HELP! Ok i have a 96' GMC Suburban 5.7. trouble starting. 1)When i turn the key the wants to turn over but it is just flooding. 2) When i turn the key and pump the gas pedal it just flooding. 3)when i turn the key and hold the pedal to the floor(not pumping) it tries to turn but takes est. 10-15 seconds and starts. now once its started i can drive anywhere it seems. But when i turn it off same thing all over again to start it. in last 6months i put a new fuel pump and filter in it. someone said it is a cold cranking problem,but i can go out in the cold and hold the pedal to the floor,turn the key and after 10-15 sec of it trying to turn over it will start. just dont why it wont by just turning the key.

220

Asked by Lou1969 Nov 18, 2013 at 11:43 AM about the 1996 GMC Suburban K1500 4WD

Question type: Maintenance & Repair

new fuel pump and fuel filter 6 months ago

7 Answers

68,975

Holding the pedal to the floor puts the engine into what's called clear flood mode, just like with the old carbureted engines it prevents the injectors from opening, sounds like either one of the injectors is stuck open or the fuel pressure regulator diaphragm is ripped and fuel is pouring into the intake

4 people found this helpful.
220

Fixed Problem it was a Coolant Temperature Sensor. Located on front top of block next to the Thermistat. i put a Code Reader on to see if it was showing any codes which it wasnt. So then I started looking at different Data readings it was showing. My wife had ran an errand about 10 minutes before i looked at the Suburban so I knew it would be hot. But the reading for the Coolant said 5 degrees F. Thats what lead me to the Coolant Temperature Sensor. Hope this helps someone.

11 people found this helpful.
68,975

So it was stuck in open loop, odd that it idled fine.

1 people found this helpful.
220

John sorry if i made you think it idled fine, it didnt. it stayed idle once you got it started but it sounded horrible. but thanks for all your help i appreciate it.

1 people found this helpful.
20

Can someone please help. I have a 96 GMC Sierra 1500 with a 5.7 Vortec. It died as if you tuned off the key. So here's what I've done thus far and it still won't start. With a spark tester I checked the plug wire, no spark, with the same tester I checked the coil and coil wire, I have spark at the coil wire,so I replaced the distributor cap and rotor button....the engine still won't start.I have also replaced the crankshaft sensor and the camshaft sensor,spark plugs and wires....now I'm getting some spark to the plugs but its not constant....I returned the cap and rotor and replaced it again and I still have the same issue...

2 people found this helpful.
460

What color is the sparkling. White. Orange or blue. Blue is the best. A ignition coil can go bad from too much cranking of the engine. Also reminder that it's the key switch which sends current from battery to computer to distributor up to ignition coil then to the rotor bear in mind that the sparkplugs must not be dirty. Or your get a no start plus make sure there's a good negative path back to battery check for corodsion at wire ends.

Your Answer:

Suburban

Looking for a Used Suburban in your area?

CarGurus has 39 nationwide Suburban listings and the tools to find you a great deal.

ZIP:

Own this car?

Share your experience with others.

1996 GMC Suburban

Review another car

CarGurus Experts

  • #1
    ShadetreeMech
    Reputation
    1,090
  • #2
    Larry Thibert
    Reputation
    970
  • #3
    DanTheMan5160
    Reputation
    660
View All

Know more, shop wisely

Search

Related Models For Sale

Used Chevrolet Suburban
581 Great Deals out of 12,051 listings starting at $2,588
Used Chevrolet Tahoe
971 Great Deals out of 18,980 listings starting at $2,264
Used GMC Yukon
580 Great Deals out of 10,063 listings starting at $2,900
Used GMC Sierra 1500
1,650 Great Deals out of 55,969 listings starting at $3,995
Used Ford F-150
5,575 Great Deals out of 112,089 listings starting at $1,995
Used Chevrolet Blazer
531 Great Deals out of 17,314 listings starting at $6,500
Used GMC Savana
6 Great Deals out of 233 listings starting at $7,487

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.