Questions related to the engine running without advancing the throttle.

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19
votes
1answer
487 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 ...
11
votes
3answers
1k 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 ...
10
votes
2answers
129 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. ...
7
votes
2answers
336 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. ...
7
votes
3answers
3k 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
1answer
138 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 ...
6
votes
2answers
773 views

Do you need charged battery for car to Idle

I am planning to acquire a 2001 Mitsubishi lancer 1.5 the car runs perfect but the it has an almost flat battery, even the horn doesn't work unless driven around.(No starting Problem though weirdly) ...
6
votes
3answers
394 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
126 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
2answers
220 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
1answer
84 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
415 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
2answers
3k 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
56 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
0answers
50 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 ...
6
votes
0answers
65 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
349 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 ...
5
votes
2answers
373 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
2answers
5k 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
4answers
1k 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
511 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
214 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
323 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
1answer
30 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
3answers
2k 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
1answer
42 views

1997 Escort idles rough when a/c is off

Escort runs great with heater or a/c on. It runs rough and sometimes dies when they're off. What could be the problem?
4
votes
1answer
2k 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 ...
4
votes
4answers
1k 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
1answer
36 views

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

A Short Story So a friend asked me to look at a 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 test the ...
4
votes
0answers
242 views

Engine Running Fast in Park

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 ...
3
votes
2answers
68 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 ...
3
votes
2answers
1k views

2000 Ford Focus ZX3 stalls while idling

I’ve had this problem for a while now. When my car is warmed up, and I’m at a stop light or just idle when parked, the engine struggles to stay on. The RPM stays under 1000 and fluctuates a lot, ...
3
votes
1answer
175 views

Big motorcycles at stop lights; why do they keep blipping the throttle?

We've all been near a big Harley at a stop light, where the rider keeps blipping the throttle. I've always wondered why they do this. Is it because those big pistons don't idle very well, and if you ...
3
votes
2answers
598 views

BMW e36 wont maintain idle

A friend has an e36 that wont maintain idle. The car is driveable but coughs and stops when idling. I've checked the air box and boot and they are in good condition - no leaks. I think spark and ...
3
votes
2answers
1k 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. ...
3
votes
2answers
1k 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, ...
3
votes
2answers
58 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 ...
3
votes
1answer
31 views

after replacing icv,intake boot,valve cover gasket and return to stock air box from CAI,car will not hold idle 325i 1994

Car will not idle after re-installing stock air box from previous cold air intake. I replaced idle control valve also replaced intake boot as well as valve cover gasket along with spark plugs, BMW ...
3
votes
1answer
894 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 ...
3
votes
1answer
20 views

2000 mazda 626 v6

My Mazda shuts off when I apply the brakes. Can anyone help me with this problem. It idles just fine but when I apply the brake to put it in reverse it bogs down and completely shuts off. What could ...
3
votes
1answer
68 views

High idle, not shifting gears - 1995 Mercury Mystique

My friend has a 1995 Mercury Mystique that was suffering from low idle problems (stalling out at stoplights, etc). He replaced the throttle position sensor, and after that the low idle problem was ...
3
votes
1answer
46 views

1995 Mercury Sable 3.8l - 2300rpm at Starting Of Engine but Will Not Fall Below 1500rpms

This car is driving me absolutely batty. I have never had any problems with it before. The other day I drove my car to Vegas airport from Orange County (about 4 hr drive) and my car died on me 6 ...
3
votes
1answer
227 views

Falling RPM's and Stalls after Releasing the Clutch

Once my 97 Mazda 323 get's up to normal operating temperature, around say 90 C, the RPM's will occasionally nosedive after taking it out of gear, releasing the clutch and letting off the gas. What I ...
3
votes
2answers
386 views

Poor idle speed when engine is warm

I drive a Mitsubishi Eclipse 2000 2.4L. In the past few days my car has started to idle horribly when the engine warms up. While it is cold, the rpms seem to be normal except for a small fluctuation ...
3
votes
2answers
1k 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 ...
3
votes
0answers
36 views

Engine knocks and engine speed falls below idle upon releasing the throttle

I have this strange problem on my 1999 Volvo V40 1.9T T4 (B4194T engine, no VVT, ~150k miles), I'll try to provide a detailed description. I noticed that only when the engine is warm, whenever I ...
3
votes
0answers
37 views

'90 alfa 164 V6 3.0 12v bad idle when hot / hard to start / bad rev under 2000 rpm

I am getting a bad idle when the engine aforementioned is warm. Can somebody please help me troubleshoot this problem ? Here are the parameters when the engine is idling rough Any help will be ...
2
votes
2answers
2k views

2000 3.8 L Ford Mustang Cov

2000 Ford Mustang 3.8L //// Engine Vehicle Shakes entire front end of car when at idle, all the way up to 2,000 rpms then it goes away. Starts right up, had problems with a few computer codes fixed ...
2
votes
2answers
561 views

2003 Toyota Camry 300 rpm with AC on

I have a 2003 Toyota Camry 4 cylinder with the AC on it runs at 300 rpm and stalls. What could be my problem and is there anyways to adjust the idle?
2
votes
1answer
969 views

Mazda 3 2004 Engine Revving when car not moving

I recently noticed when my car comes to a stop engine running and ac on the engine revs as if it wants to move forward. The rev isn't huge. When i am in traffic and holding down on the brakes, if i ...