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1dodge1mopar
User
Oct 17, 2009, 5:15 PM
Post #1 of 8
(4229 views)
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I HAVE A '93 BLAZER S-10 WITH THE "Z" (MFI) 4.3. IT IS A TRANSPLANT FROM A SALVAGE YARD AND HAS GIVEN ME MANY MILES OF QUALITY SERVICE.
HERE IN THE PAST WEEK IT HAS STARTED RUNNING "ROUGH" AT IDLE AND NOT ACCELERATING SMOOTHLY AS IN THE PAST. I NOTICED TODAY WHEN I "FLOOR" IT, IT GETS TO ABOUT 70 MPH , WANTS TO "KICKDOWN" AND STARTS BACKFIRING/CUTTING OUT.
I RAN A SELF-TEST AND GOT A DTC OF "23". ACCORDING TO MY CHILTON 28160 MANUAL, THERE IS NO "23" CODE FOR THE "93 PCM EQUIPED VEHICLES"-JUST A 22 (THROTTLE POSITION SENSOR...) AND A "24" (VEHICLE SPEED SENSOR). THE '88-92 ENGINES (EXCEPT MFI-TURBO) SECTION GIVES A "23" CODE="MAT-LOW TEMPERATURE INDICATION"
THE SECTION ON "THROTTLE POSITION" SENSOR AND RELATED DIAGNOSIS AND PROBLEMS SEEMS TO RELATE MORE TO MY PROBLEM THAN ANYTHING.
I DON'T HAVE THE MONEY OR PROPER TOOLS TO DO/HAVE DONE A COMPUTER SCAN OF THE PROBLEM. I AM UNEMPLOYED AND NO UNEMP. $$ COMING IN AT THE MOMENT.
I HAVE REPLACED THE ROTOR/DISTRIBUTOR CAP SINCE I HAD PROBLEMS LIKE THIS ON THE FIRST ENGINE AND THAT SOLVED THE "ROUGH" PERFORMANCE. THIS TIME, NO LUCK.
CAN ANYONE OUT THERE GIVE ME SOME ADVICE ON WHERE TO START, ON WHAT TO TROUBLESHOOT AND/OR WHAT TO "CHEAPLY" REPLACE TO SOLVE MY DILEMA.
THANX FOR LISTENING.
ED BASS
BOONE, IOWA
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 17, 2009, 5:25 PM
Post #2 of 8
(4225 views)
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CODE 23 - Intake Air Temperature (IAT) Sensor Circuit (Low Temp.)(PCM & CMFI Only)
There is a question as to whether that code applies to your vehicle. I would check it again to make sure.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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1dodge1mopar
User
Oct 17, 2009, 5:35 PM
Post #3 of 8
(4219 views)
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THE ONBOARD SELF-DIAGNOSIS TEST (A+B), GIVES A 2-PULSE+3PULSE INDICATION FOLLOWED WITH THREE 1-2 PULSES, ENDING THE TEST.
ONCE AGAIN, MY CHILTON MANUAL DOESN'T LIST THIS CODE (23) FOR THE YR OF MY BLAZER ('93 4.3 MFI). THE ECM, AS FAR AS I KNOW IS THE ORIGINAL ECM. IF THIS WERE A '92 MFI TRANSPLANT, WOULD A '93 ECM RECOGNIZE A 23 PROBLEM AND DISPLAY IN A DIAGNOSIS?
PLEASE ADVIZE. WHAT SHOULD I DO TO CORRECT THE PROBLEM?
THANX FOR LISTENING.
ED BASS
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 17, 2009, 5:39 PM
Post #4 of 8
(4216 views)
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Look and see if the engine has an IAT and check it out for obvious problems. It could be unplugged or a bad sensor.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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1dodge1mopar
User
Oct 17, 2009, 7:18 PM
Post #5 of 8
(4210 views)
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SORRY TO KEEP BOTHERING YOU.
ONE THING I NOTICED AFTER MAKING SOME CHECKS OF WIRING, HOSES, ETC.AND TAKING IT FOR A TEST RUN-I LOST POWER BRAKES.
I CHECKED THE LARGE HOSE GOING TO THE MASTER CYLINDER AND IT LOOKS IN GOOD SHAPE AND CONNECTED. THIS ACTS LIKE A MAJOR VACUMN PROBLEM-HIGH SPEED + POWER BRAKE FAILURE.
ANY SUGGESTIONS OTHER THAN THE IAT?
THANX
ED BASS
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 17, 2009, 7:20 PM
Post #6 of 8
(4207 views)
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Just the obvious one.......look for a vacuum leak.
Take a vacuum reading with a gauge to determine if you have full vacuum or not
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Oct 17, 2009, 7:20 PM)
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1dodge1mopar
User
Oct 17, 2009, 9:06 PM
Post #7 of 8
(4199 views)
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QUICK UPDATE:
WITH IGN ON, I RAN A VOLTAGE BACKPROBE ON THE TPS. ACCORDING TO CHILTON, VOLTAGE SHOULD BE 1.25 V OR LESS-THROTTLE CLOSED. SLOWLY OPENING THE THROTTLE, ACCORDING TO CHILTON, THE VOLTAGE SHOULD SLOWLY RISE TO ABOUT 4.5 V. CHILTON STATES TO REPLACE IF THESE READINGS AREN'T FOUND.
ACCORDING TO MY FINDINGS, USING A MULTIMETER WITH A 12.1 BATTERY VOLTAGE CHECK, THE READINGS I OBTAINED WERE 00.0 THROUGHOUT THE WHOLE TEST.
I WILL TRY A NEW TPS AND SEE IF THAT SOLVES THE PROBLEM.
DO YOU AGREE?
THANX AGAIN FOR YOUR TIME.
ED BASS
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 18, 2009, 4:58 AM
Post #8 of 8
(4197 views)
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That would be correct if I'm assuming you had the key on, tested the right wire, used the circuit ground for testing and verified 5v coming in also.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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