1993 Chevy Camaro

  • 6 CYL
  • 2WD
Smokes, takes a while to "rev up" runs crappy at low rpm and even worse at mid to high rpm. Feels like it's leaning over the more gas you give it. Had the computer test the coil pacs and it has all of the spark. Just put plugs and wires in and the other day checked them for foul and their all fine. I know the vacuum hose for idle fuel/air mixture is having a problem, because the motor wants to "run away", but we taped it all up and it is NOT leaking. We havent done a comp. Test on cylinders yet. Does he have a hole in a piston or ring problems. Also, new water pump, new heater core, new therm, blend door/ fan works fine, hoses come directly from water pump to the heater core and out to therm. No clogs ; radiator works fine, water pump is pumping. Still no heat. Now that winter is almost over, we live in South Carolina and he freezes his butt off; for no apparent reason. My question to yall is "What should we do now? And should he have bought a Ford?
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have the same problem?
Thursday, February 18th, 2010 AT 3:35 AM

1 Reply

O.K. First with the rough drivability:

Since you've eliminated the ignition system (?) As the source of your problems, it's time to check the fuel. Throw on a fuel pressure gauge and compare to spec. (Checking the fuel pump, filter and FPR)

Also, if the gauge needle is fluctuating rapidly, and pressure is out of range while accelerating, suspect clogged fuel injectors. You can do a cylinder drop/balance test to isolate each injector. (If you're not familiar with that procedure, write back and I'll walk you through it)

As for your "No heat":

Have you done a system flush? With the thermostat removed, connect a garden hose and flush the system. (Turn the heater controls on "HIGH", no a/c.) Check to see that water flows freely through the system. If not, then the heater core and/or the radiator could be clogged.

Also, is there ever an unexplained loss of coolant? If so, you may have a blown head gasket. When these motors blow a gasket, the exhaust gas is forced into the coolant system and the air bubbles get trapped in the heater core and radiator. This prevents the coolant from circulating correctly. (And will cause overheating after sustained driving over 60)

To do a quick test for this, remove the radiator cap or surge tank cap. Look inside as someone revs the motor to at least 1,500 r.P.M.S. If you see large bubbles, that's exhaust gas. (With a blown head gasket, coolant doesn't always get into the oil)
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Monday, February 22nd, 2010 AT 8:02 PM

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