Lacking Power - Page 2 - 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 05-17-2007, 07:47 PM   #11
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yeah 95 told me to get one just slipped my mind i had alot going ont hats primarily while i haven't been back in awhile. but now im hoping to get all of this straightend out. The leaks have been fixed for about 3-4 weeks now so i haven't the slighest idea how long it takes to adjust but im guessing 3-4 weeks should be plenty. It almost seems like there is a faulty spark plug wire/spark plug. Because today driving home i felt like i was almost at peak power again but on other start ups it feels weak as hell especially in first gear. its almost as if the gas pettle isn't responding properly to the amount of pressure im putting on it. I dunno. Like you all have said looks like i need to get a scan tool and get some data. Also my idle is pretty choppy and it dips alot from 1grand. IS there anyway to get this to maintain at a constant 1grand and get rid of the choppiness? Im pretty sure increasing the idle would work but i would rather get your opinions on it.

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~aaron
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Old 05-17-2007, 08:00 PM   #12
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If there is a misfire or mechanical issue of some kind, it'* probably causing your uneven idle. You DO NOT want to change parameters like idle speed when the engine isn't running properly. When you say a choppy idle, what exactly do you mean? In order for us to troubleshoot any of your problems, your descriptions need to improve a bit. Give us RPM fluctuations, specific behaviors, etc. Simply saying you have a "choppy idle" that "dips a lot from 1 grand" isn't enough information for anyone to help you.

Not trying to be a butthole here... trying to get you to help us help you
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Old 05-17-2007, 10:26 PM   #13
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okay here goes my "INDEPTH" explanation

okay when i start it up it warms the engine up by maintaining a solid 1.5 RPM then once it heats up the idle drops to about 1 grand but after about 5-7 seconds the idle dips from the 1 RPM line fluking to maintain 1 grand. It stutters when sitting like jumps low then increases its idle to try and hit 1 RPM. But drops off trying not to over exert the 1 RPM line but then repeats the process because it dips too low. If it sitting in say a drive through line and i try to let the car drag itself its stutters and pulls hard on the engine. It feels as if the car is jutting forward pulling. I think possibly my timing might be off as well. What do you think? Hopefully this helps even more!

~Aaron
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Old 05-19-2007, 02:28 PM   #14
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just going to bump this before it falls off the page... thanks.
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Old 05-19-2007, 02:41 PM   #15
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Could be a weak coil.
http://www.bonnevilleclub.com/forum/...e=article&k=33
Where are you located?
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Old 05-19-2007, 03:21 PM   #16
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Have you double-checked the engine bay to make sure all your sensors are firmly connected, and all wiring is intact? I have had troubles similar to this before. Do a resistance check on your ignition coils if you have a multimeter (procedure is in Tech Info), and also think about cleaning your MAF sensor with electronics cleaner spray or a cotton swap with rubbing alcohol (use a VERY light touch on the filaments in the MAF!). You may also want to specifically look at your coolant temperature sensor... when mine failed I got some really weird idling issues, problems with startup, and sometimes the idle would fluctuate as voltage was flowing intermittently.

Other than that, verify that your spark plugs and wires are in perfect working order. Even if your wires look great, check their resistances with an ohmmeter. Procedure should be in Tech Info, and resistances should be proportional to the length of each wire (i.e., longest wire has highest resistance, shortest wire has lowest resistance, etc.).

And by all means, get access to a scan tool. At the very least you can rent one for a day from Autozone, Checker, O'Reillys, or whatever chains are in your area. Usually you just put down a deposit, then use it for a day without any fees. A good scan may point us in the right direction for troubleshooting.
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Old 05-19-2007, 05:04 PM   #17
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yeah just picked up a OBD-II scanner today from advanced. So im just gonna hook it up and run some scans.. not exactly sure how to run this bad boy but it can't be too complicated. I'll check into it all and get back to ya.

Located in Colorado btw.
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Old 05-21-2007, 07:18 PM   #18
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Okay so i ran all of the scan and they all came up clean.. maybe im insane?
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Old 05-21-2007, 10:39 PM   #19
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Codes are not what you're interested in. You need to know shift points, air/fuel ratios, KR, timing, etc.
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Old 05-22-2007, 12:44 AM   #20
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Then can someone hook me up with a site or something for a better scan tool or some store that carries them? That OBD2 #9175 didn't have what i was looking for then.. it didn't have the live sensor data because the one i bought didn't so **** except for run codes, MIL, and some other garbage. Check'd the whole manual and nothing about Shift points, yatta yatta. So a website/store/name of scanner would be much appreciated.
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