New guy need help!

[j owens]

I have 1988 3.0 4wd when starting it miss and if you give any gas it backfires through throttle body for bout 5 sec,then runs ok. After cools down and sits a few hours it does the same thing. This motor has bout 15ooo miles installed bout 1 year ago, this has done since day one.the old motor done same thing hope some one has heard of this.

 

[2ndGenToyotaFan]

Welcome to Mud!!! Glad to have you! If the old engine did it too.... Did you change the distributor with the engine? Or old dist? Sounds like a timing issue.... but odd that it'd clear up when warm....

 

[WristPin]

welcome
check timing first. check grounds and batt connections.

 

[j owens]

Thanks guys for replay. Had a toyota mech. Look at it he said he checked the timing and tryed a different distrbutor and no change,but i have not done it myself. I wish i could get this fixed,i dont drive this truck much because of this.

 

[WristPin]

make sure the distributor is not 180 degrees out

 

[inkpot]

Howdy! This is fuel injected, right? Sounds like the temp sensor is not sending the COLD signal to the computer, so it is running way lean, like no choke on a carbed engine. John

 

[j owens]

Yea its fuel injected .around the end of tail pipe it is black when you give a lot of gas it blow a liitle black smoke, likes its running rich

 

[Jukelemon]

Are you saying that you give it gas when you start it then it backfires or it starts, then misses, you gas it and then it backfires?

Reason I ask...efi does not require gas at start up. If it is not starting when cold without giving it gas, something is wrong.

How old was the last engine? New injectors/cleaned injectors? What exactly was replaced?

A whole slew of things could be going on.

Thanks.

 

[j owens]

The old engine had bout 142000 blew head gasket ran with water in oil done some damange.put a new motor in now bout 15000 on it problem went from old motor to new one. Injectors been cleaned have not been changed different fuel rail, new air duct from air cleaner new plugs and wires when motor was changed, changed o2 sensor 2000 miles ago still have same prob and no error codes. I give it no gas when starting when starts it misses and if you try to give it gas it backfires through throttle body once it clears out runs perety good . Could this be a sensor problem mass air flow etc.

 

[Hilux]

what's the codes?

and could a cam be a tooth off?

 

[j owens]

Dont have any error codes says everything ok but i no i got something wrong just not sure wht it is

 

[2ndGenToyotaFan]

The V6 is really easy to get the valve timing off a tooth.... That could be it..... It's a pain to check though.

 

[Jukelemon]

He said it was a newer engine i.e. I am ssuming it should have been set up right i.e. I highly doubt the probability of having two engines timed wrong.

It has to be something that was transferred from one engine to the other in my opinion.

WHAT, having to do with ignition, was used for both engines?

Perhaps the distributor is bad and was bad from the old engine?