Mechanics

IDLING ROUGH MISFIRING LOW REVS HIGH REVS FI

2003 Dodge Ram

Engine Mechanical problem
2003 Dodge Ram V8 Two Wheel Drive Automatic 51000 miles

I have a dodge ram hemi 1500 quad cab which ran fine until a particular cold spell which may be coincidence but it was out of action for a week due to snow, pipes were frozen so defrosted with hot water, it did have antifreeze in it but not enough as it was our bad freeze we had in dec/jan afterwhich the car ran fine for a couple of weeks then started to run rough for a few weeks then ran really rough within a matter of days and I was unable to go anywhere, struggling idleing. Had plugs and leads replaced and diagnostics test at dodge of which they said it had low compression on piston 2, but seemed unconfident with this. A friend who is a mechanic said he thought it had various misfires and wasnt happy with the diagnosis, sadly he hasnt the time or tools to do the job. Started it again today and its making a strange squealing noise when I steer like its struggling for power, a sort of pinking noise, it runs fine when you put your foot down, its making a popping noise otherwise, on low revs, and eventually stalls, I am unable to use the vehicle
im at my wits end as no one seems to be able to tell me whats the matter and dodge have said they want 1250 plus vat to replace the exhaust valve but wont guarantee this is the problem, I desperately need advice before I get stung. Any tips
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Bumacid
March 23, 2010.




Start basic and do a compression test on the entire engine, this will take the guess work out of which cylinder it is or if you have a compression issue. Also, when was the oil changed last and what weight oil was used? Those engine have variable displacement systems that are very sensitive to the weight of oil used in them, especially if the temps are getting that low. Has the PCM been scanned for trouble codes? If so exactly what codes were in it?

Tiny
Jack42
Mar 25, 2010.
Done the compression test it shows piston 2 down, but test on engine diagnotics, the one where it comes on dash says code po351 2 and 3 which Ive found out are coils a, b and c,
oil and plugs were changed around 8 months ago not sure which type but I know it was same as always used, I am going to try and swap a coil around today to see if the diagnostic tool picks up the same thing then try and replace the coils Im no mechanic and am working on mostly what ive learnt here and net, both dodge and my mechanic cannot say whats the matterbut said I may have to spend 1000's
any more tips

Tiny
Bumacid
Mar 25, 2010.
Moving the coils around is a good idea, but if it is low on compression it wont make any difference.I would try pulling the valve cover for #2 and see if the valvetrain is working properly.
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Tiny
Jack42
Mar 25, 2010.

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