Notices
IS F (2008-2014) Discussion topics related to the IS F model

Problems with Direct Fuel Injection Engines

Thread Tools
 
Search this Thread
 
Old Apr 9, 2009 | 03:28 PM
  #1  
Isfast's Avatar
Isfast
Thread Starter
Lexus Test Driver
iTrader: (13)
 
Joined: Aug 2003
Posts: 833
Likes: 38
From: Florida
Default Problems with Direct Fuel Injection Engines

Check this out.....

http://www.6speedonline.com/forums/9...ine-issue.html

I wonder if we will be ok since we have both direct and port injection, the latter will clean out the gunk????
Reply
Old Apr 9, 2009 | 07:34 PM
  #2  
lobuxracer's Avatar
lobuxracer
Tech Resource
15 Year Member
Liked
Loved
Community Favorite
iTrader: (2)
 
Joined: Jul 2006
Posts: 23,066
Likes: 4,727
From: Georgia
Default

No warning coming here. If you link to a site arguing about the M3 and the IS-F and how someone is going to "set the record straight" and asking other board members to register on the other site so they can join in the argument, yes, you surely will get a warning.

From my experience with my IS350 I doubt this is a big issue because we have both DI and PI. I've long wondered why the 4GR-FE in the IS250 had issues with oil fuel dilution, and this discussion seems to go straight for the throat about dilution and carbon deposits. I almost wish I still had my 350 so I could pull off the intake and look for build up - it had almost 60k on it when I traded it in. Regardless, I did sufficient oil analysis on the 350 to determine there was no significant oil dilution from fuel even with 10k mile oil changes. My F is coming up quickly on the 5k oil change and I'll be pulling a sample to send to Blackstone just before I take it in for the free oil change. So, I'll have a clear picture of what is happening with the engine. I'll also be changing to Mobil 1 5w-30, so I'll build up a database of information about my particular engine as it wears.

In the end, thanks for the link to this discussion. There's also a link to BITOG with even more information. Great stuff!

Last edited by lobuxracer; Apr 9, 2009 at 07:40 PM.
Reply
Old Apr 9, 2009 | 07:44 PM
  #3  
Isfast's Avatar
Isfast
Thread Starter
Lexus Test Driver
iTrader: (13)
 
Joined: Aug 2003
Posts: 833
Likes: 38
From: Florida
Default

Originally Posted by lobuxracer
No warning coming here. If you link to a site arguing about the M3 and the IS-F and how someone is going to "set the record straight" and asking other board members to register on the other site so they can join in the argument, yes, you surely will get a warning.

From my experience with my IS350 I doubt this is a big issue because we have both DI and PI. I've long wondered why the 4GR-FE in the IS250 had issues with oil fuel dilution, and this discussion seems to go straight for the throat about dilution and carbon deposits. I almost wish I still had my 350 so I could pull off the intake and look for build up - it had almost 60k on it when I traded it in. Regardless, I did sufficient oil analysis on the 350 to determine there was no significant oil dilution from fuel even with 10k mile oil changes. My F is coming up quickly on the 5k oil change and I'll be pulling a sample to send to Blackstone just before I take it in for the free oil change. So, I'll have a clear picture of what is happening with the engine. I'll also be changing to Mobil 1 5w-30, so I'll build up a database of information about my particular engine as it wears.

In the end, thanks for the link to this discussion. There's also a link to BITOG with even more information. Great stuff!
Thanks! Keep us posted. I would rather have the oil fuel dilution problem (which can be minimized with frequent oil changes) than the oil gunk (technical term) buildup created by the back-fed vortex.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
lobuxracer
IS F (2008-2014)
6
Feb 13, 2017 08:01 PM
BLKLBL
IS F (2008-2014)
27
Dec 30, 2014 04:41 PM
Rider
IS F (2008-2014)
4
Jun 17, 2012 09:43 AM
ewingli
Canada
1
Sep 10, 2009 04:59 AM
slappy96
SC - 1st Gen (1992-2000)
1
Aug 25, 2007 01:24 PM




All times are GMT -7. The time now is 04:49 PM.

story-0
TRD Off-Road Premium: Best 2026 4Runner, Except This One Thing

Slideshow: diving into 4Runner TRD Off-Road Premium's pricing, performance, fuel economy, features, and amenities!

By Michael S. Palmer | 2026-04-23 13:09:18


VIEW MORE
story-1
Top 10 Lexus & Toyotas to Drive Before You Die!

Slideshow: the 10 Lexus and Toyota vehicles you need to drive before you die.

By Joe Kucinski | 2026-04-23 10:34:24


VIEW MORE
story-2
Top 10 Lexus/Toyotas With The LEAST 5-Year Depreciation

Slideshow: Top 10 Lexus/Toyota models with the lowest 5-year depreciation rate.

By Joe Kucinski | 2026-04-08 12:19:06


VIEW MORE
story-3
Lexus LC500 Convertible Auction: A Preview of Rising Values?

The LC hasn't even disappeared from the Lexus lineup yet, and we're already seeing signs of an explosive market.

By Brett Foote | 2026-04-06 09:25:02


VIEW MORE
story-4
GX 550 vs TX 550: Best 3-Row Luxury Lexus Family Hauler

Slideshow: comparing the pricings, specs, power, fuel economy, fun-factor, and features of the GX 550 Luxury+ and TX 550h+ Luxury.

By Michael S. Palmer | 2026-03-19 13:44:11


VIEW MORE
story-5
9 Best Lexus Models You Can Buy for Half Price (And 1 You Shouldn't!)

Slideshow: 9 best Lexus models you can buy for half price and 1 you should avoid

By Joe Kucinski | 2026-03-19 12:01:07


VIEW MORE
story-6
2026 Lexus NX Buyer's Guide: Models, Features, Prices & More!

Here's everything you need to know about the latest NX.

By Brett Foote | 2026-03-19 11:56:59


VIEW MORE
story-7
Top 10 Reasons to Buy a Lexus TX 550h+ (& 3 Reasons to AVOID!)

Slideshow: reviewing the 2026 Lexus TX 550h+ Luxury plug-in hybrid crossover SUV!

By Michael S. Palmer | 2026-03-05 19:04:47


VIEW MORE
story-8
Top 10 Lexus & Toyota Models of the 1990s RANKED!

Slideshow: Top 10 Lexus and Toyota model of the 1990s ranked.

By Joe Kucinski | 2026-03-04 12:35:11


VIEW MORE
story-9
10 Great Toyotas That Could Have Been Lexus Models

Slideshow: 10 Toyotas that could have been Lexus models.

By Joe Kucinski | 2026-02-19 11:44:33


VIEW MORE