msc_1986

I have an 88 pick up with the v6. On a rainy day it drove fine to my work and when I left work it idled fine then when I tried driving down the street it was sputtering really bad wouldn't go more that maybe 15 mph. About 10 min later it started running fine again. Got it home shut it down started up wouldn't idle right try giving it has and it seemed like it wanted to choke out. I changed the ecu, mass air flow sensor, and fuel filter still no changes it idles fine and revs fine out of gear once your in gear and start moving it starts sputtering and wants to choke out but doesn't stall. Everything is dry. And it only does it at a certain rpm I'd have to guess maybe 2k and sometimes while I'm driving itll go to around 2500 rpm and then kinda hold it's rpm and very slowly start moving past it. And I mean very slowly even at full throttle. Any suggestions on what to check?

muddy chevota

i would make sure your fuel pump is pumping well, check the connections to it, see what kinda pressure it has on fuel rail, air filter plugged?? prob not , check your distributor for dampness/timing maybe it has jumped or got moisture in it somehow, you said it was a rainy day, not that it should get moisture in it but worth a shot, maybe a plug wire came off or is wet??

muddy chevota

smell your exhaust when idling see if it is over fueling,

msc_1986

exhaust smells normal its not over fueling. sometimes the truck all of sudden starts running fine with full power then when i shut it down and re start later it runs like crap again. Everything in motor is dry anything electrical has die-electric grease on it. air filter is new. i gotta check on the pressure just in case. Thanks.

msc_1986

no wires are loose. the sputtering it does isn't the type like when you have a misfire.

muddy chevota

u might have to ask someone else but maybe the TPS throttle positioning sensor is messing up, im guessing at this one

msc_1986

ive had other toyota's that the TPS messed up on but it triggered the check engine light. But I also thought the same thing. I have a spare one laying around somewhere something I will try

93toyrunner2

Do you have a water leak in the front passenger side behind the kick panel leaking onto the COR / ECM area?

msc_1986

I did before thats when all the problems started. I took that ECU out and put another one I had from a different 88 and it didnt solve anything all the same problems still occurred. I have also re-located the ECU to next to the blower behind the glove box.

93toyrunner2

What about your COR that is mounted above where the ECM used to be?

msc_1986

I'd have to see. whats that look like? I never knew there was something else in that area

93toyrunner2

It is mounted above the ECM location, and is probably the problem. Use the link in my signature to go to the FSM and look up how to test it once you have it pulled out.

msc_1986

Thanks alot for the help ill check it out. What does this control?

93toyrunner2

msc_1986

I looked where I had the ECU and did not see any relay. Is it possible it is located else where depending on the yr truck?

93toyrunner2

It is usually about 6 -8 inches above where the ECM mounts to the passenger side behind the kick panel. It is mounted into a recess area, and is hard to tell what it is until you get it out of the recessed area. It has 1 10mm bolt holding it into the sheet metal. Look up as far as you can put your hand in that area, until you hit the dash panel. It is right there.
Turn your ignition key to the on position, and have someone open the MAF flap, while you listen for the click of the COR, to help identify where it is.

msc_1986

Thanks I'll take a look. just blew a brake line gotta fix that too

msc_1986

I did find it. so how do you check if its good or not? I tried downloading the FSM but wont let me

93toyrunner2

http://www.ncttora.com/FSM/1990-1995...e/circuito.pdf