (which doesnt really bother me) and a hard stall under heavy acceleration when warm. any ideas?
try your spark plug wires, had the same issue and it fixed it right away
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  #6  
Old 06-10-2015, 07:25 AM
mrmoerder mrmoerder is offline
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Is that the same as the cam position sensor?
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  #7  
Old 06-11-2015, 06:52 PM
nk321810 nk321810 is offline
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Default Re: 03 ranger 3.0 miss under acceleration.

Quote:
Originally Posted by mrmoerder View Post
Is that the same as the cam position sensor?
No. The cam pos sensor senses the cam synchronzer...at least if it works the same as the one on my 5.0 explorer did...

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Quote:
Originally Posted by oodannyboyoo View Post
try your spark plug wires, had the same issue and it fixed it right away
Thanks I'll give it a shot when I get paid

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Quote:
Originally Posted by Vogenitz69 View Post
they would need a new engine
I was asking if anyone had the same symptoms as me (no chirp), changed the synchronizer, and solved the problem.
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  #8  
Old 06-11-2015, 10:13 PM
GLH GLH is offline
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With that many miles on the engine, the cam sync should be changed just as preventive maintenance.
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  #9  
Old 06-25-2015, 09:02 PM
mxpxpunkrock1987 mxpxpunkrock1987 is offline
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Default Re: 03 ranger 3.0 miss under acceleration.

i would say knock sensor cause if its missing. i would check it. that its located pass next to the oil pan far back bottom.
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  #10  
Old 06-26-2015, 11:08 AM
damned225 damned225 is offline
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With no check engine light, I would check for leaks (air intake, vacuum, voltage). Some leaks may only show up when the motor is warm. Are you having oiling problems? Is there a rust colored dust around the cam sync?
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  #11  
Old 06-29-2015, 11:44 AM
nk321810 nk321810 is offline
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Default Re: 03 ranger 3.0 miss under acceleration.

update:
Changed the plugs and wires..didn't fix the problem, but got +1 mpg's afterwards.
Replaced the cam synchronizer and sensor...Voila! Fixed!
Sooo...the cam sync can be the problem even if it DOESN'T chirp.
Thanks all for the advice.

Side note: The cam sync Did squeak when I had it out in my hands, but never heard anything while it was in the truck. There was also rust dust in the cam sensor, but I attributed that to 185,000 miles of service.

Last edited by nk321810; 06-29-2015 at 11:52 AM. Reason: more info
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  #12  
Old 06-29-2015, 12:38 PM
GLH GLH is offline
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Quote:
Originally Posted by nk321810 View Post
update: Changed the plugs and wires..didn't fix the problem, but got +1 mpg's afterwards. Replaced the cam synchronizer and sensor...Voila! Fixed! Sooo...the cam sync can be the problem even if it DOESN'T chirp. Thanks all for the advice. Side note: The cam sync Did squeak when I had it out in my hands, but never heard anything while it was in the truck. There was also rust dust in the cam sensor, but I attributed that to 185,000 miles of service.
Yep.

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Quote:
Originally Posted by GLH View Post
With that many miles on the engine, the cam sync should be changed just as preventive maintenance.
Yep.
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3.0, cam sensor, cam sync, fuel, miss fire

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