N/A problems

airbornesquelch · 04-24-2007, 05:48 PM

I have 91' N/A the stock 5sfe took a crap on me and I purchased a 3sfe, and it arrived with nothing on it, so I installed most of the parts from my old engine with no real problems, but now it's up and running and it drives wierd. If I accelerate from a stop, WOT it's sluggish, and wont rev past 5 grand, but if I hold it half throtle, it goes like a raped ape and will red line no problem. I've been working on cars for a really long time, this is the first time i've ever dealt with this. I really need some help!!!

Mister2.2 · 04-24-2007, 06:35 PM

Hrrm TPS maybe?

airbornesquelch · 04-24-2007, 07:07 PM

wouldn't my throttle not work? how is the tps giving more signal half way through the travel?

bigshoguns · 04-24-2007, 07:35 PM

amm.. 3sfe and 5sfe are not the same, ECU issues most likely.

mr2greasemonkey · 04-24-2007, 08:39 PM

5s and 3s arent the same...what did you swap over?

mrturrari · 04-25-2007, 02:37 AM

First check you timing and look for vacuum leaks.

The 3sfe is a smaller, lower power version of a 5sfe but your problems sound like more then would be caused by that. I test drove a 3sfe MR2 a few years back and it drove like any other economy, underpowered, you're in no big hurry, passenger car. Mr2's with 3sfe's in them make me want to cry.

airbornesquelch · 04-25-2007, 07:38 AM

I forgot to mention that I bored the cylinders to fit bigger wisco pistons, and the head is off my 5sfe and it has been ported and polished, I dont think that the over bore is my problem though, I'm planning a turbo, nitrous and a front mount intercooler

I swapped over the intake, exhast, and mounts, plus all of the sensors and harness, they mate purfectly to their original head.

04-24-2007, 05:48 PM	#1 (permalink)
airbornesquelch panda on a leash Join Date: Apr 2007 Location: Gig Harbor Posts: 63 Thanks: 4 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	N/A problems I have 91' N/A the stock 5sfe took a crap on me and I purchased a 3sfe, and it arrived with nothing on it, so I installed most of the parts from my old engine with no real problems, but now it's up and running and it drives wierd. If I accelerate from a stop, WOT it's sluggish, and wont rev past 5 grand, but if I hold it half throtle, it goes like a raped ape and will red line no problem. I've been working on cars for a really long time, this is the first time i've ever dealt with this. I really need some help!!!

04-24-2007, 06:35 PM	#2 (permalink)
Mister2.2 Cheese it! Join Date: Feb 2005 Posts: 6,561 Thanks: 121 Thanked 115 Times in 99 Posts Blog Entries: 1 My Google Map iTrader Rating: (3/100% )	Hrrm TPS maybe? __________________ --Josh MR2Trader.com Free to Buy and Sell your MR2 Parts!

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04-24-2007, 07:07 PM	#3 (permalink)
airbornesquelch panda on a leash Join Date: Apr 2007 Location: Gig Harbor Posts: 63 Thanks: 4 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	wouldn't my throttle not work? how is the tps giving more signal half way through the travel?

04-24-2007, 07:35 PM	#4 (permalink)
bigshoguns my two yours 0 Join Date: Mar 2006 Location: North NJ Posts: 158 Thanks: 5 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	amm.. 3sfe and 5sfe are not the same, ECU issues most likely.

04-24-2007, 08:39 PM	#5 (permalink)
mr2greasemonkey Once again....yups Join Date: Sep 2005 Location: Portland, OR Posts: 1,658 Thanks: 4 Thanked 63 Times in 42 Posts iTrader Rating: (0/0% )	5s and 3s arent the same...what did you swap over?

04-25-2007, 02:37 AM	#6 (permalink)
mrturrari I <3 my 5sfe Join Date: Mar 2005 Location: Salt Lake City, Utah Posts: 655 Thanks: 2 Thanked 170 Times in 113 Posts iTrader Rating: (0/0% )	First check you timing and look for vacuum leaks. The 3sfe is a smaller, lower power version of a 5sfe but your problems sound like more then would be caused by that. I test drove a 3sfe MR2 a few years back and it drove like any other economy, underpowered, you're in no big hurry, passenger car. Mr2's with 3sfe's in them make me want to cry.

04-25-2007, 07:38 AM	#7 (permalink)
airbornesquelch panda on a leash Join Date: Apr 2007 Location: Gig Harbor Posts: 63 Thanks: 4 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	I forgot to mention that I bored the cylinders to fit bigger wisco pistons, and the head is off my 5sfe and it has been ported and polished, I dont think that the over bore is my problem though, I'm planning a turbo, nitrous and a front mount intercooler I swapped over the intake, exhast, and mounts, plus all of the sensors and harness, they mate purfectly to their original head.