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1994 Nissan Sentra No Start

1994 NISSAN SENTRA
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PRIMERGRAY
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  • 13 POSTS
I have fuel pressure, the #4 plug is fouled bad, the #3 plug fouled, the #2 plug is kinda fouled, the #1 plug is perfect, all injectors are working, the only idea i have is the fuel pressure regulator.
Jan 14, 2007 at 7:37 AM
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SERVICE WRITER
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What kind of shape is the cap and rotor in?

Are you getting good spark to the fouled cylinders?
Jan 14, 2007 at 9:42 PM
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PRIMERGRAY
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  • 13 POSTS
I Am Getting Good Spark To All Cylinders, I Took Out All The Plugs And Turned The Motor Over, When I Looked Down To At The Top Of The Pistons, The #4 Cyclinder Was Full Of Gas, The #3 Cyclinder Was About Half Full And The #2 And #1 Cyclinders Were Dry, Could It Be The Injectors
Jan 20, 2007 at 6:18 AM
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SERVICE WRITER
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It sounds like 1 & 2 are fine and combustion is happening there, 3 & 4 have spark and fuel but no compression. In which case I would compression test those two cylinders of interest, but would do all four for comparaision. Normal is 192 psi, Minimum has to be 164 psi, there can be no variance of 14 psi between them.

After re-reading, I may have mis-read. You cranked after the plugs were out. IF that is correct, then you may be on the right track, except for this. The # 1 plug is clean, the 3 and 4 are the worst showing rich conditions. The rich condition matchs the massive fuel in the cylinders. I would still compression test and get new plugs in there.
Jan 20, 2007 at 8:22 AM
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Suggested Repair

Compression-test all four cylinders and compare them (about 192 psi normal, 164 psi minimum, no more than 14 psi variance). Install new spark plugs. Fuel pooled in cylinders 3 and 4 matches the rich, fouled plugs, so do not assume the fuel pressure regulator until compression is checked.

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Conversation Summary

A 1994 Nissan Sentra 1.6L with 120,000 miles will not start. The owner reports fuel pressure, working injectors, and unevenly fouled plugs, with cylinder 1 clean and cylinders 3 and 4 worst. Spark is present at all cylinders. After removing the plugs and cranking, cylinders 4 and 3 contained fuel while 1 and 2 were dry. The expert recommends a compression test of all four cylinders and new plugs rather than immediately blaming the fuel pressure regulator.

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