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  #1  
Old March 11th, 2010, 07:44 AM
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Rich Campbell
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running rough

My 97 seems to be running rough more noticeable at about 1600rmps. Not bad at idle. Seems more just as i start to move. (5-20mph)Higher speeds seem ok.

Engine has 130k. New air filter, checked plug wires, cleaned pvc.

Any ideas......tried a gas additive to clean lifters but it did nothing. THinking about changing the oil to Ron's advice 0w 40syn.

Anyone have any thoughts on this.

Thanks
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  #2  
Old March 11th, 2010, 10:49 AM
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I doubt oil would cause rough running.
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Old March 11th, 2010, 10:56 AM
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rough

I agree. I'm thinking of doing the whole seafoam flush and then switch over to 0w40. See if it improves things.

Sludge maybe?
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  #4  
Old March 11th, 2010, 11:01 AM
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97 I would say sticking valves. Has it ever had a valve job?
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  #5  
Old March 11th, 2010, 01:16 PM
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Rough

Did the seafoam....changed oil to 5w30syn and put in a Lucas stabalizer..no better.
Can you adjust valves in a 97?

It's not a major problem just running rough at 1500.
Maybe I should put new plugs in it and see if that helps.
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  #6  
Old March 11th, 2010, 01:37 PM
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Yes, do the easy stuff. It is not valve adjustment, it is that the valves get caked in carbon and stick a bit. Extraordinarily common on GEMS discos which have the same motor.
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Old March 11th, 2010, 03:41 PM
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Thanks...did the plugs.. No better. Did the seafoam in the PVC 1/3 in oil 1/3 in gas.

The lucas stabalizer with the syn 5/30 did seem to quite the engine down a bit. Still rough at 1500 though.
I assume you shouldnt use valve cleaner too
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Old March 11th, 2010, 03:51 PM
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I dunno. When you swing by I will look at it and we can scratch out heads. Did you try evilfij's famous unplug things until it gets better or dies test?

I would start with the MAF.
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Old March 11th, 2010, 05:44 PM
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Test

I haven't tried that test!! Maybe it is because I don't do 100mph on 95 like u do. That should blow out the sludge!
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  #10  
Old March 11th, 2010, 06:04 PM
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Just go drive the truck hard... These trucks like to be driven hard...not puttering around the block.
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  #11  
Old March 11th, 2010, 07:25 PM
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I think you may be right!
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  #12  
Old March 11th, 2010, 07:28 PM
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Quote:
Originally Posted by Campbell View Post
I haven't tried that test!! Maybe it is because I don't do 100mph on 95 like u do. That should blow out the sludge!
That is actually quite true. At the dealer, the soccer moms who drove up and Rt. 30 needed valve jobs. The guys whose other car was a ferrari never needed them.

Italian tune up is what we called it.
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Old March 11th, 2010, 07:34 PM
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I'll give it try starting tomorrow
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  #14  
Old March 13th, 2010, 09:42 AM
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I did that 5w30 and the lucas snake oil. 0w40 or the 10w40 high mileage from Mobil. Take that truck out and flog it Have you done the plug wires?
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  #15  
Old March 13th, 2010, 09:50 AM
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So the lucas didn't help? The oil change didn't help?

I just did the plugs but not the wires yet.


Thanks
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  #16  
Old March 13th, 2010, 04:36 PM
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i cant edit, Id DITCH the 5w30 and the Lucas. Ive been using the 10w40 hi mileage in my 90 for 7 years, its good stuff.
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  #17  
Old March 13th, 2010, 06:10 PM
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Thanks for the advice...next change maybe will give the 10/40 a try.
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  #18  
Old March 13th, 2010, 08:49 PM
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How old are the plug wires? Might not be a bad idea. And splurge on GOOD ones, not generic auto-parts stuff. I've had nothing but problems with cheapie wires burning up on me. Problem-free (at least the wires) since I put in a set of Mallory.

-Hans
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  #19  
Old March 14th, 2010, 03:05 PM
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I will try the wires...where's a good place to get them?
Thanks
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  #20  
Old March 14th, 2010, 04:02 PM
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summit racing has some listing for the 3.5 buick. Next time around I am going to get the cut to fit kit they have available.
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