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 Small engine vibration at idle

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jdbell2004
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jdbell2004
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Small engine vibration at idle Empty
PostSubject: Small engine vibration at idle   Small engine vibration at idle EmptyTue Jul 29, 2008 11:38 am

1997 NA with 103K. I noticed when I got the car that the engine vibrates enough I can feel it while in the drivers seat. A friend of mine told me it seems like its missing a little. I don't feel it under load. Should I start by changing plugs? What brand and gap?

-Jon
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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptyTue Jul 29, 2008 12:37 pm

That sounds like a good start. Maybe replace the ignition wires, too. Any brand plug should work. Gap = .060"

_________________
'05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26

'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes

'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

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'70 Ninety-Eight Holiday Coupe 455cid • 116k miles
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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptyTue Jul 29, 2008 1:16 pm

My car used to 'spit' a little at idle. I had some bad injectors. Put 'new' (cleaned and flow tested) injectors in and idle cleared right up.

After, of course, everything else is in proper tune.
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AA
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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptyTue Jul 29, 2008 1:18 pm

Maybe try some injector cleaner before changing them out, but deekster is right - could be injectors acting up.

_________________
'05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26

'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes

'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'70 Ninety-Eight Holiday Coupe 455cid • 116k miles
^^^ SOLD ^^^ frown
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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptyTue Jul 29, 2008 6:35 pm

cleaning the MAF and changing the fuel filter are some more things you may want to try after the plugs and wires.

_________________
1996 with 254k miles, L32 4" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP
AMG C400 White on black. Stage 2 w/E30 - 11.9@117 -daily
Small engine vibration at idle Dsc_0110
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manofmany
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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptyTue Jul 29, 2008 6:35 pm

Seafoam FTW
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jdbell2004
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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptySat Aug 02, 2008 2:47 pm

I checked the service records, the plugs and wires were just changed 20K miles ago. I just filled up with premium and things seem to be running better. I suppose I could check, but what octane rating gasoline should I use? How do these cars run on gas with ethanol? Regular gasoline here has ethanol in it.
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jdbell2004
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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptySat Aug 02, 2008 2:48 pm

manofmany wrote:
Seafoam FTW

My gas gage reads incorrectly and I heard it's because the float starts to rust. If I run seafoam, will it break this rust up and clog the injectors or filter?
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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptySat Aug 02, 2008 3:02 pm

Although it may have seemed to help, using premium shouldn't make any difference with the N/A 3800. Shell's "V-Power" is supposed to have extra cleaning agents in their premium that could make a difference, but otherwise I wouldn't waste the money. Use 87 octane.

Regular gas only has a small % of ethanol. Using E85 will not result in less power output, and it will clean out your tank and fuel lines, which could result in clogged filter or other problems. I wouldn't use straight ethanol in your car.

I think you'd have to out a lot of seafoam in the tank to break the rust up that much, but changing the filter is rather easy, so why not?

_________________
'05 GTO 6.0L • 6-spd • 95k miles • 0-60: 4.8s • 16.9 avg MPG • Nelson Ledges Lap: 1:26

'95 Celica GT 2.2L • 5-spd • 165k miles • 0-60: yes

'98 SC Riviera • 281k miles • 298 HP/370 TQ • 0-60: 5.79s • ET: 13.97 @ 99.28 • 4087 lb • 20.1 avg MPG • Nelson Ledges Lap: 1:30
3.4" pulley • AL104 plugs • 180º t-stat • FWI w/K&N • 1.9:1 rockers • OR pushrods • LS6 valve springs • SLP headers • ZZP fuel rails
KYB GR2 struts • MaxAir shocks • Addco sway bars • UMI bushings • GM STB • Enkei 18" EV5s w/ Dunlop DZ101s • F-body calipers
EBC bluestuff/Hawk HP plus • SS lines • Brembo slotted discs • DHP tuned • Aeroforce • Hidden Hitch

^^^ SOLD ^^^ frown

'70 Ninety-Eight Holiday Coupe 455cid • 116k miles
^^^ SOLD ^^^ frown
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http://www.cardomain.com/ride/657082/4
jdbell2004
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jdbell2004


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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptySat Aug 02, 2008 11:55 pm

I'm going to take a video from inside the car to show you how the rpm's bounce a little. I'll shift through the gears as well.
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jdbell2004
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jdbell2004


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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptySun Aug 03, 2008 2:51 am

Small engine vibration at idle Th_P1050173

Is this normal? The car was already warm. It seems like it idles high. I shifted from park to reverse to drive then back to park. It wasn't really idling rough during the video. It seems to be intermittent.
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96RIVMANN
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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle EmptySun Aug 03, 2008 9:49 am

I had the same problem on my '96 so I decided to pull the throttle body off and clean the MAF and up inside the super charger.

https://rivperformance.editboard.com/series-i-engine-transmission-f13/mass-air-flow-t2149.htm
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Small engine vibration at idle Empty
PostSubject: Re: Small engine vibration at idle   Small engine vibration at idle Empty

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Small engine vibration at idle
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Riv Performance ::   N/A 3800 Tech :: Series II N/A Engine, Transmission, PCM-
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