Ecotec Has Unique Ignition System
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From: sonora California
help!
Yes indeed there is. On most cars there is a camshaft position sensor and a corresponding "device" on the cam to create a signal to tell the ECU what the valves are doing in relation to the crankshaft so it can detect what cylinder to put spark to properly. On the Ecotec there is no sensor. It is done through electrical feedback. There are sensors built into the IDI unit that take readings for cylinders 1 and 3 to detect which one has fired on it's compression stroke. It then matches the fuel injection up to the proper cylinder in the sequence.
Page 6-477 in the GM Service Manual, if you have access, describes the setup in detail in realtion to DTC P0340. Any other particulars you need let me know.
Page 6-477 in the GM Service Manual, if you have access, describes the setup in detail in realtion to DTC P0340. Any other particulars you need let me know.
YOU EXPLAINED THAT EXTREMLY WELL ! AN I APPRECIATE YO
UR KNOWLEDGE!
I'M WONDERING IF MAYBE YOU COULD SHED SOME MORE LIGHT ON THIS P0340 ON MY COBALT!? AS I'M JUST BOUT TI PUSH IT OFF A CLIFF !
SO.. IVE BEEN FOOLING WITH RHIS CAR FOR 2 MINTHS NOW REPLACING PARTS.. FAILING SMOG CHECKS ETC
SO I HAD REPLACED THE ICM WITH ONE FRIM THE DEALER.. AS THAT WAS THE ADVICE FROM A MECHANIC. I KNOW )HE LIVES IN A DIFFERENT STATE) SAN BEFORE THAT I REPLACED THE CRANK SHAFT SENSOR..PURGE VALVE PLUGS WIRES..ETC.. ENGINE LIGHT WENT OFF AFTER THE NEW AC DELCO ICM.. BUT DUDNT LAST FOR LONG.. CAME BACK ON.. THEN AFTEE A FEW TIMES OF STARTUNG IT.. IT FINALLY JUST QUIT IDLING.
SO IT SAT A MINUTE.
THEN I PUT THE OLD ICM BACK IN IT.. AN TO MY SURPRISE.. IT IDLED.. AN STILL DOES.. I BOUGHT A CAM SHAFT SENSOR FOR IT.. AN RGE ENGINE LIGHT KEEPS INSISTING IT HAS ONE.
AN IVE SEEN AN READ THAT IT DOES HAVE ONE.. BUT LOOKED IN THOSE PLACES THEY DESCRIBED.. AN HAVNT FOUND IT YET .
WHAT I DONT UNDERSTAND IS WHY WOULD IT KEEP THROWING THE CODE (THAT IT HAA ONE) IF THIS MOTOR DOESNT HAVE ONE ?!
AN MY BIGGEST QUESTION.. . IS. I HAVE 5 DAYS OR LESS TO GET THIS CAR SMOGGED -YET I'M STUCK CONFUSED..AT MY WITS END. AN DONT KNOW WHAT TO DO ! AFTEE PUTTING A GRAND INTO IT... I CANT AFFORD TO TAKE IT TO A MECHANIC EITHER!!
IF U HAVE ANY IDEAS..THOUGHTS.. ADVICE..
I'D BE MORE THAN THANKFUL!
(note... I'm a female an have limited knowledge on this subject...lamens terms is best)
THANK YOU
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