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post #1 of 14 Old 05-29-2011, 03:30 PM Thread Starter
greenweenie
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I need some help you guys

I've been having a slight misfire under acceleration for a while now. I've changed out all the plugs and wires and I've seen no change. I checked all connections and all coils are reading .8 ohms which is right where they're supposed to be.

What am I missing?

1985 W150 318/727.
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post #2 of 14 Old 05-29-2011, 05:35 PM
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Just to be sure, what are the exact symptoms? A misfire should throw a code. Have you cleaned the throttle body?
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post #3 of 14 Old 05-29-2011, 05:40 PM Thread Starter
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I'm sorry, I should have clarified. Under moderate acceleration the truck will start to shake slightly at about 2800-3200rpm. Under light acceleration and heavy acceleration it doesn't do it. It has never triggered a CEL, its very slight. I also notice that when I start the truck and the engine revs right when it starts, it doesn't sound smooth.

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post #4 of 14 Old 05-29-2011, 05:40 PM
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A misfire will present a code identifying what cylinder your misfire is on. Not every misfire is directly related to a spark plug or coil.

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post #5 of 14 Old 05-29-2011, 05:51 PM
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I would do a compression test. If the CEL isn't being set, I would lean towards a valve issue.

New: 2005 Dodge Ram 1500 QCSB 4x4 Hemi Laramie Bright Silver
Flowmaster SI/DO 40 Series. Superchips 3865 - 91 Tune, 2/4 drop, More to come............

::GONE BUT NOT FORGOTTEN::2005 Dodge Ram 1500 QCSB 4x4 Hemi Sport Black
5.5" Rough Country Lift, Dick Cepek DC2 20x9, 325/60R20 Nitto Terra Grappler's, Superchips 3865 - 91 Tune, Extang Tonneau Cover, K&N Cold Air Intake, Bosch Platinum 4 plugs, Magnaflow Y-Pipe, SI/DO Flowmaster Original 40 Series, Synthetic Everything, 7000K Headlights, Foglights and Hellas..

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post #6 of 14 Old 05-29-2011, 05:53 PM
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When a misfire, or bad combustion occurs, the normal combustion process is interrupted, negatively affecting engine performance. So what can interrupt the combustion process? In simple terms, anything that changes a combustion parameter. Now that’s a pretty wide reaching answer, but just think about those things that can adversely affect combustion.

Pre-ignition (the beginning of combustion before the spark plug fires) certainly affects the combustion process. It results from hot spots in the combustion chamber. Also, the build-up of carbon deposits in the combustion chamber can effectively raise the compression ratio. The result is detonation, which is the igniting of the remaining air/fuel mixture ahead of the flame front. While we’re on the subject of things that can affect ignition, a bad spark plug wire (on those vehicles without coil-on-plug ignition) is a common cause of misfires. Also, a clogged fuel injector will limit fuel flow, causing a misfire.

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post #7 of 14 Old 05-29-2011, 06:04 PM Thread Starter
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I forgot to add that when I pulled all the plugs they all looked normal. Also the problem is not consistent, sometimes its pretty bad, other times it's barely noticeable.

I've never really looked at an injector from a 5.7, can they be visually inspected for issues if they're removed?

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post #8 of 14 Old 05-29-2011, 06:12 PM
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You have to flow test an injector. Which means you will hook it up to a piece of equipment and it will measure the volume that the injector puts out.

New: 2005 Dodge Ram 1500 QCSB 4x4 Hemi Laramie Bright Silver
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::GONE BUT NOT FORGOTTEN::2005 Dodge Ram 1500 QCSB 4x4 Hemi Sport Black
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1998 Dodge Durango SLT 4x4 Black
Hypertech 87 Tune, K&N Cold Air Intake, Bosch Platinum 4 plugs, Bosch 8.5mm Wires. Ported Throttle Body, SI/DO Flowmaster Original 40 Series Muffler, Headman Headers, 3" PA BL, 2" T/S Lift, 33x12.50R15 Firestone Destination M/T's, 15x8 Eagle Alloy Wheels.

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post #9 of 14 Old 05-29-2011, 08:42 PM
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Hate to say it but sounds like a broken valve spring. A broken spring shows the same symptoms. Pull the valve cover on the side of the motor showing the misfire and give er a peek

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post #10 of 14 Old 05-30-2011, 01:24 AM
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he's not throwin a misfire code..like advised earlier, have you cleaned out the throttle body (pull it out and clean both sides.)...

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best 1/4 (5.7 nitrous): 12.10 @ 113
best 1/4 (5.7 na): 12.96 @ 104 (cold day)
best 1/4 (6.4 na): 12.54 @ 107 (hot day)
over 300k miles on block
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post #11 of 14 Old 05-30-2011, 06:19 AM
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A broke valve spring wouldn't throw a code either. There is no electrical connector for one, so there is no reading sent back to the PCM to trigger a code. It does sound like your best bet is to pull the valve covers, both sides, and check em out. Any spark related issue will trip a CEL.

New: 2005 Dodge Ram 1500 QCSB 4x4 Hemi Laramie Bright Silver
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::GONE BUT NOT FORGOTTEN::2005 Dodge Ram 1500 QCSB 4x4 Hemi Sport Black
5.5" Rough Country Lift, Dick Cepek DC2 20x9, 325/60R20 Nitto Terra Grappler's, Superchips 3865 - 91 Tune, Extang Tonneau Cover, K&N Cold Air Intake, Bosch Platinum 4 plugs, Magnaflow Y-Pipe, SI/DO Flowmaster Original 40 Series, Synthetic Everything, 7000K Headlights, Foglights and Hellas..

1998 Dodge Durango SLT 4x4 Black
Hypertech 87 Tune, K&N Cold Air Intake, Bosch Platinum 4 plugs, Bosch 8.5mm Wires. Ported Throttle Body, SI/DO Flowmaster Original 40 Series Muffler, Headman Headers, 3" PA BL, 2" T/S Lift, 33x12.50R15 Firestone Destination M/T's, 15x8 Eagle Alloy Wheels.

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post #12 of 14 Old 05-30-2011, 08:35 AM Thread Starter
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I cleaned out the throttle body about 6 months ago, I haven't cleaned it since. I'll pull it and clean it and see if that's helps. If that doesn't fix it, I'll start pulling valve covers. If at that point I do not find a broken spring I guess I would have to expect a bad valve? Is there any way to diagnose a bad valve before pulling the heads? I'd hate to pull the heads and find nothing wrong.

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post #13 of 14 Old 05-30-2011, 11:03 AM
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a broken valve spring should be felt at all rpm's... but wouldn't hurt to checkem to rule it out..

05 Ram 1500 QC 5.7 (stroked 6.4 as of 7/14)
Inertia Motorsports Stroker Assy/Custom Tuned
best 1/4 (5.7 nitrous): 12.10 @ 113
best 1/4 (5.7 na): 12.96 @ 104 (cold day)
best 1/4 (6.4 na): 12.54 @ 107 (hot day)
over 300k miles on block
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post #14 of 14 Old 05-30-2011, 12:21 PM Thread Starter
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Would a compression test tell me if I have a burned valve or broken spring?

1985 W150 318/727.
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