Engine has a high idle?

Tiny
BRENT BASHAM
  • MEMBER
  • 2006 FORD F-150
  • 4.6L
  • V8
  • 4WD
  • AUTOMATIC
  • 250,000 MILES
Changed plugs and cops, truck ran great! A week later cleaned mass flow, still runs great but, now cranks at extremely high idle (2000rpms) Every time it's cranked!
Suggestions?
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Saturday, October 31st, 2015 AT 1:57 PM

37 Replies

Tiny
MHPAUTOS
  • EXPERT
You may have an air leak at the throttle body or a problem with the IAC check this first. This guide can help us fix it

https://www.2carpros.com/articles/engine-idles-too-high

Please run down this guide and report back.
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Saturday, October 31st, 2015 AT 2:13 PM
Tiny
BRENT BASHAM
  • MEMBER
Ok, I'll check. I didn't use a new gasket on the mass flow, (pretty dumb on my part) it's the only thing that was disturbed and probably where it's at.
I'll change this first and see if that fixes it.
Thanks for your info !
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Sunday, November 1st, 2015 AT 8:41 AM
Tiny
MHPAUTOS
  • EXPERT
OK, good place to start looking, good luck with this.
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Sunday, November 1st, 2015 AT 12:29 PM
Tiny
DBAUER78
  • MEMBER
  • 2002 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 190,000 MILES
The vehicle will suddenly kick into very high idle (over 3 rpms) and will not 'kick' down, but, it will only move at maybe 12 miles per hour. I don't know if this is engine or trans problem. The last time my husband 'banged' around the engine (most things are tested this way, to my dismay) but it did stop. We took it to a mechanic who could find nothing wrong and it has now happened again. I will have it towed to a dealer (?) But would like to know if you have any suggestions as to what would cause this?
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Saturday, December 26th, 2020 AT 1:02 PM (Merged)
Tiny
JACK42
  • EXPERT
For starters scan the PCM (computer) for codes

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If the PCM sees a problem it will store a code that will help in diagnosing the problem, get back with the exact codes.Sounds like it could be the IAC (idle air control) sticking, but will need to be scanned as to why it wont go over 12 mph.
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Saturday, December 26th, 2020 AT 1:02 PM (Merged)
Tiny
SEANDOGGX
  • MEMBER
  • 2002 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 138,400 MILES
I recently had a major tune up, new fuel pump, new engine and transmission mounts. But now at 35 mph it revs up by itself for a moment. Sometimes it revs as it's shifting at about 20 mph. It's an automatic. What do you think may be causing it to rev up on its own? Its not shifting hard.
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Saturday, December 26th, 2020 AT 1:03 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Based on your description (assuming the transmission isn't slipping) it sounds like a problem with the throttle position sensor or idle air control valve. Has the check engine light come on?

Let me know.
Joe
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Saturday, December 26th, 2020 AT 1:03 PM (Merged)
Tiny
SEANDOGGX
  • MEMBER
No, no check engine light has come on. I took it to a transmission shop, they said it sounds like the transmission is slipping and the gears making a noise also.I was told it would be from $1,600.00 to $2,000.00 from one shop to fix it and up to $2,500.00 from another shop. But if I find a transmission somewhere else they will install it for $450.00 including the fluid and $500.00 from the other place not including the fluid. I have found a re-manufactured transmission online for $1,374.00 3 year warranty 100,000 miles with parts and labor. So it looks like i'm going to just go that route and just pay the $450.00 to have it installed. Crazy stuff going on with the truck lately.
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Saturday, December 26th, 2020 AT 1:03 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Did this happen all at once?
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Saturday, December 26th, 2020 AT 1:03 PM (Merged)
Tiny
SEANDOGGX
  • MEMBER
No, I was having problems with the truck not starting all the time. Thought it might be the fuel pump, I got the plugs, radiator, air filter, fuel filter done to see if maybe it was mainly the plugs. Then 2 weeks later I had problems with the drive line. It needed bushings etc. I was told at that time I needed new motor mounts. Then a week later the fuel pump fully went out, so that was replaced.A couple days later I had the motor mounts and transmission mount replaced. Then this last week it was started the revving at 35 mph and sometimes at 20 mph.I took it in yesterday and they said the transmission was slipping and the noise I heard was from the gears. My lowest quote to rebuild it was between $1,600.00 to $2,000.00. But I can buy a re=manufactured transmission with a warranty with torque, 2 year warranty, parts/labor, 60,000 miles for $1,270.00 or another place 3 year warranty with torque, parts and labor, 100,000 miles. The cheaper one is from Boss (online) the other one is also from online and searchparts. Com they said the transmission they mention was from the Ford distribution warehouse. Boss doesn't require a core charge, but search for parts does. Overall it seems like a better situation to buy a re-manufactured one with the warranty. What do you think?
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Saturday, December 26th, 2020 AT 1:03 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
I agree. Are you able to install it?
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Saturday, December 26th, 2020 AT 1:03 PM (Merged)
Tiny
SEANDOGGX
  • MEMBER
I found a transmission shop who said they would install it and fill it with fluid for $450.00. A mechanic I have used before told me there was a gasket that connects to the engine that needs to be replaced. He said nobody ever tells customers about it but it needs to be replaced.I called and asked about that so called gasket and I was told there is no gasket. It sounded funny to me anyways.I just thought the transmission was attached with the mounting bolts, then the drive line was attached to that and the dipstick up under the hood.I think he was trying to scam me.
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Saturday, December 26th, 2020 AT 1:03 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Honestly, there are no gaskets between the trans and the engine block. Like you and the shop doing the work, I've never heard of it.
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Saturday, December 26th, 2020 AT 1:03 PM (Merged)
Tiny
SEANDOGGX
  • MEMBER
I guess there are no gaskets but there are seals? For front and rear pumps. After reading all of the conditions and terms I thought it to be a better option to have a close local shop rebuild the transmission. They said it would be between $1,600.00 to $2,000.00 so rebuild the transmission. They have a 1 year/12,000 mile warranty. The online places said I would have to send back a part if the transmission were to have a problem with the transmission.I know they may have good products but if I were to have a problem it seems like it would be such a hassle. Let alone they require for all new parts to be installed along with the transmission or the warranty would be void. They said you must put in a new cooler, new front and rear seals, and replace any clogged linkage etc. So I decided to let the local transmission place rebuild it. So we will see what happens.I m sure they will do a good job.I suggest everyone looking to buy a transmission, engine or any major part online to read the terms and conditions fully so you make sure you know everything you have to do in order for your part to have a warranty and not be void.
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Saturday, December 26th, 2020 AT 1:03 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
That sounds like a plan. As far as your original question, yes there is a seal on the front pump where the converter goes through, and the front pump has a gasket. However, both are always replaced when a trans is rebuilt. Between the transmission and engine block, there isn't one.

Let me know if you have other questions.

Joe
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Saturday, December 26th, 2020 AT 1:03 PM (Merged)
Tiny
ST49BJ11
  • MEMBER
  • 2002 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 185,000 MILES
Why truck continue to idle high and low after it is warm up? 4.6l engine.
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Saturday, December 26th, 2020 AT 1:04 PM (Merged)
Tiny
2CEXPT
  • MEMBER
Do you have a check engine light and when was the last tune-up?

Try cleaning out the idle air control valve and also the MAF sensor with a electronic cleaner CRC and see what happens.
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Saturday, December 26th, 2020 AT 1:04 PM (Merged)
Tiny
HRYDERIII
  • MEMBER
  • 2002 FORD F-150
  • 6 CYL
  • 2WD
  • MANUAL
  • 83,000 MILES
Hi

Recently I noticed high RPM upon startup. It is 40 to 50 degrees here now. And also a slight hesitation upon acceleration. I pulled the codes and got P0174. I got some MAF cleaner and sprayed it really good.

The code went away. The hesitation went away. Now I am left with the high upon startup.

Please help.

Harry
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Saturday, December 26th, 2020 AT 1:04 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
Hi HRYDERIII,

All modern engines are designed to run at a higher rpm when the coolant temperature is low so it is normal for the rpm to be higher during cold start. It can range from 1,200 to 2,000 rpm's depending on the temperature and would drop after a short while.

The cleaning of the MAF could have increased the rpm at cold start as it is reading more accurately than it previously was.

What is the cold start rpm now? If it is less than 2,000 rpm's, then you have nothing to worry about, unless it fails to drop after a short while.
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Saturday, December 26th, 2020 AT 1:04 PM (Merged)
Tiny
HRYDERIII
  • MEMBER
Hi,

I think I'm okay. The last cold start at 48 degrees was 2,200 rpm's for a few 3 to 4 seconds.

Thank you,

Harry
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Saturday, December 26th, 2020 AT 1:04 PM (Merged)

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