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980 messages,  Last post on Oct 12, 2006 at 5:30 PM

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#912 of 980 grand prix problem by sfc400 Aug 18, 2006 (12:10 pm)
I know now that it is not the alternator and checked the fuel pressure which is in range.But the car still will not start.When I sprayed gas in the manifold the car started for just a moment any suggestions of what could be wrong. Replies to this message: bxd (Aug 21, 2006 11:57 am)
#913 of 980 Re: grand prix problem [sfc400] by bxd Aug 21, 2006 (11:57 am)
Replying to: sfc400 (Aug 18, 2006 12:10 pm) If you spray starting fluid or gas into your intake and the car starts, you have a fuel problem.   Is the fuel pressure gauge showing roughly 40psi both when you turn the ignition to "ON" and when you try to start the car? It shouldn't change much as you're cranking away, have a friend watch it for you as you try that.   If you have good pressure, I would lean towards fuel injectors having gone bad. They are the last stop on the fuel's trip into the engine, more or less.   But before you diagnose those, I would make sure you have good spark. Buy a spark tester and check at the front ignition wires that are convenient (one or two is fine). If you find spark (and I bet you will) then it's time to Ohm test the injectors... on that car I think you'd have to take the upper intake off to do so. You basically unclip each injector's wiring connector and check OHMS. You may find from 1 to a few of them deviating from the rest. Off the top of my head I can't remember the correct resistance but for some reason "12" is stuck in my head.... I will have to dig that up if you need it. Usually what I do is test all 6 and the 1 or 2 that are the most abnormal get replaced.
#914 of 980 Re: hesitation problems? [cgold2] by jwo Aug 22, 2006 (9:36 am)
Replying to: cgold2 (Jul 16, 2006 8:01 pm) I just want to note that Fuel injection cleaner only works on vehicles where the injectors are fairly clean or new. There are little filter baskets that are similar to a smaller version of a reusable coffee filter basket. If your injectors are really dirty all that will happen is that the chunks of grim and slug that the injector cleaner is cleaning off the insides of you rail and injectors get caught in these little baskets. Which will make your injectors spray worse and worse as the basket gets more and more clogged. If your injectors are really dirty I would suggest bringing them to get cleaned professionally by a Fuel Injection shop that has an ultrasonic cleaner. They will clean your injectors for $20/each injector and replace all the rings and filter basket for approx $5/each injector. Replies to this message: bxd (Aug 22, 2006 10:22 am)
#915 of 980 Re: hesitation problems? [jwo] by bxd Aug 22, 2006 (10:22 am)
Replying to: jwo (Aug 22, 2006 9:36 am) That's a good point. Once a car reaches a couple years of age, it's good to throw in a high quality fuel injector cleaner a couple times a year. Don't wait till there are problems. Chevron Techron is good, Gumout Regane is too. Skip the stuff that's 99 cents!! It's just alcohol. Anything that's just alcohol is a waste of money as almost all gas is 10% ethanol nowadays anyway.   If you use a high detergency gasoline on a regular basis, that will cut down on the need for cleaners. Do a google on "top tier gasoline" to learn more.   As far as professional fuel injector cleaning, it's not a bad idea, but GM injectors do fail electrically. It's common after 100k miles. So it's a better long term investment to replace them with new ones if you plan on keeping the car a while.
#916 of 980 '99 Grand Prix GT Information Center Display lost illumination/brightness by knepski Aug 22, 2006 (2:21 pm)
Last year I hit a deer on the front passenger side. After the car was fixed and I picked it up the info center was dark. Initally I thought it wasn't working, but if it's light enough in the car you can still see the numbers and it is reading, it just somehow lost the ability to illuminate. I took off the dash and didn't see where anything is disconected. Anybody experienced this before? Replies to this message: bxd (Aug 23, 2006 5:52 am) momwag (Aug 23, 2006 2:02 pm)
#917 of 980 Re: '99 Grand Prix GT Information Center Display lost illumination/brightness [knepski] by bxd Aug 23, 2006 (5:52 am)
Replying to: knepski (Aug 22, 2006 2:21 pm) I think the illumination for the display is LED based and almost assuredly built into the unit. Not a replaceable bulb really. I would go after the insurance on this if at all possible, it should have been covered.   This is the only piece that lost illumination? Maybe it was coincidence that it went out from the crash. Replies to this message: momwag (Aug 23, 2006 2:02 pm)
#918 of 980 Re: '99 Grand Prix GT Information Center Display lost illumination/brightness [bxd] by momwag Aug 23, 2006 (2:02 pm)
Replying to: bxd (Aug 23, 2006 5:52 am) There is an image adjustment for the HUD that usually helps with ghosting. You might want to see if changing the settings helps. I am not sure if it effects brightness though.
#919 of 980 Re: 2002 Pontiac Grand Prix GTP Fire 11/12/05 [alphy] by dug2171 Aug 29, 2006 (6:05 pm)
Replying to: alphy (Nov 19, 2005 2:24 am) I have a 2000 GTP that started smoking from the dash as I was drove to work several days ago. I pulled over and was able to disconnect the battery after about 10-15 minutes. The car filled with smoke in the meantime. I had the car towed to a dealership that has now told me two wires under the driver seat were exposed and touched. Before I disconnected the battery it burned the wire harness, display harness and the fuse box (and possibly more). I received a quote of $1,600 for parts they have identified and at least a days worth of labor at $85/hour. I have contacted Pontiac who then talked to the dealer who basically told us to cut our losses and buy a new car. I contacted my insurance company who said it is not covered because it was a mechanical failure. Does anyone have a suggestion? Replies to this message: momwag (Aug 30, 2006 12:53 am)
#920 of 980 Re: 2000 Pontiac Grand Prix GTP Fire 11/12/05 [dug2171] by momwag Aug 30, 2006 (12:53 am)
Replying to: dug2171 (Aug 29, 2006 6:05 pm) Unless you can do the work yourself and get the harness from a junk yard you are going to pay more than the car is worth $$ wise. If the car is in good shape and you don't want to buy a new one it may be cheaper overall. How many other electrical components may have been damaged? You won't know until they fix what they know.

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