Why does my car smoke from the exhaust after coasting downhill when there is a build up of negative pressure?

10

Asked by Aug 31, 2017 at 04:59 PM about the 2007 Lexus GS 350 RWD

Question type: Maintenance & Repair

I own a 2007 Lexus GS350 with 185000 miles on it. It runs beautifully with a
great amount of power. Besides the smoke that billows out it runs like a
champ.
I usually avoid the clouds of smoke by dropping my transmission into Neutral
when coasting downhill then put it back into gear just when I am ready to
apply pressure to the accelerator. If I don't do this, it will blow out massive
amounts of smoke. I have taken it to a repair shop and they said the number
5 head gasket was leaking and it needed a valve seal job. $4500 later and it
still smokes. They did the same job twice and it still smokes. Now they turn
me away and say they are done working on my car, so I had to pursue legal
assistance. Does anyone have an idea of what the actual issue could be?

4 Answers

72,515

What color is the smoke? Blue is oil burning, grey is automatic transmission fluid, black is too much fuel, and white is water vapor. Are any of your fluids going low repeatedly? HTH. -Jim

Best Answer Mark helpful
10

I want to say it looks bluish white. Smells like oil burning. My oil maintenance light always comes on to change oil and low engine oil always comes on so I have to add oil often.

1 of 1 people found this helpful.
72,515

Definitely sounds like burning oil. If you're seeing the smoke at idle such as waiting for a traffic light or in line at a drive thru it's valve guide seals. If you are seeing the smoke while driving it's your piston rings. HTH. -Jim

1 of 1 people found this helpful.

That engine in your car is a 2GR-Fxx These engines are rock solid and would not need any valve seals/stem seals etc. Only common issue you will see on these cars is "Engine Sludging". Your car may have been poorly maintained, which means you could have missed few service intervals creating a grease like material in the rocker covers. This sludge makes it hard for engine valves to work efficiently. In order to fix this issue, you will have to keep doing engine flushes every 2-400 kms. Best answer: http://www.noordeman.com.au/smokey-toyota-2gr-fe-v6-engine-the-simple-solution/

Your Answer

GS 350

Looking for a Used GS 350 in your area?

CarGurus has 49 nationwide GS 350 listings starting at $8,999.

Postal Code:

Lexus GS 350 Experts

  • #1
    F_O_R
    Reputation
    60
  • #2
    Js08016
    Reputation
    40
  • #3
    tennisshoes
    Reputation
    30
View All

Related Models For Sale

Used Lexus ES 350
32 Great Deals out of 218 listings starting at $5,695
Used Lexus LS 460
21 listings starting at $11,900
Used Lexus IS 350
14 Great Deals out of 83 listings starting at $7,995
Used Lexus GS 300
8 listings starting at $6,495
Used Lexus RX 350
51 Great Deals out of 560 listings starting at $8,000
Used BMW 5 Series
47 Great Deals out of 661 listings starting at $2,449
Used Lexus IS 250
22 Great Deals out of 199 listings starting at $5,988
Used Lexus GS 450h
2 listings starting at $13,800
Used Mercedes-Benz E-Class
38 Great Deals out of 577 listings starting at $2,390
Used Honda Accord
79 Great Deals out of 1,148 listings starting at $2,000
Used Toyota Camry
117 Great Deals out of 2,256 listings starting at $1,900
Used Mercedes-Benz C-Class
140 Great Deals out of 1,545 listings starting at $4,495
Used Mercedes-Benz S-Class
8 Great Deals out of 142 listings starting at $2,988

Used Cars For Sale

2017 Lexus GS 350 For Sale
2 listings starting at $62,199
2016 Lexus GS 350 For Sale
2 listings starting at $52,900
2015 Lexus GS 350 For Sale
7 listings starting at $37,995
2014 Lexus GS 350 For Sale
8 listings starting at $32,707
2013 Lexus GS 350 For Sale
14 listings starting at $17,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.