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V10 Mis-fire question

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Old 07-14-2012, 08:57 PM
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Default V10 Mis-fire question

I have a 2000 Ram V10 that has a chronic misfire in #10.

A few months ago she threw rocker bolt #8. I replaced the bolt and
swapped in new rod bearings at the same time. Truck ran fine for about a
week then developed an intermittent miss on #10. I did a complete tune-
up, swapped another spark plug and wire, replaced the coil, cleaned the
fuel line and replaced the injector, and compression checked the cylinder
(130#.) None of these things had any effect on the miss no offered any
suggestions as to the problem.

The misfire is very, very erratic - my first thought is a sensor/ecu issue??

My daily driver has broken down so now a mild weekend annoyance has
become a serious issue that need attention. I am hoping someone here
has encountered this issue - any suggestions or observations?
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Last edited by Bonkers; 07-14-2012 at 08:59 PM..
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Old 07-14-2012, 09:11 PM
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Is it JUST cylinder 10? What did compression look like on the other cylinders?
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Old 07-14-2012, 10:38 PM
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Compression numbers (as done by shop
#02 130psi
#04 135psi
#06 130psi
#08 125psi
#10 130psi

They seem low to me, but according to computer these are all within
spec. The mechanic wanted to tear apart the motor to find miss, but
that would have been $$$ that I don't have to spare right now.

When I pull the wire off of #10 the misfire smooths completely out to what
you would expect on a bad cylinder. I am as amatuer as it comes to
dealing with motors so I don't know what else I can do to determine if
another cylinder is missing as well. I am fairly confident at this point that
its just the one cylinder misfiring, and that it's misfiring randomly about
10% of the time.
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Old 07-15-2012, 09:02 AM
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As far as dodge is concerned, anything over 100 PSI is acceptable, so long as all cylinders are within 25% (or so) of each other. Your numbers look pretty consistent, and not to bad for a high mileage motor.

Are you getting misfire codes? I would take a look at the cylinder that is paired with number 10 on the coil, and see if that one is misfiring as well. Were you able to replace just the individual coil, are did you have to replace all coils, and the module on that set? (I think you have coils that are actually separate from the modules on a 2000?)

One thing I don't see mentioned, is checking connections at the PCM side of things. It hangs out under the hood, on the passenger side firewall... Might wanna pull the plugs there, and check/clean them.
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Old 07-15-2012, 09:02 AM
 
 
 
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