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-   -   03 ranger 3.0 miss under acceleration. (http://www.fordrangerforum.com/3-0-vulcan-tech/128437-03-ranger-3-0-miss-acceleration.html)

nk321810 06-09-2015 01:20 PM

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?

GLH 06-09-2015 06:14 PM

Ever change the camshaft synchronizer ?

nk321810 06-10-2015 03:34 AM

Re: 03 ranger 3.0 miss under acceleration.
 
Quote:

Originally Posted by GLH (Post 2480764)
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?

Vogenitz69 06-10-2015 04:52 AM

Quote:

Originally Posted by nk321810 (Post 2480972)
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

oodannyboyoo 06-10-2015 05:04 AM

Quote:

Originally Posted by nk321810 (Post 2480554)
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

mrmoerder 06-10-2015 07:25 AM

Is that the same as the cam position sensor?

nk321810 06-11-2015 06:52 PM

Re: 03 ranger 3.0 miss under acceleration.
 
Quote:

Originally Posted by mrmoerder (Post 2481040)
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...

----------

Quote:

Originally Posted by oodannyboyoo (Post 2480992)
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

----------

Quote:

Originally Posted by Vogenitz69 (Post 2480990)
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.

GLH 06-11-2015 10:13 PM

With that many miles on the engine, the cam sync should be changed just as preventive maintenance.

mxpxpunkrock1987 06-25-2015 09:02 PM

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.

damned225 06-26-2015 11:08 AM

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?

nk321810 06-29-2015 11:44 AM

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.

GLH 06-29-2015 12:38 PM

Quote:

Originally Posted by nk321810 (Post 2493266)
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.

----------

Quote:

Originally Posted by GLH (Post 2482314)
With that many miles on the engine, the cam sync should be changed just as preventive maintenance.

Yep.


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