5S-FE surging at low throttle angle?

twos4yous · 07-17-2007, 06:25 PM

hi all, I recently picked up a 91 na, Rescued is more like it. I saved the car from previous owner who has posted on this site before, and was attempting to "rice it out" Any ways i have already corrected alot of crappy work that has been done to this veh. I am having a strange problem at very low throttle input, like stop and go traffic, the engine feels like it is surging, or on/off throttle feel. i have already installed new throttle cables, and properly adjusted them.

I just wanted check and see if anyone has had this issue before with their
5sfe.
thanks, any info greatly appreciated.

Gairloch · 07-17-2007, 08:06 PM

Is the motor surging all by itself when it's at idle or when you're applying throttle?

Ben · 07-17-2007, 10:45 PM

Using my pics as an avatar? Nice to see those are getting around.....

I like that one a lot.

TreyMR2 · 07-18-2007, 03:09 AM

sounds like a vacum line or something, make sure you got all the sensors and vacum lines are pluged in and unplug the battery then plug it back in to reset the computer. Tell me if it works or not I know some people that might know better than I do but I won't talk to them tell later tomarrow.

twos4yous · 07-20-2007, 09:45 AM

i looked into it further, it appears that the throttle opening valve is causing the problem, i just have not had time to test it. i'm pretty sure i can just apply vaccuum to the diaphram to allow the throttle plate to completely close and then give'er a test drive. I'll try this and post results later tonight.

twos4yous · 07-24-2007, 02:33 AM

i finally figured out the problem the TPS was shot, it had a flat spot just off idle. I put a new tps on the throttle body, and set the resistance. the engine runs great now.

TreyMR2 · 07-24-2007, 02:58 AM

nice. The funny thing is when mine was suring we thought it was the TPS. Then to find out it was just a vacum leak. I don't know why I didn't think of that. Oh well atleast you got it fixed now.

07-17-2007, 06:25 PM	#1 (permalink)
twos4yous toyota skills Join Date: Jul 2007 Location: snohomish WA Posts: 6 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	5S-FE surging at low throttle angle? hi all, I recently picked up a 91 na, Rescued is more like it. I saved the car from previous owner who has posted on this site before, and was attempting to "rice it out" Any ways i have already corrected alot of crappy work that has been done to this veh. I am having a strange problem at very low throttle input, like stop and go traffic, the engine feels like it is surging, or on/off throttle feel. i have already installed new throttle cables, and properly adjusted them. I just wanted check and see if anyone has had this issue before with their 5sfe. thanks, any info greatly appreciated.

07-17-2007, 08:06 PM	#2 (permalink)
Gairloch Dreaming of apexes Join Date: Aug 2005 Location: Minneapolis, MN Posts: 4,472 Thanks: 115 Thanked 223 Times in 196 Posts My Google Map iTrader Rating: (7/100% )	Is the motor surging all by itself when it's at idle or when you're applying throttle? __________________ "Inside the car, the world beyond the driver's immediate horizon ceases to exist. Alone with the solitude of his desire, survival sense numbed by the speed, he's outrun the mediocrity of the outside world, slipped the shackles it tries to clamp on us all. He is running free, chased only by a fear of failure, for failure is to risk ejection into the real world." ~Mark Hughes

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07-17-2007, 10:45 PM	#3 (permalink)
Ben The Fastest MR2 in Reno Join Date: Aug 2006 Location: Oceanside, CA / Reno, NV Posts: 3,404 Thanks: 18 Thanked 240 Times in 227 Posts My Google Map iTrader Rating: (10/100% )	Using my pics as an avatar? Nice to see those are getting around..... I like that one a lot.

07-18-2007, 03:09 AM	#4 (permalink)
TreyMR2 Gen3 swap DONE!! Join Date: Jun 2007 Posts: 1,885 Thanks: 22 Thanked 44 Times in 42 Posts iTrader Rating: (5/100% )	sounds like a vacum line or something, make sure you got all the sensors and vacum lines are pluged in and unplug the battery then plug it back in to reset the computer. Tell me if it works or not I know some people that might know better than I do but I won't talk to them tell later tomarrow.

07-20-2007, 09:45 AM	#5 (permalink)
twos4yous toyota skills Join Date: Jul 2007 Location: snohomish WA Posts: 6 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	i looked into it further, it appears that the throttle opening valve is causing the problem, i just have not had time to test it. i'm pretty sure i can just apply vaccuum to the diaphram to allow the throttle plate to completely close and then give'er a test drive. I'll try this and post results later tonight.

07-24-2007, 02:33 AM	#6 (permalink)
twos4yous toyota skills Join Date: Jul 2007 Location: snohomish WA Posts: 6 Thanks: 0 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	i finally figured out the problem the TPS was shot, it had a flat spot just off idle. I put a new tps on the throttle body, and set the resistance. the engine runs great now.

07-24-2007, 02:58 AM	#7 (permalink)
TreyMR2 Gen3 swap DONE!! Join Date: Jun 2007 Posts: 1,885 Thanks: 22 Thanked 44 Times in 42 Posts iTrader Rating: (5/100% )	nice. The funny thing is when mine was suring we thought it was the TPS. Then to find out it was just a vacum leak. I don't know why I didn't think of that. Oh well atleast you got it fixed now.