Any detectives in the house? Random stall + strange idle

StreetCreeper

New member
The other day I was sitting in a parking lot idling the engine while waiting for the wife to finish shopping. After about ten minutes, I noticed the RPMs jump up about 500rpm then back down to normal. It did this quickly about three times in a row before I goosed the throttle and it immediately settled down to normal.

About 30 minutes later I was doing the same thing in a different parking lot and noticed it did it again. I again goosed it a little and it settled down to normal.

About 5 minutes later as we were leaving the parking lot the engine died as I was slowly cruising through the lot. I threw it into neutral and it fired right up and drove perfect ever since.

Today I was simulating the same situation to see if would do it again but it would not do it again.

In the 51,000 miles I've driven this truck, it has only died like that one other time about 7 months ago when rolling to up to a stop light. Again it fired right up and never skipped a beat.

No codes showing on the ScanGauge either.

Any thoughts on such random occurrences?

New air filter a couple weeks ago and plugs, wires & maf cleaning maybe 15-20k ago.
 
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The other day I was sitting in a parking lot idling the engine while waiting for the wife to finish shopping. After about ten minutes, I noticed the RPMs jump up about 500rpm then back down to normal. It did this quickly about three times in a row before I goosed the throttle and it immediately settled down to normal.

About 30 minutes later I was doing the same thing in a different parking lot and noticed it did it again. I again goosed it a little and it settled down to normal.

About 5 minutes later as we were leaving the parking lot the engine died as I was slowly cruising through the lot. I threw it into neutral and it fired right up and drove perfect ever since.

Today I was simulating the same situation to see if would do it again but it would not do it again.

In the 51,000 miles I've driven this truck, it has only died like that one other time about 7 months ago when rolling to up to a stop light. Again it fired right up and never skipped a beat.

No codes showing on the ScanGauge either.

Any thoughts on such random occurrences?

New air filter a couple weeks ago and plugs, wires & maf cleaning maybe 15-20k ago.

Sounds like IAC valve symptoms. Take yours out and clean it up, huff a little, put it back in. You should now get 32 MPG and increased 0-60 times. Your mileage may vary.

:peace:
 
Unfortunately I don't have any advise for you but I am curious too as I was driving mine from Houston to Austin the day I bought it and a few hours on the road I pulled into a parking lot and when I was stopped the idle went down to about 200 and then died. I immediately was able to start it up and it hasn't happened again but it was still odd.


Sent from my iPhone using Tapatalk
 
Unfortunately I don't have any advise for you but I am curious too as I was driving mine from Houston to Austin the day I bought it and a few hours on the road I pulled into a parking lot and when I was stopped the idle went down to about 200 and then died. I immediately was able to start it up and it hasn't happened again but it was still odd.


Sent from my iPhone using Tapatalk

Both times mine died, I never noticed the idle drop from normal until it suddenly dies. Granted I was driving both times and not watching the tach, but I never had any indication at all until I heard the motor stop (I have a Flowmast exhaust so when the engine dies it very apparent).
 
Idr if mine dropped and sat at 200 for a moment or if that's about the spot it was when I looked before it died as the rpm gauge went to 0. Either way it sounds decently similar


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I've had this happen at a red light twice in the past year. Put it in neutral and it starts back up great. Once before cleaning the IAC, once after. Such an inconsistent problem that I'm not too worried. Still weird though.

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