Question about 1986 Ford Bronco II

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2.9 rough idle/lopes when LR/1st gr

Slow to start, idles rough (misses) has new plugs, battery, starter, in tank fuel pump

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  • Anonymous Mar 24, 2014

    diesel sounds like it has a misfire

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I did all that to mine, eventually I pulled off the Idle air control or IAC took it apart and cleaned it with carb cleaner and it worked, idled good, it has worked for longer than a year. cost-$5.00, 1 hour.

Posted on May 01, 2009

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Presumably you mean slow cranking. Check for weak battery or bad starter.

If not slow cranking so much as long cranking time check for loss of fuel pressure overnight using fuel pressure gauge. If so, suspect leaking injector or possibly leaking regulator.

Posted on Jun 23, 2008

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1993 gmc suburban rough idle, stall in reverse


Idle air control (IAC) control rpm idle during idle.

Test it on idle with ALL electrical on full force.
RPM should increase.
If RPM remain the same then IAC is question.

Jan 13, 2014 | 1993 GMC Suburban

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Rough idling/loping at idle it otherwise runs fine off idle.


1. Vacuum leakage Check throttle body and intake manifold for tightness. check all vacuum hoses.
2. Faulty fuel or pump or electrical.
3. Plugged PVC valve.
4. Air filter clogged
5. Leaking head gasket.
6. Camshaft lobs worn.
All of these porblems can cause lopes or erratic idle.

Apr 14, 2011 | 1993 Chevrolet S-10 Blazer

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Engine idles rough at red lights begins loping rpms drop to almost killing, then cycles back to normal, then repeats rough idle drop in rpms and loping, back and forth until I rev engine or take off


You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.

Mar 02, 2011 | 2001 Nissan Altima

2 Answers

92 Ford F150 4.9L. starts good, idles rough, dies at slow speeds


4.9 litre ?? you having a laugh its a 10ton truck engine not a pick up -global warming machine,remove the pump/sender unit and check the gauze filter also look inside tank for a something floating around ,i think the idles is not a related problem to the vehicle losing power but their is a possibility you could have a problem with the little vac operated thing on the fuel injector line that allows the fuel through only when the engine is running

Mar 15, 2010 | Ford F-150 Cars & Trucks

1 Answer

Loping idle with a '98 Subauru 2.5


This usually happens when the fuel pump is loosing pressure.

I will just advice you make a replacement on the fuel pump. It is located in the fuel tank beneath the back seat.

Be sure to consider the rating on the fuel pump when replacing.

Good luck and rate my solution.

Dec 03, 2009 | 1998 Subaru Legacy

1 Answer

Bought 5.0 engine with systemax installed. Said it ran great. I installed the engine and just put the a 255LPH fuel pump in. Adjusted fuel regulator to 42 PSI. Runs REAL ruff. Won't idle by itself. Black...


I think your 88 mustang contols the fuel air mix with a manifold absolute pressure sensor. Ive seen were the vacume line going into one has worked loose or broken cousing rough idle and throttle. llso check that the idle air control valve isn't plugged up with soot. This would also result in rough or loping idle but would be fine once the engine is hot. Let me know if this was helpful, good luck.

Mar 15, 2009 | 1988 Ford Mustang

1 Answer

Start and stop


Top candidates for this problem are:
Clogged Fuel filter
Faulty Fuel pump
Clogged fuel injectors
Dirty / worn spark plugs

Of these, only the clogged fuel injectors are likely to respond to a gas tank additive, and even then you need to get the right kind of additive.
If your fuel filter has not been changed in a while (couple years), start with this. It is fairly easy to change. The fuel filter is under the car near the the driver's side rear door.
If this problem started "suddenly," then the fuel pump might be the culprit.
Fuel injector / spark plug issues are not likely to stop the engine right away, but would tend to cause it to miss cylinders, idle rough, or start rough.

Mar 08, 2009 | 1985 Oldsmobile 98

1 Answer

1999 F250 4x4 Rough idle, miss when warm. No CEL.


I know this will sound Stupid But, Change the Cap Cap. If the Seal is Bad on the Cap it will allow air Into the Fuel tank and Cause your Rough Idle.

Jan 23, 2009 | 1999 Ford F250 Regular Cab

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