twijr1 Posted April 30, 2009 Share Posted April 30, 2009 hello all, here recently i have noticed on acceleration the engine tends to bog down or stumble when the throttle is depressed about a third of the way. it is really noticeable after being at highway speeds then exiting and trying to accelerate from a near complete stop. i have repair manuals and i have checked the MAF, throttle body motor, and tps for resistance checks and they are good. there are no codes present. i dont have a lexus hand held tool, so a lot of the checks in the manual i can not do. does anyone have any thoughts? thanks in advance. Quote Link to comment Share on other sites More sharing options...
dcfish Posted April 30, 2009 Share Posted April 30, 2009 hello all, here recently i have noticed on acceleration the engine tends to bog down or stumble when the throttle is depressed about a third of the way. it is really noticeable after being at highway speeds then exiting and trying to accelerate from a near complete stop. i have repair manuals and i have checked the MAF, throttle body motor, and tps for resistance checks and they are good. there are no codes present. i dont have a lexus hand held tool, so a lot of the checks in the manual i can not do. does anyone have any thoughts? thanks in advance. How many miles on the GS ? Have you ever cleaned the TB ? Check for any vaccum leaks, Does it idle normal ? Quote Link to comment Share on other sites More sharing options...
twijr1 Posted April 30, 2009 Author Share Posted April 30, 2009 hello all, here recently i have noticed on acceleration the engine tends to bog down or stumble when the throttle is depressed about a third of the way. it is really noticeable after being at highway speeds then exiting and trying to accelerate from a near complete stop. i have repair manuals and i have checked the MAF, throttle body motor, and tps for resistance checks and they are good. there are no codes present. i dont have a lexus hand held tool, so a lot of the checks in the manual i can not do. does anyone have any thoughts? thanks in advance. How many miles on the GS ? Have you ever cleaned the TB ? Check for any vaccum leaks, Does it idle normal ? it has 134,000. i cleaned the tb when i installed the SRT intake and ecu about 10,000 miles ago; i hope that is not the problem. i haven't checked for vacuum leaks and it idles normally. i will check the vacuum leaks tonigt. Quote Link to comment Share on other sites More sharing options...
twijr1 Posted May 5, 2009 Author Share Posted May 5, 2009 hello all, here recently i have noticed on acceleration the engine tends to bog down or stumble when the throttle is depressed about a third of the way. it is really noticeable after being at highway speeds then exiting and trying to accelerate from a near complete stop. i have repair manuals and i have checked the MAF, throttle body motor, and tps for resistance checks and they are good. there are no codes present. i dont have a lexus hand held tool, so a lot of the checks in the manual i can not do. does anyone have any thoughts? thanks in advance. How many miles on the GS ? Have you ever cleaned the TB ? Check for any vaccum leaks, Does it idle normal ? it has 134,000. i cleaned the tb when i installed the SRT intake and ecu about 10,000 miles ago; i hope that is not the problem. i haven't checked for vacuum leaks and it idles normally. i will check the vacuum leaks tonigt. checked for any vacuum leaks, could not find anything. Quote Link to comment Share on other sites More sharing options...
SKperformance Posted May 6, 2009 Share Posted May 6, 2009 Replace the maf. Quote Link to comment Share on other sites More sharing options...
twijr1 Posted May 11, 2009 Author Share Posted May 11, 2009 Replace the maf. thanks skp. replaced the maf. very little lag time and much better throttle response. :) Quote Link to comment Share on other sites More sharing options...
SKperformance Posted May 12, 2009 Share Posted May 12, 2009 I would remove the srt module and compare it as well to se if it is part of the issue as well. Quote Link to comment Share on other sites More sharing options...
Xpound Posted May 22, 2009 Share Posted May 22, 2009 Replace the maf. Hey whats the maf? Quote Link to comment Share on other sites More sharing options...
dcfish Posted May 22, 2009 Share Posted May 22, 2009 Replace the maf. Hey whats the maf? Mass air flow sensor B) It is located between the air intake filter and the throttle body, Can't miss it............. Quote Link to comment Share on other sites More sharing options...
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