rawfeels

i have a freshly rebuilt 3vze in my truck. tires are 31x10.5x15 BFG A/Ts (were...i have to figure out a new set because i had a blow out).

anyway...i figured before my engine was rebuilt that it was just old and slow to accelerate. Also i've read over this forum and found that the motor is "slow" in general but surely they cant be this bad.

the problem is that on flat ground, i can MAYBE hit 60. on the freeway, going DOWNHILL...i can probably hit 75. going up any kind of incline it wont go past 55.

my rpm when the thing is floored going flat or uphill is at about 2.5 in 5th gear so theres nothing else i can do. Is there something else i should be checking? no codes or anything...

could it be some kind of sensor like the TPS thats limiting my enigne. it just feels...asthmatic. like if it really wants to go, but cant. like something is holding it back. doesnt sputter or anything though.

i dont want to be "that guy". frankly in california it can be pretty dangerous driving at say 3am in the dark on the freeway going 55mph while everyone else is going 85

BigSwole

is the exhaust clear? cat stopped up maybe?

dcole

have you checked your timing?

TNRabbit

May be one or a combo of things. I suggest reading the EPIC 3VZE thread linked in my sig line.

Start by pulling ECU codes.
TPS adjusted & working properly?
Sounds a lot like a Knock Sensor issue, but that should give you a CEL.
How's your fuel pressure?

bjlambert

Changed your air filter lately? Install a cold air filter if possible, it'll give you twice the air you need. Then, see like BigSwole said and check your exhaust. Tear out any unneeded stuff (Cat) and it should improve.

TNRabbit

At what cost?

The "cold air" intakes are a huge scam. They introduce "hot" air from inside the engine bay & most of the filters let 3x more dirt in the engine....

rawfeels

the air filter was changed within the last few thousand miles so thats good. i also cleaned out and replaced all the ducts leading from the air filter to the throttle body at the same time i cleaned out the throttle body itself and threw some seafoam in there.

as far as the timing, that was set by the engine rebuilder guy to stock specs. i think thats ok though as it doesnt seem to sputter.

i think first thing that came to mind to fix is the exhaust. it looks pretty beat and old and full of crap welds. i have no idea about the cat being clogged but i could see that being the case. i ripped all the EGR stuff out so perhaps ill just get a new exhaust pipe run and remove the cat altogether and see if that helps any.

meanwhile i will read that EPIC thread and see if i find any ideas in there and read the FSM on how to check TPS.

thanks

live4soccer7

As I've read, they aren't too much better than the 22r's. If that is the case then that sounds about right.

BMcEL

Uh, downshift?

My veezy will cruise comfortably at 75-80mph (in 5th) on the freeway all day long. If maintenance is current, cam & ignition timing is correct, and you aren't getting any codes, it probably has something to do with the way you drive it. The 3vz likes to spin...I take mine above 4500rpms daily.

The people saying that are the ones that haven't kept up on maintenance (or bought one that was poorly maintained). A well maintained stock 3vz will blow a well maintained stock 22r out of the water every time, hands down. Doesn't matter if you love or hate the 3vz, it's the simple truth.

rawfeels

perhaps. all i know is it wont downshift at >2.5k easily. generally i upshift at 3-3.5k after that point it generally just tops off on power. both the old engine and the rebuilt one.

BMcEL

I take it it's an auto then. Turning ECT on will make it downshift sooner, and you can still manually control the auto...click OD off to drop from 4th to 3rd, shift to '2' to drop from 3rd to 2nd, and 'L' to drop from 2nd to 1st. If you haven't tested the TPS yet, do it.

With stock timing, power doesn't really kick in until about 3000rpms. I would start by advancing the ignition timing to 12-15 degrees (as long as it doesn't ping) and force it to keep the rpms up a little by using ECT or manually shifting it.

Edit - the auto is a 4spd BTW.

runs-on-4

iTrader: (1)

i got 410s and 35s my 3vze will out preform my 22r with 31s all day, i have no problem hitting 80 in 5th, sounds like you need a simple tune up

scope103

And you're sure he set it correctly? (And that it stayed that way?) Your engine will produce very little power long before it will sputter if the timing is retarded. If you're willing to consider all the other (mostly excellent) advice on this forum, surely you can spring for $20 (or less) for a tool you'll use regularly. http://www.harborfreight.com/xenon-t...ight-3343.html Checking the timing is so easy it's almost the first thing you should do for any problem.

idanity

my 88 3vz-e (is the winabego eng)
hits 60 @ 3k rpm in 4th
hits 70 @ 3k rpm in 5th

never topped it out, but ive done over 80+ in stretches on flats,

on a sidenote, (and a bit of a threadjack, but still on topic) my engine feels like its happiest around 3k, and i rarely bring it to 4k, let alone 5-6k where it redlines.....
? do you keep the revs below 3k ?
the higher the revs, (usually) the more power you'll be feeling