Question about 2000 Pontiac Firebird

1 Answer

Idles rough when coasting

I have a 2000 firebird with the 3800II v6 engine and 5 speed manual transmission. It has the 'drive by wire' throttle body. I like to do a lot of coasting down hills instead of keeping it in gear. When the engine is warm and coasting in neutral, the engine will drop the idle to normal, then shortly after drop real low, almost until it stalls, rev itself up and then do it again. This happens repeatedly until i come to a complete stop, or i play with the clutch pedal. When this happens, the engine looses oil pressure for a seccond. It still happens after i cleaned out the throttle body with cleaner and bypassed the clutch start switch. It doesn't happen when the car is stopped or cold. Can someone please help me?

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 112 Answers

Have you checked all the vacuum pipes around the top of the engine.?
It`s not losing oil pressure, it`s just about to stall when the oil light comes on.
Listen for a hissing noise under the hood.
Vacuum leaks can cause real problems with the inlet manifold pressures.
Good luck.

Posted on Jan 31, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

I have an Elantra 1.6 gls rough idling when switching on ac 1.6gls 2003


First try cleaning the engine throttle body and the idle speed control valve, it may have a slow idle due to these parts being full of sludge. Use a can of spray throttle valve cleaner. After cleaning disconnect the battery negative post for 5 minutes and then drive it about 5 miles, if the idle shake continues the next step is to install new engine and transmission mounts,.

Jun 26, 2016 | AC Cars & Trucks

1 Answer

2007 ford sport trac 4.0 v6 rough idle was told this truck has no IAC? New plugs wires cleaned throttle body been smoke tested no vacumm leaks rpms jump when cold level off once warm no hesitation


Not having an IAC would only affect idle speed. A rough idle could be a weak coil, or injector among other things. It takes more spark and fuel to fire a cylinder when the engine is cold.
Are you getting a trouble code for any one cylinder ?

Dec 20, 2015 | Ford Cars & Trucks

1 Answer

Adjust the clutch linkage on a pontiac 2002 trans am 6 speed


How to adjust clutch??? 95 bird. - Fourth Generation Pontiac ...

www.firebirdnation.com/forums/.../65178-how-to-adjust-clutch-95-bird/
Dec 5, 2008 - posted in Fourth Generation Pontiac Firebird (1993 - 2002): I have ...Year: 2000; Make: Pontiac; Model: TRANS AM; Engine: 5.7L LS1; Transmission: MANUAL 6 SPEED T-56 ... Have you looked at your clutch master cylinder. Throttle is sticking after acceleration - Fourth Generation ...
Oct 7, 2011
1 Problem / Few questions - Fourth Generation Pontiac Firebird ...
Mar 26, 2010
Firebird Technical Service Bulletins - Fourth Generation Pontiac ...
Jul 5, 2006
TECH ARTICLE MASTER INDEX Look Here - Firebird Nation
Aug 18, 2004
More results from www.firebirdnation.com

How to Install Clutch 98-02 LS1 F-Body Part 1 of 2 - YouTube

? 12:31
www.youtube.com/watch?v=4BCHu2BwBMs

Apr 12, 2013 - Uploaded by MapleBoarder78
Part one of installing a new clutch on my 2000 Trans Am. Part 2 will include installation ... How to Master Cylinder Install and Drill Mod (LS1 F-Body) - Duration: ... 6:28. Removal and Servicing ofClutch Master Cylinder to Slave Cylinder ... LS1 98-02 Chevy Camaro Z28 SS Pontiac Firebird Trans Am F-Body ...

Nov 02, 2015 | Pontiac Cars & Trucks

2 Answers

Idles rough and rmps jump while driving.


You may want to have the throttle position sensor tested. You should be able to buy a Haynes or Chilton manual for directions. A new one TPS is only $60.00. Test before you replace.

Jun 06, 2013 | 1992 Toyota Camry V6

3 Answers

Hi I drive a 2006 corrolla with 70,000 miles. I noticed the idle slowly but surely gettin a litttle rough and lower. This only starts to happen after I have been driving for about 5 min. It usually happens...


It's been almost 2 years since you posted the question so it's likely you will not see my answer to your question.

First, do NOT make any adjustments to your throttle body idle setting. The screw most likely never budged since 2006 so you should not touch it since this is not the root cause. But yes it is wise to check all vacuum lines as "craig" suggested.

I have a 2007 Corolla CE, 1.8 liter VVT engine, 5 speed manual transmission which I bought new from the dealer. Currently has about 108k miles on it. After about 4 or 5 years in cool to cold weather it started doing the same thing. I researched it online then asked my local Advance Auto Parts person who confirmed my hunch. It is known as "idle hunting" when the engine is cold, in colder outside temperatures the idle rpm's will increase up to roughly 2000 rpm then drop to idle, then back to 2000 rpm, then repeats multiple times. Then after driving a short distance, stopping and running at idle, the idle speed may drop to 600 or 500 or as low as 400 rpm, running quite roughly but still keeps running. My Corolla normally idles smoothly and steadily at 800 rpm when warm or hot. The idle hunting or low idle rpm will typically correct itself when the engine warms up enough.

The problem: the intake manifold gasket has aged and shrunk a bit, allowing engine compartment air to get pulled directly past the gasket and into the cylinder head intake port. This causes an imbalance between the reduced air filter airflow sensed by the Mass AirFlow (MAF) sensor versus the actual air/fuel ratio versus the engine rpm versus the oxygen level in the exhaust stream. The gasket will shrink more as the temperature under the hood drops, allowing more air to flow past the gasket. The Engine Control Unit (ECU) is simply trying to do its job as programmed by increasing fuel delivery to compensate for the overall imbalance, then when rpm's get too high it will reduce fuel delivery.

The solution: purchase a new intake manifold gasket for roughly $10 to replace the stock gasket. Mine is a thin orange polymer gasket with round cross-section which seals around all 4 intake ports. You can search for instructional video of how to install it on YouTube.

I purchased one but did not install it yet. I am sure this will resolve the problem since all other suggested fixes I found on the internet did nothing but unnecessarily frustrate the owners.

Apr 03, 2011 | Toyota Corolla Cars & Trucks

1 Answer

I have a rough idle at low rpm almost feels like it wants to stall once it reaches normal operating temp it improves some what I think its the EGR or spark knock 2000 Ford Taurus 3.0L V6


It could also be a vacumme leak. A quick way to check for that is to starting fluid around hoses and gasket areas. If the engine picks up speed when you spray around the engine and not directly in the throttle body, you have found your leak. I also believe these cars have an idol air control valve or IAC that might need to be cleaned or replaced. Check your spark/coil wires while you are checking around.

Mar 05, 2011 | 2000 Ford Taurus

2 Answers

1993 ford escort with manual transmission. When the gas pedal is released the engine does not automatically slow down. It does slow down after a minute or two. Is there a spring that needs to be replaced?


There are usually return springs but it could just be that your car coast a long time when in high gear before it starts to slow down. My Jeep is the same way, if I'm running at 55 I can coast for a few miles before I slow down very much.

Jun 11, 2010 | 2000 Ford Escort

1 Answer

1989 pontiac firebird 305 v8 starts and idles


Your idle air control valve may be dirty or the wire harness may be damaged. First try cleaning the throttle body with throttle body cleaner and make sure you use all the can up and try to get the idle air control valve cleaned. A faulty or dirty idle air control valve will cause engine to stall when put in to gear from idle. Good luck and hope this helps. Keep me posted, be glad to help you get your car running 100% soon.

Aug 08, 2009 | 1997 Chevrolet Cavalier

2 Answers

Car dying when letting off gas


Sounds like it's your IAC (idel air control sensor).  The IAC is a computer-controlled air bypass valve located in the throttle body. It helps control idle speeds by allowing air to bypass the throttle plates as to increase the idle speed.  If the IAC isn't working properly the car will stall when you are not pressing the gas pedal.  It is located on your throttle body and is relatively cheap and a simple change since it is normally held in my two screws.  Let me know if you have any other questions.  Thanks for an honest ranking and for using FixYa!

May 20, 2009 | 1997 Buick LeSabre

2 Answers

1999 S10 Blazer 2WD 4.3L V6. Starts hard, idles rough.


you have a single injector under the intake plenum it has 6 branching fuel leads off of this.A very common problem is the regulator attached to this and it leak off fuel which falls into the intake .causing this problem. it needs to be replaced .i have done at least 80 of these in my career.this will fix your problem.thanks for choosing fix ya

Mar 04, 2009 | 1999 Chevrolet Blazer

Not finding what you are looking for?
2000 Pontiac Firebird Logo

312 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

60960 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21949 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6812 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...