Question about 1995 Lexus Sc 400

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Hesitation in acceleration, I've taken to dealer 3 times, they said it was mass air flow sensor, replaced it, then throtel possition sensor, replaced it, then fuel pump, replaced it, then fuel pump computer, replaced it, then front o2 sensors, replaced them still no help. DOES ANYONE KNOW WHAT TO DO?? Dealer is stumped, they've checked timing, vacume leaks, ecu and wiring for damage none found, fuel injectors grounds, air flow meter, egr for sticking, ALL NO PROBLEMS,, PLEASE PLEASE HELP!! Thanks, Hank

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 36 Answers

SOURCE: mass air flow sensor replacement (variable valve timing)

The MAF is on the Air Intake above the air filter box and screwed into the plastic tube heading toward the throttle body.  It is the 2" by 2" plastic protrution from the air intake tube. There should be two philips screws holding this in.  Remove the two screws and back the entire MAF out.  There is a wire harness connected, unclip this to remove completely.
If you have money burning a hole in your pocket, go ahead and purchase another MAF for a few hundred clams, or you can spend about $10 and clean it.  It's made out of titanium and I doubt it will fail in 10 years.  But sometime it does happen.
Go to Lowes, or Home Depot and buy Electronic Cleaner in a spray can.  If you look inside the sensor, there is a heated wire, and behind that is another wire which picks up the oxidized air.
Stick the tube which is attached to the electronics cleaner spray can into the cavity where these wires are seen.  Continue to spray most of the can onto these wires to remove oxidation build up from the wires.  Let it evaporate for a few minutes then hit it again.
Allow the assembly to evaporate complete for about an hour.
In the mean time, take some throttle body cleaner and spray out the throttle body with the valve open.  Keep open to let it dry out quicker and clean up the black crud that come out.
Keep you air filter replaced.
Put everything back together and you should be good to go.
DIYr-X

Posted on Mar 16, 2009

bunnydawg
  • 5158 Answers

SOURCE: Check engine light is on

no such thing as a catalytic computer... there is a catalytic converter ... part of the exhaust system so they may now be "guessing" that it's an O2 sensor. take the car to autozone... they will scan the codes for free.... post the codes here tho the lads and lasses there are pretty clever and will probably tell you what the codes mean.

Posted on Apr 16, 2009

mkv0525
  • 358 Answers

SOURCE: How do I change a mass air sensor?

82032169

Posted on May 21, 2009

ronaldo_ross
  • 1056 Answers

SOURCE: 1994 lexus has no acceleration just creeps.

Check the MAF sensor, If this malfunction, the computer cannot determine how much air is going into the engine so it can't determine how much fuel to put in there. Also a bad coil, or any part of the ignition system can cause this.

Posted on Aug 05, 2009

Mustgo
  • 2359 Answers

SOURCE: I have a 1998 Ford Explorer and I can't get the

You missed two spots.

EGR air passage tube

and

EGR base gasket

The air passage tube get clogged with carbon just like the base of the EGR valve.

It's ten time worst!!!

Get a full bottle of SeaFoam,WD-40 and a snake/wire to clear out this passage.

A home vacuum clean will help speed up the job.

DO NOT forget to get a new EGR base gasket.


Good luck

Posted on Aug 31, 2009

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WHAT IS MASSIVE AIR FLOW SENSOR


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My 99 Audi A4 2.8 Quattro was havinga problem starting at times. It would idle poor upon start and then it would come up in rpm where it should be. I had hesitation from a start and after coasting for more than 5-8 seconds, the car would shake violently upon acceleration at about 1/3 throttle. I cleaned the Mass Air Flow Sensor. This helped but did not solve all my problems. I then replaced the Mass Air Flor Sensor. Little to no change there ($108.00). Lastly, I replaced the spark plugs. I bought Bosch plugs ($4.82 ea.). This got rid of all the symptoms. I had bad lugs and possibily a dirty MAF!

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I had the same problem with sluggishness and hesitation was worried about pulling out into traffic had to make sure there was enough distance after trying new catalytic converter still had problem garage changed mass air flow sensor and that did it still had some slight heitation but that turned out to be cap and rotor wear/oxidation running much better now

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