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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 1994 - 1995 Specific Tech

98 V6 sputtering/missing

  • Thread starter Thread starter ronstang94
  • Start date Start date Sep 27, 2009

ronstang94

Member
May 10, 2007
204
1
18
Phx, AZ
Sep 27, 2009
#1
  • Sep 27, 2009
  • #1
Its my sisters car and I posted up in the V6 forums, but it got 30 reads but no replys, and I know you guys are a ton of help and some of you have V6s as your DD, so I figured I would try here.

The car sputters and misses, has a cam sensor code and a misfire detected code, p0340 and p0300.

ran some electrical tests on the sensor and it was bad. Took it out and found that it had destroyed itself, nothing but metal and plastic bits. I have no clue how the engine was still running. The syncronizer (basically the distributer shaft) was also damaged. so I replaced the entire setup. I couldnt find the alignment tool anywhere (tool to get the timing just right). so I aligned everything to the marks I had made, left the (distributer) hold down loose so I could do a little dizzy twisting to get it just right.

So I fixed one obvious problem but the engine still sputters, almost as bad as before. What now?

Thank you.
 

earleys94gt

Active Member
Aug 31, 2003
1,223
16
49
Ashley, Ohio
Sep 27, 2009
#2
  • Sep 27, 2009
  • #2
p0340 and p0300
Click to expand...
Did you find out what these codes went to?
 

Chythar

Recently finished repairing my rear
20+ Year Stangneter
Aug 26, 2004
2,373
140
113
Foothill Ranch, CA
Sep 28, 2009
#3
  • Sep 28, 2009
  • #3
The V6 forums are useless for tech help, most of them are more concerned with exhaust and rims rather than helping other folks.

Never dealt with that problem on my 94 V6 (it's a Cobra clone now). Did you clear the codes in the computer? You should reset the computer afterward as well. The PCM tries to adapt to what its sensors tell it; since you have changed a sensor, it's best to let it start from scratch. Disconnect both the positive and negative battery terminals and leave it for 15 minutes or so. Then reconnect the terminals and see if the engine runs any better.

You could have fouled spark plug(s) depending on how long the cam sensor was bad. I would recommend changing the spark plugs; make sure you gap them at .054". New spark plugs should change how the engine runs, but may not fix the problem entirely.

Report back with your results and we'll go from there.
 

Adam95GT

New Member
Aug 14, 2006
2,564
3
0
Burlington, NJ
Sep 28, 2009
#4
  • Sep 28, 2009
  • #4
ronstang94 said:
Its my sisters car and I posted up in the V6 forums, but it got 30 reads but no replys, and I know you guys are a ton of help and some of you have V6s as your DD, so I figured I would try here.

The car sputters and misses, has a cam sensor code and a misfire detected code, p0340 and p0300.

ran some electrical tests on the sensor and it was bad. Took it out and found that it had destroyed itself, nothing but metal and plastic bits. I have no clue how the engine was still running. The syncronizer (basically the distributer shaft) was also damaged. so I replaced the entire setup. I couldnt find the alignment tool anywhere (tool to get the timing just right). so I aligned everything to the marks I had made, left the (distributer) hold down loose so I could do a little dizzy twisting to get it just right.

So I fixed one obvious problem but the engine still sputters, almost as bad as before. What now?

Thank you.
Click to expand...


Sounds like the car may still be out of timing. also as others said... reset the codes b4 you do anything.
 

ronstang94

Member
May 10, 2007
204
1
18
Phx, AZ
Sep 28, 2009
#5
  • Sep 28, 2009
  • #5
See this is the kind of help im talking about! :SNSign:

I had the negative off and the check engine light hasnt came back yet. didnt know the possitive should come off too, so Ill do that and Ill do the plugs and wires just incase but I dont think it will help. Its running so bad and the way that it drops cylinders is completely random. I dont think the engine is even making a full rotation without a misfire.

Ill post up after I get some more work done. Dont know how long it will be though, school is rough.

Thank you
 

Chythar

Recently finished repairing my rear
20+ Year Stangneter
Aug 26, 2004
2,373
140
113
Foothill Ranch, CA
Sep 28, 2009
#6
  • Sep 28, 2009
  • #6
If you don't want to put $$$$ into it, just pull the plugs and check them. See if they look fouled or the gap is messed up.
 

xr8d302

I bought a 27" monitor to compensate for my lack o
Apr 29, 2004
1,113
0
36
Medicine Hat, AB
Sep 28, 2009
#7
  • Sep 28, 2009
  • #7
As well, and I'm sure you've done this, give the plug wires a thorough check for burns. That was a problem for me for a while, small burn through the wire coating caused a wack of issues

Dizzy could still be out, but as everyone else said, have the computer reset before you attempt the deeper stuff
 

Chythar

Recently finished repairing my rear
20+ Year Stangneter
Aug 26, 2004
2,373
140
113
Foothill Ranch, CA
Sep 28, 2009
#8
  • Sep 28, 2009
  • #8
xr8d302 said:
As well, and I'm sure you've done this, give the plug wires a thorough check for burns. That was a problem for me for a while, small burn through the wire coating caused a wack of issues
Click to expand...

Excellent idea, I was going to suggest the plug wires next. A nice way to test if your plug wires are worn out is to take a spray bottle and spray a mist of water around the plug wires whil the engine is running. Do this at night and pull the bulb for the underhood light. If the wires are worn out you'll see some electrical arching. The water mist increases the electrical conductivity temporarily, letting you see the electrical leakage. Without the water, the arching is still happening but not enough for you to see. New wires will not arc like that.

New plug wires are in order if you see any arching at all.
 
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