Question about 1999 Toyota Land Cruiser

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Engine miss 2.7 ltr prado

This vehicle is one dual fuel i replaced the cylinde head 12 months ago i have done all basics eg compression test, new leads spark, plugs, rotor button. the miss comes and goes it is more noticeable under load and seems to be electrical

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There are many things that could cause a miss. And everything can be checked for.
A vacuum leak, like the EGR valve sticking, broken vacuum hose, intake manifold gasket, dirty fuel injector, dirty or worn spark plug or wire, low fuel pressure, bad injector.
Check the cheapest things first, like vacuum hoses and clean the EGR valve.
You should be able to pull the plug wires loose from the coil pack or distributor cap one at a time, and see which wire makes the least difference. Don't pull them off the spark plugs, or you may get a shock. Then swap that plug wire with a wire from a different cylinder, and see if the miss moved with the wire, which would indicate a wire problem, or if the miss stays at the same cylinder, in which case you should check that plug.
Good luck,

Posted on Jan 19, 2009

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Hi and welcome to FixYa,

On hard to find miss problems, one test that can be performed is do the a check at night in a darkened area. The idea is to start the engine, open the hood and look for any arcing, sparks jumping. Another method is to use an AC test light with small neon bulbs Like this example. The neon test bulb would glow when near an arcing high voltage. Pls exercise caution when performing this test.

Pls post back result(s). Good luck and Thank you for using FixYa.

Posted on Jan 19, 2009

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Coil pack overheating

Posted on Jan 19, 2009

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Have a 1999 Jeep Wrangler 2.5 Engine


  1. Ensure you have spark.
  2. Ensure you have fuel to the cylinders
  3. Ensure you have compression in the cylinders
If you are missing spark, check the connections to the distributor and to the crankshaft position sensor.
If you are missing fuel, verify that the fuel pump is operating.
If you are missing compression, you didn't do something right when you installed the timing chain or installed the head.

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How do I go about removing a 1992 Toyota engine from the vehicle so I can overhaul or rebuild ?


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Car turns over but won't start. Boyfriend checked the spark plugs , says vetting spark. It says he did a compression check to it. Starter is a year old, battery new, we replaced fuel pump 3 weeks ago...


A thumb is not test for compression as 10lb/sq " will blow your thumb off. Have a proper compression test done. Next although it is sparking the question to ask is it sparking at the right time and to the right cylinder. Pouring fuel into the cylinder is a waste of time as the air/fuel ratio will be too rich to ignite even if the spark was occurring on the compression stroke. So here are some simple steps to follow to get it going
Have a compression test done to determine if there is sufficient compression to ignite the mixture
2 check that the spark is occurring at the cylinder at the right time ( no 1 cylinder on timing mark on compression stroke.)
3 . If it is EFI engine then check that the injectors are actually squirting if carby engine check that the fuel is in the fuel bowl With engines you have to have a combination of 3 things for the engine to work They are compression -which you will be checking for--2 spark timing--- which you will be checking for and lastly 3 fuel into the cylinder at the right time ==which you will be checking for
you only have to be missing one of these and you had best take it to a professional mechanic to get it started.

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Chevy troubleshooting


Spark, gas, and compression. And check timing. You've done the major work. Now you have to make sure you have done it right. By getting it running, you know. I'm pretty sure you can rent a fuel pressure tester and a cylinder compression tester at some national parts stores, Autozone or O'reillys, maybe others.
I don't understand your expression "...a little miss from bottom end" -an ignition miss, or a bottom skip or noise?

Start with checking ignition-a blue snapping spark-what you want to see at all cylinders. Then check that gas is getting into the cylinders. Fuel pressure and injector solenoid pulse. Then all you need after that is compression -good even compression in all cylinders-. Timing is right, spark timing is right, it should crank, er start.
Just one thing about compression, on a cold engine you're just looking for gross irregularities, you can't depend on the readings to be very accurate. A good compression test should be done on an engine at normal operating temperature. It gives a more accurate picture of your engine condition. As long as compression is over 100 psi per cylinder on a cold engine might be a general guideline, I suppose, but take that as only opinion, not fact..

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2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
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Diagnose engine for engine misfire concern. If diagnostics determine an engine misfire which is characterized by leakage through exhaust valve(s), only replace the affected cylinder head(s).
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So

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Slim possibility, but very expensive unless you have a service contract.
LINCOLN: 1999-2004 Navigator
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