Topic: important efi information!!!

[crawlerdan]

ok every body, you may or may not have heard that i have been having serious issues with my 22re not running correctly and have spent countless dollars replacing parts that actually did not need to be replaced.
i happen to be related to one of the engineers that helped design 2nd gen trucks and supras ect.
and i had him over at the house yesterday and he informed me that these trucks have problems in the wiring harness that spans from the cab on the drivers side to the ignitor, mass air flow ect, in to the engine bay. seems as though this section of harness is more prone to corrosion than any other parts. sure enough, i removed it and all the tape and there where 6 wires that where badly damaged, the o2 sensor was broken all the way(wire) and the main power supply wire was only holding on by 2 strands of wire, instead of 30 or something.
i reconected all damaged wire and put heat shrink over tham, and wala, the truck runs better now than it ever has, is quieter, smoother, more powereful, and idles at 650 with no shaking as it did before. so--- if you have efi related problems, first thing to do is start shaking harnesses and connectors. toyota says that nearly 3/4 of the efi problems in trucks of this age (80s) can be traced to faulty wires, coroded connections, or poor connections.

hope this helps all in the marlin world --crawlerdan

[crawlerdan [OP]]

  ill look at the intake side of the harness next if i have to but lets hope that this solved the problems!!

[Tice]

Thats some good info Dan. Mine is/has been running wierd every since I did the efi conv. Sometimes it won't start with the relay in and I have to remove a fuse and stick it back in to get it to start. And it has always had a miss at idle. I'm gonna check the wiring tommorow after dinner!!

[kneedownnate]

I sure hope this is only an issue with the first efi setups, not 89 and newer. 

[toyfamily]

Did you remove the harness on the driver side and if so how difficult was it to remove?

[crawlerdan [OP]]

I sure hope this is only an issue with the first efi setups, not 89 and newer. 

didnt say, but this is always usefull info!!

[crawlerdan [OP]]

Did you remove the harness on the driver side and if so how difficult was it to remove?

i pulled it out and layed it on the tire to work with, whole process took me 2 hours start to test drive!! sooooooooooo worth it

[crawlerdan [OP]]

Thats some good info Dan. Mine is/has been running wierd every since I did the efi conv. Sometimes it won't start with the relay in and I have to remove a fuse and stick it back in to get it to start. And it has always had a miss at idle. I'm gonna check the wiring tommorow after dinner!!

hope you find something that helps out bro--goodluck, happy baby Jesus day--dan

[Trunkz]

anyone have any pics of where to look for the power supply wire?
got an 87 that this may be an issue with
thanks
Mike

[crawlerdan [OP]]

anyone have any pics of where to look for the power supply wire?
got an 87 that this may be an issue with
thanks
Mike

look at the loom that is in the drivers front fenderwell, that goes to the mass airflow meter and coil..ect

[eightyfive]

PICTURES!!!!!! please?

[crawlerdan [OP]]

PICTURES!!!!!! please?

i donthave pics, but ther is only 1 loom in the drivers fender well, like under neath, by the tire, inbetween the plastic fender liner and inner fender


in there where the arrow points

[reklund5]

I've also seen the harness rub on the fuel rail on the intake side of the engine, and rub thru the loom, thru the insulation, and let the injector wires/coolant temp sensor wire/etc ground out on the fuel rail.  I've taken to installing a piece of heater hose over that section of fuel rail and making sure the wire loom is in good condition.

Ryan

[dentedfender]

Just found this post, and i think it may be a problem with mine as well.

[crawlerdan [OP]]

like i said 2 years ago, if you are having problems with efi stuff, shake connectors near sensors, check grounds, and check for coroded wires