3.0 Bucking at 3500rpm

[gdlegion]

Hi guys, I have a weird problem I'm trying to track down.

my 2001 Ranger Edge 3.0L Vulcan (Manual Trans) is having trouble going over 3500 rpm in ANY gear, seems to happen at exactly 3500 rpm in every single gear, will accel fine up to that engine speed, but then it bucks like crazy and loses all power. Seems to happen after it warms up, doesnt act up at all when it's cold. I replaced my Coil pack and that seemed to help the engine a bit, but no change in the bucking/shuddering. I get NO codes which is driving me up the wall. Rev limiter, vacuum/EVAP? what do you guys think.

Any ideas? anyone heard of this shit happening at an exact engine speed??

I'm starting to suspect catalytic converter or fuel issue.

 

[Dirtman]

Replace the fuel filter step #1, check fuel pressure step #2.

If fuel pressure checks out ok after replacing the fuel filter run a vacuum test for exhaust restriction (bad cat/muffler).

 

[gdlegion]

Ah I fixed it guys.

TPS and a new coil pack and she’s roaring

 

[gdlegion]

Replace the fuel filter step #1, check fuel pressure step #2.

If fuel pressure checks out ok after replacing the fuel filter run a vacuum test for exhaust restriction (bad cat/muffler).

I will swap out the fuel filter tomorrow. Just put in a TPS and coil pack and she’s good as new

 

[NIGERIAN RANGER]

Let's know how it went pls

 

[mikkelstuff]

My 2002 3.0L had similar behavior. A camshaft synchronizer solved the problem. If you change it, pay more for a Motorcraft unit. I didn't and had to replace the cheap Dorman synchronizer after only one year.

 

[gdlegion]

My 2002 3.0L had similar behavior. A camshaft synchronizer solved the problem. If you change it, pay more for a Motorcraft unit. I didn't and had to replace the cheap Dorman synchronizer after only one year.

Hmm, still bucking once in a while, I replaced the IACV, and the Fuel Filter as well, Truck runs way better. I will replace the Cam Synchro soon and let you know if that did it.