The engine is sometimes loping when idling but other times it is fine when i hit the brakes to stop some times the engine will idle down like its going to stall then way up and actually lurch the car forward and it has stalled a few times while driving mostly while turning it had a code that says MAF a low circuit input but i replaced the MAF and it is still the same i replaced the fuel filter and added dry gas and injection cleaner i have tried the throttle position indicator and the idle control valve from my dads car which is the same make model and year 2000 chevy impala base 3.4 and it did not change any thing i have checked for vacuum leaks and found a couple but after i fixed them still no change in the problem i am really confused and frustrated as oi can not figure out what is wrong with my car pleaze help

Question 1

0helpful

1answer

When driving u 1996 chevy tahoe I come to a stop light r stop sign are just push on the break the rpm go down an times it catches stays on n ones it shuts down it will start back up every time but when I...

yes
what you have indicates a faulty brake booster allowing excessive into the manifold and up setting the air/fuel ratio for idle
simple check is to start the engine with the hand brake on
idles ok then put your foot on the brake --problem -replace the booster

Jun 18, 2018 • Cars & Trucks

0helpful

1answer

'96 Mystique 2.0 trouble with idle. replaced idle mixing valve. I don't get any codes, I have to shift to neutral at a stop sign or light to keep from stalling. It gets real rough almost a lope.

troubles at lights may very well mean a vacuum leak from a faulty brake booster
test by stopping and then applying the park brake and taking your foot of the brake pedal
you can do this test in the garage
start the engine , apply the park brake , place in drive
if it idles alright , put you foot on the brake
if it plays up , replace the brake booster

Jan 24, 2017 • Cars & Trucks

1helpful

1answer

1992 fuel injection 2.6 idle high and loping?

The brake and ABS lights could be on because of a brake or ABS problem. The ABS system uses the hydraulic brake system in addition to the ABS components.
The high idle could be a vac leak or a problem with the idle air control valve. You could check the computer for trouble codes even if the warning light does not stay on.

Jan 21, 2013 • 1994 Isuzu Pickup

1helpful

1answer

I drive a w201 1.8 engine manual trasmission. The problem is some time the engine stop to run when i hit the clutch to free the engine and some time snot stop. What was happen to my car. I also change the...

give the motor a tune-up. new plugs and wires. also the idle control valve needs testing unless that is the part you changed already. The car won't strop easily with the engine shut down because the brakes are no longer powered.

Mar 09, 2010 • 1992 Mercedes-Benz 190

1helpful

1answer

Engine lopes, idles way up then back down. Very difficult to depress brake pedal

maybe a problem with your brake booster or brake vacuam line, this would also cause eratic idleing. Can you hear an air leak?

Nov 22, 2009 • 1999 Mercury Cougar

1helpful

1answer

Engine speed hunts on idle. Auto trans slow shift.

The fast idle valve is inside the throttle body. Sometimes it backs out and needs turned back in (it's threaded). This will cause the loping idle.

Get transmission filter changed with new fluid. Honda does not recommend transmission flushing.

Sep 17, 2009 • 1988 Honda Accord 4 Door

1helpful

1answer

My engine started idling very high. It is actually loping.

It sounds like there could be a problem with the idle air control valve, but if the check engine light is on, take the car to an autoparts store and have them scan the computer for any fault codes that are stored. Most parts stores will scan the computer for free. Getting the fault codes will help identify the source of the problem. Hope this helped and best wishes.

Jul 27, 2009 • 2001 Chrysler Town & Country

0helpful

1answer

Surge in idle when brakes applied or after driving..

block off vacuum hose to brake booster and see if idle returns to normal if it does you need new brake booster has hole in diaphram internally some times slight hissing noise is evident in cab when pressing brake pedal to section where engine surges or idles high. also check for fuel leaks from hoses if you can smell fuel in engine bay while running and engine warm some leaks only leak while running and hot

Jun 14, 2009 • 1992 Nissan 300ZX

0helpful

1answer

Idle irradic

could be either EGR valve stuck open or the IAC(idle air control)

Apr 21, 2009 • 1995 Jeep Grand Cherokee

0helpful

2answers

89 Toyota pickup erratic idle when warmed up

its a vacumm guys check all your hoses with a carb cleaner while engine on be carefull not to let it catch on fire with the spray ok give it a slight of puff of it with the spray ok!! remember truck hoses are old and cracking ..

Dec 29, 2008 • 1989 Toyota Pickup SR5

Question 2

Jeffrey Turcotte

Chevrolet Master 8,991 Answers
Posted on Jan 03, 2011

Jeffrey Turcotte

Chevrolet Master

Joined: Aug 22, 2010

Answers

8991

Questions

7

Helped

4370462

Points

33683

Hi, you may have a torn brake booster diaphram. Try disconnecting the brake booster and plugging the hose with a rag. Don't drive it without the booster, but set the parking brake and see how it runs in the driveway. If this clears up the problem, replace the booster.

Answer 2

Anonymous

Master 1,165 Answers
Posted on Jan 03, 2011

Anonymous

Master

Joined: Dec 14, 2010

Answers

1165

Questions

0

Helped

383139

Points

3606

Here are a few things to check out. The intake ducting between the MAF and the throttle body must be air tight. Any air getting in that doesn't go thru the throttle body will cause idling problems and surging. Make sure the air filter is fresh. Replace the PCV valve, and finally, check the egr valve for leakage. Good luck. Hope this helps.

Related Topics:

2 Answers

Jeffrey Turcotte

Anonymous

Add Your Answer

Attachments: Added items

Related Questions:

When driving u 1996 chevy tahoe I come to a stop light r stop sign are just push on the break the rpm go down an times it catches stays on n ones it shuts down it will start back up every time but when I...

'96 Mystique 2.0 trouble with idle. replaced idle mixing valve. I don't get any codes, I have to shift to neutral at a stop sign or light to keep from stalling. It gets real rough almost a lope.

1992 fuel injection 2.6 idle high and loping?

I drive a w201 1.8 engine manual trasmission. The problem is some time the engine stop to run when i hit the clutch to free the engine and some time snot stop. What was happen to my car. I also change the...

Engine lopes, idles way up then back down. Very difficult to depress brake pedal

Engine speed hunts on idle. Auto trans slow shift.

My engine started idling very high. It is actually loping.

Surge in idle when brakes applied or after driving..

Idle irradic

89 Toyota pickup erratic idle when warmed up

Not finding what you are looking for?

2000 Impala

When driving u 1996 chevy tahoe I come to a stop light r stop sign are just push on the break the rpm go down an times it catches stays on n ones it shuts down it will start back up every time but when I...

Ask a Question

Check Out the Latest Top Trucks Report!

Top Chevrolet Experts

ZJ Limited

Ronny Bennett Sr.

john h

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

Manuals & User Guides

. 2000 Impala Manual

Related Topics:

2 Answers

Jeffrey Turcotte

Anonymous

Add Your Answer

Attachments: Added items

Related Questions:

When driving u 1996 chevy tahoe I come to a stop light r stop sign are just push on the break the rpm go down an times it catches stays on n ones it shuts down it will start back up every time but when I...

'96 Mystique 2.0 trouble with idle. replaced idle mixing valve. I don't get any codes, I have to shift to neutral at a stop sign or light to keep from stalling. It gets real rough almost a lope.

1992 fuel injection 2.6 idle high and loping?

I drive a w201 1.8 engine manual trasmission. The problem is some time the engine stop to run when i hit the clutch to free the engine and some time snot stop. What was happen to my car. I also change the...

Engine lopes, idles way up then back down. Very difficult to depress brake pedal

Engine speed hunts on idle. Auto trans slow shift.

My engine started idling very high. It is actually loping.

Surge in idle when brakes applied or after driving..

Idle irradic

89 Toyota pickup erratic idle when warmed up

Not finding what you are looking for?

2000 Impala

When driving u 1996 chevy tahoe I come to a stop light r stop sign are just push on the break the rpm go down an times it catches stays on n ones it shuts down it will start back up every time but when I...

Related Topics

Ask a Question

Popular Questions

What does the word CAL mean that shows on the dash

Shifter stuck in park!

Where is the evap vent valve soleniod located on

Where is the oxygen o2 sensor located on 2004

How to reset the airbag light on chevy impala 2009

Check Out the Latest Top Trucks Report!

Top Chevrolet Experts

ZJ Limited

Ronny Bennett Sr.

john h

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

Manuals & User Guides

. 2000 Impala Manual