it is a 96 tahoe, 5.7 l v8. sometimes it starts great other times it wont start at all. i replaced the fuel pump module and the fuel filter. the first day it was great . the next back to having trouble.turns over hard but just wont start. i try cranking it until i finally drain the battery and have to jump start it. soon as i hook up the cables it instantly starts up. why does this happen and how can i fix it?
Chevrolet Q&AAsk Your Question
1995 Chevrolet Tahoe Question: why does my 96 tahoe turn over good but it will not start?
Answer #1pushrod December 09, 2012, 22:49Master
When it dont start up need to check fuel press. and ignition fire. Bet you dont have one or the other or both.
Can you hear the pump run when it is not starting? Crank, let off key but leave it on, does pump run a couple of seconds?
Can repeat this as many times as needed to see if pump is working. If that is ok check ignition fire
if that is ok injector pulse should be too, start engine and drive away. I assume you can do this as you said,
"I replaced fuel pump module and filter".
Replygoodguy, December 10, 2012, 01:39Master
I agree with wetry
Replychevymain, December 10, 2012, 03:14Rookie
thats why i replaced the pump to begin with because it wasn't coming on when i turned the key. prior to that it would come on every once in a while then just quit coming on. now that i replaced it the first day yes it was coming on and cranking just fine thought the problem was fixed. last night i turned the key, pump came on it tried to crank shook a little and died tried again but pump never would come back on no matter how many times i turned the key back and forth.
Replypushrod, December 10, 2012, 03:32Master
Well you should know what to do then. If the pump aint working. Check for voltage at the pump if present replace it again!
Good luck! and Good day.
Replychevymain, December 10, 2012, 04:45Rookie
i checked the fuel pump relay and it is bad. there is a spot that has gotten hot and melted a little. if i replace it could there be something that caused that one to over heat that i might need to check. dont want to replace it and that happen to the new one.
Replygoodguy, December 10, 2012, 05:17Master
the old fuel pump could have shortsd out the relay
Replychevymain, December 10, 2012, 06:40Rookie
Answer #2Greg's Orange Auto (11856 Answers) , Orange, CA - (714) 361-9386globalhelper December 10, 2012, 06:40Master
have fuel pressure tested,it may be on the low side of spec's