Skip the auto shop - Our mechanics make house calls

Q: High idling on a 1998 Cadillac Deville

asked by on

I've got a 1998 Cadillac Deville. The car runs well but randomly the outer shoots are way up and get stuck at 2400 RPM. I cleaned the throttle body, checked the throttle cabel, disconnected cruise, replaced IAC and TPS. Just can't fugure it out.

A: If it’s idling that high, something is real...

If it’s idling that high, something is really sticking there. You might check your throttle cable because it’s an old one. It’s not the modern one that has a drive-by wire with no throttle cable. Check the throttle cable as it could be sticking. The cable could also be frayed.

You can lubricate the cable just like a motorcycle cable. Get a spray lubrication and spray the lubrication inside the cable to keep it from sticking. You’ll want to make sure that the throttle itself isn’t worn. You said you cleaned it but sometimes when they get old, they warp and the throttle will stick in open positions. In that case, you’re going to have to buy a new throttle assembly. They cost a whole bunch of money so you might go to a junkyard for something like that. You may want to have a mechanic inspect your high engine idle in order to diagnose the problem and make the correct repairs.

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: Nissan primera p11 won't rev pass 2500 rpm

Hi there. The car sounds like it has gone into limp mode for some reason. I would double check to be sure the MAF is working properly as this will cause this type of reaction as well. Check to see...

Q: After being driven for 20 minutes and parked for 1 hour, the car won't idle after restarting. What is a possible cause of this?

If the vehicle drives fine when cold and starts showing issues after the engine warms up, there may be a problem with the idle air control system. Another possibility is a gasket that may seal fine when the car is...

Q: After changing the throttle body do we need to reset computer

Hello, thank you for writing in. There is a reset procedure for the throttle body for Nissan. It will include cycling the key "On" (not to start) for 2 seconds, and off for 10 seconds. Repeat this three times. Leave...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.