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99 Es300 Hesitation And Poor Fuel Mileage


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#1 denn77

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Posted 08 May 2005 - 07:03 PM

Hi people, I recently got a 99 es300 and I have problems with it:( Fuel mileage was really bad when I first got it, around 15 mpg and now after a couple of techron bottles, new ngk iridium plugs, cleaned MAF sensor and change pcv valve, I'm up to 18 mpg.

This is 60% city driving. The car has 87k miles. Oh, the maf sensor cleaning made a significant improvement with acceleration. But it is sluggish in the morning. It gets better after it warms up, but still even after it's warm its sometimes sluggish. After reading several posts, I was thinking of changing out both o2 sensors. I test drove several other es300 all 1998 models and they were all quicker than the one I have. What else can I do?

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#2 jweiss

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Posted 08 May 2005 - 07:54 PM

I had similar problems with my used 2000. I disconnected the battery for a short while so that the computer setting for transmission reverted to factoty setting. If you have the intelligent tranny, it may have morphed to driving habits of previous driver(s). It worked wonders for me.

#3 camlex

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Posted 08 May 2005 - 08:30 PM

Hello,

Which year they started intelligent tranny(Smart).

Thanks,

#4 denn77

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Posted 08 May 2005 - 09:39 PM

Actually, I've tried disconnecting the battery for several hours to try to get things reset already and it didn't help. :(

#5 Beer Dave

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Posted 09 May 2005 - 07:12 AM

If you aren't getting a check engine light, you might want to look into a Motorvac service. Do a search on the forums for more details.

#6 IlyaIlya

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Posted 09 May 2005 - 03:39 PM

I think 18 mpg is fine,

I m getting 14-17 in city/highway, but i think its because its NYC and we got ethylene in 87 octane,

I ll try cleaning the pvc/replacing it,


HOW did you cleam maf?

if i do motorvac would i need to clean maf/replace pvc

thanx

#7 denn77

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Posted 09 May 2005 - 04:32 PM

Cleaning the MAF was really easy. I just pulled it out of the air intake tube and sprayed electrical component cleaner on the red sensor needle. One side of the needle was clearly dirty. Afterwards I remounted it and thats it. This did make the acceleration smoother. I'm still having the sluggish acceleration problems though.

Will the motorvac clean out the injectors too? Are there any side effects to worry about with the motorvac procedure?

#8 ford212.809

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Posted 10 May 2005 - 08:06 AM

I hate to here about your "poor" mileage. I consistantly receive
25-27 m.p.g. with my ES with 122,000 miles. I have done nothing
to the car to speak of to deserve the great mileage. B)

#9 Beer Dave

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Posted 10 May 2005 - 08:48 AM

Cleaning the MAF was really easy.  I just pulled it out of the air intake tube and sprayed electrical component cleaner on the red sensor needle.  One side of the needle was clearly dirty.  Afterwards I remounted it and thats it.  This did make the acceleration smoother.  I'm still having the sluggish acceleration problems though. 

Will the motorvac clean out the injectors too?  Are there any side effects to worry about with the motorvac procedure?

 


I haven't done a motorvac on my car, however as I was researching the problems I was having the symptoms were pointing in that direction. Turns out I had a faulty coil on one of my plugs. I recommend you read the forums and search for motorvac service. From what I have seen this is a common issue for people with hesitation and idling problems. My understanding is the motorvac service cleans out the throttle body and associated components, but I don't believe it does anything to the injectors. Based upon other posts in the forum it appears that shops that offer this service charge $100-$120.

Good luck. :cheers:

#10 Lexusfreak

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Posted 10 May 2005 - 04:40 PM

Hi people, I recently got a 99 es300 and I have problems with it:(  Fuel mileage was really bad when I first got it, around 15 mpg and now after a couple of techron bottles, new ngk iridium plugs, cleaned MAF sensor and change pcv valve, I'm up to 18 mpg. 

This is 60% city driving.  The car has 87k miles.  Oh, the maf sensor cleaning made a significant improvement with acceleration.  But it is sluggish in the morning. It gets better after it warms up, but still even after it's warm its sometimes sluggish.  After reading several posts, I was thinking of changing out both o2 sensors.  I test drove several other es300 all 1998 models and they were all quicker than the one I have.  What else can I do?

 


From your description, you have done a 'partial major tune up'. I would change the fuel filter, air filter, have the throttle body cleaned & adjust your tire pressure (assuming this has not been done).

Perhaps a couple of tanks of premium fuel wouldn't hurt either. B)

 :cheers:

#11 IlyaIlya

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Posted 10 May 2005 - 05:39 PM

FORD: there is no way you will be getting that fuel milage here in nyc in city/highway driving

#12 ford212.809

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Posted 10 May 2005 - 07:19 PM

I do not doubt that at all, friend. THAT is why I live in the hills of
Tennessee. ;)

Like I said in another post, I don't know why I get the great mileage,
I try to drive the speed limit at all times. Maybe that is why.... B)

#13 SKperformance

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Posted 10 May 2005 - 07:42 PM

motor vac funs through the fuel system from the fuel lines.
so it does clean the injectors.
The throttle body is cleaned manually by the tech doing the service with a can.
Motorvac is the best way to improve gas mialge easily.
Btw you never mention clean the intake /throttle body which is also a problem for cold drivability issues.

#14 denn77

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Posted 11 May 2005 - 01:49 PM

You guys have been a lot of help. As I make changes to my car, I'll report any improvements.

Thanks! :) javascript:emoticon(':)')
smilie

#15 denn77

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Posted 23 May 2005 - 09:50 AM

I think I have another clue to my problem. It sounds weird but usually after I fill up the gas tank, the car runs faster. I always use Shell or Chevron 87 octane. I've had many cars and never have I seen something like this.

I made an appt with my local lexus dealer for an engine diagnostic for this Wednesday and then over this last weekend I filled up the tank. Now the car runs great, no hesitation.

When I do have the hesitation problems, one of the symptoms is surging I think its called. I would accelerate and as the rpms climb to around 3k I'd feel this sudden burst of power, which is not right.

Thats all I have for now.

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