Question about 1993 Jaguar XJ6

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One of cylinder compression is 30psi Told me replace burned exhaust valve Should I do or just get new car? How can this have happened? 1993 Xj6 4.0

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30psi is so low if in your place isn·t expensible tryed to fix but5 could be the rings too & this kind of problems are for overheatiing check the cooling sistem too

Posted on Jul 16, 2009

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1993 nissan pickup 12 valve running of 3 cyliners. Removed spark plug wires and found that one cylinder was dead, then removed the spark plug wire from this cylinder, grounded it and had spark.


Can you do a compression test?

There may be something amiss with the piston or valve.. and it's usually the exhaust valve that has burnt/split, allowing compression to be kicked straight out of the exhaust. The symptom of a burnt/split exhaust valve is akin to a misfiring spark plug

Apr 23, 2016 | 1993 Nissan Pickup

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What are codes p1401 p0302 p0305 p1409 p0301


P1401 Differential Press Feedback EGR Circuit High Input
Your EGR port is plugged. Replace your EGR valve, and clean the ports
A code P0302 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
  • A code P0305 may mean that one or more of the following has happened:
    • Faulty spark plug or wire
    • Faulty coil (pack)
    • Faulty oxygen sensor(s)
    • Faulty fuel injector
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Running out of fuel
    • Poor compression
    • Defective computer
    • A code P0301 may mean that one or more of the following has happened:
      • Faulty spark plug or wire
      • Faulty coil (pack)
      • Faulty oxygen sensor(s)
      • Faulty fuel injector
      • Burned exhaust valve
      • Faulty catalytic converter(s)
      • Running out of fuel
      • Poor compression
      • Defective computer
      • A code P0302 may mean that one or more of the following has happened:
        • Faulty spark plug or wire
        • Faulty coil (pack)
        • Faulty oxygen sensor(s)
        • Faulty fuel injector
        • Burned exhaust valve
        • Faulty catalytic converter(s)
        • Running out of fuel
        • Poor compression
        • Defective computer
        • p1409
        • EGR Vacuum System Leak - Read Our Article on EGR Valve Codes For Help With This Oldsmobile Check Engine Light Code

Sep 25, 2014 | Cars & Trucks

2 Answers

I have a 2006 Sebring with a 4 cly it has no compression in cylinder 1 it has only 15 lbs of presser but it doesn't smoke


possible problems, is your radiator low, if so you can be pushing your compression out a blown head gasket into the cooling system forcing your antifreeze out, if this is not happening then, if you have a burnt valve on the exhaust or intake valve, or bent valve, or broken valve spring not letting the valve open all the way, broken piston ring, collapsed lifter if it has hydraulic lifters, a lot of the sebrings had problems with the tentioner going bad for the timming chain, looseing oil pressure inturn affecting the valves to open correctly causeing no compression, im not sure if you have a hydraulic tensioner on a four cylinder but its worth looking into. I had a car I worked on long ago for a guy, no compression on one cylinder, I pulled the head and found that he had a hole burned through the piston caused by a leaking fuel injector, over a period of time it burned through and melted, you could put your finger in it.

Jul 23, 2014 | Cars & Trucks

1 Answer

1993 Subaru loyale no compression, have spark at the coil just won't start


The engine can't run without compression in the cylinders. The plug will still spark, but without a compressed air/fuel mixture to burn and power the cylinder down, the starter will just keep spinning the engine over, cranking forever and not starting.
Check if your timing belts are good and not broke. Cylinder compression is dependent on good piston rings, intake and exhaust valves that open and close at right times and that seal good when closed, and a head gasket that seals up the cylinder from leaks where compression could blow into the water passages, or oil passages, or to outside of engine.
If the timing belts are good, a leak-down test of each cylinder will pinpoint where compression is lost.
Good luck with the Sube, great cars, great engines, but the head gaskets are a common problem.

Jun 11, 2013 | Cars & Trucks

1 Answer

1993 accord has dead cylinder


I have seen many of those years Accords with a burnt intake valve, from too much EGR gas entering only one cylinder, overheating and eventually burning and breaking that valve. This causes the valve to not be able to seal the combustion chamber, resulting in no compression and no power from that cylinder. You will have to remove the head and change out the broken valve. When done replacing the valve, clean out the EGR ports in the intake or the valve will be damaged once soon. Those blocked EGR passages are what cause the burnt valve problem in the first place.

Jul 14, 2012 | 1993 Honda Accord

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My 2006 s40 burns oil, it has since 70k. I had a compression check done before the end of the warrantee but they told me that everything was in spects except one cylinder--it's a five cylinder. ...


Is your oil clean,???? It may very well have good rings. Did the car ever "seriously" overheat, proir to this happening.??? If so, the valve seals, on some cars have boots, that look like umbrellas, that sit on the valve stem, between the valve stem & spring. A lot of foreign design engines, only use "o" rings. If the engine got hot enough, they can get brittle & break off. The oil that it is supposed to stop, runs down the valve, into the combustion chamber, & gets burned off. You will have a wet, blck reside inside the mouth of the exhaust pipe ir this is the problem. Then a valve job,or some GOOD nechanics, can add new seals, without removing the engine heads, the prefered, most inexpensive fix.

Sep 01, 2011 | 2006 Volvo S40

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When going uphill its weak. already chang sparkplug to new but still the same.when stepping on the gas pedel its not giving more power.


I suspect you have some bad valves, probably exhaust valves. Do a compression test on each cylinder and make the sure the compression of each cylinders is a similar value. You will need to
look up what the compression value should be in a Chiltons or other manual for your car.

This happened to me on my 1992 Tercel. When going up a hill I would punch the gas to the floor
and not speed up until I geared down. I took the cylinder head off and 2 exhaust valves looked really bad. I went to a cylinder head shop and the guy that works there immediately told me I need a valve job and pointed out the beat up looking valves I saw. They machined the valve seats and replaced the bad valves. Rockers need to be adjusted with the engine warm, so youll need to adjust the rocker clearance after you re-install the head and run the engine.

If the compression is much lower in one or more cylinder those are the ones with a problem.

You can get a loaner compression tester from autozone. If you have never checked compression, I will tell you how if you need.

Aug 08, 2011 | 1995 Toyota Camry

3 Answers

#1 plug is miss-firing.I have replaced plug and wire,but keeps miss-firing only on#1 plug.have been told that coolant is possibly getting in #1cylinder.also I have been told #1 coil could be bad.witch is...


Could only be a few things. The coil #1, Fuel injector #1, Stuck intake or exhaust valve, or blown head gasket allowing coolant into cylinder #1. Use a spark tester to check the spark coming out of cylindr #1 if checks good then ohm test the injector when it is warm. Check other injectors to compare. Do a compression test on cylinder #1 and test other cylinders to compare. If cylinder is low compression suspect valves and or head gasket. If compression is low then het a leak down tester to test if a valve is broke or sticking. On your sable i would suspect injector or coil most likely.

Oct 10, 2010 | 2000 Buick LeSabre

2 Answers

93 honda accord engine no fire cylinder 1


Check timing belt,sounds like belt may have skipped.

Jul 28, 2009 | 1993 Honda Accord

1 Answer

Running on 5 cylinders and needs new coil


If the cylinder is not working because of spark a coil may solve the problem. If the cylinder is not working because of compression, it may be a bad valve intake or exhaust bad piston rings etc. A guide to go by is when you check the compression with a compression guage. The difference shouldn't be more than 10 psi between each. Good Luck

Dec 09, 2008 | 1998 Honda Accord

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