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  #1  
Old 06-27-2013, 09:09 AM
Breeze13 Breeze13 is offline
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Default Hi speed miss?

I have a 98 1500 4wd. When running at a steady speed it seems to miss out. Almost like the fuel flow is interrupted. When I accelerate it really goes, but at a steady speed it drops out for a split second. I can't really hear anything, I just feel it in my gut. Can't hear any cough or backfire. It's just there then it's not. I put a new fuel pump on about 9 months ago so I don't think that's the problem. It's a plastic tank so I don't think there would be rust in there. My wife drives it occasionally and she said it had died on her a couple of times at low speeds but starts up again within a few minutes. I had this problem before after I first bought the truck 4 years ago and a new cam sensor fixed it. Before when the cam sensor went bad it ran great until it just suddenly died. Didn't miss at all. I'm not sure what's going on. Any suggestions would be helpful. A mechanic friend said he thought it would be the PCM but there's gotta be something cheaper to try before I go for the big $350 part. Thanks, Breeze13
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Old 06-28-2013, 11:20 AM
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ninjalogic ninjalogic is offline
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Quote:
Originally Posted by Breeze13 View Post
I have a 98 1500 4wd. When running at a steady speed it seems to miss out. Almost like the fuel flow is interrupted. When I accelerate it really goes, but at a steady speed it drops out for a split second. I can't really hear anything, I just feel it in my gut. Can't hear any cough or backfire. It's just there then it's not. I put a new fuel pump on about 9 months ago so I don't think that's the problem. It's a plastic tank so I don't think there would be rust in there. My wife drives it occasionally and she said it had died on her a couple of times at low speeds but starts up again within a few minutes. I had this problem before after I first bought the truck 4 years ago and a new cam sensor fixed it. Before when the cam sensor went bad it ran great until it just suddenly died. Didn't miss at all. I'm not sure what's going on. Any suggestions would be helpful. A mechanic friend said he thought it would be the PCM but there's gotta be something cheaper to try before I go for the big $350 part. Thanks, Breeze13
Possibly The Camshaft Position Sensor (AKA Distributor Ignition Pickup) going bad again or Crankshaft Position Sensor going out but I'm leaning more towards the Crankshaft Position Sensor

Last edited by ninjalogic; 06-28-2013 at 11:22 AM.
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Old 06-28-2013, 03:35 PM
Breeze13 Breeze13 is offline
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Default Thanks for the Reply

Is there some way to test either the Crankshaft position or camshaft position sensors?
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Old 06-28-2013, 04:25 PM
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ninjalogic ninjalogic is offline
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Originally Posted by Breeze13 View Post
Is there some way to test either the Crankshaft position or camshaft position sensors?
unfortunately the only way i know of is with a scope and only mechanics have those, you can take it to a shop and have them look at it, personally I would just take it to the dealership, nothing more expensive than chasing a ghost in the system

check out this video

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Old 06-29-2013, 09:47 AM
Breeze13 Breeze13 is offline
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Default Thanks NinjaLogic

Thanks for the info and the informative video clip. I can see how this could turn into a parts changing nightmare. I'll try to get it to the dealership and see what they say. Thanks again, Breeze13
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Old 06-29-2013, 10:54 AM
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ninjalogic ninjalogic is offline
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Believe me I had to learn the hard way I just kept changing parts spent almost 1000 in parts trying to get a ghost out of the system it came down to the valves weren't seating correctly on the head
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