1990 Cadillac Seville WHITE SMOKE !!!

1990 CADILLAC SEVILLE
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TERRY HARBIN
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Took my '90 Caddy Seville 4.5L 119K miles (which DID run like a top) to a local tire shop for alignment and two front tire replacements. Cranked it when they finished at shop and, WHITE SMOKE! They said they didn't even open the hood, only test drove it after alignment. I insisted they find problem, only to get nothing. They said "no codes" and in fact there are none, nor the "Service Engine Soon" telltale. Heavy white smoke, so heavy that liquid fuel condenses out of exhaust on ground. No codes; tried overriding injectors while running by disabling-no effect. Pulled fuel pump relay while running-no effect at all. Suspecting fuel pump regulator, or open injector. Am I in the ballpark? Checked all injector and fuel pump fuses. Could a faulty ECM or grounds result in this? Should I just check the fuel pressure? Help this shop-manual tote'n shade-tree mechanic wannabe!
Sep 20, 2007 at 9:57 PM
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SERVICE WRITER
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The 4.5 wasn't the greatest engine, better than the 4.1. I see no relation what-so-ever to the tire shop on this.

White smoke is typically coolant, has the level dropped at all?
Sep 21, 2007 at 8:02 AM
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TERRY HARBIN
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[quote:891671e3fa="Service Writer"]The 4.5 wasn't the greatest engine, better than the 4.1. I see no relation what-so-ever to the tire shop on this.

White smoke is typically coolant, has the level dropped at all?[/quote:891671e3fa]

No change in coolant level. Heavy fuel smell and liqued fuel dripping out of exhaust pipe. All white exhaust. This car is never driven fast or hard (<3K miles/year). If tire shop test driver "punched" it excessively, could damage have been done?
Sep 21, 2007 at 1:15 PM
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MERLIN2021
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Have a peek under the car where the lift picked it up, they may have crushed a fuel return line?
Sep 21, 2007 at 3:53 PM
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SERVICE WRITER
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Son of a gun, never thought of that scenario.
Sep 21, 2007 at 4:21 PM
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TERRY HARBIN
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Sorry, still learning how to post properly. Sent a PM to Merlin. Thanks.
Sep 27, 2007 at 9:44 PM
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TERRY HARBIN
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Would a fuel pressure regulator malfunctioning to excessive pressure cause this?
Sep 27, 2007 at 9:51 PM
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SERVICE WRITER
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A faulty regulator can cause high pressure. HAve you checked the pressure?
IT needs to be 40-50 PSI.
Sep 28, 2007 at 5:17 AM