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Chevrolet Repair/Limp mode....?

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The Burb
The Burb  
I have a 2003 Suburban 1500 LT 4x4, has approximately 150 k miles.  My cats were stolen off my truck 2 months ago. Before I knew this happened I was driving and thought my tranny went out. No slipping p Dior, no issues Im aware of. Then I find out what happened. I had universal cats installed. I remained in limp mode, only getting 2nd then taking OD off for 3rd. I did a tranny fluid and filter change. Added the SeaFoam transmission cleaner as well as the Chevron with Techron fuel additive as I usually do few times a year. Seemed to bea little better I was able to get 3rd by manipulating gas pedal a bit, can't press too hard orbit just winds, then getting up to 4th w OD off.  I had to redo the filter /tranny fluid after a few days, the SeaFoam worked great.... I threw codes after the cats were put back on 137 & 157, but have no check engine light currently.Today I replaced the 02 sensors, checked all the solenoids when changing fluid, all was fine. So now , Im told, after having these types of codes, I have to do a OBD II drive cycle.... I'm preparing to do this tomorrow. But ultimately if all this doesn't work Im expecting the 3-4 went out and has to be replaced...? But then why would Iget either gears at all...?  Any suggestions WOULD BE GREATLY APPRECIATED! Oh, I did go thru throttle body, and Im checking the MAF sensor tomorrow.

Andrea

Answer
GOOD MORN ANDREA, YOUR CATS WERE STOLEN OFF YOUR TRUCK..WOW, THATS BAD...THAT HAD TO BE LOUD...
IT SOUNDS TO ME LIKE THE VALVE BODY SOLENOIDS ARE STICKING OR NOT RECEIVING THE SIGNAL TO WORK.OR THE CLUTCHES ARE BAD . YOU SAY YOU CHECKED THE SOLENOIDS..HOW DID YOU CK THEM ??? DID YOU CHECK FOR SIGNAL FROM THE PCM TO SEE IF IT WAS GETTING SIGNAL ??? THE WAY WE CHECK IS HOOK UP OUR SCAN TOOL AND SEND A SIGNAL TO THE SOLENOID AND SEE IF IT GETS THERE,POSS SHORT,BAD PCM OR BAD SOLENOID..BUT YOU CAN NOT GUESS. SO IF YOU DO NOT HAVE A SCAN TOOL TO CK THIS IS ITS JUST A GUESS. IAM NOT SAYING YOUR ARE WRONG ON YOUR HUNCH,YOU MAY NEED TO HVE THE TRANS REBUILT,BUT LETS BE SURE FIRST..I DO NOT KNOW WHY YOU ARE GOING THROUGH THE THROTTLE BODY OR CHECKING THE MAF ????I HOPE I ANSWERED THIS OK FOR YOU,BUT THIS IS VAGUE, IF YOU NEED MORE INFO GET BACK TO ME. GOOD LUCK TO YOU,, TOM...

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TOM SHEETS

Expertise

PLEASE READ ALL OF THIS BEFORE ASKING ANY QUESTIONS. IF THIS CHEVY SECTION IS MAXED OUT.YOU CAN REACH ME IN THE OLDS/BUICK SECTION. Will answer questions from 6:00am to 10:00pm all days [EST][[[ NO DIESEL OR PAINT QUESTIONS]]] will answer all 1965 to present QUESTIONS ON ALL GM'S on mechanics of these cars. Keep in mind i am not there in person i am going on what you are telling me !! PLEASE IF ASKING A QUESTION GIVE ME AS MUCH INFO AS POSSIBLE. THE MORE THE BETTER. SUCH AS YEAR,MAKE,MODEL,ENGINE SIZE. THIS WILL HELP ME HELP YOU. I will not be able to answer all questions because of some situations that i would really need to be there and see things for myself,such as electrical issues. In many cases i would need wiring diagrams. I can also give you an estimate on what the cost would be at our repair shop as an idea to help you. Keep in mind that my answer is ONLY MY ADVICE,ck with your mechanic as well.. >> THANK YOU, TOM..

Experience

I have been a ASE certified master mechanic for over 30 years and certified IN ALL 8 CATEGORIES,[engine repair,engine performance,auto trans,manual trans,clutches,steering and suspension,brakes,electrical systems,heating and air/cond. I am also a state CERTIFIED inspector for over 30 years. I do computer work [pcm]fault codes,pcm flashing,state inspection monitor readiness,repairs on exhaust,fuel service,[injection and carburetor,] charging system problems, running issues,alignments,frame problems,tire balance,struts and of course standard and anti-lock brakes.

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nys state auto repair industry and ase group.

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Education/Credentials
high school,4 years of tech school,and many many hours of auto training with many gm classes and aftermarket training classes..

Awards and Honors
ASE MASTER TECH CERTIFIED IN ALL 8 CATEGORIES.NYS INSP LICENSE AND A/C CERTIFIED

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MANY CUSTOMERS IN OUR BUSY SHOP.

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