No idle at initial start

Tiny
FLYINGDIRT
  • MEMBER
  • 1994 FORD RANGER
  • 3.0L
  • V6
  • RWD
  • AUTOMATIC
  • 196,000 MILES
Engine starts, idles rough then shuts off. After a few tries or, if you rev the engine a little, it begins to idle normally. This usually occurs at first start up. Sometimes it starts and idles normally. After that, it idles and drive normally. No codes are showing KOEO and KOER. Cleaned MAP sensor and checked all connections EGR, TPS, IAC sensors.

Suspect the PCM module. Do not have an engine analyzer tool.
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Tuesday, July 4th, 2017 AT 2:24 PM

6 Replies

Tiny
KEN
  • ADMIN
Hello,

To me it sounds like you have a vacuum leak. Here are a couple of guides that will help you get the problem fixed.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/stall-at-idle

Please run some tests and get back to us we are interested to see what it is.

Cheers, Ken

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Wednesday, July 5th, 2017 AT 5:21 PM
Tiny
FLYINGDIRT
  • MEMBER
Hi Ken,

Checked for vacuum leaks. None found. Air intake duct is new. Blocked EGR off, no change. Blocked ISC, no change in starting. On first start up when cold, engine starts, then idles roughly and dies. If you hold a part throttle at start and let the engine rev for a few seconds, it then idles normally. After that, it run, starts and drives the rest of the day. Seems to me, a vacuum problem would be present all the time? Can this be a computer problem? Could it just need some new plugs and wires? Don't know when it was tuned since I have only had for a few months. On my ALLDATA site, there is mentioned a recall for the stick shift vehicles with this problem. Still scratching my head.
Thanks, Stretch
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Sunday, July 23rd, 2017 AT 9:04 AM
Tiny
CJ MEDEVAC
  • EXPERT
What about a little 'Love Tap" or two on the IAC when it's acting up?

The Medic
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Sunday, July 23rd, 2017 AT 9:32 AM
Tiny
KEN
  • ADMIN
I am wondering if you have a temperature sensor that is a little out of range. Here is a guide to show you want you are in for and the location of the sensor (below).

https://www.2carpros.com/articles/coolant-temperature-sensor-cts-replacement

Please let us know what happens.

Cheers, Ken
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Tuesday, July 25th, 2017 AT 9:41 AM
Tiny
FLYINGDIRT
  • MEMBER
Ken, Kept fooling with the ISC valve. Turns out that this was the source of the vacuum/ idle problem. Replaced ISC and it's working okay. Thanks for your help. Stretch
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Saturday, August 5th, 2017 AT 1:05 PM
Tiny
KEN
  • ADMIN
Nice work, we are here to help, please use 2CarPros anytime.

Cheers, Ken
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Saturday, August 5th, 2017 AT 7:09 PM

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