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2003 Pontiac Montana Starting problem
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airpolice
Novice
Sep 6, 2012, 3:37 AM
Post #1 of 11
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2003 Pontiac Montana Starting problem
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Hi all,
I have a 2003 Pontiac Montana with 132,000 miles. I took the van on a road trip to Chicago and back in 1 day. Van ran like a top. The next morning when I went to start it, the engine cranked over real slow with a high pitch noise. When it did finally start it was running really rough, stumbling and then the engine shut off. I took it to my local mechanic and they said it was the MAP sensor. They leak checked the head gasket and found it was not leaking. Well, the engine is still starting slow in the morning. Almost feels like maybe an injector is not closing and loading up the cylinder. Any help in this would greatly be appreciated!!!
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 6, 2012, 4:52 AM
Post #2 of 11
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Re: 2003 Pontiac Montana Starting problem
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What, if any codes are being stored in the computer.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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airpolice
Novice
Sep 6, 2012, 5:49 AM
Post #3 of 11
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Re: 2003 Pontiac Montana Starting problem
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Good question. I will check with the shop to see what codes were present and post here when I find out.
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airpolice
Novice
Sep 6, 2012, 5:58 AM
Post #4 of 11
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Re: 2003 Pontiac Montana Starting problem
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Shop said it threw a code for a Bad MAP sensor. They replaced the sensor but the problem still exists.
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nickwarner
Veteran
/ Moderator
Sep 6, 2012, 2:11 PM
Post #5 of 11
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Re: 2003 Pontiac Montana Starting problem
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There are about 6 different codes that reference the MAP sensor. We need the exact code number.
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Discretesignals
Ultimate Carjunky
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Sep 6, 2012, 6:06 PM
Post #6 of 11
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Re: 2003 Pontiac Montana Starting problem
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When you mean starting slow, do you mean the starter motor is cranking the engine slowly? have you had the battery tested and the terminals inspected?
Just wondering because a low voltage battery condition doing cranking can actually cause the PCM to wig out and possibly throw erroneous trouble codes. It can even erase what it has learned in memory for things such as idle control and fuel trimming causing stalling concerns after start up.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Sep 6, 2012, 7:30 PM)
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airpolice
Novice
Sep 8, 2012, 5:30 AM
Post #7 of 11
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Re: 2003 Pontiac Montana Starting problem
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The Battery has not been checked but the engine starts perfectly once the stumbling clears up. I called my mechanic who changed out the MAP sensor for the code numbers but he did not have them. Might take the van over to Autozone and see if the codes are still stored. This issue does not occur when the local mechanic has the van. It seems it occurs after driving it around and then sitting overnight outside.
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Discretesignals
Ultimate Carjunky
/ Moderator
Sep 8, 2012, 5:32 AM
Post #8 of 11
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Re: 2003 Pontiac Montana Starting problem
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Probably wouldn't hurt to have the battery tested while your at Autozone. If it is a top and side post battery, make sure they test at the side posts.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Sep 8, 2012, 5:34 AM)
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airpolice
Novice
Sep 8, 2012, 5:44 AM
Post #9 of 11
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Re: 2003 Pontiac Montana Starting problem
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Good idea!
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airpolice
Novice
Sep 17, 2012, 1:17 PM
Post #10 of 11
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Re: 2003 Pontiac Montana Starting problem
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I haven't been able to go to my local Autozone but, last week I finally cleaned my wifes side of the garage so she could park the van in it again. Guess what? The van has started like normal ever since we started parking in the garage. So just for grins, Friday night i parked the van outside over night. In the morning I went out to try and start it and same problem. Im thinking this could be a moisture related issue with either the coil pack or plug wires.
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nickwarner
Veteran
/ Moderator
Sep 17, 2012, 8:36 PM
Post #11 of 11
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Re: 2003 Pontiac Montana Starting problem
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There are a lot of things it could be. Thats why we need the codes. If you suspect moisture issues, mix up a bottle of salt water. Turn the lights down dim and run the engine. Start spraying the ignition components. If the engine hiccups or you can physically see arcing you have found the issue. Salt water is a better conductor of electricity so make sure that's what you use.
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