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1990 Cadillac Seville WHITE SMOKE !

Tiny
TERRY HARBIN
  • MEMBER
  • 1990 CADILLAC SEVILLE
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!
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Thursday, September 20th, 2007 AT 9:57 PM

7 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
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?
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Friday, September 21st, 2007 AT 8:02 AM
Tiny
TERRY HARBIN
  • MEMBER
  • 4 POSTS
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?
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Friday, September 21st, 2007 AT 1:15 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Have a peek under the car where the lift picked it up, they may have crushed a fuel return line?
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Friday, September 21st, 2007 AT 3:53 PM
Tiny
SERVICE WRITER
  • MECHANIC
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Son of a gun, never thought of that scenario.
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Friday, September 21st, 2007 AT 4:21 PM
Tiny
TERRY HARBIN
  • MEMBER
  • 4 POSTS
Sorry, still learning how to post properly. Sent a PM to Merlin. Thanks.
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Thursday, September 27th, 2007 AT 9:44 PM
Tiny
TERRY HARBIN
  • MEMBER
  • 4 POSTS
Would a fuel pressure regulator malfunctioning to excessive pressure cause this?
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Thursday, September 27th, 2007 AT 9:51 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
A faulty regulator can cause high pressure. HAve you checked the pressure?
IT needs to be 40-50 PSI.
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Friday, September 28th, 2007 AT 5:17 AM

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