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PostPosted: Fri Jul 10, 2009 4:16 pm 
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Joined: Tue Feb 03, 2009 7:48 pm
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Year and Trim: 1996 SSEi, Bright White, Medium Teal, 197k
Hey guys-

I know it's not directly a 3800, but I figured it was close. I've got a '93 century at the shop here, 77k on the clock. It's a 3300 V6 TH125 3-speed auto.

It's got an issue with the idle and light throttle cruising. At idle it stumbles and runs slightly rough, both in park and in gear. Going down the road, it's got tons of power, no hesitation, goes like hell, but at a steady cruise you can feel it jerk like it's missing slightly. No codes, history or current.

I've replaced: Plugs, wires, checked fuel filter (clear), cleaned MAF (no difference), replaced one fuel injector that wasn't above 12 OHM's as per spec, no difference. Swapped all 3 coils and module for known good ones, no difference. Fuel trim is right where it should be, TPS values are fine, as are MAF values. Fuel pressure is dead on, 37 PSI running 45 PSI key on engine off. FPR is good and not leaking. No vacuum leaks around the intake or any hoses.

I'm really at a loss here, i've got nothing to go on. I'm thinking possible CKP sensor at this point, but it just doesn't fit the bill.

If any of you have dealt with a finiky 3300 please fill me in!

Thanks everyone!

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Mods: Clear corners, gutted airbox, Alpine CDA-9886. Plans: 4x SensaTracs, high-flow, FM 80, 3.5 pulley, and for gods sake some good rubber.


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PostPosted: Fri Jul 10, 2009 4:47 pm 
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Certified Bonneville Nut
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Location: NE Ohio Original join date - March 2006
Year and Trim: ‘12 Jeep Grand Cherokee Overland Summit
The thing with the 3300 is it has a batch fire fuel injection system that heavily relies on the crank sensor, as the 3300 lacks a cam sensor. I would check the crank sensor, as it seems to be the only thing left that is vital.

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1996 Thunderbird LX - 3.8


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PostPosted: Sat Jul 11, 2009 9:33 am 
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Year and Trim: 1996 SSEi, Bright White, Medium Teal, 197k
That's what I was thinking. It seemed to get better though so I let the car go. If she comes back and complain I'll do something about the crank sensor. I didn't want to go through the extra work of doing it just yet if it wouldn't help anything, but that was really the last thing on the list of things to check, since everything else was fine.

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Mods: Clear corners, gutted airbox, Alpine CDA-9886. Plans: 4x SensaTracs, high-flow, FM 80, 3.5 pulley, and for gods sake some good rubber.


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PostPosted: Mon Jul 13, 2009 7:56 pm 
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Joined: Tue Feb 03, 2009 7:48 pm
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Year and Trim: 1996 SSEi, Bright White, Medium Teal, 197k
Boy to I feel stupid....

I changed the crank sensor and tried a brand new ICM, and swapped computers. No change in symptoms. Then it hit me.... check the plug gap!!

Sure enough... all three rear plugs had gaps between ZERO and .025. DUH!!!! First rule of fixing a car: Check your work! The very first thing I did was replace the plugs, I should have checked that before anything else!

Anyways... It's all fixed. It's still got a little vibration at idle, but i've felt a few 3300's that feel like that, so I think it'll be alright.

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Mods: Clear corners, gutted airbox, Alpine CDA-9886. Plans: 4x SensaTracs, high-flow, FM 80, 3.5 pulley, and for gods sake some good rubber.


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PostPosted: Thu Jul 16, 2009 8:58 am 
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Joined: Mon May 19, 2008 2:08 pm
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Location: Space Coast, or at least it used to be
Year and Trim: 03 SLE, 95 SE, 95 TS SE
The Vibration at idle in those is normal as they do not have a balance shaft... Idle through 1500 is where it may be noticed the most... :wink:


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PostPosted: Thu Jul 16, 2009 12:07 pm 
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Certified Bonneville Nut
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I remember with my Ciera's 3300, I got it a bit cheap because it would barely idle and kept stalling. Never really did figure out what one thing it was, but I replaced everything except the crank sensor and it ran perfect! Did oddly stall and not start on a few random occasions after coming off a large hill, never did figure that one out...but overall a pretty excellent engine nonetheless.

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Now: '15 Toyota Prius III | 134 hp 2ZR-FXE | Silver | 36k
Now: '03 Honda CR-V AWD | Slow 4-Cylinder | Dirt | 180k

Then: '07 Ford Fusion SEL | 221hp Gen I VVT Duratec 3.0 V6 | Tungsten Silver | 150k
Then: '99 Toyota Avalon XL | 200hp 1MZ-FE 3.0 V6 | Diamond White | 189k | Sold: July 2015
Then: '11 Ford Fusion SEL | 240hp Gen II VVT Duratec 3.0 V6 | Ingot Silver | 84k | Totaled: Oct 23 '14 (Rear-Ended)
Then: '96 Buick Park Avenue Ultra | 240hp Series II L67 | Medium Dark Lichen | Bought: JAN 11 @ 135k | Accident: FEB 3 '12 | Crushed: MAR 1 '13 @ 153K
Then: '98 Pontiac Bonneville SSE | 205hp Series II 3800 L36 | Topaz Firemist | Bought: NOV '09 @ 74k | Accident: MAY 28 '10 | Crushed: MAR 15 '11 @ 84k
Then: '93 Pontiac Bonneville SE | 170hp Series I 3800 L27 | Dark Yellow Green | Bought: JULY '07 @ 92k | Sold: JULY '12 @ 118k
Then: '89 Pontiac Bonneville LE | 165hp 3800 LN3 | Medium Garnet Red | Bought: JAN '05 @ 117k | Sold: SEP 30 '07 @ 152k


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