1991 Geo Storm

FAULTY ECM CAUSES ERRATIC IDLE SPEEDS. AFTER STARTING, ENGINE RPMS DROP AND ENGINE MAY STALL WITHIN 30 SECONDS EVERY TIME ENGINE IS STARTED. WHILE STOPPED AT LIGHTS OR IDLING, ENGINE WILL OFTEN STALL OUT. ENGINE WILL ALSO OFTEN REV TO OVER 2,000 RPMS. THIS HAS CAUSED VEHICLE TO STRIKE THE REAR OF ANOTHER VEHICLE AT A STOP. THIS PROBLEM REPORTEDLY OCCURS DUE TO MALFUNCTION IN ECU DUE TO SHRINKAGE OF THE INSULATION USED ON IT.

THE PROBLEM IS THAT BETWEEN 1985 AND 1995, AC DELCO USED A INSULATIVE SPRAY ON THE CIRCUIT BOARDS IN THESE ECUS/COMPUTERS WHICH SHRINKS OVER TIME WHEN EXPOSED TO WARM AND COOL TEMPERATURE CONDITIONS, SUCH AS THE NORMAL CONDITIONS THAT AN AUTOMOBILE IS SUBJECTED TO. THE SHRINKING INSULATIVE SPRAY CONTRACTS AND PULLS THE ELECTRONIC COMPONENTS FROM THE CIRCUIT BOARD, BREAKING SOLDER CONNECTIONS AND CAUSING SHORTS. *AK

THE FIRST ECU WENT WHEN I WAS SITTING IN MY DRIVEWAY THE RPMS WERE ERRATIC I GOT IT FIXED, ORDERED A NEW ECU COST ME $950. IT LASTED NO MORE THAN 3 MONTHS AND THE SAME PROBLEM DEVELOPED ON THE NEW ONE. I DO NOT WANT TO KEEP SPENDING ALMOST $1000 EVERY THREE MONTHS. I ALSO DON'T WANT TO SELL THE CAR AND HAVE THE NEW OWNER HAVE THE SAME PROBLEMS. I HAVE CONTACTED ISUZU, AND GM. ISUZU SAID "THEY DO NOT MAKE CARS CAN'T HELP YOU" GM SAID ALMOST THE SAME THING "THATS COMMON" BUT YET THEY HAVE SWITCHED TO A NEW METHOD OF MAKING ECU'S/ECM'S.. PLEASE LOOK INTO THIS. *AK

THE PROBLEM I HAVE BEEN EXPERIENCING WITH MY 1991 GEO STORM GSI, IS EVERYTIME I'M AT A RED-LIGHT OR STOP SIGN WITH THE CAR AT A COMPLETE STOP, MY IDLE WILL SHOOT UP FROM THE NORMAL 800-900 RPMS, TO 2,000-3,000 RPMS. THIS IS VERY DANGEROUS ON A AUTOMATIC TRANSMISSION EQUIPPED STORM, SINCE YOU HAVE TO FIRMLY PRESS ON THE BRAKE PEDAL VERY HARD TO PREVENT THE CAR FROM LURKING FORWARD AND HITTING A CAR IN FRONT OF YOU, OR INJURING OR EVEN KILLING A WALKING PEDESTRIAN THAT HAPPENS TO BE CROSSING THE STREET. IT IS ALSO A HAZARD FOR MANUAL TRANSMISSION CARS BECAUSE ENGAGING THE ENGINE AT 2,000-3,000 RPM WILL RESULT IN VIOLENT FORWARD MOTION. EXAMPLE: YOU ARE PULLED UP TO A STOPLIGHT AND YOUR FOOT ACCIDENTALLY SLIPS OFF THE CLUTCH PEDAL. IF YOUR CAR IS IDLING CORRECTLY AT 800 RPM, THE CAR MOVES A FOOT FORWARD AND THE ENGINE DIES, BUT IF THE VEHICLE IS IDILING AT 2,000-3,000 RPMS, THE VEHICLE WILL LAUCH FORWARD LIKE A ROCKET. SCENARIO TWO, THE ENGINE IS HOVERING AT 2,000 RPM, UNCONTROLLABLY, AND YOUR FOOT SLIPS OFF THE CLUTCH PEDAL. YOUR CAR BOLTS FORWARD RUNNING OVER THE PEDESTRIAN WHO HAPPENED TO BE CROSSING IN THE CROSSWALK. THIS IS A PROBLEM THAT MANY GEO STORM OWNERS HAVE, BUT HAVE HAD NO LUCK IN TRYING TO SOLVE THE PROBLEM WITH GENERAL MOTORS. THE PROBLEM, FROM WHAT A SPECIALIZED MECHANIC TOLD ME, COULD BE THE ECM OTHERWISE KNOWN AS THE "ENGINE CONTROL MODULE" WHICH IS THE ENGINE COMPUTER. ANY HELP IS GREATLY APPRECIATED, AS WE VERY MUCH NEED IT AT THIS TIME FOR OUR SAFETY, AND THE SAFETY OF OTHERS. THANKS, EDUARDO ZABALLA. *AK( DOT NUMBER: TIRE SIZE: P205/50/15 )