Questions tagged [idle]

Questions related to the engine running without advancing the throttle.

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23
votes
7answers
8k views

How slow ( not zero) can a car engine run without hurting engine and saving on fuel

New cars have stop-start system (even though this has been available for a long time). My question is: why are car companies emphasizing shutting the engine down at a traffic light, rather than making ...
19
votes
1answer
4k views

Vibration at idle, much worse after warm

My car is a 2001 Pontiac Firebird with a V6 (3800 Series II (L36)) and a manual transmission. These are all at a stop: When the car is cold, I don't feel too much vibration when sitting in it. (I ...
14
votes
3answers
5k views

How does the transmission not strip itself when applying the brake?

Quick question bugging me: Obviously the car moves forward when neither applying the brake nor the accelerator. How does this not damage the transmission when the brake is pressed? I first ...
13
votes
1answer
563 views

1987 Dodge D150 High Idle and Dieseling

Truck is the high altitude/California emissions model, 318. Carburetor has been replaced with a 4 barrel Holley 4160 I believe, although it might be a 4150, intake manifold was replaced to fit the ...
11
votes
1answer
136 views

Occasional trouble idling

I have a 2004 Subaru Forester XS (manual transmission). A few times a month, the engine will not start or idle without feathering the accelerator. During normal driving, everything works fine until ...
10
votes
2answers
1k views

Why Have More Than One IAC Type Device On an Engine?

I've had two Mazda's, a 97 323 and 98 626. On both these car's engines there was only a single IAC mounted on top of the throttle body, and no other device for adding air flow on the intake side. ...
9
votes
2answers
2k views

Do you need a charged battery for a car to Idle?

I am planning to acquire a 2001 Mitsubishi Lancer 1.5. The car runs perfect but it has an almost flat battery. Even the horn doesn't work unless the car is driven around. (No starting Problem though ...
9
votes
1answer
7k views

Idle gets stuck at 2000RPM

I have a friend with a 1989 Toyota Camry Wagon and the idle occasionally gets stuck at 2000RPM. In order to get the idle unstuck, we have to press down the gas, kick up the revs and then it will ...
8
votes
2answers
2k views

Why do engines run badly below the normal idle speed?

When the engine speed in my petrol car drops below about 650-700 RPM - the normal idle speed - it starts to shake and judder. This could be because say, I didn't give enough gas when pulling away. ...
8
votes
3answers
9k views

Does idle RPM increase when there is heavy load on the electrical system?

I am thinking about installing a 500w halogen (HDX brand) on the roll bar in my jeep as the dome light because often I work in the back when it is dark or when I would like more light. The 500w light ...
7
votes
2answers
3k views

Rough idle problems on 93 Miata

The engine idles fine when cold then drops to about 800 and I have no problems at all except maybe inconsistent idle (goes up and down but not by much) although when I turn off the engine and then ...
6
votes
3answers
2k views

Is manual start/stop good on older cars?

I have an old car (but with electronic injection) that predates by far start/stop systems which are used nowadays to save fuel (turning off the engine brings savings after 3-5 seconds, see Calculating ...
6
votes
2answers
7k views

RPMs jump to 2500 when clutch is disengaged or transmission put in neutral

Good morning all. I drive an 05 Chevy Cavalier, 2.2L, 5-spd manual trans. Lately I've been having issues which I am told is throttle related. As I'm driving for a little bit (time varies) I go to ...
6
votes
3answers
2k views

Car stored for 6 months shows low oil level after 300 miles

Just bought a car from a BMW dealer and the guy told me it was sitting for almost 6 months before I came to purchase it. When I left the dealership the oil was above the min mark showing green. Drove ...
6
votes
1answer
2k views

Yamaha Seca - Motorcycle Idle problems

My motorcycle (1982 Yamaha Seca 650) has had a strange problem with the idle for a few years now. I have not been able to diagnose it and I'm hoping that someone here might be able to help. It starts ...
6
votes
1answer
1k views

High vacuum pressure on idle after timing gear and chain replacement

I just got my 1980 Chrysler LeBaron 318 V8 back from the mechanic, who replaced the timing gears and chain, which were the originals and very worn. Soon after leaving the mechanic, I noticed my ...
6
votes
1answer
337 views

'96 Saab starts, stalls

My poor Saab 900 is having touble getting going. I was away for about a month, and got the oil changed before I left. When I came back, I drove the car to my grandmother's and back, about 15 minutes ...
6
votes
1answer
6k views

Jeep stalls after about 10-15 minutes driving or idling

1996 Jeep Grand Cherokee Limited This just started yesterday. Instance#1: After about 10-15 of driving (note: It had been about 12 hrs since it was last used) I was waiting at a traffic light when ...
6
votes
1answer
2k views

2005 Ford Taurus U Vin Unstable Idle, Charging System Problem?

A Short Story So a friend asked me to look at a 3.0 L Taurus at his shop. The car originally came in for a P0420 code and they put an anti-fouler on the rear o2 sensor. Whatever. During the road ...
6
votes
2answers
7k views

Really high idle after tightening spark plugs

I had a very nasty tick in my engine after doing a bunch of work to it, I just redid my chain tensioner which went a long way to fixing it, then I found that spark plugs could cause a tick, so I ...
6
votes
0answers
1k views

Vibration felt, heard and seen when in Drive at stop but disappears when shifted to Neutral [closed]

2010 Jeep Patriot FD2 4x4 38,000 miles Well maintained vehicle with low mileage. Excessive vibration noticed beginning 6 months ago. Have changed spark plugs, air filter, Premium gas used with double ...
6
votes
2answers
234 views

Idle drop in 1991 Buick Park Avenue

I have a 91 Buick park Ave that is experiencing these symptoms. When starting from a cold start the engine will turn over, reach around 1000 rpm, then die. When applying gas and turning the key the ...
5
votes
2answers
18k views

How does air get into the engine with a bad IAC?

My understanding of the IAC is that the idle air control valve basically supplies air to the cylinders/engine when the throttle body is completely closed/shut. Per wikipedia, "The ECU can control the ...
5
votes
3answers
11k views

Is it bad to idle the car for 5 min or restarting the car?

I know idling the car wastes gas but which is worse, idling for 5 min while I talk to my friend or turning the car off, talk for 5 min, and then restarting again? This can also be applied to idling ...
5
votes
2answers
5k views

A/C Temporarily Cures Low, Hiccupping Idle

I have a 99 Nissan Almera 1.6L MTX ( nearly identical to the Sentra sold in the US ) which has developed a problem with low idle, occasional stalling at stop lights, what seems to be misfires and ...
5
votes
5answers
8k views

2000 Dodge Ram 1500 won't idle

The battery died last week. After I jumped it I noticed the truck would only stay running if I was revving the engine. As soon as I take my foot off the gas rpm drops to 0 and the truck dies. ...
5
votes
1answer
883 views

Car dealer taking more time to repair. Is it ok to leave car idle for long time?

I have a 2010 Mazda 6 car. I received a letter for airbag recall. When I dropped my car for service they said it would take 1 hr to fix the airbag. Later they called me and said the parts are not ...
5
votes
1answer
8k views

Idle speed is wrong after replacing battery (2006 Camry)

I have a 2006 Toyota Camry. I replaced the battery the other day which I noticed was getting weak. The battery was disconnected all of 10 minutes. After, it idles too low. It shudders pretty bad and ...
5
votes
1answer
4k views

2005 Honda Accord cold start idle is low

I'm not a car expert so I don't know if I'm being alarmist or not but this problem just started happening the past week and seems to be getting worse fast. Hopefully the terms I'm using is helpful in ...
5
votes
4answers
2k views

Engine repeatedly dies at shorter and shorter intervals this cold morning, finally won't start

I have Pontiac Grand Am 2004. It's been needing some regular maintenance, but other than that runs mostly fine. When I went out to start it this morning, it started fine. I went to start brushing snow ...
5
votes
0answers
513 views

What causes more gas consumption - Idling with AC or Heat? [duplicate]

So I have begun doing some research on the effects of idling. So my question is, does idling with the AC or heater on affect how much gas is given off? If possible, please give the percent of extra ...
5
votes
0answers
484 views

High Idle and Engine Noise in Chrysler 300c Hemi [closed]

I recently bought a 300, it had 170000 miles on it. When I test drove it nothing felt wrong what so ever. Week later it started turning off by itself in the middle of the freeway or alleys. Got it ...
4
votes
2answers
240 views

Automatic transmission sticking after car has not been driven for 3 months

My car has not been driven for a while and it is having trouble and sticking when shifting gears. Should I continue to drive it and will this problem fix itself or is there something I can buy like an ...
4
votes
1answer
2k views

Idle dipping and rising when headlights are on - not Idle Air Control Valve

On my 1993 VW Mk1 Cabriolet I've been trying to find an issue that causes the idle to rise and dip (to near stalling levels) when power is being drawn (in this case, when the headlights are on - there'...
4
votes
2answers
4k views

2002 Ford F-150 idle problem

Ok once in a while when I turn on my 2002 Ford F-150 the RPM's go from 1000 to 800 then back to 1000 over and over and this is at idle. I haven't gone to get it looked at and I want to see if it's ...
4
votes
2answers
7k views

Power Steering non functional at idle

Replaced a leaking power steering pump in my 99 Nissan Maxima about a month and a half ago. Bought the new pump from NAPA, used NAPA branded power steering fluid. My buddy and I switched out the pump, ...
4
votes
3answers
12k views

Unable to accelerate after jump starting

I apologize in advance for the long question. I want to make sure I'm as detailed as possible. Today I discovered my Toyota 2009 Venza completely dead (kids left the rear passenger lights on... I ...
4
votes
2answers
3k views

High idle while coasting in neutral

I have a 1999 Chevrolet Camaro with a 5.7 liter engine and a manual transmission. It recently started idling high but only when coasting. If I slow down because of a stop sign or whatever and hit ...
4
votes
2answers
318 views

Engine missfires when idling, but only when hot

I have a 1988 Toyota Corolla EE80 that I bought recently, 1.3L carburetor engine with distributor ignition. The engine idles normally at around 1500rpm idle when it's cold. But the moment the coolant ...
4
votes
1answer
67 views

How to increse Idle Air OR Gas - 1986 ford ranger

I have a 1986 for ranger that sounds sluggish on idle not bad just not great. If I push a little on the gas the idle sounds perfect. I am wondering how I can achieve the same affect automatically?
4
votes
4answers
6k views

Mini Cooper P1638 code

I have a 2007 Mini Cooper. It keeps throwing code P1638 on my code reader on these really really cold mornings, and the engine seems to search for idle, reving betwween 500RPM and 1400RPM. The car ...
4
votes
3answers
4k views

Extremely high then fluctuating idle at very cold temperatures

Twice in the past month my 92 Civic has exhibited really bad idle behavior in temperatures around 10-20 degrees F. When first starting the engine, it idles at something like 2000-2500 RPMs (by ear; no ...
4
votes
4answers
2k views

Toyota camry 2003 , 2azfe - 2.4 L , vibrates at idling & does not accelerate properly

Recently I sent my Camry to the workshop as there was a blown water outlet pipe, and was told that the head gasket was damaged too. These were then replaced, and I took delivery of my car. But my ...
4
votes
3answers
644 views

2005 WRX Idle RPM Increasing in Traffic

My car is a 2005 Subaru WRX Wagon. It has 120 000 miles and has had all the regular servicing. Last night I did some highway driving and then hit stop/go traffic. After about 10 mins in the ...
4
votes
3answers
5k views

High idle on fuel injected motorcycle

So my bike has a high idle (gone up as far as 6k revs sometimes). There are no air leaks and the throttle freeplay is fine and cables all nice and free. Clutch is fine also. The fuel lines and ...
4
votes
3answers
3k views

2005 Mazda 3 2.3L rough idle

My 2005 Mazda 3, 128,300 miles and manual transmission, has been running well for quite a while but a couple of weeks ago it started idling rough/low once warmed up and even stalled a few times when I ...
4
votes
2answers
49k views

Resolved: Idle RPMs fluctuate and engine hesitation

I am kind of stumped. I have a 1996 Toyota Rav4 that is acting weird. Let me start with the list of recent repairs. I gave it: a tune-up (new sparks, wires, distributor cap and rotor) changed the ...
4
votes
0answers
297 views

Temporarily increasing electrical load almost kills engine

I have a 2001 Ford Focus that has some funky problems at idle under load. A nice high-load scenario is by abusing the windows motors (rolling them up while windows are up), which causes the RPM to ...
4
votes
0answers
961 views

Can carbon buildup on a valve seat cause idle surging?

I've got a 1994 BMW 325iC that won't pass smog (for more details, see this thread). I took it to a shop to get both a leak-down and compression test done with some interesting numbers: Cylinder 1 ...
4
votes
0answers
2k views

Engine Running Fast in Park [closed]

Never had this issue before but I just started my vehicle and the tac automatically revved up to 1500 rpm when I cranked it. It didn't go back down while in park, it basically idled at about 500 rmp ...