so here's the story. my dad's 95 extended cab 4 wheel drive toyota engine gave out at about 440,000 miles. ironically, a year earlier my cousin went all out with a rebuild and new head with nice upgrades to it in his 92 4 wheel drive toyota and around the same time that my dad's engine blew up, my cousin decided to scrap his truck due to rust so he gave the rebuilt engine to my dad and i installed it in my dad's 95 pickup. the rebuilt engine had real nice power in my cousin's 92 pickup but has a great deal less power in my dad's 95 pickup. i kept pretty much all the 95 electronics in the truck and just put them on the new engine.

any idea's what would cause such a huge power loss in an engine just by moving it to a different engine bay?

 

did the power loss occur exactly at the swap?
Most likely from gearing from the whole new vehicle setup.
Different years and trucks had different gearing, ratio's and tire size.

I would take a look at all the electronics, such as the VAFM, clean the intake system, the injectors, and the o2 sensor. There's alot to look at, should be simple.

Give that a shot, and come back, we'll be glad to help.

Btw, check all ground wires, they are a pain, but eventually if you find an open one, there you go!

Also, any leaks in the intake system after the VAFM will cause major weakness.

 

yes, the power loss was that quick. excellent power in the 92 truck and as soon as it wa sput in the 95 and started up it had half the power. both trucks were 4 wheel drives and the 95 is now running the same exact aftermarket wheels and tires that the 92 had on it at the time... we used his wheels also since he had no need for them anymore

a little more history... the 95 truck had gone in for an oil change at the dealer back in 95-96 when it was less than a year old. dealer either forgot to put drain plug back in or didnt refill with oil which resulted in engine failure a few miles down the road so they covered a "new" engine. truck was always extremely underpowered (yes, even for a 22re). when pulling that engine out i realized that it had the dual timing chain and longer timing cover (longer block). after some research i found that the dealer installed a pre 85 engine back in 95-96.

not sure if any of that helps or not but maybe they had to make a change back then to backdate the engine which has always caused this huge power loss

also, lately my dad has been telling me that 4,000 rpm's is all he can push out of it when going up steep hills...

thanks so far guys

 

how did the old engine die?


if it was smoking a lot it could of clogged the cat.

 

it died from a lot of miles. had 440,000 on the odometer so it was just wore out. it did smoke for a while then it suddenly started blowing oil everywhere (rust prevention!) and lost all it's power and would hardly run.

i just might have to put the cat on the top of the list of things to check

 

ok, i changed some parts we had extra's of laying around. changed knock sensor, coil, distributor, new wires (needed them anyway) and checked the cat which is flowing just fine. still have the power loss...

this brings me to my next direction

the oil pressure gauge on the dash is not working now after putting the new engine in. problem isnt the sensor because i changed it and i put an aftermarket gauge on for a few minutes just make sure there really was oil pressure and there was.

also, the speedometer doesnt work. hasnt for a couple years now. so my question is, does the speed sensor relay speed info to the ECU which the ECU isnt seeing to cause this power loss?

 

Tuning????????????????????????