93 bonneville maybe rough/low idle?

Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's, Olds 98 91-96, Buick Lesabres and Park Avenue 91-96. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
Post Reply
User avatar
Troyport
Posts like an LN3
Posts like an LN3
Posts: 472
Joined: Tue May 27, 2008 8:23 am
Year and Trim: 1993 Bonneville SE, restoration finished
Location: Hiram, Ohio

93 bonneville maybe rough/low idle?

Post by Troyport »

New plugs, wires filters during the resto. Fuel rail is spotless inside, injectors were all cleaned and tested, new fuel reg, all new vac lines, no leaks of any sort, everything works perfectly. At idle when fully warmed in gear, idles about 500-600, and fluctuates, feels like an occasional miss. Never stalls, and never hesitates off idle, runs perfectly otherwise. No stumbles or misses even at low rpm in high gear under load. Honestly, this car was off the road for so long I can't remember if it always did this. All I know is that my other "H" chassis car is silky smooth at idle. Thoughts? Mike.
Image

1993 SE with SLE appearance package. Factory stock except for steering wheel buttons, AM/FM/CD from a '93SSEi and chrome wheels.
1999 Olds Eighty-Eight LS Anniversary Edition, my daily driver.
2004 Chrysler Minivan, wife's daily driver.
Top
User avatar
J Wikoff
Administrator
Administrator
Posts: 17080
Joined: Mon May 19, 2008 7:01 pm
Year and Trim: 1992 SSE
2009 G8 GT
Location: Central Illinois
Contact:
Contact J Wikoff

Re: 93 bonneville maybe rough/low idle?

Post by J Wikoff »

I'd check the coil resistances, and if the ICM mounting points are clean for a good ground first.
Image
WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights
Top
User avatar
Troyport
Posts like an LN3
Posts like an LN3
Posts: 472
Joined: Tue May 27, 2008 8:23 am
Year and Trim: 1993 Bonneville SE, restoration finished
Location: Hiram, Ohio

Re: 93 bonneville maybe rough/low idle?

Post by Troyport »

Everything is spotless, and I already swapped the coils and the ICM. No change at all.
Image

1993 SE with SLE appearance package. Factory stock except for steering wheel buttons, AM/FM/CD from a '93SSEi and chrome wheels.
1999 Olds Eighty-Eight LS Anniversary Edition, my daily driver.
2004 Chrysler Minivan, wife's daily driver.
Top
KL Mallender
SE Member
SE Member
Posts: 21
Joined: Mon Jun 28, 2010 5:18 pm
Year and Trim: 1994 SSE

Re: 93 bonneville maybe rough/low idle?

Post by KL Mallender »

Mass air sensor? if you can figure out whether it is a random missfire affecting all cylinders intermittently or if it's a dead miss on a single cyl would help to narrow down the possibilities. good luck.

Kevin.
Top
Post Reply

Return to “1992-1999”