Excessive white smoke, uses too much fuel, transmission slips

Tiny
DON DEAN HILL
  • MEMBER
  • 1992 CADILLAC SEVILLE
  • 4.9L
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
White smoke, no overheating or coolant loss and gas mileage is bad. Transmission slips at times taking off like a chugged.
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Thursday, January 12th, 2017 AT 2:38 AM

10 Replies

Tiny
HMAC300
  • EXPERT
Have coolant system pressure checked. This motor was famous for head gasket problems. Check transmission fluid, if dark brown or black maybe needs a transmission overhaul. Finally scan for codes.
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Thursday, January 12th, 2017 AT 8:19 AM
Tiny
DON DEAN HILL
  • MEMBER
Been done no leaks or overheating. Uses about a gallon of gas a mile though. Injector maybe?
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Thursday, January 12th, 2017 AT 8:40 AM
Tiny
HMAC300
  • EXPERT
Scan for codes and check fuel pressure with a gauge auto parts rent it. See link.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Thursday, January 12th, 2017 AT 10:01 AM
Tiny
DON DEAN HILL
  • MEMBER
Fuel pressure is 33 psi and when I disconnect the regulator it goes up about five pounds. No fuel smell from hose or regulator.
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Thursday, January 12th, 2017 AT 12:20 PM
Tiny
JOHNNY G.JR
  • MEMBER
Check your oil for residual gas fumes and its level.
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Thursday, January 12th, 2017 AT 2:18 PM
Tiny
DON DEAN HILL
  • MEMBER
Yes, the oil smells gassy, but is clear. I seam to have just noticed that I have quite a bit of blow by also.
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Thursday, January 12th, 2017 AT 2:58 PM
Tiny
KEN
  • ADMIN
Hey Don,

Can you remove the radiator cap to see if there is pink goo inside? This will mean you have a radiator cooler that is blown. Also, can you pull the transmission dipstick to check the transmission fluid level please?

Please let me know what you find.

Best, Ken
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Thursday, January 12th, 2017 AT 4:33 PM
Tiny
HMAC300
  • EXPERT
Your fuel pressure should be 45-50 psi. So it is quite low but with the blow by do a compression test and if possible a cylinder leak down test.
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Thursday, January 12th, 2017 AT 4:38 PM
Tiny
DON DEAN HILL
  • MEMBER
No pink in radiator fluid and trans fliud clean, I unhooked the modulator now it shifts right no slippingand also I checked each injector as it was running and all were ticking, but I did unhook the canister vent line at the lower front of the throttle body and it was wet and the rubber hose was melting, left it unhooked and ran for about 30 mins and smoke went away, then went to store tonight with 90 degree engine temp and smoke id back but looks grey now
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Thursday, January 12th, 2017 AT 10:23 PM
Tiny
HMAC300
  • EXPERT
If you unhooked canister then the purge valve is shot and you have a vacuum leak if you didn' plug the line. I think your problems are deeper however.
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Friday, January 13th, 2017 AT 7:04 AM

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