Starts but won't run

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Starts but won't run - 3/10/2008 3:00:47 PM    1955chevyhams   Posts: 5 Joined: 8/11/2007 Status: offline Vitals: 2000 Blazer, 4.3l, 4x4, 121,000 miles. Problem: When I go to start the car it will start but immediately die. It starts immediately like you'd expect but shuts off just as fast, almost like I'm turning the key off (which I stupidly told my wife she was doing when this first happened a few weeks ago).  I can hear the fuel pump run up to pressure and shut off. It started up and ran just fine this morning. I haven't scanned it yet. Any ideas?  Post #: 1

RE: Starts but won't run - 3/10/2008 3:05:30 PM    rriddle3 Posts: 1339 Joined: 12/22/2006 From: Fort Worth,Texas Status: offline Let's start by checking the fuel pressue. The directions are here in this thread. < Message edited by rriddle3 -- 3/10/2008 3:10:56 PM > _____________________________ 2002 Blazer LS 4dr 2WD Auto Trans Hypertech PP III Programmed Flowmaster 50 Series Delta Flow Muffler, C6 Corvette Exhaust Tip TYC Elegante carbon fiber tail lights (in reply to 1955chevyhams) Post #: 2

RE: Starts but won't run - 3/10/2008 6:03:19 PM    swartlkk Posts: 14530 Joined: 5/1/2005 From: Waterloo, NY Status: offline Have you noticed the security light coming on at all? _____________________________ Kyle- 04 Rainier My Restoration Projects Please Do Not PM for Tech Help (in reply to rriddle3) Post #: 3

RE: Starts but won't run - 3/11/2008 12:50:50 AM    thegr81 Posts: 2621 Joined: 1/16/2007 From: PHOENIX,AZ Status: offline It sounds like the symptoms of a chipped key not being used to start the vehicle!! Hence what kyle said. _____________________________ 2001 2wd 4.3 vortec v6 "I'm not fat, I'm a minitrucker" (in reply to swartlkk) Post #: 4

RE: Starts but won't run - 3/11/2008 12:56:19 AM    Taymacjack Posts: 518 Joined: 7/18/2007 From: Auschwitz, Oregon Status: offline yeah chipped key what gr81 said....didnt really need to post this though... _____________________________ 1995 GMC Jimmy 4x4X2 (I need a outside spare tire carrier...wanna trade for the inside version?) (in reply to thegr81) Post #: 5

RE: Starts but won't run - 3/11/2008 1:00:03 AM    WolfPack Posts: 2844 Joined: 10/30/2007 From: Raleigh, NC Status: offline It would appear to be a problem with the Passlock system. Probably because your key isn't chipped.  Or your ignition switch has failed (mine is in process...does this every so often..pretty much whenever I'm in a hurry). _____________________________ 2000 Blazer 4d LS 4x4 - 265/70/15 General Grabber AT2s - Hunter Brush Guard - Surco Roof Rack with IPF 868s - 1.5'' Shackle + Tbar - 2'' BL (in reply to Taymacjack) Post #: 6

RE: Starts but won't run - 3/11/2008 1:11:54 AM    thegr81 Posts: 2621 Joined: 1/16/2007 From: PHOENIX,AZ Status: offline I was trying to rule something out on that!! My 99 nissan maxima was like that if I tried using the spare key without the chip in it!! Also I drew a blank on the name of the system you mentioned(passlock system) that is more likely what is happening in this case!! _____________________________ 2001 2wd 4.3 vortec v6 "I'm not fat, I'm a minitrucker" (in reply to WolfPack) Post #: 7

RE: Starts but won't run - 3/11/2008 4:43:12 AM    swartlkk Posts: 14530 Joined: 5/1/2005 From: Waterloo, NY Status: offline quote: ORIGINAL: thegr81 It sounds like the symptoms of a chipped key not being used to start the vehicle!! Hence what kyle said. Gee thanks for reiterating what I said...  Too bad - no chip...  We really need the OP to respond before speculating further. < Message edited by swartlkk -- 3/11/2008 4:54:52 AM > _____________________________ Kyle- 04 Rainier My Restoration Projects Please Do Not PM for Tech Help (in reply to thegr81) Post #: 8

RE: Starts but won't run - 3/11/2008 9:51:01 AM    1955chevyhams   Posts: 5 Joined: 8/11/2007 Status: offline I thought maybe the thread had started a life of its own! OK: Check fuel pressure - 60.1 lbs when the pump goes off. No leakdown to speak of. No chip in this system....plain old fashioned key.  The ignition switch idea has merit.  My 55 had that issue once. It has started and ran fine ever since the last episode. (in reply to 1955chevyhams) Post #: 9

RE: Starts but won't run - 3/11/2008 1:51:24 PM    swartlkk Posts: 14530 Joined: 5/1/2005 From: Waterloo, NY Status: offline Have you noticed the 'Security' light coming on at odd times or staying illuminated after you attempt to start the truck?  If so, I would definitely say that you have a problem with the ignition switch.  This kind of problem can come and go, potentially leaving you stranded in the most inopportune time. _____________________________ Kyle- 04 Rainier My Restoration Projects Please Do Not PM for Tech Help (in reply to 1955chevyhams) Post #: 10

RE: Starts but won't run - 3/11/2008 9:15:42 PM    1955chevyhams   Posts: 5 Joined: 8/11/2007 Status: offline The security light doesn't come on except during the normal start-up. I had something happen a few years ago when the starter wouldn't crank at all using the key. Having grown up on tempermental starter soleniods I did the old reach through the dust shield with a screw driver and jump the battery lead to the solenoid terminal trick and it started. I'm beginning to circle around to a bad switch.  How hard is it to replace?? (in reply to 1955chevyhams) Post #: 11

RE: Starts but won't run - 3/11/2008 10:03:34 PM    swartlkk Posts: 14530 Joined: 5/1/2005 From: Waterloo, NY Status: offline The ignition switch is relatively easy.  Here is the book method: Ignition Switch Replacement - Book Method... From what I remember of the few replacements I have done, you basically unbolt the kick panel under the dash & remove it.  Remove the upper and lower shroud off of the steering column.  Disconnect the main wiring harness.  Remove it from the clip and then remove the individual connectors from the main center connector.  You will then remove the other electrical connectors on the old ignition switch and remove it from the column.  _____________________________ Kyle- 04 Rainier My Restoration Projects Please Do Not PM for Tech Help (in reply to 1955chevyhams) Post #: 12

RE: Starts but won''t run - 9/11/2008 2:53:05 PM    Sailor   Posts: 4 Joined: 9/9/2008 Status: offline I had this exact same confounding issue with my 2001 Blazer. Check the fuse marked TBC Truck Boby Computer. Its located in the engine compartment fuse box right hand side. Fixed my problem immediately. It seemed incongruous but this blown TBC fuse effected other componants as well like the interior lights, engine compartment light, driver''s side door lock. The engine would fire on one or two cylenders and then imediately shut down. I had the steering column shrouds all off ready to do battle with the ignition switch when I traced the fault to this fuse. Good Luck (in reply to swartlkk) Post #: 13

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