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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 06-23-2012, 07:09 PM
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Exclamation Irregular RPMs Help

Hey community...I got a slight issue im dealing with and im not sure what the problem is or what I can do to fix the issue. Pretty much what is happening is when I accelerate, the RPM's which normally rise steadily and consistently no longer do that all the time. When I apply steady constant pressure and im accelerating, usually in the lower RPM range, the RPMs tend to jump up and down by about 100-200 as it increases. Kinda feels like it is hesitating then surging by a small amount when I accelerate. I can post a video of it later if someone would like to "see" what im refering to.

I've searched the forums to the best of my ability and can't find anything on this. The only thing ive changed to my truck is I recently changed 12/16 spark plugs(waiting for a friend to help me with the back 4) and this is what im thinking is the issue. Maybe I didn't install them correctly?

Anyone have an idea? Thanks.
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Old 06-23-2012, 08:24 PM
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Could it be a bad o2 sensor? Have you done any mod's? After rereading your post, I think I read somewhere where someone had the same type of problem and they spent A LOT of money at the dealership to find out that he had replaced the manufacturers plugs with a different set of new brand name plugs and it did something to the computer that kept causing trouble. The end result was that the dealership replaced the new plugs he put in with NEW manufacturers plugs and everything ran fine after. Did you use the same type of plugs?
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Old 06-23-2012, 11:58 PM
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Yeah oem plugs. Only mods i have are a volant cai and flowmaster exhaust. The old spark plugs were worn down pretty good do you think the 4 i left in are messing with it?
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Old 06-24-2012, 08:56 PM
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I feel that if the plugs were causing that much of a problem they would throw a check engine light or something. Who knows, maybe it is the plugs just causing that variation in rpms
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Old 06-24-2012, 10:03 PM
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Quote:
Originally Posted by ddeloria View Post
Yeah oem plugs. Only mods i have are a volant cai and flowmaster exhaust. The old spark plugs were worn down pretty good do you think the 4 i left in are messing with it?
Well, I don't think it is advisable to run 4 new plugs with 4 old ones, especially for any length of time. I wouldn't if I were you, but I am no expert on the subject... It still could be the 4 old ones causing you trouble. I would replace them really soon and see if that fixes your problem. If it persists then you will know it wasn't the plugs and can go from there. Good luck tho.

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Originally Posted by 1500Ram9987 View Post
I feel that if the plugs were causing that much of a problem they would throw a check engine light or something. Who knows, maybe it is the plugs just causing that variation in rpms
Yah, I thought it would throw the check engine light as well and it may very well have, but I don't remember reading it. I just hope it doesn't cost ddeloria as much as it cost the other person!!!
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Old 06-25-2012, 04:49 PM
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Ok I think I found the problem. I had recently changed from a 91 SC tune to a 87 and I think my engine was getting used to the fuel change. I read somewhere that the computer gets used to your fuel and changes stuff based on what you use, but I think it finally adjusted itself to the 87. It's been about 100 miles or so since I did it and the last 2 days I havent noticed my RPMs jumping up and down like they used to.

Thanks for the help though anyways guys.
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Old 06-25-2012, 05:01 PM
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glad to hear that..I was gona suggest cleaning tb and replacing air filter to be sure... I've done it before where if I wanted a quick plug change, I would only do the 8 primaries and then the exhaust stroke ones on every other plug change..
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