Question about 1999 Chevrolet K2500

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My 1999 k2500 with 5.7 surges at idle only the

My 1999 k2500 with 5.7 surges at idle only when the weather is hot. It idles lower and lower until the IAC cathes it. No codes

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  • csfoltz Jul 28, 2009

    Yes I have and it didn't make any difference.

  • csfoltz Jul 28, 2009

    It will run all winter with no issues and only acts up when the weather is above 80 degress or so.

  • Richard Scordino May 11, 2010

    Checked for vacuum leaks and map sensor? don't always rely on codes. EGR system can also do this.

  • Richard Scordino May 11, 2010

    Tried cleaning heated wires inside the mass air flow sensor?

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Have you checked for any vacuum leaks? If the vehicle has higher mileage then a fuel system cleaning maybe required.

Posted on Jul 31, 2009

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1 Answer

02 deville getting air out of cooling system


Remove the cap from the surge tank. Set the heater control temp to max (A/C in any mode EXCEPT max). Start the engine and idle until lower radiator to pump hose is hot. Allow the engine to cool to ambient, and then check/fill the surge tank and replace cap.

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I have a 99 civic 4 door and the engine surges at idle


hot engine or cold, or both???????????????????
surging or hunting idle is complex but for sure the ECU has lost control of idle speed , there are 2 macro reasons, (vast causes)
1: ISC is stuck (in non SAE terms, the idle speed control valve ) is stuck.
2: engine is missing cause the ISC to GO NUTS trying to control
idle and can not.. the 50 reasons, , have list ask.
we do tests to find out if either or both the above are bad.
do you want tests, or guessing>???

Jan 22, 2014 | 1999 Honda Civic

1 Answer

97 toyota surges at an idle


(which engine. ?????)_
as always check all fuses. and scan the ECU for DTCs. first.
there is no need to fix OBD2 cars like 1980 cars (hard rows to hoe)
it can be 2 problems this......
lets fix the easy one first. idle. (and hope for moving issues to fix for free) it idle car is parked, so is 100% safe tests. (not moving)

so it surges at idle.
questions.?
1: hot or cold or both.?
2: low extreme RPM and high at idle.

400 to 800 RPM? surge.
1000 to 2000. what? numbers tell the tale.

first off, idle is the last thing to work right on any engine.

there are many ways to find what is wrong.
fix idle surge way.
i make sure that the engine holds closed LOOP status.
hot idle, if not , i fix that first.
keep in mind if not in closes loop and lean
all lean engine surge and guess what the ISC will add to the surge
because idle is way too slow, so the ECU open the ISC wider
and wider and its still too slow, so the ECU resets the ISC
this cause a worst hunt (surge)
the ECU adjust spark time and the ISC to get 800 rpm. (spec. look up yours)
so say , i see closed loop failed, OBD2 scan page 1
i look at the O2 sensor an its stuck lean.
if stuck lean and it really is (o2 bad?) then its lean and it will surge
.
examples.
1: i find 02 sensor bad, (only effects idle and light steady cruise)
2: i find fuel pressure at 15PSI , hopeless low .
3: i find all injectors clogged. and lean.
4: with MAF EFI, ( i find maf reading too low, (dirty) causing lean.
5: if MAP car, i find the MAP stuck hard high vacuum causing lean.
not knowing what engine you have or the idle hot surge range,
i can not go farther.

the driving bog tells me,
1: scan the ecu ,get DTCs; do that first.
2: clean MAF if car has one, ask how..
3: check fuel pressure.


my guess is engine is lean. and starving for fuel all the time.
cept WOT.

MAF cars starve for fuel if there are any vacuum leaks.
MAP cars do opposite, they race fast with 100% full power.
MAF is air density EFI
MAP is speed density EFI.
apples and oranges diffr. so what engine.


Jan 07, 2014 | 1997 Toyota Tacoma

1 Answer

No high idle for cold start have replaced IAC still nothing. truck idles at 1000 during cold or hot weather


Needs to be tested for power/ground and control signals at the IAC. Also should be smoke checked for vacuum leaks. Recommend a mechanic at this point as throwing parts at it has not fixed it.

Dec 10, 2013 | 1999 Ford Taurus

1 Answer

Surging idle


Bad throttle position sensor.

Nov 24, 2013 | GMC Yukon Cars & Trucks

1 Answer

Daihatsu sirion 1999-issue-not keeping idle,


Most times engine surging is caused by a manifold vaccuum leak. Lightly spray some carburetor cleaner around the intake manifold and vaccuum lines to check for a leak.

Oct 29, 2013 | Cars & Trucks

1 Answer

1999 oldsmobile intrigue stalls and surges under deceleration conditions only. Idles in neutral fine, accelerates fine, has no apparent miss. Can put in gear and travel great until under negative torque...


Do you have any codes? If so, what are they?
If not, this could be a mechanical problem with either the torque converter itself or some sort of stuck valve in the valve body inside the transmission.
I just replaced the valve body in my wife's 1999 Mercury Sable and it cleared up a number of problems she was having with shifting and torque converter lock up.
I hope this helps.
Good Luck!

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2 Answers

Rough idle / engine surges until power is applied


Sounds like a possible vaccume hose leak?

Feb 07, 2009 | 1997 Chevrolet Astro

1 Answer

Cold Idle Surge


sounds like you have a vacumn leak some where need to find that first

Jun 19, 2008 | 1999 Honda Prelude

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