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Idle or Stalling Problems - All Vehicles

446 messages,  Last post on Jul 28, 2009 at 4:58 PM

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What is this discussion about? Engine, Fuel System

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#377 of 446 Rough Idle When Warm 1995 Yukon by allchevyjim May 18, 2007 (5:58 pm)
My son has a 1995 GMC Yukon with 230000 miles. It is a smooth running and emissions compliant 5.7 liter V-8 at last inspection. Recently it started to idle erratically at low RPM idle (500 rpm)but only after the engine warms up. I replaced plugs and distributor and rotor. This did not fix problem. I then replaced the ignition module and still no change. I looked for vacuum leaks around the intake and found none. I have removed the EGR valve and it could not hold a vacuum with the diaphragm using a vacuum pump. The diaphragm would easily return to closed as the vacuum leaked quickly. I put the EGR valve back on, started the truck and tried to pull a vacuum on the EGR again. Repair manual says the idle should change and get erratic and it does not. Could this be a defective EGR? I looked up a replacement part on the internet and one version has a note that says the diaphragm cannot be tested by a vacuum pump. Seems to be inconsistent. I am stymied. Replies to this message: allchevyjim (May 20, 2007 3:28 am) allchevyjim (May 21, 2007 4:08 pm)
#378 of 446 Re: Rough Idle When Warm 1995 Yukon [allchevyjim] by allchevyjim May 20, 2007 (3:28 am)
Replying to: allchevyjim (May 18, 2007 5:58 pm) If I were you I would check and replace the coolant temperature sensor/switch next as long as you are throwing parts at it. These are reasonable in price at a local parts store. Make sure you drain some coolant first before removing the old sensor and replace the new. Top up the coolant and drive. I think you'll find this to be your problem as it fits the symtoms and for less than another $20 it is cheaper than running through all the aggravation of dropping your truck for service and a diagnostic test! Replies to this message: allchevyjim (May 21, 2007 4:08 pm)
#379 of 446 Re: Rough Idle When Warm 1995 Yukon [allchevyjim] by allchevyjim May 21, 2007 (4:08 pm)
Replying to: allchevyjim (May 20, 2007 3:28 am) I decided to check the circuits out before buying any new parts and could really find nothing else malfunctioning. There were no codes set on the ALDL so I do not think any sensor or effector was actually malfunctioning from a signal viewpoint. So I removed the idle air control and found it really dirty. I sprayed it with some brake cleaner and wiped it clean. I also did replace the PCV valve although it seemed to be working (<$3). I took it for a drive and it seems to be free from the warm idle problem that I had. So it cost me $73 to fix something that might have been free if I were a little smarter, quicker.
#380 of 446 1995 Nissan Maxima stalls by bsum May 23, 2007 (12:19 pm)
Hello, this morning my wife's car shut off completely while she was going about 30 mph, she rolled to a stop and then it started right up. I had the starter replaced about 2 months ago. Any thoughts as to what this could be? She did mention that it usually takes 2 times to start the car in the morning with a cold start. Thanks in advance! Replies to this message: kiawah (May 23, 2007 3:18 pm) bsum (May 26, 2007 9:46 am) elvia (May 23, 2007 3:26 pm)
#381 of 446 Re: [Mr_Shiftright] by twosnook May 23, 2007 (1:04 pm)
Replying to: Mr_Shiftright (Jul 28, 2004 9:03 am) Has anyone considered the Idle Control Valve? These stalling and greyhounding at idle could be as simple as cleaning this ICV. Replacing is a simple job. Replies to this message: chevyman20 (Aug 18, 2007 5:26 pm) 0patience (Aug 18, 2007 8:16 pm)
#382 of 446 Re: 1995 Nissan Maxima stalls [bsum] by kiawah May 23, 2007 (3:18 pm)
Replying to: bsum (May 23, 2007 12:19 pm) Not a Nissan, but I had a situation where the car just shut off, and then it started back up and ran poorly with check engine light on. It was the drive by wire throttle positioning sensor (effectively the electrical sensor on the gas pedal that senses how much throttle you want to give it).   Can't say that your problem has anything at all to do with it, there's probably a hundred things that could be wrong. Replies to this message: bsum (May 26, 2007 9:46 am)
#383 of 446 Re: 1995 Nissan Maxima stalls [bsum] by elvia May 23, 2007 (3:26 pm)
Replying to: bsum (May 23, 2007 12:19 pm) Hi, my car did the exact same thing, I was adviced by a very kind person on this website to have my mechanic check the fuel pump - that was exactly what it was! Good luck.
#384 of 446 Re: 1995 Nissan Maxima stalls [kiawah] by bsum May 26, 2007 (9:46 am)
Replying to: kiawah (May 23, 2007 3:18 pm) Thanks for the responses! My mechanic cleaned the air flow sensor and replaced the starter for free. We'll see how it goes.
#385 of 446 92 Chrysler 5th Ave stalls by jjpcat Jul 09, 2007 (9:54 pm)
This car has 157k miles and a 3.3L engine. It ran well for years till yesterday. It stalled 5 timed yesterday and twice today. In all these cases, the engine had been running for about 3-10 minutes before it stalled. When it stalled, the check engine light came up. But I was able to restart and drove the car away.   In cases 1-4 and 6, it stalled when I hit the brake. But in cases 5 and 7, it stalled when I was coasting at 15-35 mph.   Any idea?   Thanks.
#386 of 446 Fuel Pump by elvia Jul 10, 2007 (6:06 am)
Hi,   My car has over 100K on it. When it stalled it would start up again, no problem however, before it stalled it would begin to decelerate (slow speed) on its own until it just stopped running. Our mechanic replaced the fuel pump and we have not had any more problems since. Good Luck! Replies to this message: ggadette (Jul 17, 2007 2:32 pm)

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