proja123

I have a 89 Toyota that had a 3 liter v 6 with 285000 miles head gasket went and I swapped a 22 re motor tranny and interior and exterior wiring out of a wrecked truck and now it runs great but randomly won't start has fuel spark doesn't make sense the only thing that I have found odd is the efi relay is hot eventually it starts just would like to figure out why the relay would get hot unless they do that when they go out ?

bipolarandproud

They do get hot .I bought a new one and it got hot too . I had asked that same question on here awhile back .
Try this though , When the truck doesn't want to start wiggle/tap the efi relay
while your starting the engine . The connections may be back in the relay .

proja123

Ok thanks I will try that I have feeling the computer is the issue but not positive the code it brought up was 51 and there isn't any ac stuff so maybe the tps

bipolarandproud

Code 52 is the knock sensor . It's located under hood, passenger side, upper engine area, below center of intake manifold, mounted in engine block . First make sure it is plugged in . Don't confuse it with the oil pressure switch ,which its below the oil filter mounted in engine block .

proja123

It was code 51 it says tps,ac, and ecu

proja123

It was code 51 it says tps,ac, and ecu

bipolarandproud

Aww!! I see . Sorry about that , I thought you said 52.

proja123

I found another ecu in a wrecking yard and am makin the two hour drive right now

bipolarandproud

Okay , I hope you can figure it out , If you had any new problems or anything keep me posted .

proja123

Hey thanks for the info do you know when the ecu acts up can it be intermittent? I am wondering if when the donor truck I pulled everything out of got into the wreck maybe it has some internal damage

bipolarandproud

It is possible that the ecu could have been damaged / maybe it got wet.

proja123

It's just so random it ran no worries for three days then same thing again anyhow thanks again and will let you know if anything changes

hilandfrog

LOTS of water damaged cars/ and trucks out there....

Repo

proja123

Well shut it off at the wrecking yard and no start with the other computer or a different coil and igniter they only gave half $ back on the ecu ...... kinda at a loss I put my computer back In and when I put the gas pedal all the way to the floor it finally started but blew a cloud like it was flooded