Question about 1999 Chevrolet Blazer

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Intermittant rough idle that might last a few minutes to a few hours. At first it seemed to happen only when the weather temperature was in the 90's, but now it's happening more often. A "map sensor" was installed, but did not help at all.

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A vacum hose off on top of the throtle body.

Posted on Jul 31, 2010

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Posted on Jan 02, 2017

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Runs rough when it's warm. comes and goes. has a 2.7. and then a 99 dodge carvan with a 3.3 does the same thing.


Chrysler Sebring Questions - Car running very rough ...

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CarGurusMar 27, 2011 - It seems after car gets to a certain temperature it runs very rough. ... 2011 at 12:16 PM about the 1998 Chrysler Sebring 2 Dr LXi Coupe ... it.one day it washot out and it was running sluggish with rough idle.and ... I changed the altnator and battery its runs like its brand-new.now ... 2002 Chrysler Sebring LXi.

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CarGurusNov 3, 2011 - Engine Power Loss After Car Is Warmed Up - Major loss of power after car has ... When vehicle is cold runs ok, sometimes a little rough but not bad. Full power. Allowed vehicle to run for over 45 minutes last night at idle, died on its own, car sat approximately 20-30 minutes. ... 2002 Chrysler Sebring LX.

* Chrysler Sebring/200 Convertible Club * • View topic - Rough ...

www.sebringclub.net/board/viewtopic.php?p=69097

Dec 29, 2006 - 5 posts - ‎3 authors
However, the vehicle still suffers from rough idle under certain conditions: ... been resolved (I don't think he noticed that it happened only when warm though). .... The test will tell you its general condition without having to dig it out of the fender, ..... Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group rough ...
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Jan 01, 2016 | 2002 Chrysler Sebring

3 Answers

Why is my truck idling rough but doesnt do it all the time


check throttle cable. A bad throttle cable will cause it accelerate
& decelerate. Check for worn out cable and replace it.

Jun 13, 2014 | 2000 Ford Explorer

1 Answer

1993 Ford explorer.Began idling rough and surging


The test connector is in a holder at the back bottom of the fuse/relay box on the passenger side fender well. There are 2 parts to it: the main connector and the ground, you will need both connected to the diagnostic tool to get the codes.
Check your IAC (Idle Air Control) valve on the side of the intake. These get carbon fouled and tend to stick causing high rpm for extended times. Also the EGR valve should be checked (under the intake) as it will cause rough idle or stalling near idle.

Mar 13, 2013 | 1993 Ford Explorer Limited

1 Answer

I have a 1989 sundance, it wont start when its cold out. once it gets alittle warm it starts.. whats wrong with it? please help


I think this TSB will solve your problem even know your car is older.



NO: 18-05-96 Rev. A
GROUP: Vehicle Performance
DATE: May 24, 1996

SUBJECT: **Intermittent Rough Idle**
NOTE: This bulletin supersedes technical service bulletin 18-05-96 dated February 16, 1996 which should be removed from your files. The subject description was printed incorrectly and is marked with **ASTERISKS**
MODELS: 1991 - 1995 Acclaim/Spirit/LeBaron Sedan 1991 - 1993 Dynasty/New Yorker/New Yorker Salon 1991 - 1993 Daytona 1991 - 1995 LeBaron Coupe/LeBaron Convertible 1991 - 1994 Sundance/Shadow/Shadow Convertible 1991 - 1995 Caravan/Voyager/Town & Country NOTE: This bulletin applies to vehicles equipped with 2.2 liter and 2.5 liter engine and high pressure throttle body fuel injection.
SYMPTOM/CONDITION:
An intermittent rough idle may occur during cold engine operation, within 3 minutes after engine start up, in rainy weather and temperatures of approximately 30° to 50°F.

PARTS REQUIRED:
Quantity Part Number Part Name 1 4288298 Idle Air Control Motor (IAC) REPAIR PROCEDURE:
  1. Remove A/C motor.
  2. Install new IAC motor (P/N 4288298) and rubber O-ring, torque to 2 Nm (17 in. lbs).
CAUTION: The rubber o-ring must be installed with the IAC motor for proper operation.

I would also recommend doing a fuel pressure test to see if it loses fuel pressure overnight.

Feb 10, 2011 | 1989 Plymouth Sundance

1 Answer

2002 Neon - car idle rough with the A/C on. Have changed spark plugs, air filter, etc. and still runs rough. Took it to a shop and there are no fault codes. The problem only happens when the car sits in...


YOUR ENGINE IS IDLING LOW.MOST CARS WHEN YOU TURN ON AC THE PCM WILL INCREASE IDLE SPEED TO KEEP ENGINE FROM STALLING OUT.I WOULD HAVE THE IDLE SPEED CONTROL CHECK OUT AT THE DEALERSHIP.THEY WOULD HAVE TO ADJUST YOUR IDLE SPEED.SINCE MOST IS PCM CONTROLLED.

Sep 26, 2009 | 2002 Dodge Neon

1 Answer

1998 BMW Z3 2.8 Idles rough when cold starting in wet weather


the problem could be in air mass flow sensor, but it's expensive

Jul 04, 2009 | 1998 BMW Z3 Roadster

1 Answer

Electrical short


a short will blow a fuse or fusable link intermittently,but your description pionts more to bad contact at alternator circuit,loose or damaged wire or maybe voltage regulator at alt.,assuming drive belt is tight!

Apr 14, 2009 | 1988 Ford F 150

1 Answer

Rough Idle and then the veh cuts off


Have you tried cleaning the mass air flow sensor ? Use Qtip and carb cleaner to remove any gunk on the two wires that strech across the inside.

Mar 19, 2009 | 1999 Pontiac Grand Am GT

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