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Suburban stalls, now won't start.

Tiny
JOHN & EVA
  • MEMBER
  • 2002 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
Can anyone help me with this problem, it just started acting up 2 yrs ago. 2002 Chevy Suburban 5.3 Vortec, Stalling while driving and in hot weather. We replaced the ignition harness and reinstalled it now we get no crank action at all? There is power from the battery just no crank what so ever any ideas?
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Saturday, July 23rd, 2011 AT 1:23 AM

14 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Is it cranking over and will not start or just won't crank over at all/nothing when key is turn to cranking position
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Saturday, July 23rd, 2011 AT 4:06 AM
Tiny
JOHN & EVA
  • MEMBER
  • 15 POSTS
It won't crank over at all, it clicks once and nothing.
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Saturday, July 23rd, 2011 AT 5:44 PM
Tiny
JOHN & EVA
  • MEMBER
  • 15 POSTS
Steering column switch harness was in the run position and needed to be in the start position, the 2003's are set to change in the run position and the 2002 are set in the start position. It starts every time now, now we'll see if the stall problem has been repaired. Thank you
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Saturday, July 23rd, 2011 AT 7:18 PM
Tiny
JOHN & EVA
  • MEMBER
  • 15 POSTS
The truck seems to be a lot better now, it only stalls when you tromp on it for passing gear now, getting closer to a fix I hope. Any idea what we should check? Thank you!
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Saturday, July 23rd, 2011 AT 9:38 PM
Tiny
JOHN & EVA
  • MEMBER
  • 15 POSTS
Well that only fixed the gauges, the stalling is still happening. Was there by any chance a recall on the 5.3?
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Monday, July 25th, 2011 AT 12:33 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and monitor the fuel pressure. Does it start back up easily?
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Monday, July 25th, 2011 AT 12:42 AM
Tiny
JOHN & EVA
  • MEMBER
  • 15 POSTS
No pressure gauge here, and it starts up fine after it sits for a minute after the stalling. John wants to take it in to the garage so they can check the codes, I sure hope that isnt costly :) Thank you for all your help and quick responses, Still researching.
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Monday, July 25th, 2011 AT 2:02 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Could be one of the following below:

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note:If it doesn't apply disregard it and keep testing.
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Monday, July 25th, 2011 AT 8:24 PM
Tiny
JOHN & EVA
  • MEMBER
  • 15 POSTS
He's checked most of that list.
John spoke with the mechanic, he seems to think it's the fuel pump and says he changes them quite a lot on the GM's. He also says it won't pick up a code for a faulty pump. Doesn't sound like it's gonna be a cheap job.
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Monday, July 25th, 2011 AT 9:13 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
One other thing to try if you haven't takenit in as ofyetis to clean the throttleplate with choke cleaner on both sides as well as the iac hole. Also this truck may fall into the category of the fuel pump harness may be bad which the cure is a new pump with a different connector and about a foot of new harness to be spliced in. Also check for soft/broken vacuum lines
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Monday, July 25th, 2011 AT 10:54 PM
Tiny
JOHN & EVA
  • MEMBER
  • 15 POSTS
We went for a drive, almost 2 hours and it didnt stall once, I'm thinking it's a weather issue, it does it on real hot days. I'll be sure to tell him to try that as well Thank you!
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Tuesday, July 26th, 2011 AT 1:51 AM
Tiny
JOHN & EVA
  • MEMBER
  • 15 POSTS
Could it be the evaporation emissions control system? Thank you.
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Tuesday, July 26th, 2011 AT 2:30 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
No it may be a bad craknk or cam sensor or fuel pump getting hot and not working.
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Tuesday, July 26th, 2011 AT 2:09 PM
Tiny
JOHN & EVA
  • MEMBER
  • 15 POSTS
It stopped after awhile, until the next hot day I guess. The new steering harness helped a few of the other issues we were having. Thank you all so much for your help it was greatly appreciated. Eva & John
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Saturday, October 1st, 2011 AT 6:03 AM

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