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Pontiac Grand Prix Starting / Stalling Issues

208 messages,  Last post on Nov 02, 2009 at 2:18 PM

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#159 of 208 getting a firmware update by arenburg Apr 22, 2009 (12:58 am)
I assume you need to see your dealer for this, I just think its interesting because I've never herd tell of a software update for a car computer before. Will this help with my stalling Issue? It seems to me that a fair amount of people are have this similar issue. (starting and stalling). Replies to this message: prochie (Apr 22, 2009 1:48 am) arenburg (Apr 28, 2009 10:15 am)
#160 of 208 Re: getting a firmware update [arenburg] by prochie Apr 22, 2009 (1:48 am)
Replying to: arenburg (Apr 22, 2009 12:58 am) It doesn't surprise me so much. My first job in IT was working for a Freightliner Dealership. The mechanics had me do the firmware updates and programming for the assortment of engines (benz, detroit, cummins) because it involved touching a keyboard. On these larger rigs you can actually do an in-flight diagnostics and tune-ups remotely over a cell phone uplink. Adjust fuel intake and lifters etc. - it is pretty amazing. Photocopier companies also rely heavily on firmware updates to fix manufacturing flaws and timing issues in their engines after the product goes to market.   Anyways, even though these are GM cars a lot of stuff is computer driven - for example the gas pedal is a fly-by-wire system which explains why I loose gas when the computer crashes. The firmware update is a dealer task. I doubt that the average mechanic would be able to get their hands on the software unless they are paying for a high-end service catalog but the battery cable looks easy enough and I'm hoping that solves the issue. Firmware updates can be risky there is a 50% chance they can toast the computer module. There are some very good mechanics at some GM dealerships but most of these are knuckle draggers. I wish I could do it myself - at least I would know what I was doing.   I'm going to the dealer to pick-up some parts I'll ask what is involved and will get back here next week. Less ambiguity. I don't really expect this to solve the starting/ stalling problem - just the stalling at highways speeds.   However, while writing this email I did think of something, there is no throttle cable but there must be something throttling the engine. I would imagine there would be build-up and wear on this component. If this sticks it would idle the engine roughly and too high at times or stall the engine by not giving it enough gas. Just a thought, I'll have a look at mine.
#161 of 208 Stalling/Not starting by happyland29 Apr 22, 2009 (12:19 pm)
I have a "97 Grand Prix GP with 46k. Whether I've driven it for 5 mins or 3 hrs,after stopping and turning engine off, if will not retstart, engine turns over real healthy, but will not fire. If I wait for 3 hrs (approx) it will then fire off, like there was never a problem. But I must wait at least 3 hrs before attempting to restart. If I attempt to start it any sooner than 3 hrs, it will not be successful and I will have to start 3 hr cycle all over again. What kind of problem does this appear to be, other than the fact it's a Pontaic ? Replies to this message: arenburg (Apr 28, 2009 10:07 am)
#162 of 208 addition to #151 by angcan Apr 22, 2009 (9:43 pm)
is replacing the fuel pump the same as replacing the fuel pressure regulator? or are these 2 unrelated parts? Replies to this message: cristyz (Apr 28, 2009 1:30 pm)
#163 of 208 Re: Stalling/Not starting [happyland29] by arenburg Apr 28, 2009 (10:07 am)
Replying to: happyland29 (Apr 22, 2009 12:19 pm) This could be the anti theft system shutting down the engine. (thinks its being stolen.
#164 of 208 Re: getting a firmware update [arenburg] by arenburg Apr 28, 2009 (10:15 am)
Replying to: arenburg (Apr 22, 2009 12:58 am) I had the crankshaft position sensor replaced in my car. After having it back for less then 30mins the thing hitched and the check engine light started flashing. I barley got it back to the shop. it stalled on me once. When it was scanned, it only showed a minor skip. This was preformed while the technician had it out for a spin. Other then that it ran great. All he can figure is that one of the coils are weak. hopefully this was just a glitch time will tell. By the way does anyone have any idea what a new coil pack costs?
#165 of 208 Re: addition to #151 [angcan] by cristyz Apr 28, 2009 (1:30 pm)
Replying to: angcan (Apr 22, 2009 9:43 pm) No these are two different parts. The fuel pressure regulator is located at the front of the engine. I had this fixed and I have not had any stalling issues since then.
#166 of 208 Re: 2000 grand prix starting problems [wwpatte] by heffemeyer May 10, 2009 (6:58 am)
Replying to: wwpatte (Jul 16, 2008 7:49 pm) Did you ever find the solution to your starting problem. I have a 99 GTP, took it to the gym Thursday, jumped in Friday and no start. Doesn't even attempt to turn over no click nothing, I have power to everything else, tried jumping no change, dropped starter and it tested fine, any ideas, seems to be no power to the starter but checked and there is voltage at the starter??? Replies to this message: showbizjake (Aug 12, 2009 5:49 pm)
#167 of 208 They think they fixed it by arenburg May 23, 2009 (5:57 am)
After having no success at my local shop I had to have a GM dealer come and pick up the car at a cost of 75 bucks. They say it is the Cat converter. I would recommend that before you start messing around with sensors have a back pressure test down to see if youre cat is the problem. What I can't figure out is why it went really nuts when they put the new CPS sensor in. Perhaps both were bad, but before that the car worked. Not great but it ran. Here's to hoping that this fixes the problem, will let you all know.   My car has 121,000km's on it my so they replaced cat converter for free, the PCM is also covered. So if anyone else is having similar difficulties ask your dealer about this. FOr my car its covered until 130 or april of 2012.
#168 of 208 GM dealer???? by arenburg May 27, 2009 (5:10 am)
Well Gm techs are unable to figure out what's wrong with this piece sh. Ignition mod, cat converter nothing seems to be working # 1 and Number 4 cyl are acting up they are calling in an electrical specialist in today to try and determine what the problem is.I say its mechanical or PCM whatwvwer it is this will be the last GM I ever buy.

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