Stalling after stopping in traffic

Tiny
JFLEY
  • MEMBER
  • 1992 CHEVROLET CAVALIER
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 41,000 MILES
This a great car but it just recently decided to have a problem. The car starts up and runs fine but while driving and coming to a stop the idle seesm to fall off and the car stalls. After stepping on th egas pedal and holding it at a level it will restart and is drivable but the idle must be kept up or it will stall again, even while driving and coasting with no accelaration. My daughter can't drive this way. Me maybe. Any ideas?
Friday, January 11th, 2008 AT 7:49 AM

6 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
Not over looking the obvious like the normal tune up. These cars had a recall for a bad intake manifold gasket leaking, causing a skip at idle, but goes away when you give it gas. You can check this by spraying carburetor cleaner at the base of the intake manifold and see if the idle changes.
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Friday, January 11th, 2008 AT 10:01 AM
Tiny
JFLEY
  • MEMBER
  • 5 POSTS
Ok, That sounds like a plan.I'll give it a shot and get the results back uo here.

Thanks for taking the time to respond to this.
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Friday, January 11th, 2008 AT 12:11 PM
Tiny
JFLEY
  • MEMBER
  • 5 POSTS
Ok, I tried that fix, but found no leak.I took out and cleaned the Idle Control Solenoid, it was gummed up and seemed to work for a while but the condition has returned. Is there a link that describes my injection/control system you may know of? Something I can read to get a handle on operations?

Thanks for your help!

[/quote:d8dceda619]
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Sunday, January 13th, 2008 AT 9:37 AM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,750 POSTS
2 other things to check. First unplug the vacuum like on the egr valve and tap on it lightly to make sure it is not stuck open a little bit. Leave vacuum hose off, then drive it. The other thing is the map sensor on these always break the vacuum line going to them. Look very closely at the vacuum hose at the throttle body to the map sensor. Actually remove it. If it has not been changed yet it needs to be done anyway.
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Sunday, January 13th, 2008 AT 12:36 PM
Tiny
JFLEY
  • MEMBER
  • 5 POSTS
Great Call!
The MAP sensor, I was reading about it and it makes the most sense. This actrually feels like a vacuum proable more than anything, because when the car is driven it is fine. It is low idle fall off that is the issue.
I'll give that a try and l;et you know.

Thanks. AGAIN!
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Monday, January 14th, 2008 AT 6:35 PM
Tiny
JFLEY
  • MEMBER
  • 5 POSTS
Ok. So I changed out the MAP sensor, Idle Control Solenoid and fuel filter, new plugs, and wires. Thinking I might have had a number of issues fuel related. Removed and checked the Throttle Plate Sensor as well and it seems to move ok seeing how it is spring loaded. Still I am dumbfounded. Car runs great, then the idle falls off and before long it stalls. As if fuel is shutting down. Can somewhat hear the pump so I imagine it is good. EGR Sol, or maybe valve, fuel pressure regulator? I am ready to move the unreachable stop set screw to keep the idle up but I know that does not solve the problem only the symptom.

I would appreciate any help. Thanks so much in advance ![

quote="jfley"]Great Call!
The MAP sensor, I was reading about it and it makes the most sense. This actrually feels like a vacuum proable more than anything, because when the car is driven it is fine. It is low idle fall off that is the issue.
I'll give that a try and l;et you know.

Thanks. AGAIN!

[/quote]
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Saturday, January 19th, 2008 AT 1:35 PM

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