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#1
04-24-2005, 10:02 AM
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99 Camaro missing and bucking
Hey everyone, got a problem I could use some help with. My 99 3.8 is bucking pretty bad whenever the engine is under a light load. The problem is especially bad when trying to pull from low rpms. The problem is not always there but does seem to be getting worse (more frequent). I know I should start with a complete tune up, but right now I just purchased a blazer and am pretty wiped out. By the way the car has about 45k on it. I am thinking maybe the cat is starting to block up but am looking for any help. Thanks alot in advance.
Jeff
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2000 Pontiac Grand Prix GTP 
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#2
04-24-2005, 12:22 PM
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Re: 99 Camaro missing and bucking
yea man, first theing I'd say is the tuneup, so I guess... start saving? :/
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97 Camaro - 2.077 60', 14.745 @ 92.20 - still down, one year later. 194k miles-160* thermo-V8 shocks/springs (V6 rear springs)-3" Magnaflow !cat (3" dynomax bullet) back-SLP CAI-stock boxed LCAs-poly tranny mount and torque arm bushing-custom HPTuners tuning-4.10s/eaton/TA girdle-3.5" alum DS-spohn LCA brackets-prostar skinnies 179.75 RWHP, 204.52 RWTQ ON ITS WAY: MORE R.I.P. Andy 87 Benz 190e - DD 01 EX250 - still gotta get my license for this thing
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#3
04-24-2005, 03:49 PM
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Re: 99 Camaro missing and bucking
Firstly, do you have an SES (Service Engine Soon) light on? If you do, take it to Autozone for a FREE scan. That will pinpoint your problem.
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#4
04-24-2005, 05:52 PM
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Re: 99 Camaro missing and bucking
Not getting any fault lights at all. Here's a little more info for you. The car idles perfect and it usually will do it going uphill it seems fine on a downhill and usually ok with cruise on. Just during acceleration when the engine is under load.
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2000 Pontiac Grand Prix GTP
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#5
04-24-2005, 08:22 PM
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Re: 99 Camaro missing and bucking
clutch? or anything having to do with it? have you recently changed it?
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#6
04-25-2005, 02:45 PM
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Re: 99 Camaro missing and bucking
do you mean something liek bogging? might wanna check the spark plugs, wires, and the cap and distributor.
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#7
04-25-2005, 09:57 PM
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Even though your MIL is not on you could still have a code, or almost a code. Some take a Drive Cycles to set the light
I am just guessing here, so don't waste your money on my stupid guess. I would suspect a MAP sensor is at fault. It is your main load sensing sensor. Another guess would be your EGR valve sticking closed, but this usually happens at slightly higher rpms. The EGR reduces NOX by lowering combustion temps, and if it is sticking when it is supposed to be open, this can result in pinging and/or detonation. That said, if you do save some money, a tune-up would not be a terrible start. But like the previous guy said, you might want to get a free scan from your local Autozone, if you have one.
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#8
04-26-2005, 06:14 PM
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Re: 99 Camaro missing and bucking
Thanks for the input everyone. Will soon be getting her tuned up now that the weather is getting nice. Hate working on the car in the freezing PA weather
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2000 Pontiac Grand Prix GTP
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