Question about 1999 Nissan Altima
I get service engine light soon and the 4 cylinder at idle shows compression at 50, checked 3 cylinder and compression shows at 100, can something like that cause cylinders to loose compression?
You have a bad intake or exhaust valve
Check Lights are just an indication of a system
fault code set in vehicles computer
You use the codes to help diagnose the issues
if they are of any help
Codes & Sensors that produce check lights- just indicate
that something is not to programmed Emission Specs
& only component testing will find the problems
Posted on Dec 12, 2012
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Do a compression test like you did , then put 10 mls of oil in the cylinder and retest , if compression goes up to other cylinders the rings are shot, if it stays the same it is a valve problem , check the valve clearance in case a lifter has pumped up, if ok the valves are burnt out .
Posted on Apr 07, 2015
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Posted on Jan 02, 2017
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The information below was complied by me, it explains what causes the check engine light or Service Engine Soon light to come on and the process of finding the cause.
When the Check Engine light or Service Engine Soon light (depends on make) is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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