What are the causes of rough to no idle on a 1979 ford bronco with a 400 cid stock engine. Motor will not idle on it's own

Question 1

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2answers

Rough Idle when starting when motor is warmed up

My brother has a Ford F150 that does this the problem turned out to be a bad mass air sensor (little black box with plug in on it located next to the air box on the air intake pipe

Jan 29, 2014 • Ford Bronco Cars & Trucks

0helpful

1answer

What caused my battery to boil over in my 79 bronco, has a 400 engine

the voltage regulator is at fault and it's killed your battery sorry

Jun 01, 2012 • 1979 Ford Bronco

0helpful

1answer

I have a 1995 ford bronco with a 302. When it idles in gear it idles rough and when driving 35 to 45 miles per hour it bucks real bad. I have changed the egr and the sensor on top of the egr. what else...

Hi, Guy! My 95 Bronco runs a little rough whenever one of the vacuum lines gets broken or disconnected. Because of the age, these plastic lines get brittle and break easily. Check them all. You might also want to look at your engine's dampener (behind the engine's main pulley). Sometimes the dampener becomes detached from the pulley and causes the engine to vibrate.

Dec 31, 2010 • 1995 Ford Bronco

3helpful

1answer

2000 ford expedition ,,rough idle in park..rough idle in drive,, sometimes dies..rpm's in drive at idle 400...replaced iac

Check the fuel pressure at the rail assembly, there should be a min of 40 lbs at the rails. Do you have any loss of power under a load? You may have an issue with your o2 sensor that is causing the ecm to send an improper signal to the engine ign/fuel map.

Dec 07, 2010 • 2000 Ford Expedition

1helpful

1answer

1996 ford bronco 5.8 litre, auto, engine idle has

Do you have a check engine light on? First thing I would do is unplug the IAC motor when the engine is warm. If the idle speed doesn't change you have a vacuum leak or a bad IAC motor. If the idle speed goes down you might have a bad TPS or IAC

May 31, 2010 • 1996 Ford Bronco

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1answer

I have a 89 bronco 2 with a 2.9 engine. I have

Try replacing the Throttle Positioning Sensor
Have the codes checked
You may need to clean the Mass Air Flow Sensor
this is best done by a professional as it contains some very sensitive wires and they are easily broken
The MAF is very expensive to replace

Mar 29, 2010 • 1986 Ford Bronco II

1helpful

1answer

I need to know what the timing would be for a 79 ford 400 cid engine I have a f350 that badly needs timing done thanks chuck

6 degrees before tdc

Jul 07, 2009 • 1979 Ford F 350

1helpful

1answer

1979 Lincoln Continental Town car has a rough idle (400 cid). I have checked the timing and replaced the spark plugs and wires along with cap and rotor? What else could cause a smooth idle then a heavy...

I"d lean toward the dirstributor itself. You were right to check the timing but a balky distributor would cause occaisional mis-fires. Apart from that, the timing chain itself would be the next likely culprit.

Jul 06, 2009 • 1997 Lincoln Continental

1helpful

1answer

Will not run at an idle

Try this, it is the common reason for this problem.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

May 22, 2009 • 1987 Ford Bronco

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1answer

Engine idles to fast and runs rough

you can check timing, or check for vacuum leaks

Oct 12, 2008 • 1989 Ford Bronco

Question 2

Dan Pope

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Posted on May 11, 2014

Dan Pope

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Look for a major vacuum leak.

Answer 2

Serge Duguay

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Posted on May 12, 2015

Serge Duguay

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Vaccum leak

Answer 3

Rod Parker

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Posted on May 14, 2014

Rod Parker

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Your carbarater is the problem

Answer 4 · 10/25/2008 12:00:00 AM

A

Anonymous

Posted on Oct 25, 2008

SOURCE: rough idle; engine light appeared

I had that problem with my 2005 FX4 turned out to be a coil on #6 cylinder I replaced the coil my self and the light went out coil was $58.00.These trucks are sensitive to water in the gas you may want to add gas line antifreeze or isopropyl alcohol to your gas every other tank to displace any water which may be getting in there.

Anonymous

43 Answers
Posted on Jan 06, 2009

SOURCE: 1993 Ford Explorer idles rough when engine is warm

try changing distributor cap & coil

Anonymous

4 Answers
Posted on Apr 23, 2009

SOURCE: i have a 1988 ford bronco full size xlt it is ideling low when u

I just had the same issue with my 88 xlt w/351 W it wound up being the MAP sensor and the timing. I would check both of these and see if it solves your issue.

Anonymous

3 Answers
Posted on Dec 19, 2009

SOURCE: FORD WINDSTAR 3.8 V6 ENGINE IDLE ROUGH UP AND DOWN WHEN STANDING

Idle air control valve is the problem. "idle motor" tap it with a hammer it should temporarily solve your problem. it is right on top by the throttle body.

Boneebone

973 Answers
Posted on Jun 01, 2010

SOURCE: i have a 2000 ford focus, when it runs or idles

http://search.aol.com/aol/search?query=2000+ford+focus+does+not+want+to+idle+for+a+long+time.&invocationType=msie70a

Answer 5 · 10/25/2008 12:00:00 AM

A

Anonymous

Posted on Oct 25, 2008

SOURCE: rough idle; engine light appeared

I had that problem with my 2005 FX4 turned out to be a coil on #6 cylinder I replaced the coil my self and the light went out coil was $58.00.These trucks are sensitive to water in the gas you may want to add gas line antifreeze or isopropyl alcohol to your gas every other tank to displace any water which may be getting in there.

Answer 6 · 1/6/2009 12:00:00 AM

Anonymous

43 Answers
Posted on Jan 06, 2009

SOURCE: 1993 Ford Explorer idles rough when engine is warm

try changing distributor cap & coil

Answer 7 · 4/23/2009 12:00:00 AM

Anonymous

4 Answers
Posted on Apr 23, 2009

SOURCE: i have a 1988 ford bronco full size xlt it is ideling low when u

I just had the same issue with my 88 xlt w/351 W it wound up being the MAP sensor and the timing. I would check both of these and see if it solves your issue.

Answer 8 · 12/19/2009 12:00:00 AM

Anonymous

3 Answers
Posted on Dec 19, 2009

SOURCE: FORD WINDSTAR 3.8 V6 ENGINE IDLE ROUGH UP AND DOWN WHEN STANDING

Idle air control valve is the problem. "idle motor" tap it with a hammer it should temporarily solve your problem. it is right on top by the throttle body.

Answer 9 · 6/1/2010 12:00:00 AM

Boneebone

973 Answers
Posted on Jun 01, 2010

SOURCE: i have a 2000 ford focus, when it runs or idles

http://search.aol.com/aol/search?query=2000+ford+focus+does+not+want+to+idle+for+a+long+time.&invocationType=msie70a

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What are the causes of rough to no idle on a 1979 ford bronco with a 400 cid stock engine. Motor will not idle on it's own

3 Answers

Dan Pope

Serge Duguay

Rod Parker

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Anonymous

Anonymous

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Rough Idle when starting when motor is warmed up

What caused my battery to boil over in my 79 bronco, has a 400 engine

I have a 1995 ford bronco with a 302. When it idles in gear it idles rough and when driving 35 to 45 miles per hour it bucks real bad. I have changed the egr and the sensor on top of the egr. what else...

2000 ford expedition ,,rough idle in park..rough idle in drive,, sometimes dies..rpm's in drive at idle 400...replaced iac

1996 ford bronco 5.8 litre, auto, engine idle has

I have a 89 bronco 2 with a 2.9 engine. I have

I need to know what the timing would be for a 79 ford 400 cid engine I have a f350 that badly needs timing done thanks chuck

1979 Lincoln Continental Town car has a rough idle (400 cid). I have checked the timing and replaced the spark plugs and wires along with cap and rotor? What else could cause a smooth idle then a heavy...

Will not run at an idle

Engine idles to fast and runs rough

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1979 Bronco

Rough Idle when starting when motor is warmed up

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Related Topics:

What are the causes of rough to no idle on a 1979 ford bronco with a 400 cid stock engine. Motor will not idle on it's own

3 Answers

Dan Pope

Serge Duguay

Rod Parker

5 Related Answers

Anonymous

Anonymous

Anonymous

Anonymous

Boneebone

Add Your Answer

Attachments: Added items

Related Questions:

Rough Idle when starting when motor is warmed up

What caused my battery to boil over in my 79 bronco, has a 400 engine

I have a 1995 ford bronco with a 302. When it idles in gear it idles rough and when driving 35 to 45 miles per hour it bucks real bad. I have changed the egr and the sensor on top of the egr. what else...

2000 ford expedition ,,rough idle in park..rough idle in drive,, sometimes dies..rpm's in drive at idle 400...replaced iac

1996 ford bronco 5.8 litre, auto, engine idle has

I have a 89 bronco 2 with a 2.9 engine. I have

I need to know what the timing would be for a 79 ford 400 cid engine I have a f350 that badly needs timing done thanks chuck

1979 Lincoln Continental Town car has a rough idle (400 cid). I have checked the timing and replaced the spark plugs and wires along with cap and rotor? What else could cause a smooth idle then a heavy...

Will not run at an idle

Engine idles to fast and runs rough

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1979 Bronco

Rough Idle when starting when motor is warmed up

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