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Car Forum / Oldsmobile Cars / April 200791 Olds Cutlass Cierra choking out when under a load
Ok here is the problem....The car idles ok but when the engine is under a load such as acceleration, it will choke out like its not getting enough fuel. As long as the throttle remains down the engine will not recover, as soon as you let up on the throttle, it will recover fine. Once the problem has occured, if the engine is turned off it will not restart until it sits for about an hour. If you turn the engine off and the problem has not occured it will restart fine. No check engine light has ever came on. Here is a list of what i have replaced: Computer (ECM) Idle air control Pcv valve Alternator (old one was bad) MAPF Flow sensor unit Fuel filter Fuel regulator Fuel pump and strainer Crank timing sensor Throttle position sensor checked with ohm meter - seems fine Temp sensor New pluges and wires All 3 Ignition coils and modules 2 turtle doves and a partridge in a pear tree. I’m running out of hair to pull out, any help would be much appreciated Thanks, Chris  SignaturePosted at author's request, using http://www.AutoBoardz.com interface Articles individually verified to usenet standards. Visit URL to contact author/report abuse Thread archive: http://www.AutoBoardz.com/91-Olds-Cutlass-Cierra-choking-load-ftopict208832.html Exhaust plugged? Remove down pipe or oxygen sensor. See if it helps. Next possibility would be timing chain or belt. Pulled O2 sensor and drove the car around, same problem. I changed the timing belt, same problem. The car idles fine, you can even redline the tach and it will not act up, as soon you put the car in drive and step on the gas, or ease into it hard, it will choke out and die. Anyother thoughts?? What about the fuel injectors? Thanks in advance > Exhaust plugged? Remove down pipe or oxygen sensor. See if it > helps. > > Next possibility would be timing chain or belt. SignaturePosted at author's request, using http://www.AutoBoardz.com interface Articles individually verified to usenet standards. Visit URL to contact author/report abuse Thread archive: http://www.AutoBoardz.com/91-Olds-Cutlass-Cierra-choking-load-ftopict208832.html You've exhausted every thing I can think of. Is the gas fresh? You mentioned the MAPF sensor, is that the mass air flow or manifold absolute pressure sensor? If you ever fix it, be sure and post your results. Good luck. Its the mass air flow sensor. I checked the injectors with a noid lite and they are getting the proper signal from the ECM. The resistances are not quite right but i dont think that would cause a problem. The book says they should be 14.7 ohms, none of them were, they were 4, 9, 12 and 7. They were clicking when i checked them, but they are $65 a pop, i dont think im going to change them just yet. I will keep you posted > You've exhausted every thing I can think of. Is the gas fresh? > You > mentioned the MAPF sensor, is that the mass air flow or > manifold absolute > pressure sensor? > If you ever fix it, be sure and post your results. Good luck. SignaturePosted at author's request, using http://www.AutoBoardz.com interface Articles individually verified to usenet standards. Visit URL to contact author/report abuse Thread archive: http://www.AutoBoardz.com/91-Olds-Cutlass-Cierra-choking-load-ftopict208832.html > Its the mass air flow sensor. I checked the injectors with a noid lite > and they are getting the proper signal from the ECM. The resistances [quoted text clipped - 15 lines] > Articles individually verified to usenet standards. Visit URL to contact author/report abuse > Thread archive:http://www.AutoBoardz.com/91-Olds-Cutlass-Cierra-choking-load-ftopict... What engine does this have in it? When the resistance of an injector is to low, it draws too much current from the ECM and the overload causes it to shut down. At 14 ohms the injector will draw around 1 amp, at 4 ohms it draws 3 amps! I had similar symptoms on my son's 91 Ciera four months ago. Two trips to the mechanic (including a new coil pack) didn't solve anything. Finally I checked the resistance of the injectors, most we're 8 to 12 ohms but one was 3 ohms! When I left the injector wire disconnected, the car would start and run fine on 5 cylinders, but reconnect the wire and the engine died. Replacing that injector was the fix! Then yesterday the symptoms reappeared and sure enough another injector tested at 4 ohms. This time I'm replacing the rest of the set. It seems 15 years of heat and corrosion has taken its toll the the injectors. Otherwise, this car is so reliable and economical it's worth the price. > Pulled O2 sensor and drove the car around, same problem. I changed the > timing belt, same problem. [quoted text clipped - 10 lines] > > > > Next possibility would be timing chain or belt. Assuming auto transmission, what about it, or torque convertor ?? Could it be "bound up" to where it bogs down the engine when put in gear ?? or not starting in low gear (stuck in high gear) ?? When my 94 Ciera had a failed "torque convertor lock-up solenoid", engine would stall immediately when put in gear.
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