engine question - tachometer

[sharvinnp]

Hi all, I have a '19 5.0 GT with about 75K miles. The tachometer bounces when going uphill on a road. Anyone have any experience on this or ideas what could be causing this?

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[NeedForGreen]

First thing I would check are the spark plugs. Most likely a misfire on one of them. I had a bad plug on cyld 3 that was very similar and had no codes.

 

[EFI]

Also check the MAF, intake, and any EVAP connections around the intake and manifold.

 

[Gfswindle]

Intake phasers is my vote. I have the same issue.

 

[Strokerswild]

Phasers or solenoids.

 

[Ransom]

I bought my 18 GT from California and had it shipped to me. After it was unloaded off the truck, i noticed the idle wasnt very smooth, would almost stall. I found whoever did the inspection on it, didnt properly secure the airbox lid, once i put the lid on properly, idle was perfect.

 

[Stanv03]

Hi all, I have a '19 5.0 GT with about 75K miles that is idling rough. I was able to catch it on video as it happened and uploaded it to this YouTube video here. The car shakes when it drops below 500 rpm but still no CEL. Anyone have any experience on this or ideas what could be causing this and would this be an expensive fix at the dealer? Thanks!

I have a 2020 Gt with 38K miles and I’m having the same problem, I’ve noticed that it only happens when I put it into sports plus and take it on the highway. I don’t know how to fix it :(. I literally just made a post myself about this same topic a few mins ago to maybe try to find some help.

 

[Brochacho620]

I have the exact same issue. (2018 GT 10Speed, LTH & catless mids, P51 Intake and tuned on E85) 65k miles
After constants logs with Lund they narrowed it down to VCT Solenoids and or Cam Phasers.
Apparently it’s not rare on our cars..

 

[Torinate]

I have the exact same issue. (2018 GT 10Speed, LTH & catless mids, P51 Intake and tuned on E85) 65k miles
After constants logs with Lund they narrowed it down to VCT Solenoids and or Cam Phasers.
Apparently it’s not rare on our cars..

What’s the difference between VCT solenoids and the Cam Phasers?

 

[Brochacho620]

What’s the difference between VCT solenoids and the Cam Phasers?

A cam phaser is just a sprocket that adjusts the position of an engine's camshaft in relation to its crankshaft.
So it’s main job is adjusting the position or the “phase” of the camshaft in relation to the crankshaft, thereby altering valve timing.
A VCT solenoid, AKA the variable valve timing solenoid is a component of the variable valve timing system that manages the oil flow depending on the engine speed and load.

 

[DougS550]

Hi all, I have a '19 5.0 GT with about 75K miles that is idling rough. I was able to catch it on video as it happened and uploaded it to this YouTube video here. The car shakes when it drops below 500 rpm but still no CEL. Anyone have any experience on this or ideas what could be causing this and would this be an expensive fix at the dealer? Thanks!

Clean throttle body, Spray intake and combustion cleaner down air intake near TB, replace spark plugs with OEM And gap IAW specs, put a can of sea foam in gas take and drive.

 

[NGOT8R]

I have the exact same issue. (2018 GT 10Speed, LTH & catless mids, P51 Intake and tuned on E85) 65k miles
After constants logs with Lund they narrowed it down to VCT Solenoids and or Cam Phasers.
Apparently it’s not rare on our cars..

If you have to go that deep to correct the problem, you might want to consider adding cams.

 

[Torinate]

Clean throttle body, Spray intake and combustion cleaner down air intake near TB, replace spark plugs with OEM And gap IAW specs, put a can of sea foam in gas take and drive.

Man, I wish it was that easy for my issues. Done all that and more but still no dice.

It’s nice Lund has given some direction as to the cause.

 

[DougS550]

Man, I wish it was that easy for my issues. Done all that and more but still no dice.

It’s nice Lund has given some direction as to the cause.

At least you eliminated the things which cause that issue. I'm actually doing the stuff I listed to you on my daughter's 17 Tucson for idle surge this week end. Good luck

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