Smith-02

okay guys, i know this is more along the lines of a HMT issue than a fullsize pickup is, and its a '85 toyota pickup 4by4. has a stainless flanged 4-1 header, gutted cat, and 2" exhaust from gutted cat back. sounds okay, needs less muffler, i know. but thats not the issue. its the module. i've been through probably 5 or 6 modules out of various years of toyota pickups, and they all wind up dead. i've voltmetered everything that plugs into it, and everthing checks out okay, no spikes or drops. as soon as i got it to run, after i found a gas tank after 4 months because the old one had a huge hole up top, it idled kinda rough (old gas in lines) then got better, and i went to rev it a bit. nothing. died, i let off, it caught, went back to idle. now as soon as id rev it up to like 1700ish, it would act like i was hitting a rev limiter, and the tach would go dead. now i only have one working module, and it's no longer giving me spark at crank. so now im out of anything on this truck. everything spark related (dizzy, plugs, wires, cap, rotor, die elec greased all plug conns, pickup in the dizzy, coil) has been replaced and the engines not running rich/lean or otherwise off for a carburetor (gasp! massive fuel leak!). i'm gonna buy an MSD 6al on monday from summit, and they're only 100 miles away from where i am, but it should be here by tues/weds. is there anything you guys know of to help me with this?


okay, so i've got a msd powering my spark now ( ) and i had to use a ford duraspark II magnetic pickup (toyota OEM has nowhere near the output capable of being read, would still require OEM module, which i didn't have) and now, i've got a butter smooth running CARBURETED 4 banger, which i am now actively looking for a good turbo (something that will boost before 2500ish) and a flange for said turbo

Smith-02

check the crank sensor it could be going bad

it's carbureted, magnetic pickup in dizzy.

.....and buy a atleast a chilton manual so you can check your wiring,

already said i checked wiring

really it could be a bad crank sensor

once again this has no crank sensor

cam sensor

no cam sensor.

or ecu

its carbureted. the only 'computer' is for elec choke and ''emissions'' which dont do anything

you'll just have to trouble shoot the wiring and the sensors.

already checked the wires, and theres no ''sensors'' to play with

Smith-02

i assumed that the word carbutetor and big fuel leak would jump out at you, but i guess they didnt.

Smith-02

big fuel leak = carburetor. according to MerkurColin, at least

JonDouglas

Alright this is a shot in the dark but.... I know you you said that you checked all the wiring with a DVOM, but have you checked th pickup coil out? I know that some times the lead wires on some pickup coils, Chevy, like to break inside the insulation. Make sure that your pickup coil is in spec as far as resistance goes and that it puts out an AC voltage above 100 milivolts and that it increases with engine speed.

Also another odd thing to check is the main power feed for the ignition circuit. Just checking for battery voltage alone on a fairly high current circuit such as this will no suffice. You need to load test the wires to tell if they can handle the load. Those cheap *** test lights that you can get a the parts store usually work well for load testing a circuit like this. Even better is to wire up a spare headlight as a test light to see if the wires can support the needed current draw. Ideally you would perform a voltage drop test at the same time on both the power feed and the ground side of the circuit to ensure that there is not any excess resistance eating up power in the circuit.

As far as anything specific I have no idea because I have absolutely no hands on experience on an old *** Toyota like that.

Good luck man.

Smith-02

really the only thing is thepickup coil in the dizzy, that i question. the leads are like 22ga (wtf?) whereas the old harness was like 18ga. i think im gonna swap the old pickup for the new once i get my msd