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Slight surge with cruise and low rpm

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Slight surge with cruise and low rpm

Postby ckoehler21 [OP] » May 26 2021, 7:13pm

Hi All,

I recently installed a Diablo Sport I3 Platinum on my 2011 Silverado 5.3L with CAI. I have the gas mileage booster tune installed.

This happened during a single drive, I have not had it out since but I am continually mulling it over.

Driving at 70mph down the highway at about 1800-1900 rpms. The truck feels like it's skipping a beat? the RPMs jump up 300-400 RPMs for not even half a second, like it's going to downshift but then it just drops back to where it was. Experience this 7-8 times in a 20 mile trip. Drop a buddy off, engine stays running, cruising through town back home. Same thing happened at 35-40 mph without cruise.

Does anyone have any ideas on this?
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Re: Slight surge with cruise and low rpm

Postby 00pooterSS » May 26 2021, 8:21pm

Possibly converter shudder. Hard to say. Remove the tune and see if it continues.
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Re: Slight surge with cruise and low rpm

Postby GBSierraSLE » May 26 2021, 9:01pm

Check your CAI for loose connections/clamps. It can be a source of vacuum leaks.

Better yet, put the stock air box back on. The CAI really doesn't do anything for you (except noise). The truck came with a CAI from the factory.
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Re: Slight surge with cruise and low rpm

Postby ckoehler21 [OP] » May 26 2021, 9:07pm

Thanks for the advice, when I bought the truck it had the CAI on it. I can't go back unless I go looking for one. It seems that I need to look for vacuum leaks around that intake. I'll start there. Thanks again.
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Re: Slight surge with cruise and low rpm

Postby Chevy-SS » May 26 2021, 9:33pm

Is your CAI the type with oiled filter? If so, then I would strongly suggest a thorough cleaning of the MAF with appropriate cleaner. There may be a tiny film of oil from the CAI filter (if equipped with oiled filter) getting deposited onto the MAF, and that will make the engine run oddly.

As suggested, I would ditch the CAI anyway. Go to local junkyard and buy used OEM setup. That's what I did. It cost me $50.
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Re: Slight surge with cruise and low rpm

Postby 06MonteSS » May 26 2021, 9:58pm

sounds like the AFM/DOD kicking on and off... the MPG Booster tune modifies the AFM/DOD settings to have it go into 4 cyl mode more and to stay in it longer... so you're right around the areas for it to be kicking on and off... I would just disable the AFM/DOD setting, since it doesn't really gain you much anyway... Or install the regular 87 Octane Tune...
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Re: Slight surge with cruise and low rpm

Postby ckoehler21 [OP] » Jun 02 2021, 7:17pm

Thanks for all the help guys.

I put on about 250 miles this weekend. The only thing I did was reinstall the MPG Booster tune. Before I did, I took a look at the settings for the tune that was in there. The only thing that stood out was that there was a * by the Torque Management option. It was still on but there was a star by it. I dropped in the MPG booster tune without clicking the settings to be sure nothing was changed. I had no issues at all.

I still plan to clean the MAF and take a look under the hood, but for now I think my problems are gone. Thanks again
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Re: Slight surge with cruise and low rpm

Postby 00pooterSS » Jun 02 2021, 8:28pm

GBSierraSLE wrote:Check your CAI for loose connections/clamps. It can be a source of vacuum leaks.

Better yet, put the stock air box back on. The CAI really doesn't do anything for you (except noise). The truck came with a CAI from the factory.



Countless dyno tests have shown power gains. The factory air intake is cold air, but also restrictive to flow.
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Re: Slight surge with cruise and low rpm

Postby GBSierraSLE » Jun 02 2021, 8:53pm

A few hp at 6,000 rpm? How much time do you spend at WOT? You won't notice any gain in 99.9% of every day driving. Looks cool, sounds good, but not worth the $$. If you are towing heavy and spending a lot of time in the upper rpm ranges, maybe.
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Re: Slight surge with cruise and low rpm

Postby Chevy-SS » Jun 02 2021, 9:11pm

00pooterSS wrote:Countless dyno tests have shown power gains. The factory air intake is cold air, but also restrictive to flow.


Got any links to show these gains on a stock Chevy truck? Maybe at highest rpm range, but even then I am guessing the gains are negligible, not worth the cost and hassle.

And then if you're using an oiled filter, you're gonna contaminate the MAF.
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