fluctuating RPM

safeer93 said:

I own a 2015 manual GT with 33k miles on it. I have roush AB with X-pipe installed since a year ago and everything was normal. However, when I took my car for an oil change about a month ago at the Ford Dealer, I started noticing that when I turned on the car on a cold start the rpm went to about 700 and then slowly went up to 1.4k ish and then kept fluctuating until the engine warmed up and went down to 700 where it normally is. I thought that it was ok. What bothered me was that sometimes when I am in 2nd gear and clutch all the way in, the rpm would just stay around 1.5k like somebody is hitting the gas.

I went to the dealership and they just said that they saw what I was telling them, however, they did not fix anything and they just said to keep an eye for any CEL. With the warranty almost going away in 3k miles, I want it fixed before I have to pay out of my pocket. what do you guys think I should do? and has anybody experienced this?


Thanks in Advance.

Click to expand...

smann said:

Used to happen to mine too, when i tuned my car the idle is perfect now, starts at like 1K comes down to 750 rpm slowly. Nice and stable

Try an idle relearn, unplug your battery for 20-25 min and then reconnect battery and start the car letting it idle while the engine gets to temperature, then wait one minute.

Turn the AC to Max a little over one minute, then turn off.

Then go drive the car for about 10 miles.

Click to expand...

smann said:

Used to happen to mine too, when i tuned my car the idle is perfect now, starts at like 1K comes down to 750 rpm slowly. Nice and stable

Try an idle relearn, unplug your battery for 20-25 min and then reconnect battery and start the car letting it idle while the engine gets to temperature, then wait one minute.

Turn the AC to Max a little over one minute, then turn off.

Then go drive the car for about 10 miles.

Click to expand...