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Idle is very bad. 63,000 1994 standard corvette LT1. I am…

Customer Question
Idle is very bad ...

Idle is very bad

Mechanic's Assistant: How many miles are on the car? What size is the engine?

63,000 1994 standard corvette LT1

Mechanic's Assistant: Are you fixing your Corvette yourself? What have you tried so far?

I am not trying to fix by myself. ECR valve replaced, throttle body cleaned. New ignition wires & new spark plugs

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Is there a problem with 1994 idle ?

Submitted: 3 months ago.Category: Chevy
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Answered in 6 minutes by:
3/17/2018
Chevy Mechanic: Jerry Newton, Chevy Technician replied 3 months ago
Jerry Newton
Jerry Newton, Chevy Technician
Category: Chevy
Satisfied Customers: 5,655
Experience: ASE Master Technician, L1, Master GM Technician. Over 20 years of bumper to bumper GM experience.
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Does it idle rough, or too fast or slow, or what exactly is going on?

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Customer reply replied 3 months ago
best described as "bumping". Idle is bumping or jerking in Park or Neutral but when you shift into Drive idle is so bad you expect car to stop.
Chevy Mechanic: Jerry Newton, Chevy Technician replied 3 months ago

Is the check engine light on when it's running?

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Customer reply replied 3 months ago
No. SYS light went off after EGR was replaced and throttle body was cleanedegc
Chevy Mechanic: Jerry Newton, Chevy Technician replied 3 months ago

OK. LT1 had a pretty common problem with the MAP sensor vacuum hose splitting and leaking. Can you get a look at the MAP sensor and make sure the vacuum hose doesn't leak, and it's securely attached?

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Chevy Mechanic: Jerry Newton, Chevy Technician replied 3 months ago

Did you get this worked out?

Please take a moment to rate my answers using the stars at the top of the page, that's how I get compensated. Let me know if you need anything else, I am happy to follow up.

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