your lt1 turns over but will not start
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from a 93 factory shop manual, should cover a few years. hope its usefull for someone
http://shbox.com/1/4th_gen_tech2.html#opti_test Attachment 23321 Attachment 23322 Attachment 23323 Attachment 23324 Attachment 23325 Attachment 23326 Attachment 23327 Attachment 23328 Attachment 23329 Attachment 23330 Attachment 23331 Attachment 23332 Attachment 23333 |
New sticky. Thanks craby.
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Originally Posted by My93camaro
(Post 612314)
Okay, so i put oil in the cylinders but did not recheck compression yet. But the car did backfire a couple times when trying to crank it, which it hadn't done before
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Just to add to the above, you need to be 100% sure you disabled your ignition and fuel systems during the compression test. Not being able to fire a charged coil is really bad for the coil but worse is 8 cylinder shooting out gas and live wires trying to firing spark in your engine compartment. I have seen more then one car set on fire during compression tests.
There is a leak down test you can do to check where the compression is being lost. (search leak down test on You tube). You can also buy a cheap plug adapter and pump compressed air into the cylinder and try to hear where the major leak is. After reading the whole thread I am getting the feeling you have a another issue and you did the compression test wrong. They tell us in school you need 100 PSI of compression for the fuel to atomize and to get a motor to run but you should be back firing like crazy if low compression is the issue. Another possible issue is exhaust back pressure (plugged cat) Here is my normal "what to do with a no start" 1.)Crank car does it sould like it has compression? 2.)Check for spark, is it hot enought? (spark tester) 3.)Check for fuel pressure. (fuel pressure gage) 4.)Check for signal to injector (Use noid light) 5.)Check exhaust back pressure. (Pressure gage, Some vacuum gages have pressure sides) 6.)Pull plug and make sure they are not flooded our. (a wet plug with not fire ) I can not remember ever having a car that had all the above ok and did not atleast backfire or spudder and I have fixed a lot of no start cars |
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test igntion coil module
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