Light accelleration seems 'jolty' under load - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 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 and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-09-2007, 11:04 PM   #1
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Default Light accelleration seems 'jolty' under load

When going up hills, I can feel like of like a light jolty sensation. It'* not enough to say omg there'* something wrong, but I've had people ask me why my car is hesitating going up hills. I pulled two spark plugs from the front of the engine 2k mi ago and they looked fine, but perhaps they're bad deep inside? How common is it for a 87k mi vehicle to have bad spark plug wires, and what plugs/wires do you suggest?

Btw, A/C amplifies the sensation so it'* definitely in the motor.
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Old 10-09-2007, 11:18 PM   #2
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I troubleshot this problem as an ignition problem for a long time. Finally got frustrated and took it to a dealer. Turns out the transmission was posting lots of slip codes. I drove it like that for probably a year until one day the tranny just quit. Something finally broke I guess. It never slipped bad, just the jerking thing under load at low rpm. Usually around 50-60 mph going up a hill. Afetr the tranny was rebuilt it never happened again, so I guess that was it. That'* not to say you don't has an ignition miss, just saying it could be your transmission.
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Old 10-09-2007, 11:21 PM   #3
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This is the third trans thats did it then. Because the first one was the one that came with the car, liked to downshift into neutral when you floored it between 25-35 MPH. They replaced it with one that the TC was locking @ 29 MPH, and was a REALLY rough lock. Also gears weren't smooth at all. Now the one I have, you can still occasionally feel a rough 3-4 gearshift when torque converter is locked. Only difference between the 'shudder' in this transmission and the first trans, the first trans you could actually see it on the tach, this one you can't.

If I'm going to change plugs and wires, I'd like to do fuel filter (which I already have), PCV, clean TB, and maybe O2 sensors. Are there any specific things I should be looking at make/model wise? I've heard the NGK plugs are the way to go...
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Old 10-10-2007, 01:03 AM   #4
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The key points here are UNDER LOAD and UPHILL.

This is ignition related, not trans.

Plugs/wires/coils.

Coil troubleshooting is in Techinfo. Pull all 6 plugs, and take a pic of them so we can 'read' them.

At night, with no underhood light on (very dark) at idle, mist water from a windex type sprayer all over your coils and plug wires (end to end) and watch for arcs.
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Old 10-11-2007, 01:40 AM   #5
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Alright. For some reason... the spark plug sockets the girlfriend'* house has do not fit my spark plugs, all three of them. ???. lol. They say 13/16, perhaps the ones I have at my house are a different size. I definitely dig that water bottle idea... props to you. As soon as I get the plugs out, I'll take pics and post. Thx.
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Old 10-14-2007, 11:19 PM   #6
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Got the plugs swapped. Got a set of Autolite 605s gapped to .060". Lost my gapper, went to walmart to buy one, almost got in two accidents in my moms minivan because apparently a large red 05' town and country with headlights on and the extended rear isn't big enough or brgught enough to be seen coming to stop infront of you. Then I found out the plugs are default gapped to .060" at the factory lol.

It definitely feels better, and I haven't yet felt the stuttering up hills. Matter of fact, I think it was hestitating up hills... because now I don't need to lay in the gas (for some reason transmission doesn't unlock tc above like 45 unless u press throttle past half... not sure if that'* a bonneville thing or a pos trans things). I'm able to lay patches now too slightly better... cept for stupid transmission jumping between first and second gear, even though gear selector is in first gear. Any way to override that/delete in pcm reprogram?

Here'* what the plugs look like. Look pretty standard to me for plugs that I think are probably origina (88k mi)l:

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Little bit of build up on the tips of the electrodes and the contact point on the ground prong

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One came out anyway... and it'* kind of a cool picture lol.

New Borg Warner plug wires ($15) will be here on the nineteenth to try out. Figured for $15, it doesn't hurt to try them. Oh yeah, replaced PCV valve today as well. Searched for about an hour before I decided to hop on here and find it.
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Old 10-15-2007, 11:01 AM   #7
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