Skip the auto shop - Our mechanics make house calls

Q: 1985 Chevrolet Chevette hard to start when cold

asked by on

My car won't idle. And it's very hard to start when cold. I believe it has no fuel left in the carburetor after sitting overnight. Recently, it continued running after shutting it off and then banged a bit. I believe the electric choke, timing, or vacuum may be at fault. This engine is installed in a 1929 replicar that I have just put 11,500 miles on without any trouble. It has always been garaged.

Hello. It sounds like the carburetor is not closing completely. This could cause the poor idle, hard starting and "dieseling" you are experiencing. The 6510-C carburetor you have uses and electric choke, which could definitely be the problem. It also has a stepped speed control system (SSC) which consists of a vacuum operated actuator that opens the throttle. The problem could be in this system too. I am far from an expert on carburetors, since they were phased out by the time I started my career. However, YourMechanic does have carburetor experts on hand who are ready to help you inspect your vehicle’s hard-to-start condition.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Left tire rattles, bar behind wheel is broken.

The broken bar may be the rear sway bar link arm has broken and may cause the vehicle to become unstable. I recommend limited driving until a mechanic like one from YourMechanic fixes the problem and inspects it for safety...

Q: '72 Mach 1 with 351C. Runs, idles, revs in park. Sputters, chugs and coughs in Drive. Any suggestions?

Check for proper advance of ignition timing. In particular, verify that advance curve you observe matches factory spec. Measure fuel pump output/pressure against factory spec. If engine compression is good and balanced, apart from timing check and fuel pressure check,...

Q: Truck shutting off after startup.

Hello, when you replaced the plug wires, it sounds like you removed all of them and then installed new wires. When you installed the new wires, it sounds like you got them out of order. The first thing to do...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...