2001 Pontiac Sunfire engine cranks but wont start

2001 PONTIAC SUNFIRE
227,106 MILES • 4 CYL • FWD • AUTOMATIC
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TITCHY
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i have come up with code P0300 misfire detetcted by pcm. i have changed, camshaftsensor, crankshaft sensor, coils are firing, pump sounds likes running, smell gas, i have completed a compression tets on the engine 1 cly -60psi, 2cly-40psi, 3cly-60psi, 4th clyis 120psi. i'm not sure ? is it the timing chain, but heard they are dont uselly dont break that quickly , in the past it heated acouple of times, changed coolant sensor, fan relay , thermosatate. it seem to work for a bit overheated agin and wont start.

what is your suggestion ?
Apr 20, 2009 at 12:33 PM
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TITCHY
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[quote:0e0e3c0b8a="titchy"]Engine Performance problem
2001 Pontiac Sunfire 4 cyl Front Wheel Drive Automatic 227106 miles

i have come up with code P0300 misfire detetcted by pcm. i have changed, camshaftsensor, crankshaft sensor, coils are firing, pump sounds likes running, smell gas, i have completed a compression tets on the engine 1 cly -60psi, 2cly-40psi, 3cly-60psi, 4th clyis 120psi. i'm not sure ? is it the timing chain, but heard they are dont uselly dont break that quickly , in the past it heated acouple of times, changed coolant sensor, fan relay , thermosatate. it seem to work for a bit overheated agin and wont start.

what is your suggestion ?[/quote:0e0e3c0b8a]
May 1, 2009 at 8:44 PM
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