Need help diagnosing
Thread Starter
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4wd Low
Joined: Oct 2023
Posts: 12
Likes: 1
From: Florida
Need help diagnosing
I have a 2000 Ford f150 4.2 engine ,195k odometer.. Manual transmission
The issue I'm having is that as I'm driving the vehicle when I reach a certain speed in first gear I can get up to about 5 mph and then the car will start jerking violently. When I go up to 2nd gear I can make it to about 10 mph and then the car will start shaking violently. When I shift the vehicle to third gear I can get to about 20 miles per hour before it starts shaking violently. In fourth gear I can get to about 30 mph and it does the same thing. This morning on the way to work it was driving just fine and about 5 to 10 minutes from reaching my destination it started doing the violent shaking again I don't know if it's the catalytic converter or something simple like a sensor or something.
I've already replaced the purge control valve, as well as the EGR valve on the truck. I've also checked the spark plugs and replaced them.
Any knowledge or insight from you guys will be completely helpful because they already want $900 for a catalytic job on this truck and I cannot afford that.
The issue I'm having is that as I'm driving the vehicle when I reach a certain speed in first gear I can get up to about 5 mph and then the car will start jerking violently. When I go up to 2nd gear I can make it to about 10 mph and then the car will start shaking violently. When I shift the vehicle to third gear I can get to about 20 miles per hour before it starts shaking violently. In fourth gear I can get to about 30 mph and it does the same thing. This morning on the way to work it was driving just fine and about 5 to 10 minutes from reaching my destination it started doing the violent shaking again I don't know if it's the catalytic converter or something simple like a sensor or something.
I've already replaced the purge control valve, as well as the EGR valve on the truck. I've also checked the spark plugs and replaced them.
Any knowledge or insight from you guys will be completely helpful because they already want $900 for a catalytic job on this truck and I cannot afford that.
Super Moderator
Joined: Apr 2004
Posts: 34,472
Likes: 2,799
Your truck is an OBDII model. You need to plug in a code reader and see what it says.
A bad cat won't cause what you're talking about.
From your description, it sounds RPM related--
Have you noticed if it's roughly the same RPM each time?
Any work to clutch or transmission?
A bad cat won't cause what you're talking about.
From your description, it sounds RPM related--
Have you noticed if it's roughly the same RPM each time?
Any work to clutch or transmission?
Thread Starter
|
4wd Low
Joined: Oct 2023
Posts: 12
Likes: 1
From: Florida
Your truck is an OBDII model. You need to plug in a code reader and see what it says.
A bad cat won't cause what you're talking about.
From your description, it sounds RPM related--
Have you noticed if it's roughly the same RPM each time?
Any work to clutch or transmission?
A bad cat won't cause what you're talking about.
From your description, it sounds RPM related--
Have you noticed if it's roughly the same RPM each time?
Any work to clutch or transmission?
Thread Starter
|
4wd Low
Joined: Oct 2023
Posts: 12
Likes: 1
From: Florida
Trending Topics
Super Moderator
Joined: Apr 2004
Posts: 34,472
Likes: 2,799
P0300
Random misfire. I see you swapped plugs, what about COP or wires?
P0320
Engine speed circuit problem. Similar problem here:
https://www.ford-trucks.com/forums/6...e-jerking.html
Check connections, anything to do with ignition, including COP and related wiring
P0455
EVAP leak. Check gas cap and filler neck, plus charcoal cannisters and connections including all lines to intake for vacuum or fumes.
P0401
Insufficient EGR flow. Related post:
https://www.ford-trucks.com/forums/2...r-flow-26.html
P0174
Too lean. Check for vacuum leaks which could also be related to your EVAP issue.
https://www.ford-trucks.com/forums/7...ode-p0174.html
Random misfire. I see you swapped plugs, what about COP or wires?
P0320
Engine speed circuit problem. Similar problem here:
https://www.ford-trucks.com/forums/6...e-jerking.html
Check connections, anything to do with ignition, including COP and related wiring
P0455
EVAP leak. Check gas cap and filler neck, plus charcoal cannisters and connections including all lines to intake for vacuum or fumes.
P0401
Insufficient EGR flow. Related post:
https://www.ford-trucks.com/forums/2...r-flow-26.html
P0174
Too lean. Check for vacuum leaks which could also be related to your EVAP issue.
https://www.ford-trucks.com/forums/7...ode-p0174.html
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Thread Starter
|
4wd Low
Joined: Oct 2023
Posts: 12
Likes: 1
From: Florida
P0300
Random misfire. I see you swapped plugs, what about COP or wires?
P0320
Engine speed circuit problem. Similar problem here:
https://www.ford-trucks.com/forums/6...e-jerking.html
Check connections, anything to do with ignition, including COP and related wiring
P0455
EVAP leak. Check gas cap and filler neck, plus charcoal cannisters and connections including all lines to intake for vacuum or fumes.
P0401
Insufficient EGR flow. Related post:
https://www.ford-trucks.com/forums/2...r-flow-26.html
P0174
Too lean. Check for vacuum leaks which could also be related to your EVAP issue.
https://www.ford-trucks.com/forums/7...ode-p0174.html
Random misfire. I see you swapped plugs, what about COP or wires?
P0320
Engine speed circuit problem. Similar problem here:
https://www.ford-trucks.com/forums/6...e-jerking.html
Check connections, anything to do with ignition, including COP and related wiring
P0455
EVAP leak. Check gas cap and filler neck, plus charcoal cannisters and connections including all lines to intake for vacuum or fumes.
P0401
Insufficient EGR flow. Related post:
https://www.ford-trucks.com/forums/2...r-flow-26.html
P0174
Too lean. Check for vacuum leaks which could also be related to your EVAP issue.
https://www.ford-trucks.com/forums/7...ode-p0174.html
Thread Starter
|
4wd Low
Joined: Oct 2023
Posts: 12
Likes: 1
From: Florida
I'll give it a look tomorrow, I'll tell you what I find, thanks for everything
Thread Starter
|
4wd Low
Joined: Oct 2023
Posts: 12
Likes: 1
From: Florida
Turned out to be the crankshaft sensor, drives like brand new now
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