Chevrolet :: 1982 Chevette Dies Intermittently / Gas Is Not Getting Into Carburetor
I've recently acquired a 1982 Chevette. 4-door manual transmission, gas (not diesel). It's being used for a film, and it's perfect except for one little issue.
The car starts fine (sometimes needs a little starter fluid), and generally drives fine around town. But if you sit and idle for a couple minutes after driving (usually longer than a normal red light), once you start going (usually in 2nd gear), the engine sputters and the car dies. When this happens, the car won't start for 10-15 minutes. The engine turns over but doesn't fire. Starter fluid will get it going, but as soon as it burns that, it dies.
The problem appears to be that gas is not getting into the carburetor. It has a new fuel pump, and we've replace the fuel line and cleaned out the fuel filter. The carb is not stock. It's a Holley that it had when we purchased it. There are a lot of outlets capped off, and I don't know enough to know what might not be hooked up properly.
After the car dies, the fuel pump buzzes as if it's trying to pump fuel, but it doesn't appear to actually be pumping. Normally we just wait it out, but sometimes we kill the battery trying to restart it. We've successfully push-started it a couple of times, but that only works after enough time has passed that it would have probably started up fine anyway (if we hadn't killed the battery trying).
To sum up, if we follow this sequence of events, the problem will always present itself: start up normally (after not having driven for a couple hours), drive a few miles, idle for 2 or more minutes and then continue driving. Once we continue driving, it dies before we get up to speed.
What to do? I only know enough about this to barely describe the problem, but I am not a car guy. I've been learning little by little with this one. We have recently replaced the spark plugs, wires, distributor cap and rotor, ignition control module, ignition coil, thermostat, o2 sensor and alternator belt. None of this has had a noticeable affect on the problem.
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Now - starts fine, idles about 10 seconds and then begins to idle rough and dies. If I use the throttle I can often keep the idle up, but then backfires or acts like no fuel and again dies. Used fuel cleaner and made sure there was plenty fuel in tank.
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Went through the reset process for the ECM to learn the new one and it the idle has come down to 1800RPM, it also literally DUMPING fuel through the injectors into the top of the throttle body. While I don't believe it is actually running rich, it seems more like the idle is trying to compensate for the excess fuel that is being dumped into the top end. Now, Before I go any further I want someone else's input. "I" think it is a also a bad throttle position sensor that probably got wet when cleaning the TB. But I am worried it could also be the PCM has finally gone out, although this is probably not likely because the entire ignition is run by this and if it was bad, it would stand to reason that it wouldn't run at all. Or it could be a bad vacuums control module. I have checked all my vacuum lines and do not have any leaks, so I know that isn't the problem. So that's where I am. I am hoping to check the leads on the TPS today with a ohm meter. I know my resistance levels.
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