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Poor Engine Performance In Cold Temperature: 1996 Pontiac Bonneville
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BonnieProbs
Anonymous Poster
Mar 18, 2009, 3:56 PM
Post #1 of 9
(3846 views)
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Poor Engine Performance In Cold Temperature: 1996 Pontiac Bonneville
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1996 Pontiac Bonneville
6 cyl 3.8 L
180000 miles
This winter, my Bonneville has had difficulty accelerating (0-30 mph) in cold weather (below 30 degrees F). When at a complete stop, the car would crawl with the gas completely floored. The car accelerates slowly and eventually reaches desired speeds. The car's acceleration is normal when driving above 35 mph. After each stop, the poor acceleration acts up again. A warm engine does not appear to help this issue. The problem has gotten progressively worse and now idles poorly in cold temperatures. The check engine light turned on and two diagnostic codes were obtained: 1) EGR valve pintle position circuit 2) Cylinder misfire. It is my understanding the EGR may not be the root cause. Other root causes coud be: PCM, Engine Coolant Temperature Sensor, Throttle Position Sensor, Mass Air Flow sensor, Oxygen Sensor, Intake Air Temperature Sensor, etc. I do not know where to start. Please advise. Thank You.
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dmac0923
Enthusiast
Mar 18, 2009, 4:17 PM
Post #2 of 9
(3843 views)
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Re: Poor Engine Performance In Cold Temperature: 1996 Pontiac Bonneville
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im a little confused???? you got a trouble code for all of those sensors??????
__________________________________________________
2015 Jeep Grand Cherokee
2002 Ford Ranger
2004 Toyota Corolla
1969 Ford Mustang Mach 1
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Loren Champlain Sr
Veteran
/ Moderator
Mar 18, 2009, 4:28 PM
Post #3 of 9
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Re: Poor Engine Performance In Cold Temperature: 1996 Pontiac Bonneville
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Bonnie; I think the first order of business would be to address the misfire. What trouble code(s) did you come up with? Unless the EGR is sticking open at idle, this shouldn't be causing your problem, but don't ignore the code. Could be just a one time thing. Definitely, wouldn't jump to the PCM at this point. The various sensors that you mentioned can be checked. Live data with a scanner is best. Code pullers do just that...pull codes.
Loren
SW Washington
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BonnieProbs
Anonymous Poster
Mar 19, 2009, 8:55 AM
Post #4 of 9
(3836 views)
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Re: Poor Engine Performance In Cold Temperature: 1996 Pontiac Bonneville
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Thanks SW WA. Unfortunately, I cannot get the vehicle to act up again as warmer temperatures have moved in. Thus, I do not think the live data will show a problem. While I would like to be proactive and address the problem now, I hate to spend money if the care will not act up. If I could narrow the problem down to one or two components, I would try to address them now. Unfortunately, there are too many potential causes. Thanks again!
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Guest
Anonymous Poster
Mar 19, 2009, 8:57 AM
Post #5 of 9
(3835 views)
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Re: Poor Engine Performance In Cold Temperature: 1996 Pontiac Bonneville
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Nope, just two codes: The ERG and misfire. The components listed are potential causes (based on conversations with repair shop)
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Loren Champlain Sr
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Mar 19, 2009, 3:09 PM
Post #6 of 9
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Re: Poor Engine Performance In Cold Temperature: 1996 Pontiac Bonneville
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The misfire code will be one or more of these:
P0300 (Random cylinder misfire)
P0301 (Cyl. 1 misfire)
P0302 (Cyl. 2 misfire)
P0303 (Cyl. 3 misfire)
P0304 (Cyl. 4 misfire)
P0305 (Cyl. 5 misfire)
P0306 (Cyl. 6 misfire)
Your PCM also has misfire history capability; It will tell you how many times each cylinder has misfired. So, which of those seven codes did it show?
Loren
SW Washington
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Guest
Anonymous Poster
Mar 19, 2009, 4:18 PM
Post #7 of 9
(3826 views)
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Re: Poor Engine Performance In Cold Temperature: 1996 Pontiac Bonneville
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The misifire code is as follows: Cylinder misfire detected - random cylinders. Explanation = The powertrain control module monitors the crankshaft speed and has detected a misfire condition.
I am almost certain the misfire is related to the cold temperature issue. The problem got progressively worse throughout the winter and eventually began idling poorly. I believe the poor idling caused the misfire code. It felt like the car was not getting enough gas or air.
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Loren Champlain Sr
Veteran
/ Moderator
Mar 19, 2009, 4:31 PM
Post #8 of 9
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Re: Poor Engine Performance In Cold Temperature: 1996 Pontiac Bonneville
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That's your story and you're sticking to it. Good luck.
Loren
SW Washington
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Guest
Anonymous Poster
Mar 20, 2009, 9:03 AM
Post #9 of 9
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Re: Poor Engine Performance In Cold Temperature: 1996 Pontiac Bonneville
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Unfortunately, I still do not know how to address the cold temperature issue. Any recommendations on narrowing down the scenarios? Thanks.
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