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The problem may be caused by a variety of reasons - the plugs may require replacement, fuel system may require cleaning or other hardware defects, including poor fuel pressure as advised before (though, this is probably unlikely as you'd have some lights on on the dashboard in such case). Most of problems can be diagnosed electronically (i.e. without having to get into the engine compartment) - try getting to a dealer or a good electric mechanic.

Sounds like you are losing fuel pressure. Try turning the key on for about 5 seconds then off without going to the start position. Do this a couple of times, then see if it starts right up. When you first turn the key on, the fuel pump starts running. If the system is not keeping pressure when it's off, it will take a bit of time to build that pressure up. If you go to start immediately, it might not run. You can prove if this is what is happening by turning the key on and off a couple of times to let the pump build pressure. The pump will not keep running for more than a few seconds if it does not detect a start. That's why you have to cycle the key a couple of times to build pressure.

My dash is completely out except when I start my car. The pointers flicker and all of the sensor lights light up but I have no idea how much gas I have or how fast I am going..(not good for a girl with a bit of a lead foot). I have a '93 LS that I love but don't want to spend thousands to repair the dash. I am in the Indianapolis area if you know of anyone here, but I would also love to have the info on repairing it. I can get a friend to help me. Thank you soooo much!!!! My email is misshooty2004@yahoo.com Hi, do you know where to get those two oval shaped flourescent bulbs that go in the instrument cluster to light up the speedometer and tach gauge? My dash is completely out except when I start my car. The pointers flicker and all of the sensor lights light up but I have no idea how much gas I have or how fast I am going..(not good for a girl with a bit of a lead foot). I have a '93 LS that I love but don't want to spend thousands to repair the dash. I am in the Indianapolis area if you know of anyone here, but I would also love to have the info on repairing it. I can get a friend to help me. Thank you soooo much!!!! My email is misshooty2004@yahoo.com Hi, do you know where to get those two oval shaped flourescent bulbs that go in the instrument cluster to light up the speedometer and tach gauge? Yes, I have those oval lights, but chances are they are not bad. There are other reasons for those not to light up. Email me directly so I can send the info. jimlwalker@sbcglobal.net

Here is a guide to help you figure out what Generation Nav you have, I do not have the Toyota info. Check the DVD version on your car to see what DVD version you have. Gen 1 Hard Drive based LS400.................98-2000 GS400................98-2000 GS300................98-2000 Gen 2 and 3 DVD based, 5.1 update disc P/N 00230-GEN23CY-05 LS430.................2001-2003 GS430................2001-2005 GS300................2001-2005 ES300/330..........2002-2003 RX300/330..........2001-2004 LX470.................2001-2003 IS300..................2002-2005 SC430................2002-2004 GX470................2003-2004 Gen 4 DVD based, 5.1 update disc P/N 00230-GEN4S-CY05 , Numbers on the DVD are: 86271-33045 & 464210-0660 LS430..................2004-2006 GS430.................2006 GS300.................2006 ES330.................2004-2006 RX330.................2005-2006 RX400h...............2006 LX470..................2004-2006 SC430.................2005 -2006 GX470.................2005-2006 Gen 5 DVD based IS250/350 ..........2006

For those that don't know how the GPS override is done. This works for Gen 3 version 3.1 1. With car on, in PARK or fully stopped, press MENU. 2. Press DVD (upper right corner) 3. There are hidden buttons on this screen. Use the fat part of you index finger not the tip for best results. In order press a. Upper Left Corner b. Lower Left Corner c. Upper Left Corner d. Lower Left Corner e. Lower Right Corner 4. You should now see a screen with 2 columns of 4 buttons. Locate the GPS button 5. Press and hold for 5 seconds. It will beep one and then turn green 6. Press the BACK button in upper right hand corner 7. Now you can use all the NAV functions while in motion. When you turn the car off the NAV will reset to normal and you will have to do this procedure again when you restart the car. For Gen 4, version 4.2: 1. With car on, in PARK or fully stopped, press MENU. 2. Goto the menu that controls volume functions 3. There are hidden buttons on this screen. Use the fat part of you index finger not the tip for best results. In order press a. Upper Left Corner b. Lower Left Corner c. Upper Left Corner d. Lower Left Corner 4. You should now see a screen with 2 columns of 4 buttons. Locate the GPS button 5. Press and hold for 5 seconds. It will beep one and then turn green 6. Press the BACK button in upper right hand corner 7. Now you can use all the NAV functions while in motion. When you turn the car off the NAV will reset to normal and you will have to do this procedure again when you restart the car.