1997 Chevy Suburban CUTTING OUT

Tiny
TOWBEAR
  • MEMBER
  • 1997 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
THIS JUST STARTED NOT TO LONG AGO, BUT IS VERY INTERMITANT, THE ENGINE WILL JERK AND THEN ACT LIKE ITS NOT GETTING FUEL OR SPARK CANT TELL WHICH WE UNPLUGGED THE EGR THINKING THAT IS WAS THE PROBLEM AS IT CAME UP IN THE CODES, IT RAN GREAT FOR AWHILE NO PROBLEMS. I HAVE CHANGED THE IGNTION MODUAL THE SPARK PLUGS THE FUEL FILTER AND WIRES, IT WAS RUNNING GREAT UNTIL I DID THAT AND THE THE STALLING AND WONT START ISSUE HAPPENED AGAIN IT WILL DIE BUT MOST OF THE TIME WILL START RIGHT BACK UP I AM AT A LOSS. I WAS TOLD MAYBE THE CATALITIC CONVERTER MAY CLOGGED BUT MY MECHANIC SAID HE DIDNT BELIVE IT WAS BECAUSE ONE THIER IS STILL EXAUHST COMING FROM THE TAIL PIPE AND THE CONVERTERS ARNT GLOWING RED. I AM AT SUCH A LOSS AND WE ARE TO TAKE A BIG TRIP IN3 MONTHS
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Monday, March 2nd, 2009 AT 6:28 PM

7 Replies

Tiny
RACEFAN966
  • EXPERT
Ok I dont think it is a cat either as they don't behave that way when they go bad. Now how long ago was the tune up done? What cap did you use? Was it a brass tip or aluminum tip? According to the service bulitens on this style of cap you are not to use a brass tip cap you should use one with aluminum tips. Also check to make sure that the cap and rotor are on tight and didn't loosen up. Get back to me and we will go from there.
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Monday, March 2nd, 2009 AT 7:40 PM
Tiny
TOWBEAR
  • MEMBER
THE CAP AND ROTOR WERE A WEEK AGO AND THE REST DONE TODAY IT WAS AN ALUMINUM TIP AND EVERYTHING WAS TIGHT COULD IT AT ALL POSSIBLE BE THE FUEL PUMP ACTING LIKE THAT IN SUCH A WIERD WAY? GOING FINE GOING FINE JERK JERK THEN NOTHING STEP ON THE GAS NO RPMS CRANK CRANK NOTHING PULL OVER LET IT SIT FOR A FEW STARTS UP RUNS GREAT FOR X AMOUNT OF TIME AND THEN STARTS AGAIN AND NOW THAT I THINK ABOUT IT IT IS WHEN IT IS ABOUT 3/4 OR LESS
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Monday, March 2nd, 2009 AT 7:47 PM
Tiny
RACEFAN966
  • EXPERT
Have you replaced the fuel filter anytime recent? Yea it could be a fuel pump but lets not just replace it ok. Get back to me
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Monday, March 2nd, 2009 AT 7:59 PM
Tiny
TOWBEAR
  • MEMBER
YES TODAY WITH THE PLUGS AND WIRES THATS WHEN IT STARTED ACTING UP AGAIN SO MY MECHANIC CAME OUT AND CHECKED EVERYTHING ALL WAS TIGHT AND ON CORECT AND WORKING BUT HAD NO IDEA WHAT WAS GOING ON BECAUSE LIKE I SAID IT IS SO INTERMITANT. HE SUGESTED THAT IT MIGHT BE THE FUEL PUMP BUT COULDNT CHECK IT TODAY IT GOT US HOME WITH NO PROBLEMS I TAKE THAT BACK IT STALLED ONCE BUT STARTED RIGHT BACK UP
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Monday, March 2nd, 2009 AT 8:22 PM
Tiny
RACEFAN966
  • EXPERT
Ok when it stall is when you need to do a fuel pressure test to determine if the fuel pump is causing this. If you get this get back to me with the fuel pressure. The fuel pressure needs to be 60-66 psi to start and should be 55 psi running. Now has anyone check the fuel lines under the upper plenum. These can brake and cause this problem too or the fuel pressure regulator. Now they make a fuel line repair kit if the fuel lines cracked under the plenum and they also make a pressure regulator too. If the fuel lines are cracked you will only find out by pulling the upper plenum half off and where the fuel lines hookup to it, it will be very clean around there and you may have a little fuel puddled up maybe not. Let me know what you find.
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Tuesday, March 3rd, 2009 AT 10:41 AM
Tiny
TOWBEAR
  • MEMBER
THANK YOU FOR ALL YOUR HELP HERE IS WHAT WE HAVE FOUND TO BE THE PROBLEM SO FAR: THE FULE PUMP WAS WORKING JUST FINE, THE MECHANIC ACTUAL GOT THE VEHICLE TO REPRODUCE WHAT WAS GOING ON THE COIL WAS MISSFIRING OUT THE THE SIDE SO BAD COIL THEN THE WIREINHARNESS TO THE COIL WIRE WAS ALSO BAD. SO IT LOOKS LIKE WERE GOOD TO GO. I THANK YOU FOR ALL YOUR HELP AND PATIENCE.
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Tuesday, March 3rd, 2009 AT 1:56 PM
Tiny
RACEFAN966
  • EXPERT
Geat glad it was found. Sometimes the only way to find it is for it to happen. If there is anything else just ask. I will do what I can.
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Wednesday, March 4th, 2009 AT 11:08 AM

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