Help my 1996 GMC Suburban wont Start
11-30-2005, 04:42 PM
#1
Help my 1996 GMC Suburban wont Start Well I am here stuck at work because of this POS!!!Here is the thing The thing just wont start in colder weather.50-60 degree's starts fine but today in 30 degree weather it wont start.Cranks over fine ,I have got spark,The plugs are fairly new Its like it's not even trying to fire!What do you guys think it is.Starts fine in warmer weather but 40 degrees and lower gives me ****.It has been giving me troubles this year since the colder weather,But this time it dont want to start at all.....I hope I have the right forum to post this....Please HELP!!!!
11-30-2005, 07:09 PM
#6
TECH Senior Member
So far you have:
a. 30 degree weather no start.
b. Spark delivered (...did you eyeball this...?).
c. Fuel delivered (smell in exhaust).
d. Fuel smell in exhaust.
Sounds like it may be flooding, possibly due to fuel pressure regulator frozen (or even ruptured, causes flooding also).
What happens if you floor the gas pedal while cranking ("clear flood mode"), does it eventually start and run...?
May be a good idea to check fuel pressure.
a. 30 degree weather no start.
b. Spark delivered (...did you eyeball this...?).
c. Fuel delivered (smell in exhaust).
d. Fuel smell in exhaust.
Sounds like it may be flooding, possibly due to fuel pressure regulator frozen (or even ruptured, causes flooding also).
What happens if you floor the gas pedal while cranking ("clear flood mode"), does it eventually start and run...?
May be a good idea to check fuel pressure.
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11-30-2005, 08:16 PM
#8
Originally Posted by joecar
So far you have:
a. 30 degree weather no start.
b. Spark delivered (...did you eyeball this...?).
c. Fuel delivered (smell in exhaust).
d. Fuel smell in exhaust.
Sounds like it may be flooding, possibly due to fuel pressure regulator frozen (or even ruptured, causes flooding also).
What happens if you floor the gas pedal while cranking ("clear flood mode"), does it eventually start and run...?
May be a good idea to check fuel pressure.
a. 30 degree weather no start.
b. Spark delivered (...did you eyeball this...?).
c. Fuel delivered (smell in exhaust).
d. Fuel smell in exhaust.
Sounds like it may be flooding, possibly due to fuel pressure regulator frozen (or even ruptured, causes flooding also).
What happens if you floor the gas pedal while cranking ("clear flood mode"), does it eventually start and run...?
May be a good idea to check fuel pressure.
b=YES
C=YES
d=I dont know
I tried to hold gas pedal down and no Start will not even try to start
11-30-2005, 08:26 PM
#9
Originally Posted by SUTTERERMAN85
check fuel pressure and if its good unhook a plug wire to make sure you are getting spark ground it to anything metal and get someone to crank it. if no fire it could just be a bad coil and have something to do with the cold.
11-30-2005, 09:24 PM
#14
Yes that is correct,I have spark.I thought that was the problem,I was very surprised to see that.Because it is acting like no spark.When I get to work tomorrow I am going to squirt a few drops of gas down the TB to see what happens. I tried to start it with the gas to the floor ,it does nothing just like not touching the pedal.
12-01-2005, 03:47 PM
#18
TECH Senior Member
When you turn the key to on, you should hear the fuel pump run for 2 seconds (and if you have fuel pressure gauge attached you'll see at least 30 psi or so, and it should hold that pressure).
If you don't hear the fuel pump, you can try:
a. connect fuel pressure guage, this will show if fuel pump runs at key on,
b. check fuel pump fuse (under hood, near fuel pump relay),
c. connect fuel pump test wire (under hood, near fuel pump relay) to battery positive and see if fuel pump runs,
d. reseat or replace fuel pump relay.
If neither of these helps, you have to get out multimeter and see why voltage is not getting to fuel pump.
If you don't hear the fuel pump, you can try:
a. connect fuel pressure guage, this will show if fuel pump runs at key on,
b. check fuel pump fuse (under hood, near fuel pump relay),
c. connect fuel pump test wire (under hood, near fuel pump relay) to battery positive and see if fuel pump runs,
d. reseat or replace fuel pump relay.
If neither of these helps, you have to get out multimeter and see why voltage is not getting to fuel pump.