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Joshua Haynes
Joshua Haynes,
Category: Hyundai
Satisfied Customers: 273
Experience:  Lead Technician/ Manager at Precision Tune Auto Care
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What would cause a 5 speed 2004 elantra to fade in and out

Customer Question

what would cause a 5 speed 2004 elantra to fade in and out slowly,(still runs) while at idle
Submitted: 1 year ago.
Category: Hyundai
Customer: replied 1 year ago.
run fine just at idle or in low gear (1st or 2nd) new clutch just put in. has been setting for 4 months. put put ultra gas and and injector cleaner in while filling tank
Expert:  Joshua Haynes replied 1 year ago.

Hi, my name is ***** ***** I will try to help out. Do you have a check engine light on or any other symptoms to speak of?

Customer: replied 1 year ago.
light is on
Expert:  Joshua Haynes replied 1 year ago.

do you have a way to scan it?

Customer: replied 1 year ago.
no, not at this times it does not cause the tec to bounce. it just sound like a fade in and out, never shuts off or stalls while driving
Expert:  Joshua Haynes replied 1 year ago.

so when you say that it fades in and out, you don't mean the tac fades in and out?

Customer: replied 1 year ago.
no it stands still. it just the motor sounds like the gas is going in and out or better , it sound like it is have gas cut back . sound like it is breathing(form of speaking of course)
Customer: replied 1 year ago.
could it be the injectors ?
Expert:  Joshua Haynes replied 1 year ago.

I really doubt you have an injector issue...It sounds more to me like a vacuum leak. I would use a flammable spray such as brake cleaner and lightly spray around the engine bay to see if you can detect an idle fluctuation. If you do, then check in the area you are spraying at the time that it occurs for a vacuum leak. Some main places to check are the intake gasket and main vacuum lines like the one going to the brake booster.

Customer: replied 1 year ago.
thank you will try
Expert:  Joshua Haynes replied 1 year ago.

Good luck, my friend!