4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

p0340 code

Thread Tools
 
Search this Thread
 
Old 01-29-2007, 12:07 AM
  #1  
SNORX302
1st Gear Member
Thread Starter
 
SNORX302's Avatar
 
Join Date: Jan 2005
Location:
Posts: 140
Default p0340 code

I started my car this morning and it sounded like it misfired on startup-it never actually started the first time. I waited a few seconds and started it again and it started right up. Drove to work and the car sat for 7 hours. Started the car again-it was fine, but it felt like it was bucking here and there at random rpms-like timing was being pulled. I parked and started the car soon after. The car did the misfire popping sound again and wouldnt start. I cranked it again and it started and ran for a few seconds, then died. I waited again, started it and ran but i threw a CEL. The code is for cam positioning sensor-circuit malfunction...any idea what could cause this and if I'm guaranteed that it is my sensor. Secondly, where is the sensor located?
SNORX302 is offline  
Old 01-29-2007, 12:38 AM
  #2  
tims 88 4
4th Gear Member
 
tims 88 4's Avatar
 
Join Date: Mar 2006
Location:
Posts: 1,659
Default RE: p0340 code

A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly

Symptoms may include:
[ul][*]the engine may be harder to start[*]the engine may stumble / stumble, and/or hesitate[*]other symptoms may also be present [/ul]
A code P0304 may mean that one or more of the following has happened:
[ul][*]Faulty spark plug or wire[*]Faulty coil (pack)[*]Faulty oxygen sensor(s)[*]Faulty fuel injector[*]Burned exhaust valve[*]Faulty catalytic converter(s)[*]Running out of fuel[*]Poor compression[*]Defective computer [/ul]
Possible Solutions

If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors

i found this on the net i think it should help
here is the site i got it from
http://www.obd-codes.com/trouble_cod...e-detected.php
tims 88 4 is offline  
Old 01-29-2007, 12:45 AM
  #3  
SNORX302
1st Gear Member
Thread Starter
 
SNORX302's Avatar
 
Join Date: Jan 2005
Location:
Posts: 140
Default RE: p0340 code

not 304---340
SNORX302 is offline  
Old 01-29-2007, 12:51 AM
  #4  
tims 88 4
4th Gear Member
 
tims 88 4's Avatar
 
Join Date: Mar 2006
Location:
Posts: 1,659
Default RE: p0340 code

P0340 Camshaft Position Sensor Circuit Malfunction
po340- camshaft position(CMP) sensor A, bank 1- circuit malfunction
inspect the wiring to the cam sensor, possible the sensor is faulty as well


tims 88 4 is offline  
Old 01-29-2007, 04:38 PM
  #5  
SNORX302
1st Gear Member
Thread Starter
 
SNORX302's Avatar
 
Join Date: Jan 2005
Location:
Posts: 140
Default RE: p0340 code

does anyone know where this sensor is located?
SNORX302 is offline  
Old 01-30-2007, 12:53 AM
  #6  
SNORX302
1st Gear Member
Thread Starter
 
SNORX302's Avatar
 
Join Date: Jan 2005
Location:
Posts: 140
Default RE: p0340 code

I found and replaced the sensor, but I am still having the startup issues. I also erased the code after changing the sensor, but the code came back again. Somebody have an idea of what my car is doing to me?
SNORX302 is offline  
Old 01-30-2007, 01:47 AM
  #7  
Brute03
5th Gear Member
 
Brute03's Avatar
 
Join Date: Jan 2006
Posts: 2,504
Default RE: p0340 code

okay, you're gonna owe me big for this one.........


it's your alternator, more specificaly the voltage regulator, sounds crazy huh? i had the same thing happen to me a few months ago and none of the mechs could figure it out. the car would start, backfire, then die but start right up on the second try. after lots of research, i told the mech to check the alt. and it fixed the problem
Brute03 is offline  
Old 01-30-2007, 01:57 AM
  #8  
SNORX302
1st Gear Member
Thread Starter
 
SNORX302's Avatar
 
Join Date: Jan 2005
Location:
Posts: 140
Default RE: p0340 code

any reasoning behind what causes this-I know the s197 guys are having lots of trouble like this after installing udps. But you're the first person ive come across in a square edge with this problem.
SNORX302 is offline  
Old 04-03-2008, 08:57 AM
  #9  
secureintentions
1st Gear Member
 
secureintentions's Avatar
 
Join Date: Oct 2006
Location: Wilkes Barre , PA
Posts: 144
Default RE: p0340 code

Omg.. I have a 2002 GT too and im having the EXACT same problem. Car will not start after u drive it for a bit. It will just start then stall. Also have the same check engine light code po340 and Ive replaced the sensor already. the ford dealer has no idea whats wrong with it. After checking this site im really hoping its just the alternator and that i didnt just buy a lemon... =(
secureintentions is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
BOB ROME
5.0L (1979-1995) Mustang
3
07-26-2023 01:54 PM
mrtrodonet
V6 (1994-2004) Mustangs
3
09-19-2020 03:12 PM
lincolnshibuya
V6 (1994-2004) Mustangs
9
12-08-2015 04:37 PM
Dathan
V6 (1994-2004) Mustangs
4
10-05-2015 05:52 AM
mustangheaven
General Tech
2
09-29-2015 11:00 AM



Quick Reply: p0340 code



All times are GMT -5. The time now is 11:41 PM.