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Electronic Quadrajet runs VERY rich
On Sunday, April 4, 2004 2:44:21 AM UTC-4, parkerea wrote:
> My friend has an '83 Olds Ninety Eight with a 307 V8 that is running > extremely rich. > > Symptoms: > > - The tailpipe is very sooty. On starting it leaves a large soot stain on > the ground beneath the exhaust. > > - It is so rich that when starting it barely runs; you must constantly gun > the engine to keep it alive. Once the choke opens it will idle, but is very > lumpy, and overall running is poor. > > - It gets terrible gas mileage, well under 10 mpg. The owner claims 5 or 6! > > > > Assuming I have done my research correctly, it is equipped with an > electronic Quadrajet 750. Although I am mostly guessing, I assume there may > be many potential causes: > > - A float that is losing buoyancy. > > - Sensor problem (O2 sensor? TPS? Other?) > > - Carb mixture control (solenoid?) stuck full rich. > > - Bad engine management computer. > > - ???? > > > > Initially I wanted to check the floats, but when I realized what I was > getting into I figured I better think before I jump. Being middle aged, my > backyard mechanic days are from 60's era cars, so I have never touched an > electronic carb, plus I have only rebuilt much simpler 1 & 2 barrel models, > so I don't want to jump into a major effort unless it is really needed. Not > to mention that the car currently runs, and after I "fix" it the car might > not. > > > > Questions: > > 1) Any likely candidates for this kind of problem? How likely are my > guesses? > > 2) Can the float level be checked without completely removing & > disassembling the carb? I read one bit that said "remove the air horn." as > if it is easy to do in the car, but I have my doubts, like they skipped that > pesky little "after removing the carb" step. > > 3) What is the mixture range that the engine management system can actually > control? In other words, if there is an EMS failure can it really make the > engine run this rich? From my limited experience with EMS on fuel injected > engines, I suspect the their range from full rich to full lean is > significantly smaller than might cause this level of problem. > > > > If it matters, the carb #'s a > > 17083253 > > 1573FLC > > > > > > Thanks in advance, > > parkerea Probably way too late but check the metering rod solenoid ,, Ohm value should be online some where. They go full rich with no input or open coil. |
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#2
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Electronic Quadrajet runs VERY rich
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