Ok i dont know where to start. i kept having a prob. w/ fuel pumps after 3 i got one from the dealer and replaced the sensors. took care of the prob. for a while. Then wouldnt start again so i replaced batt and starter worked for a while and now it wont start again. It is turning over fine and then it will just stop for a sec or two like the battery is low but its not. then it will turn fast and almost start then it will do it again. Is it possible that something is holding it back in the motor. I am going to mess around with it tomarrow and see what happens. If anyone has any good idea of something to try or replace. Let me know i am @ the end of my knowledge of what to do. Its got gas,spark,and air. I dont know if its consistant because there is only one of me.
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Re: 1998 suburban wont start consistantly
Get the car going if you can then take it to Advance auto parts or somewhere where they can get a down load of faults from the computer. The intermittant hesitation you describe could be the computer calling for very advanced timing at the wrong time. This easily could be a computer problem
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brake light is prob a bad bulb somewhere , totally seperate from the running problem , get your fuel pressure checked on the fuel rail not sure but should be about 40 50 lbs if not then your fuel pump is prob bad and it is in the tank
If you dont have scanner. You need to check battery voltage, not less than 11v but morethan 12v...then check for starter clicking and engine is carnking then u proceed to check for sparkplug have a current or none. ..if ok then check for fuel pressure..try to on the ignition switch and u can hear a sounds from a fuel pump if no sounds check the fuel pump relay and each electrical. .if it is ok and still not start remove the intake duct and put a little amount of gasoline to the throttle body and this time ur engine will be start smoothly..
If you disconnected the battery to change the fuel pump and did not disable the anti-theft feature first, you now know why it wont start. Check the owners manual if you have it, or contact a GM dealer to get the system reset.
Its called the fuel pump cylinoide which is attached to the fuel pump. Unless the fuel pump is bad, you got an expensive part to buy around $2500 or the cylinoide is $900 whichever is broken. This is a know issue for GMC deisel suburbans 6.5.
A car engine needs 3 things to start. 1. compression 2. a spark 3. fuel
Assuming your engine is ok, you've lost either spark or fuel. Get a can of starting fluid and spray into the throttle body. try to start. if it starts, you're problem is fuel related (clogged filter,fuel pump,relay etc) if it still doesn't start, you've got no spark (coil,module,wiring harness,computer)
I the fuses and relays are good for the pump it could be a bad pump especialy if you was having starting problems make sure you have power to the pump. Also do this before changing pump.
Put your key in turn it on dont start wait 10 mins remove key wait 10 seconds repeat this a total of 3 times. If that dont work try a different key do the same thing. This relearns your key to the ignition it started with Gm cars and trucks from 1999 to to 2006. It is a big problem but there is no recall that I know of. If that dont work a dealer needs to probably replace and reprogram your ignition switch and keys