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Engine skips under load - 2008 BMW X5 4.8i

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2002 ford taurus runs rough and skips with a/c on.


AC puts a load on the engine and a weak ignition system is most likely to misfire when under load. Check out your spark plugs, wires and fuel system.

Jun 27, 2017 | Ford Cars & Trucks

Tip

How to Diagnose Your Engines Skip


Sometimes it's easy to tell if your engines got a skip. Other times its not so evident that a skip is what's causing your engine problems. Even when your know its a skip, deciding on which cylinder is the problem. This how to makes finding that problematic skip easy as pie.
Instructions
Things You'll Need:
infrared thermometer
Step 1
First thing you need to do is get yourself a infrared thermometer. Sounds fancy but they are not all that expensive, you can find them for under 50 dollars. These things are handy for so many things, trust me you will wonder how you ever got along without one.

Step 2
Now you'll be putting the laser of the thermometer on the exhaust headers where they meet up to the head so make sure you have a line of site to all of your header pipe ends. This works on manifolds as well but not as good. Its still the easiest way to find a skip either way.

Step 3
Now just locate the skip. To do that start the engine and quickly go under the hood with your infrared thermometer. Check each cylinder temperature, the cylinder with the skip will be cooler than the others around it. This works great because it will show you if you have a dead skip or just a cylinder that is running a little cold, all in a matter of mins. Information like this is very valuable for fine tuning and getting the most out of your engine.

on Jan 31, 2010 | Audi 318 Cars & Trucks

1 Answer

Idle misfire a skip up hill


Check engine codes for misfire data--should say which cylinder.

Oct 20, 2014 | 2003 Ford Thunderbird

1 Answer

2000 Ford mustang. engine skipping and check engine light flashing. I have checked plugs and wires and they seem fine.


It sounds like you have a misfire. Does it miss more under a load or does it miss primarily,at idle. If under load, it is likely ignition related. Spray water on the wires and coils with the engine running. If they are carbon tracking it will be very obvious as the engine will miss worse.

Jun 25, 2014 | Cars & Trucks

2 Answers

How do I find the spark plugs and plug wires so I can replace all on my 02 Ford Crown Vic (I have a skip under load)


I THINK I UNDERSTAND THE SKIP UNDER LOAD,LOL,BUT THIS CAR DOES NOT HAVE WIRES,IT HAS BOOTS,UNDER THE COIL PACKS,AND I HATE TO TELL YOU THIS,BUT,IF IT IS A 4.6 LITER,THEN,FUEL RAIL HAS TO BE LIFTED,GOOD LUCK

Apr 05, 2010 | 2002 Ford Crown Victoria

1 Answer

2002 Ford Windstar p0300 skips and backfires under load


Just put a coil on a 2002 today. Coils fail a lot with no codes given

Mar 09, 2010 | 2002 Ford Windstar Cargo

1 Answer

Engine runs extremely rough, seems to be fuel related, new fuel pump & filter installed, pressure good, run 2 bottles of injector cleaner through. Can't get to stay running under load. 1998, chev....


Have you changed the plugs, if any are fouled out or if any are worn, it takes more to fire it under load and may be spark knocking because one of the plugs can't fire off all the gas and cause it to skip or idle rough.

Jan 18, 2010 | 1998 Chevrolet K1500

1 Answer

Engine skips


That sounds like a dirty EGR valve...I had the same problem. Change the EGR valve and your problems shall be gone.

Jan 12, 2010 | 1995 Cadillac DeVille

1 Answer

I have a 4.3 and 5 speed 4x4, the engine will miss under load, new gas tank and sending unit installed, looking at replacing fuel filter, any other ideas?


If you are missing, due to a cylinder failure, the fuel filter, sending unit and all of that affect all of the engine. If you get a "skip" under a load, you have a cylinder issue. You need to determine what cylinder. Try to throttle it up while applying the brake to keep it from moving in drive to see if you can get it to skip.
If it does, look at spark plugs to see if you can see what cylinder looks different.
Or...while someone is "power braking" and it's missing, remove a spark plug wire one at a time to see if the condition changes. If it doesn't change, that is your bad cylinder.
Then you need to determine if it's fuel, or spark that is the problem.
(Injector bad, or plug, or plug wire.)

Jan 11, 2010 | 1995 GMC Sierra

1 Answer

Skipping


it sounds like a secondary ignition problem if it only skips under load it is probably plugs and or plug wires

Oct 13, 2008 | 2001 Oldsmobile Alero

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