Mechanics

4.5 ENGINE

1988 Cadillac Seville • 120,000 miles

Car run rough, changed plugs, wires, distributor cap, rotor and coil now it wont start, I am a ford guy, this car has fuel and fire but will not start now, when it spends over it doesn't even try to catch has HEI system and I ohmed the coil and ck ground any help would be great
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Sammy dubose
August 21, 2013.



If it has fuel and spark then check compression these 4.5 motors were junk and have a lot of head gasket problems among other things.

Hmac300
Aug 21, 2013.
Sorry just checked again and I do not have any spark to the plugs

Tiny
Sammy dubose
Aug 21, 2013.
If you go to the site here it will tell you how to test the ignition system under either tune up or how to repair. if the check engine light is on cross A&B on the aldl with a paper clip turn key on and watch light it will blink in 3's 1 then 2=12 which is normal for car off with key on. then look under obd 1 on site on what to check if codes. It may be an ignition module or pick up coil which are in dist an dist must come out to fix pickup coil. I forget what ohms it should have but sometimes wires break due to advancing on an doff all the time. The aldl is below dash left hand side by steering column

http://www.2carpros.com/articles/how-to-test-an-ignition-system

http://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Hmac300
Aug 21, 2013.