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  #1  
Old 02-05-2011, 04:01 PM
mopar schmaltz mopar schmaltz is offline
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Question Rough running V10

Help!.....starting to run out of things to check ......thoughts?....suggestions?

’97 Dodge Ram, 2500, 4x4, V10, Manual, 165k miles, one owner


Symptoms:
Runs slightly rough; started 1000 miles ago
Any engine speed
Any ground speed (including parked)
Any gear
More noticeable at low RPM
Feels like a cylinder is half firing; not as rough as loosing cylinder
Engine does not backfire
Doesn’t feel down on power
Engine uses anitfreeze since ~140k miles (rate: 1 g/10k miles)……no leaks seen

Replaced below components one at a time:
Plugs; NGK V-Power, 0.045”
- Removed Plugs have no unusual wear (only had 10k miles)
- Perfect light tan on insulator
- No fowling or cracked insulators
Wires, Mopar; installed as per TSB 18-16-98 (7/5) crosstalk issue

Troubleshooting:
No Check Engine light
No Codes logged in OBD2
Checked city fuel mileage
- Currently: 10.3 m/g
- 9k miles ago: 10.5 m/g
- 30k miles ago: 10.9 m/g
Compression check
- Dry: 155 – 170
- Wet: 160 – 180
- Biggest delta between any two adjacent cylinders is 10psi
Ran a bottle of injector cleaner thru system via fuel tank; no effect
Pulled (1) plug wire at a time; runs significantly rougher when any one plug wire is pulled
Checked motor mounts; in good shape
Removed Fan & Clutch; no effect
Checked Harmonic Balancer; in good shape
Checked Pulley Crank bolt torque: good
Ran engine without accessory belt; no effect
Checked fuel rail pressure: 47psi…..within spec
Sprayed Ether around all vacuum hoses at idle; no idle change
Took truck to Dealer; couldn't find problem
- All sensors are within tolerance
- They performed Throttle body/upper intake cleaning; no effect
- They put injector cleaner in tank; no effect

Next Steps:
Check vacuum with guage
Hook up OBD2 Diagnostic logger
Replace Injectors
Pull heads
Replace cam

Last edited by mopar schmaltz; 02-05-2011 at 04:07 PM.
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Old 02-05-2011, 04:50 PM
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I would suggest you check your EGR valve.
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Old 02-05-2011, 05:29 PM
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Have you done a leak test to see if it could be a head gasket sense your loosing antifreeze. EGR valve could be messing up.
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Old 02-06-2011, 10:25 PM
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Thanks for the quick replies.....

Dodge V10 doesn't have an EGR Valve
I haven't done a Leak Down Test; I'll pickup a guage and test.

I haven't had a head gasket come apart on coolant side before; don't you get bubbles at anti-freeze cap?

I did drop the oil nothing unusual from pan (no foam = no anti freeze) but I opened the Filter up and it's oil had a slight metalic look to it. I've seen much worse but I'm planning on opening up my other vehicle's filter and compare.
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Old 02-08-2011, 09:59 PM
mopar schmaltz mopar schmaltz is offline
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Default Still troubleshooting.....

I opened up the oil filter and captured the intake side oil on my truck and my 40k mile Mazda. I closely compared the two under bright light and magnification. I would say the Truck oil overall has 50% more particulate then the Mazda. Under bright light you can see a little shimmer in the oil; where as the Maxda oil you can barely detect a shimmer.

I've opend up other filters because I suspected (and there was) engine damage; the oil in those cases looked more like metalic paint than oil.

I would clasify as being healthy.....
I'm still working to get a hold of a Leak Down Tester.....

Thoughts?
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Old 02-17-2011, 12:09 AM
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Sent out oil for analysis; they’ll categorize oil health, identify amounts of foreign compounds (coolant) and particulate concentration to include composition.

Checked Crankshaft Thrust clearance: 0.004”; spec is 0.003" - 0.012"

Started Lead Down Test
#1: 2%
#2: 1%
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Old 02-25-2011, 12:45 AM
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Finished Leak-down Test:
Warm engine
Measurements at TDC
Pressure 90 psi
Lead-down % between 1 & 2; I beleive these numbers are all artificially high but because they are consistant cyl to cyl it's reasonable to assume there isn't a significant problem w/rings or valve seats

No significant difference in: tail pipe, intake and oil fill noise during test
No bubbles at radiator cap

I did not find a meaningfull correlation between a cylinder w/lower compression and a cylinder with lower leak-down.
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