Question about 1990 Chevrolet Cavalier
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Posted on Jan 02, 2017
SOURCE: map sensor
that is not a map sensor(mass air flow) it is a barometric switch also know as a mps(manifold pressure sensor) if your vehicle idles fine but when you try to accelarate. i have a question? is it a throttle body or a carburator type fuel system?
Posted on Sep 01, 2008
it almost sounds like a fouled fuel injector. this is a tricky problem because it involve so many different operations. the maf is used to deliver fuel and the o2 sensor tells how much. there are 2 o2 sensors one before cat 1 after. mabey check these out visually. the computer should pick these sensors up if there bad. is this a supercharged engine? ill try to come up with some other ideas for you soon.
Posted on Mar 12, 2009
This sounds like a fuel issue to me. If I am not mistaken, this engine has two injectors running on a separate fuses. Remove the air cleaner assembly, and make sure both are firing while engine is running. If so, then check the fuel pressure. If you have a fuel pressure gauge, connect it to the fuel rail, and start it up. Remove the vacuum line from the fuel pressure regulator to see where it is set. You should have at least 36lbs of fuel pressure. If the pressure is too low, check the fuel filter. It may be clogged, or you might have a weak fuel pump.
Also you changed the throttle position sensor, you will need to make sure it is set properly.
hope this helps,
Posted on Mar 24, 2009
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