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  #1  
Old 08-01-2010, 10:13 AM
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Default '97 5.9 misfire

My 97 Ram 1500 with the 5.9 and automatic started missing yesterday.
I was heading to town, about 30 mile trip, at my usual 60-70 mph... and noticed at first it was 'bucking' a little. When I came up to the first stop sign, it sounded fine. But when I accelerated away from I could hear the miss. When I 'pushed it' to maintain 60+ mph, it does it. When I push the OD switch off, and the motor doesn't have to torque as hard, it seemed better. But as soon as I roll back onto the gas, starts missing again. About 10 miles from town, finally popped a check engine code. I shut it down, and restarted it several times. It starts right off, just like always. At first I thought my coil was going away, my '95 did this a couple years ago. But it took forever to start with the bad coil.
The other thing I noticed is Idle, while not missing, is all over the place in rpm. typically 1000-1200. usually it's about 650-700. I am not sure if when the check engine light is on, the computer is telling engine to 'run home to momma', and idle is affected, or whether there is a bad sensor.
I don't have a code reader, any suggestions on what I need to buy?
I would like one that could do both my 95, and this 96. (OBD l and ll).
The speedometer works fine, I know when my speed sensor went bad in my '95 I had very similar symtoms in that truck. (missing and bucking). I will snag a code reader tomorrow, but for now any thing sound familar?
Thanks a ton guys!
Bob
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  #2  
Old 08-01-2010, 10:24 AM
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Yeah, sounds like you could have a blown intake plenum pan gasket which is causing an internal vacuum leak and your misfire. Of course it could still just be a good old fashioned misfire caused by a bad plug, wire, carbon track or something along those lines. You could always give the key dance a go and pull your codes that way for now.
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Old 08-01-2010, 01:40 PM
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Default key dance?

It's been awhile, but you mentioned the key dance... I remember doing that on my '87 dakota.... was it 3 on-off cycles in quick succession? and then 'try' to count the flashing 'morse code' ? After I do this, is there a code decipher somewhere in here? Thanks Remerson.
Bob
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Old 08-01-2010, 02:42 PM
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That's the same trick. Post the codes or Google them and you'll get definitions.
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Old 08-01-2010, 03:20 PM
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Default code results

ok, my kid came home with the truck just now, and said it's running better. So I just took off with it and pounded on it pretty hard, and sure enough, runs very well. I did the key dance and got this:

3 flashes, pause, 5 flashes, pause, 5 flashes.

I think if it's a bad plug or wire, or dist cap... it would be there (the miss) continually.

which makes me think it's a plenum gasket too.
So happens I got an extra gasket set laying around, tonight after it cools off... will donate about 3 hours time!
Wish me luck!
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Old 08-01-2010, 03:29 PM
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If you haven't done the cap, rotor and wires lately, this is the time.
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Old 08-01-2010, 03:30 PM
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Default

ok, I found a site with the codes....and see that my first set of flashes needs to be a 2 digit number. so I either have a 1-2 or 2-1 flash before the 5 and 5.

if it's 1-2, I DID have the battery disconnected yesterday.
If it's 2-1, It's the O2 sensor staying centered. But that would be continually lit when engine is running. unless it was just a momentary condition yesterday??
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Old 08-01-2010, 03:34 PM
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rancherman rancherman is offline
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Default tune up time

Quote:
Originally Posted by Remerson228 View Post
If you haven't done the cap, rotor and wires lately, this is the time.
No doubt! No better opportunity to get at the dist whilst the intake is off!
later!
Bob
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  #9  
Old 08-01-2010, 04:06 PM
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I'd say you had a 1-2 most likely.
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  #10  
Old 08-01-2010, 07:58 PM
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Default nother code!

I was driving the truck over to the shop to work on it tonight.... and it popped a new code. this time it flashes 2 different ones. first one is the 1-2: (battery disconnected within last 50 starts)43**Ignition coil circuit #Open or short in number # coil circuit. Indicates that the ignition coil's peak primary circuit current is not achieved with the maximum dwell time.
Does this mean my coil is starting to go? I am going to go ahead with the intake gaskets, plugs and wires and cap and rotor. might as well tune it all the way!
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