Question about 1993 Nissan Pathfinder

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Rpm fluctates when warming up and also stalls when

Rpm fluctuates at times when warming vehicle. when driving vehicle stalls when shifting into gear. tested air flow meter but still okay. was told possible transmission replacement but what role does the transmission play when the vehicle is warming up?

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Check the egr valve & for other vaccuum leaks.

Posted on Jul 14, 2009

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Rough idle after engine is warm


Dirty air filter, dirty throttle body...try 2 bottles of gas line fuel injector cleaner...has your car been parked for awhile? Heet gas additive will work on any low gas tank sludge that you may have. Hope this helps.

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1996 mercedes c280 dies when put in drive


Engine stalls or RPM fluctuates at idle up and down or dies near idle.

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control

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Alrighty. I've asked this a few times before, I have more info now. CHEVY 350 K1500. 1993. Replaced intake gaskets, (bad oil leak) dropped a small amount of coolant in with oil while doing so. Changed oil...


how did you clean the gasket off of the head? if you used a sanding disc the grit will eat up the bearings. are you reading pressure with a mechanical gauge? you have replaced all bearings??

6 psi @ 1000 RPM
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I have a F250 lariat with a 460 - truck stalls when I put it in gear - even after it runs for 20 min. Sometimes it will stall while I'm driving. I had carborator replaced last year. Hope you can help.


Some possible causes could be:

Vacuum leaks cause an engine to run lean witch can cause the vehicle to stall when put into gear.

Improper base idle adjustment can cause the vehicle to stall when shifted into drive or reverse

A malfunctioning or damaged carburetor can cause the vehicle to stall when shifted into drive or reverse

Improper ignition timing can cause the vehicle to stall when shifted into drive or reverse.

A malfunctioning or damaged transmission or torque converter can cause the vehicle to stall when shifted into drive or reverse

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Some modern vehicles when change the shift pattern while the engine is cold, by keeping the vehicle in a lower gear for a higher rpm while the engine is cold, the engine warms up faster, to reduce emissions. (Emissions are higher while the vehicle is cold)

What you may be experiencing is that the shift from first to second occurs at a higher rpm when the engine is cold than when warm. This can lead to an abrupt or hard shift. At higher speeds, the shift between gears either may not be changed, or just does not feel as hard as the 1st to 2nd shift.

If this is the case, then your dealer is telling you the truth and there is nothing he can do.

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What is your speed at 3k rpm? What rpm would you estimate was previously 'normal' for highway cruising? If your Lexus is auto trans, it could be two things, it's either not shifting into the highest gear, or it's possibly slipping in gear (although I would think that would cause the rpms to fluctuate, not stay at a steady 3k). If it's a stick shift, again, it could be clutch slippage, but my choice from your description would be not shifting into the highest gear. Bring it up to highway speed slowly, counting how many shifts it makes, I.m guessing it's a 5 speed auto, but I'm not sure about that.

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start by pulling hose off egr valve see if idles smoother almost instantly

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