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Author
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Topic: ROUGH VIBRATION AT IDLE
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86 T TOPS
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Member # 8855
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posted
 
 
86 GT , GT4O HEADS AND E-303 CAMJUST CONVERTED TO MASS. BUT VIBRATES VERY ROUGH AT IDLE IVED CHECKED ALL VACUM LINES AND THEY ARE ALL OK I HAVED BEEN TOLD THAT I CAN BE THE HARMONIC BALANCER BUT NO SURE . ANY HELP WELCOME !!!!!
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TTOPNGT
Posts: 704 | From: redwood city | Registered: Jan 2009
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5.7L EATER
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Member # 9451
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posted
check ur timing
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Trickflow hurst with the nitrous burst makes the sport coupe fly and the chevy boyz cry
Posts: 26 | From: Sacramento | Registered: Sep 2009
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Rigo5.0
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Member # 5247
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posted
Could be timing is off, or just as you mentioned- harmonic balancer. I had a very similar problem and it turned up to be a bad balancer. Check to see if the rubber piece in between the balancer is coming apart.
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91 5.0 [331|T56]
87 Grand National
02 Z06
08 Challenger SRT8
13 Shelby GT500
00 Lightning
14 Camaro SS
Posts: 1454 | From: Kansas City | Registered: Jan 2005
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P.B.R .stangs
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Member # 6544
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posted
if it feels like a bad miss check the timing, if the timing is good and there are no vac leaks and its still missing you might of bent some valves if you put a cam in a stock 86 flat top piston motor. hope thats not the case goodluck.
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86 gt (parted out)
90 lincoln mark 7 (sold)
99 cobra (sold)
89 5.0 lx hatch (sold)
Posts: 167 | From: fair oaks/sacramento | Registered: Feb 2006
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86 T TOPS
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Member # 8855
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posted
WELL I HOPE ITS NONE OF MY VALVES CUS I JUST RECENTLY SWAPED TO GT4O'S AND I DOUBT ITS THE TIMING BECAUSE WHEN I ACCELERATE SOUNDS FINE AND WHEN ITS THE TIMING IT USUALLY MISS FIRES . MY GUESS
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TTOPNGT
Posts: 704 | From: redwood city | Registered: Jan 2009
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86 T TOPS
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Member # 8855
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posted
I FORGOT ITS AN 89 MOTOR NO FLAT TOPS !!
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TTOPNGT
Posts: 704 | From: redwood city | Registered: Jan 2009
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MikeD.
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Member # 8060
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posted
Yeah see if your harmonic balancer is going crazy.
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1999 FRC Vette
12.77 @ 110
Posts: 2854 | From: Vacaville Ca, 707 | Registered: Nov 2007
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JohnB
Tech Moderator
Member # 969
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posted
Balancer or timing is completely wrong. Had a car a few weeks ago that was 10* the opposite way...it ran a "little bit" rough. ![[Wink]](wink.gif)
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1965 Shelby Cobra
1993 Cobra
2012 F150 Raptor
2020 GT500
Posts: 6523 | From: Orlando FL/Redding CA | Registered: Mar 2002
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89Rodknocker
CAFords OG
Member # 2951
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posted
quote:
Originally posted by JohnB:
Balancer or timing is completely wrong. Had a car a few weeks ago that was 10* the opposite way...it ran a "little bit" rough.
Yeah what he said.
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89 lx (stolen and stripped)
94 gt runner (sold)
89 lx Stock(sold)
86 gt T-trim (sold)
73 Camaro BBC
01 5.0 Explorer limited Borlas (sold)
Posts: 2488 | From: Bay Area | Registered: Jun 2003
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86 T TOPS
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Member # 8855
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posted
Thanks alot folks ill check the timing and the balencer hope its nothing major !
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TTOPNGT
Posts: 704 | From: redwood city | Registered: Jan 2009
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