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On cold start up engine idle will surge from 800 normal to 1200 when gear is selected it reverts to 800.toyo Prado 2008 ,kdj120r diesel.After engine warms up no further probs for the day.

Idle surge on cold start up on a toyota Prado diesel KDJ120R.vehicle has done 105000klms.

Posted by Anonymous on

6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

  • 97 Answers

SOURCE: Cold Start Idle Issue

Problem might be the air control valve, it's located at the right side rear of intake manifold and has a hose going to the air intake duct from the air cleaner, as a test you might try pinching off that hose when the idle is a problem.

Posted on Sep 30, 2008

  • 32 Answers

SOURCE: rough idle, surges when cold

have it scanned,ck' tps sensor,mass air sensor,idle air sensor for output...kev-mn.

Posted on Dec 10, 2008

66 chrgr
  • 1011 Answers

SOURCE: 2000 durango 5.2 cold starts, engine stalls or rpm surging

i know this may sound stupid but if your battery is old or a little weak on this vehicle the idle air control solenoid will act speradicley hunting for were it should be and the vehicle will stall.replace battery

Posted on Feb 01, 2009

redbeard00
  • 957 Answers

SOURCE: wont stay running idle surges

Please tell me what you have already done. It could be a vacuum leak, idle control solenoid, fuel, in need of a complete tune-up, or some other issue. You may want to state what you have already done or replaced. How has the maintenance been on it and since its an older vehicle? You may want to preform a compression test.

Posted on May 31, 2009

  • 89 Answers

SOURCE: Idle surges when it warms up.

sounds like an engine management fault it will need to go on a computer

Posted on Jul 11, 2009

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1 Answer

2008 ford ranger 2.5, what could be the problem if engine starts normal but after second the engine fluctuate?


Bleeding the fuel system is typically only needed on high pressure systems like GDI and Diesel vehicles, and only to get them to start if they run dry once.
If your engine keeps running but the idle speed moves up and down there are many things that can cause that. More information is always helpful. Does it always do it whenever the car is running? Or does it only do it conditionally (IE Only when 1st started in the morning, only after warmed up or getting off the dreeway, only with AC on or at night...describe as much as you can.)
Most newer cars have computer controlled idle strategy that wants to idle the car cold around 1000-1500 rpm (After an initial higher rev called a FLARE) and then bring it down in 3 or 4 minutes to 700ish rpm. If it CANNOT bring it down by normal means, then many resort to something called FUEL CUT IDLE where it actually turns off the fuel momentarily and the RPM will drop because the car is stalling and running out of gas...then back on and it starts to rev back up and when it gets too hiugh it turns back off. Cars that do this can have annoying surges from 500-2000 back and forth at idle forever.

a vacuum leak or MAF meter problem can cause rough idle. ALmost any engine code that turns on CHECK ENGINE lamp may be suspect, does it have any current fault codes?

As well, consider Sticking manifold runners, EGR systems, and temperature sensors all can cause surging, so can a defective Oxygen sensor, slightly jumped timing, and dirty throttle plates the ECM wants to close more but they wont due to dirt. If its not something fairly obvious, it may require deeper checking.

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2000 durango 5.2 cold starts, engine stalls or rpm surging


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1 Answer

Cold Start Idle Issue


Problem might be the air control valve, it's located at the right side rear of intake manifold and has a hose going to the air intake duct from the air cleaner, as a test you might try pinching off that hose when the idle is a problem.

Aug 17, 2008 | 1990 Subaru Legacy

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