1993 Corvette

TRACIJOS

MEMBER
1993 CHEVROLET TRUCK

I have a 1993 Chevy Corvette with 80,000 miles and auto transmission. The engine cuts out and hesitates when under a little load with a little throttle applied. Happens at all speeds even at a stop. If I give it more gas the hesitation stops. At high speeds the engine cuts out and then kicks back in. When this problem occcurs the temperature gauge goes up. First thought was that the transmission was slipping out of gear and took it to a shop. They rebuilt the transmission. Problem still existed so they drove it with a fuel pressure gauge and fuel pressure was OK. They replaced the radiator, thermostat and electronic control module and this solved the problem for a few months. It just started happening again although engine isn't running as hot as before. Any ideas?

Saturday, December 9th, 2006 AT 6:25 PM

4 Replies

MATHIASO

MECHANIC
1,209 POSTS

Low engine vacuum will cause a vacuum modulator to sense a load condition when it's actually not present.I say this because you have to keep your foot on the gas pedal to keep the engine running.

You can start checking at the line or hose to the modulator between the throttle body and the modulator with a vacuum gauge.
The modulator should be receiving engine manifold vacuum. If it does there are no vacuum leaks in the line to the modulator.
Check the modulator itself for leaks with a hand held vacuum. The modukator should be able to hold about 18 in. Hg.
Check the modulator for ajustement.
If the modulator is low, check the engine vacuum

a coomon problem foee low vacuum is a restrited exhaust'

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Saturday, December 9th, 2006 AT 9:47 PM

2CARPRO JACK

MECHANIC
11,533 POSTS

I would look at the Mass Airflow meter. They dont last forever and they measure the amount of air coming into the engine. See them as problems more and more every day.

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Sunday, December 10th, 2006 AT 8:01 AM

TRACIJOS

MEMBER
2 POSTS

I am unable to find that the 1993 chevy corvette had a mass air flow sensor. Is it called something else for this model?

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Sunday, December 10th, 2006 AT 8:28 PM

MATHIASO

MECHANIC
1,209 POSTS

There are only two common types of mass airflow sensors in usage on gasoline engines. They are the vane meter and the hot wire.

Did you check your engine vacuum?Your modulator?Or vacuum line as I have mentioned?
A low vacuum cause the transmission not to run properly and will damage its part over long run.

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Sunday, December 10th, 2006 AT 11:39 PM